CN102570280B - Blue, green and ultraviolet solid laser device based on submarine communication application and laser generating method thereof - Google Patents

Abstract

A blue, green, ultraviolet solid-state laser device and its laser generation method based on latent communication applications, in order to solve the problem that the current blue-green light waves emitted by laser diodes or semiconductor pumps have a small range of wavelength bands and too low power , It is not designed to fully meet the technical problems such as detection requirements in marine communications. The present invention uses Nd ³⁺ doped laser crystal as the working material, uses polarization beam splitter prism and right-angle reflective prism to make fundamental frequency light with different wavelengths and different polarization directions form stable oscillations in independent resonant cavities, and at the same time, it is compatible with non- The combination of linear sum frequency and frequency doubling technology realizes the simultaneous output of blue, green and ultraviolet lasers. The invention makes full use of the energy of the fundamental frequency light, has the characteristics of high conversion efficiency, compact structure, low operating cost, flexible and convenient adjustment, safe work, wide application, etc., and is especially suitable for the fields of underwater detection and underwater communication.

Description

Blue, green, ultraviolet solid-state laser device and laser generation method based on latent communication application

technical field

The present invention relates to a laser device, in particular to a solid-state laser device capable of simultaneously outputting three-wavelength blue, green, and ultraviolet lasers based on all-solid-state 0.5um band range green light, 0.4um band range blue light and 0.2um band range ultraviolet light based on latent communication applications and Its laser generation method.

Background technique

Since the birth of the world's first ruby laser in 1960, various lasers and laser technologies have developed extremely rapidly. Among them, the development of multi-wavelength lasers has attracted much attention. Because it overcomes the defect of traditional lasers outputting a single wavelength, it is widely used in laser medicine, Laser color display, laser full-color film, atmospheric monitoring and scientific experiments occupy an important position, and have theoretical research value and application value. There are related reports at home and abroad that use nonlinear optical crystals to convert laser frequency to obtain multi-wavelength laser , but so far, most of the reports on multi-wavelength laser devices have focused on applications in the fields of medicine, display and demonstration, such as using an all-solid-state mode-locked laser and a fiber laser to provide fundamental frequency light through the cavity External frequency doubling and sum frequency output red, green and blue primary color lasers at the same time (US.Patent, Pub.No.: US2001/0010698A1, RGB Laser Radiation Source); a PPKTP crystal is used in the Chinese patent (publication number: 1411113A) The simultaneous output of red, yellow and blue three-wavelength lasers is realized. As for the application of laser underwater detection and underwater communication, there are few reports on multi-wavelength laser devices and applications. Laser detection technology has important application value in the fields of underwater target search, marine geological exploration, target recognition, etc. When people study the propagation characteristics of light waves in the ocean, they find that the seawater is sensitive to the blue-green laser in the 0.4-0.5um band. The attenuation is much smaller than for other bands, thus confirming the existence of an ideal light-transmitting window in seawater. The discovery of this physical phenomenon makes laser underwater detection possible. At present, in the Chinese patent (ZL patent number: 90100168.6), the 980-1000nm beam emitted by the laser diode is frequency-multiplied by the KTP crystal to generate a 490-500nm blue-green laser. need. The blue-green laser intravascular irradiation therapy instrument mentioned in the Chinese patent (ZL patent number: 95106927.6) adopts semiconductor-pumped blue light of 410nm and green light of 532nm, and the power varies between 5-200mW. Because the power is too low, only It is suitable for the treatment of certain medical diseases. In addition, in marine communication, the existence of algae in some places will affect the communication effect and is not conducive to information transmission. Therefore, in the same laser device, the blue-green laser is used for underwater detection, and the ultraviolet laser is used for algae removal when necessary. , to ensure the smooth progress of latent communication, but the comprehensive application of this aspect has not been reported yet. Therefore, according to the actual needs and the development status of the latent communication laser device, the development and design of the blue, green and ultraviolet three-wavelength laser has important practical application value.

Contents of the invention

In order to solve the technical problems of blue-green light waves emitted by laser diodes or semiconductor pumps at present, the existence of different degrees of band range is small, the power is too low, and cannot fully meet the detection requirements in marine communications, etc., and the present invention provides a submarine-based A blue, green, and ultraviolet solid-state laser device for communication applications and a laser generating method thereof.

The laser device is a blue, green and ultraviolet solid-state laser device based on latent communication applications. It uses a laser crystal doped with Nd ³⁺ as a working material, and uses a polarization beam splitter and a right-angle reflective prism to make lasers with different wavelengths and different polarization directions The fundamental frequency light forms stable oscillations in their independent resonant cavities. At the same time, it is combined with nonlinear sum frequency and frequency doubling technology to realize simultaneous output of blue, green and ultraviolet lasers, making full use of the energy of the fundamental frequency light. It is a solid-state laser device with high conversion efficiency, compact structure, low operating cost, flexible and convenient adjustment, safe work, and wide range of simultaneous output of blue, green, and ultraviolet.

The device includes double rods connecting the first laser crystal doped with Nd ³⁺ and the second laser crystal doped with Nd ³⁺ in series, and the double rods connecting the first laser crystal doped with Nd ³⁺ and the second laser crystal doped with Nd ³ in series ⁺ The vertical optical path of the laser crystal is sequentially provided with the first 45° reflector, the first doped Nd ³⁺ laser crystal and its pumping source, the second doped Nd 3+ laser crystal and its pumping source, the second doped Nd ³⁺ laser crystal and its pumping source, Two 45 ° reflectors, polarizing beam splitters, the first frequency doubling crystal, the first plane reflector, the second frequency doubling crystal, the third 45 ° reflector; the horizontal optical path perpendicular to the vertical optical path faces the first One side of the 45 ° reflector is provided with the first harmonic reflector, the third frequency doubling crystal and the first coupling output mirror in turn; the side facing the second 45 ° reflector is set in sequence on the horizontal optical path perpendicular to the vertical optical path There is a second harmonic reflector, a fourth frequency doubling crystal, a first sum frequency crystal and a second coupling output mirror; the side facing the third 45° reflector on the horizontal optical path perpendicular to the vertical optical path is sequentially provided with the first Three harmonic reflectors, the second sum frequency crystal and the third coupling output mirror; the other side of the third 45 ° reflector on the optical path perpendicular to the horizontal optical path is placed with a right-angle reflector prism; wherein:

The side of the first 45° reflector close to the first laser crystal doped with Nd ³⁺ is coated with a high-reflection film (reflectivity R>99.8%) of fundamental frequency light in the range of 1.0um and 1.3um;

The side of the second 45° reflector close to the second laser crystal doped with Nd ³⁺ is coated with a 1.3um band range fundamental frequency optical high-reflection film (reflectivity R>99.8%) and a 1.0um band range fundamental frequency optical amplifier. Transparent film (transmittance T>99.8%), the other side is coated with 1.0um band range fundamental frequency light AR coating (transmittance T>99.8%);

Both sides of the third 45° reflector are coated with a high-transmittance film for fundamental frequency light in the 1.0um band range (transmittance T>99.8%), and the side close to the second frequency doubling crystal is also coated with a high-transmittance film for ultraviolet light in the band range of 0.2um. Reflective film (reflectivity R>99.8%);

Both sides of the first plane reflector are coated with a 0.5um band range frequency doubling light anti-reflection film (transmittance T>99.8%), and the side close to the first frequency doubling crystal is also coated with a 1.0um band range fundamental frequency light height Reflective film (reflectivity R>99.8%);

The side of the polarizing beam splitter close to the second 45° mirror is coated with a 1.0um band range 's' polarized and 'p' polarized fundamental frequency light anti-reflection coating (transmittance T>99.8%), close to the first times One side of the frequency crystal is coated with a 1.0um band range 's' polarized light anti-reflection coating (transmittance T>99.8%), and the side close to the right-angle reflective prism is coated with a 1.0um band range 'p' polarized light anti-reflection coating (transmission Pass rate T>99.8%).

The two optical surfaces of the first harmonic reflector are coated with 1.3um and 1.0um fundamental frequency anti-reflection coatings (transmittance T>99.8%), and the side close to the third frequency doubling crystal is also coated with 0.5 High-reflection coating for frequency doubling light in the um band range (reflectivity R>99.8%); both optical surfaces of the second harmonic mirror are coated with 1.3um band range fundamental frequency light anti-reflection coating (transmittance T>99.8%) , the side close to the fourth frequency doubling crystal is also coated with a high-reflection coating of frequency doubling light in the 0.6um band range (reflectivity R>99.8%); both optical surfaces of the third harmonic mirror are coated with fundamental frequency in the 1.0um band range Light and 0.2um band range frequency doubled light anti-reflection coating (transmittance T>99.8%), and the side close to the second sum frequency crystal is also coated with 0.2um band range and frequency light high reflection film (reflection rate R>99.8% ).

The side of the first coupling output mirror close to the third frequency-doubling crystal is coated with a high-reflection film for fundamental-frequency light in the 1.3um and 1.0um band ranges (reflectivity R>99.8%) and a high-transparency film for frequency-doubling light in the 0.5-band range; The side of the second coupling output mirror close to the first sum-frequency crystal is coated with a high-reflection film for fundamental frequency light in the 1.3um band range and frequency-doubling light in the 0.6um band range (reflectivity R>99.8%) and a high-transparency film in the 0.4-band range and frequency range. ; The side of the third coupling output mirror close to the second sum frequency crystal is coated with a high-reflection film (reflectivity R>99.8%) of 1.0um band range fundamental frequency light and 0.2um band range frequency multiplier light and a 0.2 band range sum frequency light height Transmembrane (transmittance T>99.8%).

The surface of the right-angle reflective prism 22a1 is coated with a 1.0um waveband range 'p' polarized light anti-reflection coating (transmittance T>99.8%) and is perpendicular to the first laser crystal doped with Nd ³⁺ and the second doped Nd The plane formed by the vertical optical path of the ³⁺ laser crystal and the horizontal optical path perpendicular to the vertical optical path, the right-angle reflective prism 22a2 surface and a3 surface are coated with a high-reflection film of 'p' polarized light in the 1.0um band range (reflectivity R> 99.8%) and the two planes are perpendicular to each other.

The laser generation method of the blue, green and ultraviolet solid-state laser device based on latent communication application is carried out according to the following steps:

1) After the first laser crystal doped with Nd ³⁺ and the second laser crystal doped with Nd ³⁺ respectively absorb the energy radiated by the first pump source on the side and the second pump source on the side, an inverted particle number distribution is formed, Nd ³⁺ transitions between the energy levels ⁴ F _3/2 - ⁴ I _11/2 and ⁴ F _3/2 - ⁴ I _13/2 respectively, producing stimulated fluorescence radiation in the 1.0um and 1.3um band ranges, the radiated Fluorescence will oscillate and amplify in their corresponding laser resonators to form stable fundamental-frequency oscillating light, in which the fundamental-frequency light in the 1.0um band range emitted vertically upward by two Nd ³⁺ -doped laser crystals passes through the first After being reflected by the 45° reflector, the first harmonic reflector is incident on the third frequency-doubling crystal, and the frequency of the third frequency-doubling crystal is doubled to generate green light in the 0.5um band range, which is basically the same as the unconverted 1.0um band range The frequency light reaches the first coupling output mirror together, and the fundamental frequency light in the 1.0um band range is reflected and then passes through the third frequency doubling crystal to generate frequency doubling green light, and the frequency doubling green light generated by the third frequency doubling crystal twice is passed by the first frequency doubling crystal After being reflected by the harmonic reflector, it is output horizontally outside the cavity through the first coupling output mirror, and the remaining fundamental frequency light in the 1.0um band range after twice frequency doubling returns along the original path to the first laser crystal doped with Nd ³⁺ , the second After the two-doped Nd ³⁺ laser crystal, together with the fundamental frequency light in the 1.0um band range generated vertically downward, it reaches the polarization beam splitter through the second 45° mirror, and the polarization beam splitter divides it into two paths, namely Vertically passed 's' polarized and horizontally reflected 'p' polarized 1.0um band range fundamental frequency light, wherein the first vertically passed 's' polarized 1.0um band range fundamental frequency light is frequency doubled by the first frequency doubling crystal After the green light in the 0.5um band range is generated, it is reflected by the first plane mirror and then passes through the first frequency doubling crystal. The green light generated twice is output to the second frequency doubling crystal through the first plane mirror, and the remaining 's' polarization is 1.0 The fundamental frequency light in the um band range is returned to the first outcoupling mirror in the original path, and stable oscillation and optical amplification and frequency-doubled green light are generated and output between the first outcoupling mirror and the first plane mirror;

2) The 1.0um waveband range 'p' polarized fundamental frequency light reflected by the polarization beam splitter in the horizontal direction is incident on the a1 surface of the vertical right-angle reflective prism to the a2 surface, after being reflected twice by the a2 surface and a3 surface, it is output through the a1 surface in the horizontal direction Reach the third 45° reflector;

3) The green light in the 0.5um band range output by the first plane reflector described in step 1) is frequency-multiplied by the second frequency doubling crystal to generate ultraviolet light in the 0.26um band range, and the ultraviolet light in the band range is reflected by the third 45° After mirror reflection, together with the 1.0um polarized fundamental frequency light that reaches the third 45° reflector in step 2), it passes through the third harmonic reflector and reaches the second sum frequency crystal. After the sum frequency action, the remaining 1.0 The 'p' polarized fundamental frequency light in the um band range and the ultraviolet light in the 0.26um band range pass through the second sum frequency crystal again, and the 0.21um band ultraviolet laser light generated after the two sum frequency actions is reflected by the third harmonic reflector and then emitted by the third The outcoupling mirror is horizontally output out of the cavity, and the remaining 1.0um band range 'p' polarized fundamental frequency light returns to the first outcoupling mirror along the original path, forming a stable oscillation and light between the first outcoupling mirror and the third outcoupling mirror Amplify and generate UV laser output in 0.21um band with 0.26um band ultraviolet light;

4) In step 1), the fundamental frequency light in the 1.3um band range emitted vertically upward by two Nd ^- doped laser crystals passes through the first 45° reflector, the first harmonic reflector and the third frequency doubling crystal Incident to the first coupling output mirror, after reflection, return along the original path and the fundamental frequency light in the 1.3um band range emitted vertically downward by the two Nd ³⁺ -doped laser crystals is reflected by the second 45° reflector together, and passes through the first The second harmonic reflector reaches the fourth frequency doubling crystal to generate red light in the 0.6um band range, and the red light in the 0.6um band range emitted by the left end face of the fourth frequency doubling crystal is reflected by the second harmonic reflector and is the same as the 0.6um red light emitted by the right end face The red light in the band range and the fundamental frequency light in the remaining 1.3um band range pass through the first sum frequency crystal to generate blue light in the 0.4um band range, which is output outside the cavity horizontally by the second coupling output mirror, and the remaining unconverted fundamental frequency in the 1.3um band range The frequency light and the red light in the 0.6um band range return along the original path, the fundamental frequency light in the 1.3um band range forms a stable oscillation between the first coupling output mirror and the second coupling output mirror, and the red light in the 0.6um band range is in the second harmonic A stable oscillation is formed between the wave reflector and the second outcoupling mirror.

Features and beneficial effects of the present invention: due to the use of double-rod Nd ³⁺ laser crystals to provide dual-wavelength fundamental frequency light in the 1.0um and 1.3um band ranges, and the use of intracavity frequency doubling and sum frequency technology and the use of polarization beam splitters and right-angle reflection The prism controls the fundamental frequency light in different polarization states, and fully utilizes the energy of the fundamental frequency light. It has the characteristics of novel structure, high conversion efficiency, compact structure, low operating cost, flexible and convenient adjustment, safe work, and wide application. It is used in the fields of underwater detection and underwater submersible communication.

Description of drawings

Fig. 1 is the structure schematic diagram of the solid-state laser device of blue, green, ultraviolet three-wavelength laser output simultaneously in the present invention;

Detailed ways

Accompanying drawing 1 is an embodiment of the present invention.

The content of the present invention will be described in further detail below in conjunction with the accompanying drawings.

Referring to Figure 1, the blue, green, and ultraviolet solid-state laser devices based on latent communication applications include double rods connected in series with the first laser crystal 1 doped with Nd ³⁺ and the second laser crystal 2 doped with Nd ³⁺ , and the double rods are connected in series The laser crystal 1 of the first doping Nd ³⁺ and the vertical optical path of the laser crystal 2 of the second doping Nd ³⁺ are provided with the first 45 ° reflection mirror 5 successively, the first doping Nd ³⁺ laser crystal 1 and Its pumping source 3, the second doped Nd ³⁺ laser crystal 2 and its pumping source 4, the second 45° mirror 6, a polarization beam splitter 7, the first frequency doubling crystal 8, and the first plane mirror 9 , the second frequency doubling crystal 10, the third 45 ° reflector 11; the side facing the first 45 ° reflector 5 on the horizontal optical path perpendicular to the vertical optical path is provided with the first harmonic reflector 12, the third Frequency doubling crystal 13 and first outcoupling mirror 14; The second harmonic mirror 15, the fourth frequency doubling crystal 16 are arranged on the side facing the second 45 ° reflector 6 on the horizontal optical path perpendicular to the vertical optical path , the first sum frequency crystal 17 and the second outcoupling mirror 18; the side facing the third 45° reflector 11 on the horizontal optical path perpendicular to the vertical optical path is provided with the third harmonic reflector 19, the second and The frequency crystal 20 and the third outcoupling mirror 21; the third 45° reflection on the optical path perpendicular to the horizontal optical path. A rectangular reflective prism 22 is placed on the other side of the mirror 11 . Wherein, the first 45° reflector 5 is coated with 1.0um and 1.3um band range fundamental frequency light high-reflection film near the first side of the laser crystal 1 doped with Nd3 ⁺ ; the second 45° reflector 6 One side of the laser crystal 2 close to the second doped Nd ³⁺ is coated with a 1.3um band range fundamental frequency optical high reflection coating and a 1.0um band range fundamental frequency optical anti-reflection coating, and the other side is coated with a 1.0um band range fundamental frequency optical Transparent film; both sides of the third 45° reflector 11 are coated with a high-transparency film for fundamental frequency light in the 1.0um band range, and the side close to the second frequency doubling crystal 10 is also coated with a high-reflection film for ultraviolet light in the 0.2um band range;

Both sides of the first plane reflector 9 are coated with an anti-reflection coating for frequency doubling light in the 0.5um band range, and the side close to the first frequency doubling crystal 8 is also coated with a high reflection film for fundamental frequency light in the 1.0um band range.

The side of the polarizing beam splitter 7 close to the second 45° reflector 6 is coated with a 1.0um band range 's' polarization and 'p' polarization anti-reflection coating for fundamental frequency light, and the side close to the first frequency doubling crystal 8 is coated with 1.0um band range 's' polarized light anti-reflection coating, the side close to the rectangular reflective prism 22 is coated with 1.0um band range 'p' polarized light anti-reflection film.

Both optical surfaces of the first harmonic reflector 12 are coated with 1.3um and 1.0um band range fundamental frequency anti-reflection coatings, and the side close to the third frequency doubling crystal 13 is also coated with 0.5um band range frequency doubling light height Anti-coating: the two optical surfaces of the second harmonic reflector 15 are coated with a 1.3um band range fundamental frequency anti-reflection film, and the side close to the fourth frequency doubling crystal 16 is also coated with a 0.6um band range frequency doubling light high reflection film ; The two optical surfaces of the third harmonic reflector 19 are coated with 1.0um band range fundamental frequency light and 0.2um band range frequency multiplier light anti-reflection coating, and the side near the second sum frequency crystal 20 is also coated with 0.2um band range And frequency light high reflection film.

The side of the first outcoupling mirror 14 close to the third frequency doubling crystal 13 is coated with a high-reflection film for fundamental frequency light in the range of 1.3um and 1.0um and a high-transparency film for frequency doubling light in the range of 0.5um; the second outcoupling mirror 18 is close to One side of the first sum-frequency crystal 17 is coated with a high-reflection film of 1.3um band range fundamental frequency light and 0.6um band range multiplier light and a high-transparency film of 0.4 band range sum-frequency light; the third coupling output mirror 21 is close to the second sum-frequency One side of the crystal 20 is coated with a high-reflection film for the fundamental frequency light in the 1.0um band range and a double-frequency light in the 0.2um band range, and a high-transparency film for the 0.2 band range and frequency light.

The surface of the right-angle reflective prism 22a1 is coated with a 1.0um waveband range 'p' polarized light anti-reflection film and is perpendicular to the vertical plane of the first Nd ³⁺ doped laser crystal 1 and the second Nd ³⁺ doped laser crystal 2 The plane formed by the straight optical path and the horizontal optical path perpendicular to the vertical optical path, the a2 surface and the a3 surface are coated with a high-reflection film of 'p' polarized light in the 1.0um band range, and the two planes are perpendicular to each other.

The first Nd ³⁺ doped laser crystal 1 and the second Nd ³⁺ doped laser crystal 2 are neodymium-doped yttrium aluminum garnet Nd ³⁺ : YAG, neodymium-doped yttrium vanadate Nd ³⁺ : YVO ₄ , Neodymium-doped yttrium aluminate Nd ³⁺ : YAP, neodymium-doped yttrium lithium fluoride Nd ³⁺ : the same crystal in YLF laser crystal, both optical surfaces of the crystal are coated with 1.0um and 1.3um band range fundamental frequency light anti-reflection membrane.

The pumping source 3 of the first Nd ³⁺ doped laser crystal 1 and the pumping source 4 of the second Nd ³⁺ doped laser crystal 2 are laser diode pumping sources or xenon lamp pumping sources.

The first frequency-doubling crystal 8, the third frequency-doubling crystal 13 and the fourth frequency-doubling crystal 16 are the same crystal in lithium triborate LBO, β-barium metaborate BBO, potassium titanyl phosphate KTP, or one of them respectively Any crystal of any crystal; the second frequency doubling crystal 10 is a crystal in cesium-lithium-borate crystal CLBO, β-barium metaborate BBO and cesium triborate CBO crystal; the first sum frequency crystal 17 is a lithium triborate LBO crystal; the second sum frequency crystal 20 is one of cesium-lithium-borate crystal CLBO and β-barium metaborate BBO crystal.

The two planes a3 and a2 of the rectangular reflective prism 22 are perpendicular to each other, and the length of the a1 plane is greater than the length of the vertical optical path from the polarizing beam splitter 7 to the third 45° reflector 11 .

Based on the blue, green and ultraviolet solid-state laser devices for latent communication applications, the laser generation method is carried out according to the following steps:

1) After the first laser crystal 1 doped with Nd ³⁺ and the second laser crystal 2 doped with Nd ³⁺ respectively absorb the energy radiated by the first pump source 3 on the side and the second pump source 4 on the side, an inversion is formed Particle number distribution, Nd ³⁺ transitions between energy levels ⁴ F _3/2 - ⁴ I _11/2 and ⁴ F _3/2 - ⁴ I _13/2 respectively, producing stimulated fluorescence in the 1.0um and 1.3um bands Radiation, the radiated fluorescence will oscillate and amplify in their corresponding laser resonators to form a stable fundamental frequency oscillation light, in which the fundamental frequency in the 1.0um band range is emitted vertically upward by two Nd ³⁺ doped laser crystals After the light is reflected by the first 45° reflector 5, the first harmonic reflector 12 is incident on the third frequency-doubling crystal 13, and the third frequency-doubling crystal 13 frequency-multiplies to generate green light in the 0.5um band range. The converted fundamental frequency light in the 1.0um band range reaches the first coupling output mirror 14 together, and the fundamental frequency light in the 1.0um band range is reflected and then passes through the third frequency doubling crystal 13 again to generate frequency doubling green light, which passes through the third frequency doubling twice The frequency-doubled green light generated by the crystal 13 is reflected by the first harmonic reflector 12 and then horizontally output out of the cavity through the first coupling output mirror 14, and the remaining fundamental frequency light in the 1.0um band range returns along the original path after twice frequency doubling After passing through the first laser crystal 1 doped with Nd ³⁺ and the second laser crystal 2 doped with Nd ³⁺ , together with the fundamental frequency light in the 1.0um band range generated vertically downward, it reaches the second 45° reflector 6 Polarizing beam splitter 7, polarizing beam splitter 7 divides it into two paths, that is, the 's' polarization that passes vertically and the 'p' polarization that is reflected horizontally. The 's' polarized 1.0um band range fundamental frequency light is multiplied by the first frequency doubling crystal 8 times to generate 0.5um band range green light, reflected by the first plane mirror 9 and then passes through the first frequency doubling crystal 8 again, and the green light produced twice The light is output to the second frequency-doubling crystal 10 through the first plane mirror 9, and the remaining 's' polarized 1.0um band range fundamental frequency light returns to the first coupling-out mirror 14 through the original path, and the first coupling-out mirror 14 and the first The generation and output of stable oscillation and optical amplification and frequency-doubled green light are formed between the plane reflectors 9;

2) The 1.0um polarized fundamental frequency light reflected in the horizontal direction of the polarization beam splitter 7 is incident on the plane a2 by the vertical right-angle reflective prism 22a1, and after being reflected twice by the plane a2 and a3, it passes through the horizontal direction of the plane a1 The output reaches the third 45° mirror 11;

3) The green light in the 0.5um band range output by the first plane reflector described in step 1) is 10 times frequency-multiplied by the second frequency doubling crystal to generate ultraviolet light in the 0.26um band range, and the ultraviolet light in the band range passes through the third 45° Reflected by the reflector 11, together with the 1.0um wave band range 'p' polarized fundamental frequency light that reaches the third 45° reflector 11 in step 2) and arrives at the second sum frequency crystal 20 through the third harmonic reflector 19, and passes through the sum frequency After the action, the remaining 'p' polarized fundamental frequency light in the 1.0um band range and the ultraviolet light in the 0.26um band range pass through the second sum frequency crystal 20 again, and the 0.21um band ultraviolet laser light generated after the two sum frequency actions is reflected by the third harmonic After being reflected by the mirror 19, the third outcoupling mirror 21 is horizontally output out of the cavity, and the remaining 1.0um wavelength range 'p' polarized fundamental frequency light returns to the first outcoupling mirror 14 along the original path, and the first outcoupling mirror 14 and the third outcoupling mirror Stable oscillation and optical amplification are formed between the coupling output mirrors 21, and combined with the 0.26um band ultraviolet light to generate a 0.21um band ultraviolet laser output;

4) In step 1), the fundamental frequency light of the 1.3um waveband range emitted vertically upward by two laser crystals doped with Nd ³⁺ goes through the first 45° reflector 5, the first harmonic reflector 12 and the third times The high-frequency crystal 13 is incident on the first coupling output mirror 14, and returns along the original path after reflection and the fundamental frequency light in the 1.3um band range emitted vertically downward by the two Nd ³⁺ -doped laser crystals is passed by the second 45° reflective mirror together. 6 reflection, through the second harmonic reflector 15 to reach the fourth frequency doubling crystal 16 to generate red light in the 0.6um band range, the red light in the 0.6um band range emitted by the left end surface of the fourth frequency doubling crystal 16 passes through the second harmonic reflector 15 After reflection, the red light in the 0.6um band range emitted by the right end face and the remaining fundamental frequency light in the 1.3um band range pass through the first sum frequency crystal 17 to generate blue light in the 0.4um band range, which is horizontally output outside the cavity by the second coupling output mirror 18. The remaining unconverted fundamental frequency light in the 1.3um band range and red light in the 0.6um band range return along the original path, and the fundamental frequency light in the 1.3um band range is formed between the first outcoupling mirror 14 and the second outcoupling mirror 18 Stable oscillation, the red light in the 0.6um wavelength range forms a stable oscillation between the second harmonic reflector 15 and the second outcoupling mirror 18 .

Example 1

Referring to Fig. 1, it is a three-wavelength visible light laser device with LD side-pumped Nd ³⁺ :YAG simultaneously outputting 532nm green light, 440nm blue light, and 213nm ultraviolet light. The first outcoupling mirror 14 of the device forms a 1064nm's' polarized light resonator with the first 45° reflector 5 and the first plane reflector 9, and the first 45° reflector 5, polarizing beam splitter 7, right-angle reflector prism 22 , the third 45° reflector 11 and the third outcoupling mirror 21 form a 1064nm 'p' polarized light resonator; and the first 45° reflector 5, the second 45° reflector 6 and the second outcoupling mirror 18 form a 1319nm Fundamental frequency optical resonator. The first Nd ³⁺ : YAG laser crystal 1 and the second Nd ³⁺ : YAG laser crystal 2 are connected in series with the first 45° reflector 5 on the vertical optical path, and the first doped Nd ³⁺ laser crystal 1 and its pump source 3, the second doped Nd ³⁺ laser crystal 2 and its pump source 4, the second 45° mirror 6, the polarization beam splitter 7, the first frequency doubling crystal 8, the first plane reflector Mirror 9, the second frequency doubling crystal 10, the third 45 ° reflector 11; on the horizontal optical path perpendicular to the vertical optical path facing the first 45 ° reflector 5, the first harmonic reflector 12, The third frequency doubling crystal 13 and the first outcoupling mirror 14; the side facing the second 45° reflector 6 on the horizontal light path perpendicular to the vertical light path is provided with the second harmonic reflector 15, the fourth frequency multiplier in turn Crystal 16, the first sum frequency crystal 17 and the second outcoupling mirror 18; the side facing the third 45° reflector 11 on the horizontal optical path perpendicular to the vertical optical path is provided with the third harmonic reflector 19, the second harmonic reflector 11 successively Two sum frequency crystals 20 and a third outcoupling mirror 21; a right-angle reflective prism 22 is placed on the vertical optical path on the other side of the horizontal optical path of the third 45° reflective mirror 11.

All the lenses are flat mirrors fixed on the two-dimensional adjustment frame, and the diameter is Φ=20mm. Among them, the side of the first 45° reflector 5 close to the laser crystal is coated with 1064nm and 1319nm fundamental frequency high-reflection film (R>99.8 %); the side of the second 45° reflector 6 near the laser crystal is coated with a 1319nm fundamental frequency light high-reflection coating (R>99.8%) and a 1064nm fundamental frequency light anti-reflection coating (T>99.8%), and the other side is coated with 1064nm fundamental frequency light anti-reflection film (T>99.8%) is arranged; The 3rd 45 ° reflecting mirror 11 both sides are coated with 1064nm fundamental frequency light high-transparency film (T>99.8%), close to the second frequency doubling crystal 10 One side is also coated with 266nm UV high reflection film (R>99.8%);

The side of the first 45° reflector 5 close to the laser crystal is coated with 1064nm and 1319nm fundamental frequency light high reflection film (R>99.8); the side of the second 45° reflector 6 close to the laser crystal is coated with 1319nm fundamental frequency light high Anti-reflection film (R>99.8) and 1064nm fundamental frequency light anti-reflection film (T>99.8), the other side is coated with 1064nm fundamental frequency light anti-reflection film (T>99.8); The third 45 ° mirror 11 both sides are coated There is a 1064nm fundamental frequency high-transparency film (T>99.8), and the side close to the second frequency doubling crystal 10 is also coated with a 266nm ultraviolet high-reflection film (R>99.8);

Both sides of the first plane reflector 9 are coated with 532nm frequency doubling light anti-reflection coating (T>99.8), and the side close to the first frequency doubling crystal 8 is also coated with 1064nm fundamental frequency light high reflection coating (R>99.8).

The polarizing beam splitter 7 is coated with 1064nm 's' polarization and 'p' polarization fundamental frequency light anti-reflection coating (T>99.8) on one side close to the second 45° reflector 6, and one side close to the first frequency doubling crystal 8 It is coated with 1064nm's' polarized light anti-reflection film (T>99.8), and the side close to the right-angle reflective prism 22 is coated with 1064nm'p' polarized light anti-reflection film (T>99.8).

The first harmonic reflector 12 is coated with 1319nm and 1064nm fundamental frequency anti-reflection film (T>99.8) on both pass optical surfaces, and the side near the third frequency doubling crystal 13 is also coated with 532nm frequency doubling light high reflection film (R >99.8); the two optical surfaces of the second harmonic reflector 15 are coated with 1319nm fundamental frequency anti-reflection coating (T>99.8), and the side close to the fourth frequency doubling crystal 16 is also coated with 660nm frequency doubling light high reflection coating (R>99.8); The third harmonic reflector 19 two-pass optical surfaces are coated with 1064nm fundamental frequency light and 266nm frequency doubling light anti-reflection coating (T>99.8), and the side near the second sum frequency crystal 20 is also coated with 213nm and frequency light high reflection film (R>99.8).

The first outcoupling mirror 14 is coated with 1319nm and 1064nm fundamental frequency light high reflection film (R>99.8) and 0.5 frequency doubling light high transparency film (T>99.8) on one side near the third frequency doubling crystal 13; the second outcoupling mirror 18 The side close to the first sum frequency crystal 17 is coated with 1319nm fundamental frequency light and 660nm frequency doubling light high reflection film (R>99.8) and 0.4 sum frequency light high transparency film (T>99.8); the third coupling output mirror 21 is close to One side of the second sum frequency crystal 20 is coated with a high reflection film (R>99.8) for 1064nm fundamental frequency light and 266nm frequency doubled light and a high transmittance film (T>99.8) for 213nm sum frequency light.

The surface of the right-angle reflective prism 22a1 is coated with a 1064nm 'p' polarizing anti-reflection film (T>99.8) and is perpendicular to the vertical plane of the first Nd ³⁺ -doped laser crystal 1 and the second Nd ³⁺ -doped laser crystal 2. The straight light path and the horizontal light path perpendicular to the vertical light path form a plane, and the surfaces a2 and a3 of the rectangular reflective prism 22 are coated with a 1064nm 'p' polarized light high-reflection film (R>99.8) and the two planes are perpendicular to each other.

The doping concentration of Nd ^{3+ in the first Nd 3+} :YAG laser crystal 1 and the second Nd ³⁺ :YAG laser crystal 2 is both 1.0at%, the ^size is Φ3×10mm, and the two optical surfaces of each crystal are coated There are 1064nm and 1319nm high transmittance films (T>99.8).

Both the first frequency doubling crystal 8 and the third frequency doubling crystal 13 are Class II critical phase matching (θ=90°, Φ=23.8°) KTP crystals, the size is 3mm×3mm×5mm, and the two optical surfaces are coated with 1064nm and 532nm two-color anti-reflection coating (T>99.8%), the side is evenly coated with silver powder and wrapped with indium foil, then placed in a water-cooled copper block.

Both the second frequency doubling crystal 10 and the second sum frequency crystal 20 are BBO crystals with Class I critical phase matching, and the critical angles are: (θ=47.6°, Φ=0°) and (θ=51.1°, Φ=0 °), the size is 3mm3mm5mm, the side is evenly coated with silver powder and wrapped with indium foil and placed in a water-cooled copper block.

The fourth frequency multiplier crystal 16 and the first sum frequency crystal 17 are selected from Class I non-critical phase-matched LBO crystal (θ=85.9°, Φ=0°) and Class II non-critical phase-matched (θ=0°, Φ =0°)LBO crystal, the size is 335mm3, and the optical surfaces of both channels are coated with 1319nm, 660nm and 440nm three-color anti-reflection coatings (T>95.5%).

The two planes a2 and a3 of the rectangular reflective prism 22 are perpendicular to each other, and the length of the a1 plane is greater than the length of the vertical optical path from the polarizing beam splitter 7 to the third 45° reflector 11 . The a1 side is coated with a 1064nm anti-reflection coating (T>99.8%), and both sides of a2 and a3 are coated with a 1064nm high-reflection coating (R>98.5%).

The three-wavelength laser generation method is carried out as follows:

1) After the first Nd ³⁺ :YAG laser crystal 1 and the second Nd ³⁺ :YAG laser crystal 2 absorb the energy radiated by the side pump sources 3 and 4 of the LD (Laser diode) respectively, an inverted particle number distribution is formed, and the Nd ³⁺ transitions between energy levels 4F3/2-4I11/2 and 4F3/2-4I13/2 respectively, producing stimulated fluorescence radiation at 1064nm and 1319nm, and the radiated fluorescence will oscillate and amplify in the corresponding laser resonators Form a stable fundamental frequency oscillating light, wherein the 1064nm fundamental frequency light emitted vertically upward by the two Nd ³⁺ -doped laser crystals 1 and 2 is reflected by the first 45° mirror 5 to reflect the first harmonic The reflector 12 is incident on the third frequency doubling crystal KTP13, and the third frequency doubling crystal KTP13 generates 532nm green light, and the green light and the unconverted 1064nm fundamental frequency light reach the first coupling output mirror 14 together, and the 1064nm fundamental frequency light reaches the first coupling output mirror 14. After the frequency light is reflected, it passes through the third frequency-doubling crystal KTP13 again to generate frequency-doubling green light, and the frequency-doubling green light generated by the third frequency doubling crystal 13 is reflected by the first harmonic reflector 12 and is output through the first coupling together. The mirror 14 horizontally outputs outside the cavity, and the remaining 1064nm fundamental frequency light after twice frequency doubling returns along the original path through the first Nd ³⁺ :YAG laser crystal 1 and the second Nd ³⁺ :YAG laser crystal 2, and vertically The 1064nm fundamental frequency light generated downward passes through the second 45° mirror 6 and reaches the polarizing beam splitter 7, and the polarizing beam splitter 7 divides it into two paths, that is, the 's' polarization passed vertically and the 'p' reflected horizontally Polarized 1064nm fundamental frequency light, wherein the 's' polarized 1064nm fundamental frequency light passed vertically by the first channel is multiplied by the first frequency doubling crystal KTP8 to generate 532nm green light, reflected by the first plane mirror 9 and then passed through the first time again Frequency crystal KTP8, the green light generated twice is output to the second frequency doubling crystal BBO10 through the first plane reflector 9, and the remaining 's' polarized 1064nm fundamental frequency light returns to the first coupling output mirror 14 in the original way, and in the first coupling Between the output mirror 14 and the first plane reflector 9, stable oscillation and optical amplification and frequency-multiplied green light are generated and output;

2) The 1064nm 'p' polarized fundamental frequency light reflected in the horizontal direction by the polarizing beam splitter 7 is incident on the a1 plane of the vertical right-angle reflective prism 22 to the a2 plane, and after being reflected twice by the a2 plane and a3 plane, it is output horizontally through the a1 plane Reach the third 45° reflector 11;

3) The 532nm green light output by the first plane reflector described in step 1) is frequency-multiplied by the second frequency-doubling crystal BBO10 to generate 266nm ultraviolet light, which is reflected by the third 45° reflector 11 and then compared with step 2 ) arrives at the third 45° reflector 11 in the 1064nm'p' polarized fundamental frequency light and reaches the second sum frequency crystal BBO20 through the third harmonic reflector 19 together, after the sum frequency action, the remaining 1064nm'p' polarized fundamental frequency Light and 266nm ultraviolet light pass through the second sum-frequency crystal BBO20 again, and the 213nm ultraviolet laser generated after the two sum-frequency actions is reflected by the third harmonic reflector 19 and then horizontally output outside the cavity by the third coupling output mirror 21, and the remaining 1064nm' The p' polarized fundamental frequency light returns to the first outcoupling mirror 14 along the original path, forming stable oscillation and light amplification between the first outcoupling mirror 14 and the third outcoupling mirror 21, and generates a 213nm frequency with 266nm ultraviolet light UV laser output;

4) In step 1), the 1319nm fundamental frequency light emitted vertically upward by two Nd ³⁺ : YAG laser crystals is incident on the first 45° reflector 5, the first harmonic reflector 12 and the third frequency doubling crystal 13 The first coupling-out mirror 14 returns along the original path after reflection and the 1319nm fundamental frequency light emitted vertically downward by the two Nd ³⁺ : YAG laser crystals is reflected by the second 45° reflector 6 together, and passes through the second harmonic reflector 15 reaches the fourth frequency doubling crystal LBO16 to produce 660nm red light, the 660nm red light emitted by the left end face of the fourth frequency doubling crystal LBO16 is reflected by the second harmonic reflector 15 and is the same as the 660nm red light emitted by the right end face and the remaining 1.3um base The frequency light passes through the first sum frequency crystal LBO17 to generate 440nm blue light, which is output outside the cavity horizontally by the second coupling output mirror 18, and the remaining unconverted 1319nm fundamental frequency light and 660nm red light return along the original path, and the 1319nm fundamental frequency light is at the A stable oscillation is formed between the first coupling output mirror 14 and the second coupling output mirror 18 , and the 660nm red light forms a stable oscillation between the second harmonic reflection mirror 15 and the second coupling output mirror 18 .

Claims (9)

1. indigo plant, green, the ultraviolet solid-state laser apparatus based on the communications applications of diving, comprise two-rod series connection the first doping Nd ³⁺laser crystal (1) and second the doping Nd ³⁺laser crystal (2), it is characterized in that two-rod series connection first doping Nd ³⁺laser crystal (1) and second the doping Nd ³⁺the vertical light path of laser crystal (2) on be disposed with the one 45 ° of speculum (5), the first doping Nd ³⁺laser crystal (1) and pumping source (3) thereof, the second doping Nd ³⁺laser crystal (2) and pumping source (4) thereof, the 2 45 ° of speculum (6), polarization beam apparatus (7), the first frequency-doubling crystal (8), the first plane mirror (9), the second frequency-doubling crystal (10), the 3 45 ° of speculum (11); One side towards the one 45 ° of speculum (5) on the horizontal optical path vertical with described vertical light path is disposed with first harmonic speculum (12), frequency tripling crystal (13) and the first output coupling mirror (14); Be disposed with second harmonic speculum (15), quadruple frequency crystal (16), first and crystal (17) and the second output coupling mirror (18) frequently towards the one side of the 2 45 ° of speculum (6) on the horizontal optical path vertical with described vertical light path; Be disposed with third harmonic speculum (19), second and crystal (20) and the 3rd output coupling mirror (21) frequently towards the one side of the 3 45 ° of speculum (11) on the horizontal optical path vertical with described vertical light path; On the light path vertical with described horizontal optical path, the another side of the 3 45 ° of speculum (11) is placed with right-angle reflecting prism (22); Wherein:

Described the one 45 ° of speculum (5) is near the first doping Nd ³⁺the one side of laser crystal (1) be coated with 1.0 μ m and 1.3 mu m waveband scope fundamental frequency light high-reflecting films;

Described the 2 45 ° of speculum (6) is near the second doping Nd ³⁺the one side of laser crystal (2) be coated with 1.3 mu m waveband scope fundamental frequency light high-reflecting films and 1.0 mu m waveband scope fundamental frequency light anti-reflection films, another side is coated with 1.0 mu m waveband scope fundamental frequency light anti-reflection films;

Described the 3 45 ° of speculum (11) two sides all is coated with 1.0 mu m waveband scope fundamental frequency light high transmittance films, and the one side of close the second frequency-doubling crystal (10) also is coated with 0.266 μ m ultraviolet frequency double light high-reflecting film;

Described the first plane mirror (9) two sides all is coated with 0.5 mu m waveband scope frequency doubled light anti-reflection film, and the one side of close the first frequency-doubling crystal (8) also is coated with 1.0 mu m waveband scope fundamental frequency light high-reflecting films;

Described polarization beam apparatus (7) is coated with 1.0 mu m waveband scope ' s ' polarizations and ' p ' polarization fundamental frequency light anti-reflection film near the one side of the 2 45 ° of speculum (6), one side near the first frequency-doubling crystal (8) is coated with 1.0 mu m waveband scope ' s ' polarised light anti-reflection films, and the one side of close right-angle reflecting prism (22) is coated with 1.0 mu m waveband scope ' p ' polarised light anti-reflection films;

The logical light face of described first harmonic speculum (12) two all is coated with 1.3 μ m and 1.0 mu m waveband scope fundamental frequency light anti-reflection films, and the one side of close frequency tripling crystal (13) also is coated with 0.5 mu m waveband scope frequency doubled light high-reflecting film; The logical light face of second harmonic speculum (15) two all is coated with 1.3 mu m waveband scope fundamental frequency light anti-reflection films, and the one side of close quadruple frequency crystal (16) also is coated with 0.6 mu m waveband scope frequency doubled light high-reflecting film;

Described third harmonic speculum (19) two leads to the light face and all is coated with 1.0 mu m waveband scope fundamental frequency light and 0.266 μ m ultraviolet frequency double light anti-reflection film, near second, with the one side of frequency crystal (20), also is coated with 0.213 μ m ultraviolet and frequency light high-reflecting film;

Described the first output coupling mirror (14) is coated with 1.3 μ m and 1.0 mu m waveband scope fundamental frequency light high-reflecting films and 0.5 mu m waveband scope frequency doubled light high transmittance film near the one side of frequency tripling crystal (13); The second output coupling mirror (18) is coated with 1.3 mu m waveband scope fundamental frequency light and 0.6 mu m waveband scope frequency doubled light high-reflecting film and 0.4 mu m waveband scope and frequency light high transmittance film near first with the one side of frequency crystal (17); The 3rd output coupling mirror (21) is coated with 1.0 mu m waveband scope fundamental frequency light and 0.266 μ m ultraviolet frequency double light high-reflecting film and 0.213 μ m ultraviolet and frequency light high transmittance film near second with the one side of frequency crystal (20);

Described right-angle reflecting prism (22) a1 face is coated with 1.0 mu m waveband scope ' p ' polarised light anti-reflection films, and a1 face, a2 face and a3 face are all perpendicular to above-mentioned the first doping Nd ³⁺laser crystal (1) and second the doping Nd ³⁺the plane that forms with the horizontal optical path vertical with vertical light path of the vertical light path of laser crystal (2), it is orthogonal that a2 face and a3 face all are coated with 1.0 mu m waveband scope ' p ' polarised light high-reflecting films and a2 face and a3 face.

2. indigo plant, green, the ultraviolet solid-state laser apparatus based on the communications applications of diving according to claim 1, is characterized in that, described the first doping Nd ³⁺laser crystal (1) and second the doping Nd ³⁺laser crystal (2) be neodymium-doped yttrium-aluminum garnet Nd ³⁺: YAG, Nd-doped yttrium vanadate Nd ³⁺: YVO4, neodymium-doped yttrium aluminate Nd ³⁺: YAP, neodymium-doped yttrium-fluoride lithium Nd ³⁺: the same crystal in the YLF Lasers crystal, the logical light face of crystal two all is coated with 1.0 μ m and 1.3 mu m waveband scope fundamental frequency light anti-reflection films.

3. indigo plant, green, the ultraviolet solid-state laser apparatus based on the communications applications of diving according to claim 1, is characterized in that, described the first doping Nd ³⁺the pumping source (3) of laser crystal (1) and the second doping Nd ³⁺the pumping source (4) of laser crystal (2) is laser diode pumping source or xenon flash lamp pumping source.

4. indigo plant, green, the ultraviolet solid-state laser apparatus based on the communications applications of diving according to claim 1, it is characterized in that, described the first frequency-doubling crystal (8), frequency tripling crystal (13) and quadruple frequency crystal (16) are the same crystal of three lithium borate LBO, beta-barium metaborate BBO, potassium titanium oxide phosphate KTP, or are respectively any one crystal wherein.

5. indigo plant, green, the ultraviolet solid-state laser apparatus based on the communications applications of diving according to claim 1, it is characterized in that, described the second frequency-doubling crystal (10) is a kind of crystal in caesium-lithium-borate crystal CLBO, beta-barium metaborate BBO and cesium triborate CBO crystal.

6. indigo plant, green, the ultraviolet solid-state laser apparatus based on the communications applications of diving according to claim 1, is characterized in that, described first and frequently crystal (17) be three lithium borate lbo crystals.

7. indigo plant, green, the ultraviolet solid-state laser apparatus based on the communications applications of diving according to claim 1, is characterized in that, described second and frequently crystal (20) be a kind of crystal in caesium-lithium-borate crystal CLBO and beta-barium metaborate bbo crystal.

8. indigo plant, green, the ultraviolet solid-state laser apparatus based on the communications applications of diving according to claim 1, described right-angle reflecting prism (22) a3 and a2 two sides are orthogonal, the a1 face 'slength is greater than the length of polarization beam apparatus (7) to the vertical direction light path of the 3 45 ° of speculum (11).

9. the laser generation method of an indigo plant based on the communications applications of diving, green, ultraviolet solid-state laser apparatus, the method is carried out according to following step:

1) the first doping Nd ³⁺laser crystal (1) and second the doping Nd ³⁺laser crystal (2) absorb respectively the energy of side the first pumping source (3) and side the second pumping source (4) radiation after, form inverted population and distribute, Nd ³⁺at energy level ⁴f _3/2- ⁴i _11/2with ⁴f _3/2- ⁴i _13/2between respectively transition, the excited fluorescence radiation that produces 1.0 μ m and 1.3 mu m waveband scopes, the fluorescence of radiation can form stable base frequency oscillation light after vibration in corresponding laser resonant cavity is separately amplified, wherein by two doping Nd ³⁺the fundamental frequency light of the 1.0 mu m waveband scopes of emission straight up that provide of laser crystal incide frequency tripling crystal (13) through the one 45 ° of speculum (5) reflection by first harmonic speculum (12), produce 0.5 mu m waveband scope green glow through frequency tripling crystal (13) frequency multiplication, the green glow produced and 1.0 mu m waveband scope fundamental frequency light of unconverted together arrive the first output coupling mirror (14), 1.0 again by frequency tripling crystal (13), produce frequency doubling green light after mu m waveband scope fundamental frequency light is reflected, the frequency doubling green light produced by frequency tripling crystal (13) for twice by first harmonic speculum (12) reflection after together outside the first output coupling mirror (14) horizontal output chamber, twice after frequency multiplication remaining 1.0 mu m waveband scope fundamental frequency Guang Yanyuan roads return through the first doping Nd ³⁺laser crystal (1), second the doping Nd ³⁺laser crystal (2) after, together through the 2 45 ° of speculum (6), arrive polarization beam apparatus (7) with the 1.0 mu m waveband scope fundamental frequency light that produce straight down, polarization beam apparatus (7) is divided into two-way, ' p ' polarization 1.0 mu m waveband scope fundamental frequency light of ' s ' polarization vertically passed through and horizontal reflection, wherein, ' s ' polarization 1.0 mu m waveband scope fundamental frequency light that the first via is vertically passed through are after the first frequency-doubling crystal (8) frequency multiplication produces 0.5 mu m waveband scope green glow, again pass through the first frequency-doubling crystal (8) through the first plane mirror (9) reflection, the green glow of twice generation outputs to the second frequency-doubling crystal (10) through the first plane mirror (9), turn back to the first output coupling mirror (14) and remain ' s ' polarization 1.0 mu m waveband scope fundamental frequency Guang Yuan roads, form generation and the output of stable oscillation stationary vibration and light amplification and frequency doubling green light between the first output coupling mirror (14) and the first plane mirror (9),

2) 1.0 mu m waveband scope ' p ' the polarization vertical right-angle reflecting prism of fundamental frequency light (22) the a1 faces through the reflection of polarization beam apparatus (7) horizontal direction incide the a2 face, after a2 face and a3 face two secondary reflections, through the output of a1 face horizontal direction, arrive the 3 45 ° of speculum (11);

3) the 0.5 mu m waveband scope green glow by the first plane mirror output step 1) produces 0.26 mu m waveband scope ultraviolet frequency double light after the second frequency-doubling crystal (10) frequency multiplication, this wavelength band ultraviolet light after the 3 45 ° of speculum (11) reflection with step 2) in arrive the 3 45 ° of speculum (11) 1.0 mu m waveband scope ' p ' polarization fundamental frequency light together through third harmonic speculum (19), arrive second and frequency crystal (20), after acting on frequency, remain 1.0 mu m waveband scope ' p ' polarization fundamental frequency light and 0.26 mu m waveband scope ultraviolet frequency double light again by second and crystal (20) frequently, the 0.21 mu m waveband ultraviolet produced after twice and frequently effect and frequently light after third harmonic speculum (19) reflection by the 3rd output coupling mirror (21) horizontal output chamber outside, remain 1.0 mu m waveband scope ' p ' polarization fundamental frequency light Ze Yanyuan roads and return to the first output coupling mirror (14), form stable oscillation stationary vibration and light amplification between the first output coupling mirror (14) and the 3rd output coupling mirror (21), and produce 0.21 mu m waveband ultraviolet and light output frequently with 0.26 mu m waveband ultraviolet frequency double light and frequency,

4) in step 1) in by two doping Nd ³⁺the fundamental frequency light of the laser crystal 1.3 mu m waveband scopes of launching straight up incide the first output coupling mirror (14) through the one 45 ° of speculum (5), first harmonic speculum (12) and frequency tripling crystal (13), through reflection Yan Yuan road, return and two doping Nd ³⁺the fundamental frequency light of the laser crystal 1.3 mu m waveband scopes of launching straight down together by the 2 45 ° of speculum (6), reflected, arrive quadruple frequency crystal (16) by second harmonic speculum (15) and produce 0.6 mu m waveband scope ruddiness, the 0.6 mu m waveband scope ruddiness that the 0.6 mu m waveband scope ruddiness that send quadruple frequency crystal (16) left side sends with right side after second harmonic speculum (15) reflection together produces 0.4 mu m waveband scope blue light by first with frequency crystal (17) with the fundamental frequency light of residue 1.3 mu m waveband scopes, outside the second output coupling mirror (18) horizontal output chamber, fundamental frequency light and the 0.6 mu m waveband scope ruddiness Yan Yuan road of 1.3 mu m waveband scopes of residue unconverted are returned, 1.3 the fundamental frequency light of mu m waveband scope forms stable oscillation stationary vibration between the first output coupling mirror (14) and the second output coupling mirror (18), 0.6 mu m waveband scope ruddiness forms stable oscillation stationary vibration between second harmonic speculum (15) and the second output coupling mirror (18).

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