CN119154082A - Single-frequency pulse laser with high spectral purity - Google Patents
Single-frequency pulse laser with high spectral purity Download PDFInfo
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- CN119154082A CN119154082A CN202411219556.XA CN202411219556A CN119154082A CN 119154082 A CN119154082 A CN 119154082A CN 202411219556 A CN202411219556 A CN 202411219556A CN 119154082 A CN119154082 A CN 119154082A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
- H01S3/108—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
- H01S3/1123—Q-switching
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Abstract
The application discloses a high-spectral-purity single-frequency pulse laser which comprises a pumping light processing system, an active resonant cavity, a gain medium, an optical pulse generating device and a nonlinear optical modulator, wherein the gain medium is arranged on an emergent light path of an input mirror of the active resonant cavity, the optical pulse generating device and the nonlinear optical modulator are both arranged in the active resonant cavity, the optical pulse generating device is used for adjusting the loss of the active resonant cavity so as to form pulse light, the nonlinear optical modulator is used for rapidly increasing the loss difference between different modes in the resonant cavity so as to generate the high-spectral-purity single-frequency pulse laser, and the nonlinear optical modulator comprises a nonlinear crystal which is arranged on a light path between the gain medium and an output mirror of the active resonant cavity. The application uses nonlinear crystal, light pulse generator and gain medium to make the sub-mode annihilate rapidly in a short time, thus realizing single frequency pulse laser output with high spectrum purity.
Description
Technical Field
The application relates to the technical field of lasers, in particular to a single-frequency pulse laser with high spectral purity.
Background
The all-solid-state single-frequency pulse laser has the advantages of narrow line width, low noise, good coherence, high conversion efficiency, compact structure and the like, and has been widely applied to the fields of laser weapons, laser radars, space laser communication, coherent optical communication, high-precision spectrum measurement, gravitational wave detection and the like. However, with the continuous and intensive research of science, these fields put higher demands on all-solid-state single-frequency pulse lasers, and not only the output power of the lasers needs to be higher, but also the spectral purity needs to be better, that is, the line width of the lasers needs to be as narrow as possible. The method is characterized in that the higher the output power of the laser, the larger the action intensity, the longer the transmissible distance, the higher the spectral purity, the better the time coherence of the output laser, the lower the phase noise, and the smaller the dispersion in the transmission process, so that the resolution of the interferometer and the number of channels of optical fiber communication can be effectively improved, and the ultra-high precision, ultra-long distance and very weak signal measurement can be realized. However, since the gain of the pulse laser is far greater than the loss, the pulse laser cannot realize single-frequency output by using a long-time mode competition effect like a continuous laser by operating in a gain saturation state, and the duty ratio of the main mode must be continuously increased by increasing the mode loss difference and the laser round trip number in the laser pulse establishment process, so that higher spectral purity is achieved.
Therefore, in order to realize the generation of single-frequency pulse laser, three methods are generally adopted, namely, firstly, a single-frequency continuous laser is adopted, a mode loss difference is increased by inserting a mode selection element such as an etalon into a resonant cavity, but the mode loss difference brought by the method is insufficient to inhibit the generation of a secondary mode under high power, so that the pulse laser with high spectral purity cannot be obtained, and meanwhile, very large linear loss is brought. Secondly, the saturated absorber is utilized to passively adjust Q and select a mode, and the mode competition process of a main mode and a secondary mode is prolonged by increasing the establishment time of laser pulses, so that the generation of single-frequency pulse laser is realized. However, saturated absorbers bleach at high power laser outputs, losing the effect of increasing mode competition time, thereby reducing spectral purity. In the experiment, the saturated absorber needs to combine with the short cavity method to obtain single frequency output, and the external seed light is injected, so that the output power of single frequency pulse laser is improved to a certain extent, but under certain seed light power, the laser spectrum purity is also reduced along with the increase of the output power, and the method needs another laser as seed light, so that the complexity of the system is increased.
In general, the above methods are mainly based on linear modulation of loss or laser round trip times at pulse establishment to continuously improve the spectral purity of the output laser, and have problems of long action time and insufficient induced mode loss, which is difficult to obtain high spectral purity for the pulsed laser whose generation process itself is very short.
Disclosure of Invention
The application provides a single-frequency pulse laser with high spectral purity, which utilizes the characteristic that a nonlinear crystal in a nonlinear optical modulator has nonlinear effect in direct proportion to the square of laser light intensity and the sum frequency process generated in the nonlinear crystal to enlarge the loss difference between a main mode and a secondary mode, the proportion of the photon number of the main mode is increased, and simultaneously, the secondary mode is rapidly annihilated in a short time due to the higher oscillation light peak power brought by an optical pulse generating device and the mode competition of a gain medium, so that the single-frequency pulse laser output with high spectral purity is realized.
The application provides a single-frequency pulse laser with high spectral purity, which comprises a pump light processing system, an active resonant cavity, a gain medium, an optical pulse generating device and a nonlinear optical modulator, wherein the pump light processing system is connected with the active resonant cavity;
the gain medium is arranged on an emergent light path of an input mirror of the active resonant cavity, and the pump light processing system is used for coupling pump light into the gain medium;
The optical pulse generating device and the nonlinear optical modulator are both arranged in the active resonant cavity, the optical pulse generating device is used for adjusting the loss of the active resonant cavity so as to form pulse light, and the nonlinear optical modulator is used for rapidly increasing the loss difference between different modes in the resonant cavity so as to generate single-frequency pulse laser with high spectral purity;
the nonlinear optical modulator comprises a nonlinear crystal disposed in an optical path between the gain medium and an output mirror of the active resonator.
Preferably, the nonlinear optical modulator further comprises a precision temperature controller, wherein the precision temperature controller is used for controlling the temperature of the nonlinear crystal.
Preferably, the light pulse generating means is a Q-switched element.
Preferably, the active resonant cavity is a travelling wave cavity.
Preferably, the Q-switched element in the traveling wave cavity includes an acousto-optic crystal, an acousto-optic driver and a first signal generator, the acousto-optic crystal is disposed on an optical path between the gain medium and a first output mirror of the active resonant cavity, the acousto-optic driver is used for providing radio frequency signals for the acousto-optic crystal, and the first signal generator is used for controlling the acousto-optic driver to be turned on and off.
Preferably, the pump light treatment system comprises a pump light providing means and a pump light coupling system, both arranged outside the active resonator.
Preferably, a first plane mirror is arranged on the output light path of the active resonant cavity, and the first plane mirror is plated with a high-reflection film for fundamental frequency light and a high-transmission film for frequency doubling light and sum frequency light.
Preferably, the active resonant cavity is a standing wave cavity.
Preferably, the pump light treatment system is arranged within the active resonator.
Preferably, the nonlinear optical modulator is closer to the second output mirror of the active resonant cavity than the optical pulse generating device, and a second plane mirror is arranged between the optical pulse generating device and the nonlinear optical modulator, and is plated with a high-transmission film for fundamental frequency light and a high-reflection film for frequency doubling light and sum frequency light.
Other features of the present application and its advantages will become apparent from the following detailed description of exemplary embodiments of the application, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description, serve to explain the principles of the application.
FIG. 1 is a block diagram of a first embodiment of a high spectral purity single frequency pulsed laser provided by the present application;
FIG. 2 is a block diagram of a second embodiment of a high spectral purity single frequency pulse laser according to the present application
The figures are marked as follows:
1-pump light providing device, 2-pump light coupling system, 21-first convex lens, 22-second convex lens, 3-active resonant cavity, 31-third convex lens, 32-fourth convex lens, 33-third plane lens, 34-fourth plane lens, 35-gain medium, 36-isolator, 4-light pulse generating device, 41-acousto-optic crystal, 42-acousto-optic drive, 43-first signal generator, 5-nonlinear optical modulator, 51-nonlinear crystal, 52-precision temperature controller, 6-first plane lens, 7-frequency doubling light and sum frequency light, 8-fundamental frequency light, 9-active resonant cavity, 91-fifth plane lens, 92-fifth plane lens, 93-polarizing plate, 94-sixth plane lens, 95-pump light processing system, 951-gain medium, 952-semiconductor laser array, 10-light pulse generating device, 101-Prkerr box, 102-quarter wave drive, 103-high voltage drive, 104-signal generator, 5-frequency doubling light and sum frequency light, 8-fundamental frequency light and sum frequency light, 9-active resonant cavity, 91-fifth plane lens, 92-fifth plane lens, 93-polarizing plate, 94-sixth plane lens, 95-pump light processing system, 951-gain medium, 952-semiconductor laser array, 10-light pulse generating device, 101-Prkerr box, 102-quarter wave device, 103-high voltage drive, 104-high voltage generator, signal generator, 5-voltage generator, 5-nonlinear optical modulator, and 12-plane light and frequency doubling light and frequency-band light.
Detailed Description
Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise.
The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the application, its application, or uses.
Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods, and apparatus should be considered part of the specification.
In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of exemplary embodiments may have different values.
The application provides a single-frequency pulse laser with high spectral purity, which utilizes the characteristic that a nonlinear crystal in a nonlinear optical modulator has nonlinear effect in direct proportion to the square of laser light intensity and the sum frequency process generated in the nonlinear crystal to enlarge the loss difference between a main mode and a secondary mode, the proportion of the photon number of the main mode is increased, and simultaneously, the secondary mode is rapidly annihilated in a short time due to the higher oscillation light peak power brought by an optical pulse generating device and the mode competition of a gain medium, so that the single-frequency pulse laser output with high spectral purity is realized.
The application provides a high-spectral purity single-frequency pulse laser which comprises a pump light processing system, an active resonant cavity, a gain medium, an optical pulse generating device and a nonlinear optical modulator.
The gain medium is arranged on the emergent light path of the input mirror of the active resonant cavity, and the pump light processing system is used for coupling pump light into the gain medium. The optical pulse generating device and the nonlinear optical modulator are both arranged in the active resonant cavity, the optical pulse generating device is used for adjusting the loss of the active resonant cavity so as to form pulse light, and the nonlinear optical modulator is used for rapidly increasing the loss difference between different modes in the resonant cavity so as to generate single-frequency pulse laser with high spectral purity.
In the application, the cavity structure of the active resonant cavity can be a simple two-mirror resonant cavity or a multi-mirror folded cavity. The active resonant cavity may be a standing wave cavity or a traveling wave cavity.
In the present application, the gain medium may have a structure of a rod, a slab, a disc, a single crystal optical fiber, or an optical fiber.
As one example, the gain medium is a laser crystal.
As shown in fig. 1, the nonlinear optical modulator 5 includes a nonlinear crystal 51 and a precision temperature controller 52. The nonlinear crystal 51 is disposed on the optical path between the gain medium and the output mirror of the active resonant cavity, and is used for introducing nonlinear loss and realizing stable single-frequency operation of the laser. The precision temperature controller 52 is used for controlling the temperature of the nonlinear crystal 51. When nonlinear frequency conversion is performed, the precise temperature controller 52 regulates and controls the phase matching condition of the nonlinear crystal 51, so that the secondary mode can be quickly annihilated in a short time, and single-frequency pulse laser output is realized.
Alternatively, nonlinear crystal 51 includes, but is not limited to, lithium triborate crystal (LBO), barium metaborate (BBO), potassium titanyl phosphate (KTP), and periodically poled crystal.
As an example, the nonlinear crystal 51 is a lithium triborate crystal of a rod-like structure, and has a size of 3×3×20× 20 mm 3.
As an example, the optical pulse generator is a Q-switching element, and the Q-switching mode may be acousto-optic Q-switching, electro-optic Q-switching, saturated absorber Q-switching, or mechanical Q-switching.
Fig. 1 is a block diagram of one embodiment of a high spectral purity single frequency pulsed laser of the present application. As shown in fig. 1, the first active resonant cavity 3 is a traveling wave cavity, and the first optical pulse generating device 4 is an acousto-optic Q-switched element. The pump light processing system comprises a pump light providing device 1 and a pump light coupling system 2, both arranged outside the first active resonator 3. The pump light providing means 1 is arranged to provide pump light and the pump light coupling system 2 is arranged to couple pump light into the first gain medium 35 of the laser resonator.
The pump light providing device 1 is a laser, including but not limited to a semiconductor laser, a solid state laser, a gas laser, a dye laser, and an excimer laser.
As an embodiment, the pump optical coupling system 2 is an end-pumped module comprising a first plano-convex mirror 21 and a second plano-convex mirror 22. The first plano-convex mirror 21 and the second plano-convex mirror 22 form a telescope system for realizing mode matching of pump light and an active resonant cavity mode.
In the high-spectral-purity single-frequency pulse laser shown in fig. 1, the first active resonant cavity 3 includes a third plano-convex mirror 31, a fourth plano-convex mirror 32, a third plano-mirror 33, and a fourth plano-mirror 34 sequentially arranged along an optical path, where the third plano-convex mirror 31 is a first input mirror, and the fourth plano-mirror 34 is a first output mirror. The first gain medium 35 is disposed on the optical path between the third plano-convex mirror 31 and the fourth plano-convex mirror 32, and the isolator 36 is disposed centrally on the optical path between the third plano-mirror 33 and the fourth plano-mirror 34. The output light path of the first active resonant cavity 3 is provided with a first plane mirror 6, and the first plane mirror 6 is plated with a high reflection film for fundamental frequency light and a high transmission film for frequency multiplication light and sum frequency light. The fourth plane mirror 34 is coated with a film having a certain transmittance for the fundamental frequency light and is coated with a high-transmittance film for the frequency doubling light and the sum frequency light, so that after a part of the fundamental frequency light, all the frequency doubling light and the sum frequency light are transmitted out through the fourth plane mirror 34, the fundamental frequency light is reflected by the first plane mirror 6 to form a first light beam 8, and high-spectrum purity single-frequency pulse laser is obtained. The frequency-doubled light and the frequency-summed mirror first plane mirror 6 are transmitted to form a second light beam 7.
Preferably, isolator 36 is comprised of an optical rotator and a half wave plate.
In this embodiment, the first gain medium 35 has a rod-like structure with a size of 3×3×20× 20 mm 3.
As shown in fig. 1, the first light pulse generating device 4 and the nonlinear optical modulator 5 are disposed on the optical path between the third plane mirror 33 and the fourth plane mirror 34, the first light pulse generating device 4 being close to the third plane mirror 33, and the nonlinear optical modulator 5 being close to the fourth plane mirror 34.
As an embodiment, as shown in fig. 1, the first optical pulse generating device 4 includes an acousto-optic crystal 41, an acousto-optic driver 42, and a first signal generator 43, where the acousto-optic crystal 41 is disposed on an optical path between the third plane mirror 33 and the isolator 36, the acousto-optic driver 42 is used to provide a radio frequency signal to the acousto-optic crystal 41, and the first signal generator 43 is used to control the acousto-optic driver 42 to be turned on and off.
As shown in fig. 1, a nonlinear crystal 51 is disposed on the optical path between the isolator 36 and the fourth plane mirror 34.
It will be appreciated that in this embodiment the positions of the first light pulse generating means 4 and the nonlinear optical modulator 5 may be interchanged.
Fig. 2 is a block diagram of another embodiment of a high spectral purity single frequency pulsed laser of the present application. As shown in fig. 2, the second active resonant cavity 9 is a standing wave cavity, and the second optical pulse generating device 10 is an electro-optical Q-switching element. The pump light processing system is arranged in the active resonant cavity.
Specifically, the second active resonant cavity 9 includes a fifth plano-convex mirror 91, a fifth plano-mirror 92, a polarizing plate 93, and a sixth plano-mirror 94, which are disposed in order along the optical path. The fifth plano-convex mirror 91 is a second input mirror, and the sixth plano-convex mirror 94 is a second output mirror. The fifth plane mirror 92 and the polarizing plate 93 function as light guides.
As shown in fig. 2, the pump light processing system is a semiconductor laser array 952, which is disposed on the optical path between the fifth plano-convex mirror 91 and the fifth plano-mirror 92. The semiconductor laser array 952 and the second gain medium 951 are packaged together, and the semiconductor laser array 952 is laterally pumped around the second gain medium 951.
The nonlinear optical modulator 5 is closer to the second output mirror of the second active resonator 9 than the second light pulse generating means 10. As shown in fig. 2, the second light pulse generating device 10 includes a pockels cell 101, a quarter wave plate 102, a polarizing plate 93, an electro-optical driver 103, and a second signal generator 104. A quarter wave plate 102 and a pockels cell 101 are sequentially arranged on the optical path between the polarizing plate 93 and the sixth plane mirror 94, an electro-optical driver 103 is used for controlling the voltage value applied to the pockels cell 101, and a second signal generator 104 is used for controlling the electro-optical driver 103 to be turned on and off.
The polarizer 93 is not only a light guide lens of the active resonant cavity, but also forms an optical part of the electro-optic Q-switching element together with the pockels cell 101 and the quarter wave plate 102, and the linear polarized light reflected by the polarizer 93 passes through the quarter wave plate 102 and the pockels cell 101 twice after being reflected by the sixth plane mirror 94, and at this time, the polarization direction of the light beam incident on the polarizer 93 can be controlled by the voltage applied to the pockels cell 101, so that the Q value of the active resonant cavity can be actively controlled.
As shown in fig. 2, a second plane mirror 11 is provided between the second light pulse generating device 10 and the nonlinear optical modulator 5, and the second plane mirror 11 is coated with a high-transmission film for fundamental frequency light and a high-reflection film for frequency-doubled light and frequency-summed light. The frequency-multiplied light and the frequency-summed light are reflected by the second plane mirror 11 to form a third light beam 13. The sixth plane mirror 94 is coated with a partially transmissive film for the fundamental frequency light, and thus the fundamental frequency light is output through the sixth plane mirror 94 to form the fourth light beam 12, thereby obtaining a single-frequency pulse laser of high spectral purity.
The working principle of the application is as follows:
After the pump light is injected into the active resonant cavity (3 or 9), high-power oscillation light is generated through the gain medium, and the oscillation fundamental frequency light, non-oscillation frequency doubling light and sum frequency light exist in the resonant cavity at the same time. The oscillating light generated by the active resonant cavity (3 or 9) is subjected to the Q-switching action of the optical pulse generating device (4 or 10) to form pulsed light. In the process of forming the pulse light, when the temperature (or angle) of the nonlinear crystal 51 in the nonlinear optical modulator 5 is regulated to reach the phase matching condition, the nonlinear effect of the nonlinear crystal 51 is proportional to the square of the laser light intensity, and the nonlinear loss of the resonant cavity increases sharply along with the establishment of the oscillation light in the resonant cavity. At the same time, the optical frequency transformation occurring within the nonlinear crystal 51 causes the losses of photons of different oscillation modes within the resonator to vary considerably. Specifically, when the secondary mode photon and the primary mode photon pass through the nonlinear crystal 51 at the same time, since the frequencies of the primary mode photon and the secondary mode photon are almost identical (relative to the receiving bandwidth of the nonlinear crystal 51), they have the same nonlinear optical conversion efficiency, and therefore the number of photons consumed when the photons between the different modes are summed in the nonlinear crystal 51 is the same. However, since the fundamental number of the main analog photon number is larger than that of the sub-analog photon number, the specific gravity of the main analog photon number after passing through the nonlinear crystal and the sub-analog photon number is further increased, and the specific gravity of the sub-analog photon number is gradually decreased, that is, the sum frequency effect between different modes in the nonlinear crystal 51 further increases the loss difference between the main mode and the sub-mode. For the optical pulse generating device (4 or 10), the peak power of the oscillating light in the resonant cavity can reach kilowatt magnitude or even megawatt within a few nanoseconds, and the nonlinear effect caused at the moment is very strong, so that the high efficiency of increasing the loss difference of the primary mode and the secondary mode by using the nonlinear effect is further ensured. Meanwhile, when the mode loss difference caused by the nonlinear effect makes the proportion of the main mode photon number continuously rise, obvious mode competition effect exists in the gain medium. For mode competition, the energy extracted by the primary mode photons in the gain medium will also be greater than the secondary mode photons, further emphasizing the proportion of the primary mode photons. Finally, by utilizing the uniqueness that the nonlinear effect of the nonlinear crystal 51 is proportional to the square of the laser light intensity and combining the higher peak power of the optical pulse generating device, the weaker secondary mode can be quickly annihilated in a shorter time through the sum frequency process between the primary mode and the secondary mode, so that the single-frequency pulse laser output with high spectral purity is realized.
The application utilizes the characteristics of large mode loss difference and quick response time caused by nonlinear loss, thereby avoiding the problems of lower output power of a laser, low spectral purity caused by the influence of factors such as ambient temperature, mechanical vibration and the like due to the fact that the mode selection element is inserted into the resonant cavity, solving the problem of lower spectral purity during the output of high-power pulse laser, greatly improving the spectral purity and stability of high-power single-frequency pulse laser, and having higher practical value.
While certain specific embodiments of the application have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the application. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the application. The scope of the application is defined by the appended claims.
Claims (10)
1. The single-frequency pulse laser with high spectral purity is characterized by comprising a pump light processing system, an active resonant cavity, a gain medium, an optical pulse generating device and a nonlinear optical modulator;
the gain medium is arranged on an emergent light path of an input mirror of the active resonant cavity, and the pump light processing system is used for coupling pump light into the gain medium;
The optical pulse generating device and the nonlinear optical modulator are both arranged in the active resonant cavity, the optical pulse generating device is used for adjusting the loss of the active resonant cavity so as to form pulse light, and the nonlinear optical modulator is used for rapidly increasing the loss difference between different modes in the resonant cavity so as to generate single-frequency pulse laser with high spectral purity;
The nonlinear optical modulator comprises a nonlinear crystal arranged on an optical path between the gain medium and an output mirror of the active resonant cavity.
2. The high spectral purity single frequency pulsed laser of claim 1 wherein the nonlinear optical modulator further comprises a precision temperature controller for temperature controlling the nonlinear crystal.
3. The high spectral purity single frequency pulse laser of claim 1 wherein the optical pulse generating means is a Q-switched element.
4. A high spectral purity single frequency pulsed laser according to claim 3 wherein the active resonant cavity is a traveling wave cavity.
5. The high spectral purity single frequency pulse laser of claim 4 wherein the Q-switched element in the traveling wave cavity comprises an acousto-optic crystal disposed in the optical path between the gain medium and the first output mirror of the active cavity, an acousto-optic driver for providing a radio frequency signal to the acousto-optic crystal, and a first signal generator for controlling the acousto-optic driver to turn on and off.
6. The high spectral purity single frequency pulsed laser of claim 4 wherein the pump light processing system comprises a pump light providing device and a pump light coupling system both disposed outside the active cavity.
7. The high-spectral-purity single-frequency pulse laser according to claim 4, wherein a first plane mirror is disposed on an output optical path of the active resonant cavity, and the first plane mirror is coated with a high reflection film for fundamental frequency light and a high transmission film for frequency multiplication light and sum frequency light.
8. A high spectral purity single frequency pulsed laser according to claim 3 wherein the active resonant cavity is a standing wave cavity.
9. The high spectral purity single frequency pulsed laser of claim 8 wherein the pump light processing system is disposed within the active cavity.
10. The high spectral purity single frequency pulse laser according to claim 8 wherein the nonlinear optical modulator is closer to the second output mirror of the active resonator than the optical pulse generating device, a second planar mirror is disposed between the optical pulse generating device and the nonlinear optical modulator, and the second planar mirror is coated with a high transmission film for fundamental frequency light and a high reflection film for frequency doubling light and sum frequency light.
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| CN103296577A (en) * | 2013-05-22 | 2013-09-11 | 北京工业大学 | kHz green ray picosecond laser device used for satellite distance measurement |
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