CN114447747A - A dual wavelength laser - Google Patents

Abstract

The invention discloses a dual-wavelength laser, wherein a laser gain module is positioned in a laser resonant cavity part and used for generating a first wavelength laser and a second wavelength laser; the laser resonant cavity component is used for outputting the first wavelength laser and the second wavelength laser generated by the laser gain module in an oscillating way; the power supply controller is respectively connected with the first gain module and the second gain module and is used for independently controlling the generation and the closing of the first wavelength laser and the second wavelength laser; controlling the current input into the first gain module and the second gain module, and independently or simultaneously adjusting the output power of the first wavelength laser and the second wavelength laser; and the water cooling system covers the side part of the laser gain module and is used for cooling the laser gain module. The dual-wavelength laser can independently adjust the on-off and the power of the first wavelength laser and the second wavelength laser.

Description

A dual wavelength laser

technical field

The invention relates to the field of lasers, in particular to a dual-wavelength laser applied to minimally invasive surgery.

Background technique

Laser has high monochromaticity, high directivity, high brightness and good coherence. In medicine, it mainly uses the characteristics of high brightness and high directionality of lasers. The laser controls the size of the focused spot through the lens and changes the power density, so that the temperature at a certain point of the human body can reach up to 200 ° C - 1000 ° C, and in a very short time (0.1-10ms), the diseased tissue is solidified, decomposed, and even melted and vaporized. . The laser moves at a certain speed instead of the traditional surgical scalpel to gasify and cut various soft and hard diseased tissues of the human body. Compared with traditional surgery, it has the characteristics of high precision, sterility, small wound, and ready fusion.

At present, most of the laser light sources used in laser internal surgery are single-wavelength lasers, which can only achieve the function of surgical cutting, but do not have the function of hemostasis, so it will cause large surgical scabs and slow healing.

In the application of laser medical surgery, it is required that the laser source can output two wavelengths at the same time and can realize the independent adjustment of the laser power of each wavelength, respectively corresponding to the cutting and hemostasis in the laser medical surgery. This will greatly improve the flexibility of surgical treatment, and solve the problems of difficult hemostasis, large surgical scabs, and long recovery period during cutting operations. Dual-wavelength laser surgery will be more and more widely used in the field of internal medicine and clinical medicine in the future. It is different from traditional laser surgery and has the characteristics of environmental protection, safety, small dust and low noise. The existing composite wavelength minimally invasive laser medical equipment is mostly realized by spectral beam combining and "dual light source coupling". Dual wavelength output. Because it contains two separate lasers, the structure is complex, bulky and low in stability.

SUMMARY OF THE INVENTION

The invention provides a dual-wavelength laser, which can generate lasers with two wavelengths through a laser resonant cavity, and realize independent control of the on-off and power of the two-wavelength lasers. The specific implementation is as follows:

A dual-wavelength laser includes a laser resonant cavity component, a laser gain module, a water cooling system and a power supply controller; the laser gain module, located inside the laser resonant cavity component, includes a first gain module for generating a first wavelength laser, The second gain module is used to generate the second wavelength laser light; the laser resonant cavity component is used to oscillate the first wavelength laser light and the second wavelength laser light generated by the laser gain module; the power supply controller is respectively connected with The first gain module is connected to the second gain module and supplies power to it, and is used to independently control the generation and closing of the first wavelength laser and the second wavelength laser; control the input to the first gain module and the second gain module. The current can adjust the output power of the first wavelength laser and the second wavelength laser independently or simultaneously; the water cooling system covers the side of the laser gain module and is used to provide cooling for the laser gain module.

Further, the first gain module includes a first LD and a first crystal, the first LD is located on the side of the first crystal, and is used for pumping the first crystal, and the first crystal is stimulated to emit radiation , to generate a first wavelength laser; the second gain module includes a second LD and a second crystal, the second LD is located on the side of the second crystal, and is used for pumping the second crystal, the first Two-crystal stimulated radiation produces a second wavelength of laser light.

Further, the laser resonant cavity component specifically includes: a high-reflection mirror and an output mirror arranged in sequence; the high-reflection mirror is coated with a reflective film with a preset reflectivity for the first wavelength laser and the second wavelength laser, used to reflect the first wavelength laser and the second wavelength laser; the output mirror is coated with a transmission film with preset transmittance for the first wavelength laser and the second wavelength laser, and is used to output the first wavelength laser and the second wavelength laser laser light; the first wavelength laser light and the second wavelength laser light respectively form a resonance output between the high reflection mirror and the output mirror.

Further, the left end of the first crystal is coated with a high-reflection film with preset reflectivity for the first wavelength laser and the second wavelength laser to form a mirror; the right end of the second crystal is A transmission film with preset transmittance for the first wavelength laser and the second wavelength laser is plated to form an output mirror, and a laser resonant cavity component is formed between the reflecting mirror and the output mirror, and the first The wavelength laser and the second wavelength laser form a resonant output inside the resonant cavity part.

Further, the laser resonator component further includes a laser polarization control element, located on the optical path between the high-reflection mirror and the output mirror, for controlling the polarization characteristics of the laser; and/or a laser modulation element, located in the The optical path between the high-reflection mirror and the output mirror is used to control the time-domain characteristics of the laser to make the laser pulse work.

Further, the dual-wavelength laser further includes an indicator light coupling part for coupling the indicator light with the first wavelength laser and the second wavelength laser.

Further, the indicating light is red light.

Further, the dual-wavelength laser further includes a fiber coupling part for coupling the first wavelength laser light, the second wavelength laser light and the indicator light into the fiber.

Further, the first wavelength laser is 1 μm, and the second wavelength laser is 2 μm.

Further, the wavelength of the first LD is 783 nm, and correspondingly, the first crystal is Tm:YAG; the wavelength of the second LD is 808 nm, and correspondingly, the second crystal is Nd:YAG.

The first gain module and the second gain module in the present invention only include one LD and one crystal, and both share a laser resonant cavity component, so that the first wavelength laser and the second wavelength laser can be generated, which is different from the prior art. Compared with the laser that generates composite wavelengths, the structure is simpler, the volume is smaller, and it is easy to use. And in the solution of the present invention, the generation and closing of the first wavelength laser and the second wavelength laser can be independently controlled by the power supply control component, and further, the currents input to the first gain module and the second gain module are different through the power supply controller, so as to realize the first Power regulation of a gain block and a second gain block. The first wavelength laser and the second wavelength laser in the present invention respectively realize the cutting and hemostasis in the operation, the hemostasis is faster, and the trauma of the operation is smaller.

Description of drawings

1 is a schematic structural diagram of a dual-wavelength laser in an embodiment of the present invention;

2 is a schematic diagram of a specific structure of a laser in an embodiment of the present invention;

3 is a schematic structural diagram of a preferred embodiment of a dual-wavelength laser in an embodiment of the present invention;

4 is a schematic structural diagram of a first gain module and a second gain module in an embodiment of the present invention;

5 is a schematic structural diagram of a laser in a preferred embodiment of the present invention;

6 is a schematic structural diagram of a laser in another embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a laser in another preferred embodiment of the present invention.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the specific embodiments and the accompanying drawings. It should be understood that these descriptions are exemplary only and are not intended to limit the scope of the invention. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concepts of the present invention.

A schematic diagram of the structure of a semiconductor laser according to an embodiment of the present invention is shown in the accompanying drawings. The figures are not to scale, some details are exaggerated for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the figures, as well as their relative sizes and positional relationships are only exemplary, and in practice, there may be deviations due to manufacturing tolerances or technical limitations, and those skilled in the art should Regions/layers with different shapes, sizes, relative positions can be additionally designed as desired.

The invention provides a dual-wavelength laser, which can realize dual-wavelength laser output only through a laser resonant cavity component and a laser gain module, and can control the generation and shutdown of each wavelength of laser through a power supply controller, and control the input The current of the laser gain module realizes the power adjustment of each wavelength of the laser. As shown in FIG. 1 , the dual-wavelength laser includes a laser resonator component 1 , a laser gain module 3 , a power controller 2 and a water cooling system (not shown), wherein the laser gain module 3 is provided in the laser resonator Inside the component 1, it is used to generate and output dual-wavelength laser light, the dual-wavelength laser light is respectively a first wavelength laser light and a second wavelength laser light; the power supply controller 2 controls the power on and off of the laser gain module 3 to achieve Independent output control of the first wavelength laser and the second wavelength laser; by adjusting the current input to the laser gain module 3, the powers of the first wavelength laser and the second wavelength laser are respectively controlled. The higher the current, the higher the power accordingly. The water cooling system covers the side of the laser gain module and is used to provide cooling for the laser gain module.

Specifically, as shown in FIG. 2 , the laser resonator component 1 includes a high-reflection mirror 1-1 and an output mirror 1-2 arranged in sequence, and the laser gain module 3 is located inside the laser resonator, and specifically includes a first gain Module 3-1, second gain module 3-2, wherein, the high-reflection mirror 1-1 is an independent element, which is coated with a reflective film with a preset reflectivity. Preferably, the reflective film is coated near the On the side of the first gain module 3-1, the output mirror 1-2 is an independent element, which is coated with a transmission film with a preset transmittance. Preferably, the transmission film is coated near the second gain module 3- 2 side.

Further, the reflectivity of the reflective film on the high-reflection mirror 1-1 can be preset as required. In the embodiment of the present invention, the reflectivity is 100%, and the transmission film on the output mirror 1-2 The transmittance of can be preset as required, and in this embodiment of the present invention, the transmittance is 20%.

The first gain module 3-1 generates the first wavelength laser light, transmits it to the high-reflection mirror 1-1, is reflected by the high-reflection mirror 1-1 and reaches the output mirror 1-2, and outputs through the output mirror 1-2, the output mirror A resonance for the first wavelength laser is formed between 1-2 and the high-reflection mirror 1-1; correspondingly, the second gain module 3-2 generates a second wavelength laser, which is transmitted to the high-reflection mirror 1-1, and then passes through the high-reflection mirror. 1-1 reaches the output mirror 1-2 after being reflected, and is output through the output mirror 1-2, and a resonance for the second wavelength laser light is formed between the output mirror 1-2 and the high-reflection mirror 1-1.

The first wavelength laser and the second wavelength laser output by the present invention are applied in the medical field, and a certain medium is required to guide the laser light. In the embodiment of the present invention, as shown in FIG. 3 , the dual-wavelength laser further includes a fiber coupling Component 4, the fiber coupling component 4 is located at one end of the laser output of the laser resonator component 1, and is used for coupling the outputted first wavelength laser and second wavelength laser into the optical fiber.

Further, in order to enable the user to observe the output laser with the naked eye and facilitate the operation of the laser, a specific indicator light can be coupled. As shown in FIG. 3 , the dual-wavelength laser further includes an indicator light coupling component 5. In this embodiment of the present invention Among them, the indicating light is red light, and the indicating light coupling component 5 is located between the laser output end of the laser resonator component 1 and the optical fiber coupling component 4 . After the indicator light coupling part 5 couples the red light into the first wavelength laser and the second wavelength laser, it is coupled into the optical fiber by the optical fiber coupling part 4 and exported.

In a specific embodiment, the structures of the first gain module 3-1 and the second gain module 3-2 are shown in FIG. 4 , and the first gain module 3-1 includes a first LD 3-11 and a second gain module 3-1. A crystal 3-12, the first LD 3-11 is located on the side of the first crystal 3-12 for pumping the first crystal 3-12, the first crystal 3-12 Stimulated radiation generates a first wavelength laser, the second gain module 3-2 includes a second LD 3-21 and a second crystal 3-22, the second LD 3-21 is located in the second crystal 3-22 The side part is used for pumping the second crystal 3-22, and the second crystal 3-22 is stimulated to emit laser light of the second wavelength. According to different wavelengths of the laser light to be output, the first gain module 3-1 and the second gain module 3-2 can select LDs with different wavelengths and crystals with different structures.

The first LD 3-11 in the first gain module 3-1 pumps the first crystal 3-12, and the first crystal 3-12 is stimulated to emit laser light of the first wavelength, which is reflected by the high-reflection mirror and passes through the first wavelength. After the two gain modules 3 - 2 are outputted through the output mirror, and coupled with the indicating light through the indicating light coupling part 5 , they are coupled into the optical fiber through the optical fiber coupling part 4 . If the power supply controller 2 stops supplying power to the first gain module 3-1, the output of the first wavelength laser light is stopped.

The working process of the second wavelength gain module 3-2 is similar to that of the first gain module 3-1, and details are not described herein again.

In a specific embodiment, the wavelength of the first LD 3-11 in the first gain module 3-1 is 783 nm, the corresponding first crystal 3-12 is Tm: YAG, and the second gain module 3- The second LD 3-21 in 2 has a wavelength of 808 nm, and the corresponding second crystal 3-22 is an Nd:YAG crystal. The power supply controller 2 supplies power to the first gain module 3-1, and the first LD 3-11 in the first gain module 3-1 pumps the Tm: YAG crystal, and the generated first wavelength laser is 2 μm wavelength laser, 2 μm wavelength laser Reflected by the high-reflection mirror 1-1, after passing through the first gain module 3-1 and the second gain module 3-2, it reaches the output mirror 1-2, where the high-reflection mirror 1-1 and the output mirror 1- Resonance for 2 μm wavelength laser light is formed between 2, and the first wavelength laser light with 2 μm wavelength is output through the output mirror 1-2. The high-reflection film coated on the high-reflection mirror 1-1 reflects 100% of the laser light with wavelengths of 2 μm and 1 μm at the same time, and the transmission film coated on the output mirror 1-2 simultaneously reflects the wavelengths of 2 μm and 1 μm. Preset ratio transmission. Similarly, the power supply controller 2 supplies power to the second gain module 1-2, the second LD3-21 in the second gain module 3-2 pumps the Nd:YAG crystal, and the second wavelength laser generated is a 1 μm wavelength laser , after the 1 μm wavelength laser passes through the first gain module 3-1, it is reflected by the high-reflection mirror 1-1, and then passes through the first gain module 3-1 and the second gain module 3-2 again, and then reaches the output mirror 1-2. , a resonance for the 1 μm wavelength laser light is formed between the high-reflection mirror 1-1 and the output mirror 1-2, and the second wavelength laser light with a 1 μm wavelength is output through the output mirror 1-2. It can be understood that the power controller 2 controls the generation and stop of the 1 μm wavelength laser and the 2 μm wavelength laser respectively by controlling the power on and off of the first gain module 3-1 and the second gain module 3-2. There is only one LD and a crystal in the first gain module 3-1 and the second gain module 3-2 respectively, and the first wavelength laser and the second wavelength laser are resonated in one laser resonant cavity part 1, the overall structure is simple, and the volume is small. Small, easy to control, and high stability.

As shown in FIG. 3 and FIG. 4 , the 1 μm wavelength laser and the 2 μm wavelength laser are respectively coupled with the indicator light through the indicator light coupling part 5 , and further coupled into the optical fiber through the optical fiber coupling part 4 , so that the laser output through the optical fiber is visible, and The output 1μm wavelength laser can be used for hemostasis, and the output 2μm wavelength laser can be used for cutting.

Further, as shown in FIG. 5 , the laser resonator component 1 of the dual-wavelength laser further includes a laser polarization control element 1-3 and a laser modulation element 1-4; wherein, the laser polarization element 1-3 is located in the The optical path between the high-reflection mirror and the output mirror, in this embodiment, is: located between the first gain module and the second gain module, or located outside the first gain module and the second gain module , here, the outside is the end of the first gain module away from the second gain module, or the end of the second gain module away from the first gain module, for adjusting the polarization of the first wavelength laser and the second wavelength laser state, and control its polarization characteristics. According to actual needs, the laser polarization control element can be a polarizer or the like. The laser modulation elements 1-4 are located on the optical path between the high-reflection mirror and the output mirror, and can be electro-optical switching or acousto-optical switching, used to control the time domain characteristics of the first wavelength laser and the second wavelength laser , forming pulsed light so that the laser can work in pulses. In the present invention, the laser polarization control element 1-3 and the laser modulation element 1-4 can be used simultaneously or independently. When used simultaneously, the laser polarization control element 1-3 and the laser modulation element 1-4 positions can be interchanged.

In another embodiment, as shown in FIG. 6 , the laser gain module 3 includes a first gain module 3-1 and a second gain module 3-2, and the first gain module 3-1 further includes a first LD 3- 11 and a first crystal 3-12, wherein the first LD 3-11 is located at the side of the first crystal 3-12, and the high-reflection film is coated on the far side of the first crystal 3-12. The end (not shown) on one side of the second gain module 3-2, that is, the left end, forms the high-reflection mirror 1-1 of the laser resonator component 1. The reflectivity of the laser light of the second wavelength is preset as required, and is 100% in the embodiment of the present invention. The second gain module 3-2 further includes a second LD 3-21 and a second crystal 3-22, wherein the The transmissive film is coated on the end (not shown) of the second crystal 3-22 on the side away from the first gain module 3-1, that is, the right end, forming the laser cavity part 1. The output mirror 1-2, the transmittance of the transmission film to the first wavelength laser and the second wavelength laser is preset according to needs, in the embodiment of the present invention, it is 20%. It can be understood that in the first gain module 3-1 The first LD 3-11 pumps the first crystal 3-12, the first crystal 3-12 is stimulated to emit a first wavelength laser, and the first wavelength laser passes through the left end of the first crystal 3-12 After being reflected by the high-reflection film of the first gain module 3-2, it is emitted from the right end of the second gain module 3-2, and the high-reflection film at the left end of the first gain module 3-1 and the right end of the second gain module 3-2 A resonance for the first wavelength laser is formed between the transmissive films at the side ends, and the first wavelength laser is output from the right end of the second gain module 3-2; similarly, in the second gain module 3-2, the The second crystal 3-22 corresponding to the second LD 3-21 is pumped, and the second crystal 3-22 is stimulated to emit a second wavelength laser light, and the second wavelength laser light passes through the first gain module 3-1 The high-reflection film at the left end is reflected and transmitted through the right end of the second gain module 3-2, and the high-reflection film at the left end of the first gain module 3-1 and the right end of the second gain module 3-2 Resonance for the second wavelength laser light is formed between the transmissive films at the side end portions, and the second wavelength laser light is output from the right end portion of the second gain module 3-2.

As a preferred embodiment, as shown in FIG. 7 , the laser resonator component 1 of the dual-wavelength laser further includes a laser polarization control element 1-3 and a laser modulation element 1-4; wherein, the laser polarization element 1 -3 is located on the optical path between the high-reflecting mirror and the reflecting mirror. In this embodiment, it is located between the first gain module and the second gain module, and is used to adjust the first wavelength laser and the second gain module. The polarization state of the two-wavelength laser can be controlled to control its polarization characteristics. According to actual needs, the laser polarization control element can be a polarizer or the like. The laser modulation element 1-4 is located on the optical path of the high-reflection mirror and the reflector, in this embodiment, it is located in the first gain module 3-1 and the second gain module 3-2 In between, it is used to control the time domain characteristics of the first wavelength laser and the second wavelength laser to form pulsed light, so that the lasers can work in pulses. In the present invention, the laser polarization control element 1-3 and the laser modulation element 1-4 can be used simultaneously or independently. When used simultaneously, the laser polarization control element 1-3 and the laser modulation element 1-4 positions can be interchanged.

As a preferred embodiment, as shown in FIG. 7 , the dual-wavelength laser further includes a fiber coupling part 4, so as to couple the first wavelength laser and the second wavelength laser into the fiber and export it.

As a preferred embodiment, as shown in FIG. 7 , the dual-wavelength laser further includes an indicator light coupling part 3, which is located between the output end of the laser resonator part 1 and the fiber coupling part 4, and is used for coupling the indicator light, The first wavelength laser light and the second wavelength laser light are coupled into the fiber and out.

It should be understood that the above-mentioned specific embodiments of the present invention are only used to illustrate or explain the principle of the present invention, but not to limit the present invention. Therefore, any modifications, equivalent replacements, improvements, etc. made without departing from the spirit and scope of the present invention should be included within the protection scope of the present invention.

Claims (10)

1. a dual-wavelength laser, is characterized in that, comprises laser resonant cavity component, laser gain module, water cooling system and power supply controller; The laser gain module, located inside the laser resonator component, includes a first gain module for generating the first wavelength laser light, and a second gain module for generating the second wavelength laser light; The laser resonator component is used to oscillate the first wavelength laser and the second wavelength laser generated by the laser gain module; The power supply controller is respectively connected to the first gain module and the second gain module, and supplies power to them, and is used to individually control the generation and shutdown of the first wavelength laser and the second wavelength laser; the control input is the first The currents of the gain module and the second gain module independently or simultaneously adjust the output power of the first wavelength laser and the second wavelength laser; The water cooling system covers the side of the laser gain module and is used to provide cooling for the laser gain module. 2. The dual-wavelength laser according to claim 1, characterized in that, The first gain module includes a first LD and a first crystal, the first LD is located on the side of the first crystal, and is used for pumping the first crystal, and the first crystal is stimulated to emit radiation to generate the first crystal. one wavelength laser; The second gain module includes a second LD and a second crystal, the second LD is located on the side of the second crystal, and is used for pumping the second crystal, and the second crystal stimulated radiation generates a first Two-wavelength laser. 3. The dual-wavelength laser according to claim 2, characterized in that, The laser resonator component specifically includes: a high-reflection mirror and an output mirror, which are arranged in sequence; The high-reflection mirror is coated with a reflective film with preset reflectivity for the first wavelength laser and the second wavelength laser, for reflecting the first wavelength laser and the second wavelength laser; The output mirror is coated with a transmission film with preset transmittance for the first wavelength laser and the second wavelength laser, so as to output the first wavelength laser and the second wavelength laser; The first wavelength laser light and the second wavelength laser light respectively form a resonance output between the high reflection mirror and the output mirror. 4. The dual-wavelength laser according to claim 2, wherein the left end of the first crystal is plated with a high-reflection film with preset reflectivity for the first-wavelength laser and the second-wavelength laser. a reflection mirror; the right end of the second crystal is coated with a transmission film with preset transmittance for the first wavelength laser and the second wavelength laser to form an output mirror, A laser resonator part is formed between the reflection mirror and the output mirror, and the first wavelength laser and the second wavelength laser form a resonant output inside the resonator part. 5. The dual-wavelength laser according to claim 3 or 4, wherein the laser resonator component further comprises a laser polarization control element, located on the optical path between the high-reflection mirrors or the output mirrors, for control the polarization characteristics of the laser; and/or The laser modulation element is located on the optical path between the high-reflection mirrors or the output mirrors, and is used to control the time-domain characteristics of the laser to make the laser pulse work. 6 . The dual-wavelength laser according to claim 1 , wherein the dual-wavelength laser further comprises an indicator light coupling component for coupling the indicator light with the first wavelength laser and the second wavelength laser. 7 . 7. The dual-wavelength laser according to claim 6, wherein the indicator light is red light. 8 . The dual-wavelength laser of claim 7 , wherein the dual-wavelength laser further comprises a fiber coupling component for coupling the first wavelength laser light, the second wavelength laser light and the indicator light into the fiber. 9 . 9. The dual-wavelength laser according to any one of claims 1 or 2, characterized in that, The first wavelength laser is 1 μm, and the second wavelength laser is 2 μm. 10 . The dual-wavelength laser according to claim 9 , wherein the wavelength of the first LD is 783 nm, and correspondingly, the first crystal is Tm:YAG; the wavelength of the second LD is 808 nm, correspondingly, the wavelength of the second LD is 808 nm. 11 . The second crystal is Nd:YAG.

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