CN114447747A

CN114447747A - Dual-wavelength laser

Info

Publication number: CN114447747A
Application number: CN202111656136.4A
Authority: CN
Inventors: 王志敏; 许昌; 张艺轩; 张丰丰; 邹跃; 涂玮; 杜仕峰; 薄勇; 彭钦军
Original assignee: Technical Institute of Physics and Chemistry of CAS
Current assignee: Technical Institute of Physics and Chemistry of CAS
Priority date: 2021-12-30
Filing date: 2021-12-30
Publication date: 2022-05-06

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

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

The laser has high monochromaticity, high directivity, high brightness and good coherence. In medical science, the characteristics of high brightness, high directivity and the like of laser are mainly utilized. The laser controls the size of the focused light spot through the lens, changes the power density, enables the temperature of a certain point of a human body to reach 200-1000 ℃ at most, and enables the pathological tissue to be solidified and decomposed in a very short time (0.1-10ms) so as to be melted and gasified. The laser moves at a certain speed to replace the traditional surgical scalpel to carry out gasification cutting on various soft and hard pathological tissues of a human body, and compared with the traditional operation, the laser gasification cutting device has the characteristics of high precision, sterility, small wound, fusion at any time and the like.

At present, most of laser light sources used for laser internal medicine operations are single-wavelength lasers, and the lasers can only realize the operation cutting function and do not have the hemostasis function, so that operation scabbing is large, healing is slow and the like.

In laser medical surgery applications, it is desirable that a laser source be capable of outputting two wavelengths simultaneously and enabling individual adjustment of the laser power of each wavelength, corresponding to cutting and hemostasis in laser medical surgery, respectively. The flexibility of the operation treatment is greatly improved, and the problems of high blood stopping difficulty, high operation scabbing, long recovery period and the like of the cutting operation are solved. The dual-wavelength laser surgery treatment is more and more widely applied in the field of medical clinical medicine in the future, is different from the traditional laser surgery cutting, and has the characteristics of environmental protection, safety, small dust and low noise. Most of the existing composite wavelength minimally invasive laser medical equipment is realized in a mode of spectrum beam combination and double-light-source coupling, a light source of the equipment comprises two independent lasers, and the lasers enter the same optical fiber through the spectrum beam combination and the optical fiber coupling component to realize double-wavelength output. Because it contains two independent lasers, so the structure is complicated, bulky, stability is low.

Disclosure of Invention

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

a dual-wavelength laser comprises a laser resonant cavity component, a laser gain module, a water cooling system and a power supply controller; the laser gain module is positioned in the laser resonant cavity component and comprises a first gain module and a second gain module, wherein the first gain module is used for generating laser with a first wavelength; 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 manner; the power supply controller is respectively connected with the first gain module and the second gain module, supplies power to 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; the water cooling system covers the side part of the laser gain module and is used for cooling the laser gain module.

Further, the first gain module includes a first LD and a first crystal, where the first LD is located on a side surface of the first crystal, and is used for pumping the first crystal, and the first crystal is excited and radiated to generate first wavelength laser; the second gain module comprises a second LD and a second crystal, the second LD is located at the side part of the second crystal and is used for pumping the second crystal, and the stimulated radiation of the second crystal generates laser with a second wavelength.

Further, the laser resonator component specifically includes, arranged in sequence: a high reflection mirror and an output mirror; the high reflecting mirror is plated with a reflecting film with preset reflectivity for the first wavelength laser and the second wavelength laser and is used for reflecting the first wavelength laser and the second wavelength laser; the output mirror is plated with a transmission film with preset transmissivity for the first wavelength laser and the second wavelength laser and is used for outputting the first wavelength laser and the second wavelength laser; and the first wavelength laser and the second wavelength laser form resonance output between the high reflection mirror and the output mirror respectively.

Further, a high-reflection film with preset reflectivity for the first wavelength laser and the second wavelength laser is plated at the left end of the first crystal to form a reflector; and the end part of the right side of the second crystal is plated with a transmission film with preset transmissivity on the first wavelength laser and the second wavelength laser to form an output mirror, a laser resonant cavity component is formed between the reflector and the output mirror, and the first wavelength laser and the second wavelength laser form resonant output in the resonant cavity component.

Further, the laser resonator component further comprises a laser polarization control element, which is located on the optical path between the high-reflection mirror and the output mirror, and is used for controlling the polarization characteristic of the laser; and/or the laser modulation element is positioned on the light path between the high-reflection mirror and the output mirror and is used for controlling the time domain characteristic of the laser and enabling the laser to work in a pulse mode.

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

Further, the indication light is red light.

Further, the dual wavelength laser further includes an optical fiber coupling member for coupling the first wavelength laser light, the second wavelength laser light, and the indicating light into an optical fiber.

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

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

The first gain module and the second gain module only comprise one LD and one crystal, and the two gain modules share one laser resonant cavity component, so that the first wavelength laser and the second wavelength laser can be generated. In addition, the generation and the closing of the first wavelength laser and the second wavelength laser can be independently controlled through the power supply control part, and further, the power regulation of the first gain module and the second gain module is realized through different currents input into the first gain module and the second gain module by the power supply controller. According to the invention, the first wavelength laser and the second wavelength laser are used for realizing cutting and hemostasis in the operation respectively, so that the hemostasis is faster, and the trauma of the operation is smaller.

Drawings

FIG. 1 is a schematic structural diagram of a dual wavelength laser according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a specific structure of a laser according to an embodiment of the present invention;

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

FIG. 4 is a schematic structural diagram of a first gain module and a second gain module according to an embodiment of the present invention;

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

FIG. 6 is a schematic diagram of a laser according to 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 Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.

A schematic structural diagram of a semiconductor laser according to an embodiment of the present invention is shown in the drawings. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity. The shapes of various regions, layers, and relative sizes and positional relationships therebetween shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, as actually required.

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, can control the generation and the closing of laser with each wavelength through a power supply controller, and realizes the power adjustment of the laser with each wavelength through controlling the current input into the laser gain module. 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), where the laser gain module 3 is disposed inside the laser resonator component 1 and is configured to generate and output dual-wavelength laser, where the dual-wavelength laser is a first-wavelength laser and a second-wavelength laser respectively; the power controller 2 controls the on-off of the power of the laser gain module 3 to realize the independent output control of the first wavelength laser and the second wavelength laser; and respectively controlling the power of the first wavelength laser and the power of the second wavelength laser by adjusting the current input into the laser gain module 3. The higher the current, correspondingly, the higher the power. The water cooling system covers the side face of the laser gain module and is used for cooling 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, which are sequentially disposed, the laser gain module 3 is located inside the laser resonator, and specifically includes a first gain module 3-1 and a second gain module 3-2, where the high-reflection mirror 1-1 is an independent element on which a reflective film with a preset reflectivity is plated, preferably, the reflective film is coated on a side close to the first gain module 3-1, and the output mirror 1-2 is an independent element on which a transmissive film with a preset transmissivity is plated, preferably, the transmissive film is coated on a side close to the second gain module 3-2.

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

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

In the embodiment of the present invention, as shown in fig. 3, the dual-wavelength laser further includes an optical fiber coupling component 4, and the optical fiber coupling component 4 is located at a laser output end of the laser resonator component 1, and is configured to couple the output first wavelength laser and the output second wavelength laser into an optical fiber.

Further, in order to make the output laser visible to the user for the convenience of laser operation, a specific indication light may be coupled, as shown in fig. 3, the dual-wavelength laser further includes an indication light coupling part 5, in the embodiment of the present invention, the indication light is red light, and the indication light coupling part 5 is located between the laser output end of the laser cavity part 1 and the optical fiber coupling part 4. The indication optical coupling component 5 couples the red light into the first wavelength laser and the second wavelength laser, and then the red light is coupled into the optical fiber and led out by the optical fiber coupling component 4.

In a specific embodiment, the first gain block 3-1 and the second gain block 3-2 are structured as shown in fig. 4, the first gain block 3-1 comprises a first LD 3-11 and a first crystal 3-12, the first LD 3-11 is located at a side of the first crystal 3-12, for pumping said first crystal 3-12, said first crystal 3-12 being stimulated to emit laser light of a first wavelength, the second gain block 3-2 comprises a second LD3-21 and a second crystal 3-22, the second LD3-21 is located at a side of the second crystal 3-22, for pumping the second crystal 3-22, the second crystal 3-22 is excited to emit laser light with a second wavelength. The first gain module 3-1 and the second gain module 3-2 can select LDs with different wavelengths and crystals with different structures according to the wavelength of laser light to be output.

A first LD 3-11 in a first gain module 3-1 pumps a first crystal 3-12, the first crystal 3-12 is excited to generate laser with a first wavelength, the laser is reflected by a high reflector, passes through a second gain module 3-2, is output by an output mirror, passes through an indication optical coupling part 5, is coupled with indication light, and is coupled into an optical fiber by an optical fiber coupling part 4. And if the power controller 2 stops supplying power to the first gain module 3-1, the first wavelength laser stops outputting.

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

In a specific embodiment, the first LD 3-11 in the first gain block 3-1 has a wavelength of 783nm, and the corresponding first crystal 3-12 has a Tm: YAG, the wavelength of a second LD3-21 in the second gain module 3-2 is 808nm, and the corresponding second crystal 3-22 is Nd: YAG crystal. The power 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 Tm: YAG crystal, the first wavelength laser that produces is 2 μm wavelength laser, 2 μm wavelength laser is reflected by high mirror 1-1, after passing first gain module 3-1, second gain module 3-2, reach output mirror 1-2, form the resonance to 2 μm wavelength laser between said high mirror 1-1 and said output mirror 1-2, and export the first wavelength laser of 2 μm wavelength through said output mirror 1-2. The high reflection film plated on the high reflection mirror 1-1 is 100% reflective to laser light of 2 μm and 1 μm wavelengths at the same time, and the transmission film plated on the output mirror 1-2 is transmitted at a preset ratio to laser light of 2 μm and 1 μm wavelengths at the same time. Similarly, the power controller 2 supplies power to the second gain block 1-2, and the second LD3-21 in the second gain block 3-2 pumps Nd: the YAG crystal generates laser with a second wavelength of 1 μm, the laser with the 1 μm wavelength is reflected by the high reflection mirror 1-1 after passing through the first gain module 3-1, and reaches the output mirror 1-2 after passing through the first gain module 3-1 and the second gain module 3-2 again, resonance for the laser with the 1 μm wavelength is formed between the high reflection mirror 1-1 and the output mirror 1-2, and the laser with the second wavelength of 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 laser with the wavelength of 1 μm and the laser with the wavelength of 2 μm by controlling the power on/off of the first gain module 3-1 and the second gain module 3-2, respectively. The first gain module 3-1 and the second gain module 3-2 are respectively provided with only one LD and one crystal, and the first wavelength laser and the second wavelength laser form resonance in one laser resonant cavity component 1, so that the whole structure is simple, the size is small, the control is convenient, and the stability is high.

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

Further, as shown in fig. 5, the laser cavity assembly 1 of the two-wavelength laser further includes a laser polarization control element 1-3, a laser modulation element 1-4; wherein, the laser polarization element 1-3 is located on the light path between the high-reflection mirror and the output mirror, which in this embodiment is: the laser polarization control element is located between the first gain module and the second gain module, or located outside the first gain module and the second gain module, where the outside is an end portion of the first gain module far from the second gain module, or an end portion of the second gain module far from the first gain module, and is used for adjusting polarization states of the first wavelength laser and the second wavelength laser and controlling polarization characteristics thereof, and the laser polarization control element may be a polarizer or the like according to actual needs. The laser modulation elements 1-4 are located on a light path between the high-reflection mirror and the output mirror, can be electro-optical switches or acousto-optical switches, and are used for controlling time domain characteristics of the first wavelength laser and the second wavelength laser to form pulsed light so that the laser can work in a pulse mode. In the present invention, the laser polarization control element 1-3 and the laser modulation element 1-4 can be used simultaneously or independently, and when used simultaneously, the positions of the laser polarization control element 1-3 and the laser modulation element 1-4 can be interchanged.

In another embodiment, as shown in fig. 6, the laser gain module 3 comprises a first gain module 3-1 and a second gain module 3-2, the first gain module 3-1 further comprises a first LD 3-11 and a first crystal 3-12, wherein the first LD 3-11 is located at a side portion of the first crystal 3-12, the high reflective film is coated on an end portion (not shown) of the first crystal 3-12 far from the second gain module 3-2, i.e. a left side end portion, to form a high reflective mirror 1-1 of the laser resonator component 1, the reflectivity of the high reflective film to the first wavelength laser and the second wavelength laser is preset as required, and is 100% in the embodiment of the present invention, the second gain module 3-2 further comprises a second LD3-21 and a second crystal 3-22, wherein the transmissive film is coated on an end (not shown) of the second crystal 3-22 on a side away from the first gain module 3-1, that is, a right end, and forms an output mirror 1-2 of the laser resonator assembly 1, the transmissive film has a transmittance for the first wavelength laser light and the second wavelength laser light preset as required, that is, 20% in the embodiment of the present invention, it is understood that the first LD 3-11 in the first gain module 3-1 pumps the first crystal 3-12, the first crystal 3-12 is excited and radiated to generate the first wavelength laser light, the first wavelength laser light is reflected by the high reflective film on the left end of the first crystal 3-12 and then emitted from the right end of the second gain module 3-2, and a harmonic of the first wavelength laser light is formed between the high reflective film on the left end of the first gain module 3-1 and the transmissive film on the right end of the second gain module 3-2 A first wavelength laser output from a right side end portion of the second gain block 3-2; similarly, the second LD3-21 in the second gain module 3-2 pumps the corresponding second crystal 3-22, and the second crystal 3-22 is excited and radiated to generate a second wavelength laser, and the second wavelength laser is reflected by the high reflective film at the left end of the first gain module 3-1 and transmitted through the right end of the second gain module 3-2, and forms a resonance to the second wavelength laser between the high reflective film at the left end of the first gain module 3-1 and the transmissive film at the right end of the second gain module 3-2, and the second wavelength laser is output from the right end of the second gain module 3-2.

As a preferred embodiment, as shown in fig. 7, the laser cavity assembly 1 of the two-wavelength laser further includes a laser polarization control element 1-3, a laser modulation element 1-4; the laser polarization element 1-3 is located on the light path between the high-reflection mirror and the reflecting mirror, and in this embodiment, it is: and the laser polarization control element can be a polarizing plate and the like according to actual needs. The laser modulation elements 1 to 4 are located on the optical paths of the high-reflection mirror and the reflecting mirror, and in this embodiment, are: and the second gain module 3-2 is positioned between the first gain module 3-1 and the second gain module 3-1 and used for controlling the time domain characteristics of the laser with the first wavelength and the laser with the second wavelength to form pulsed light so that the laser can work in a pulsed mode. In the present invention, the laser polarization control element 1-3 and the laser modulation element 1-4 can be used simultaneously or independently, and when used simultaneously, the positions of the laser polarization control element 1-3 and the laser modulation element 1-4 can be interchanged.

As a preferred embodiment, as shown in fig. 7, the dual-wavelength laser further includes a fiber coupling member 4 for coupling the first-wavelength laser light and the second-wavelength laser light into an optical fiber and guiding out.

As a preferred embodiment, as shown in fig. 7, the dual-wavelength laser further includes an indication light coupling part 3, which is located between the output end of the laser cavity part 1 and the optical fiber coupling part 4, and is used for coupling the indication light, the first wavelength laser light and the second wavelength laser light into the optical fiber and guiding out.

It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention.

Claims

1. A dual-wavelength laser is characterized by comprising a laser resonant cavity component, a laser gain module, a water cooling system and a power supply controller;

the laser gain module is positioned in the laser resonant cavity component and comprises a first gain module and a second gain module, wherein the first gain module is used for generating laser with a first wavelength;

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 manner;

the power supply controller is respectively connected with the first gain module and the second gain module, supplies power to 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;

the water cooling system covers the side part of the laser gain module and is used for cooling the laser gain module.

2. The dual wavelength laser of claim 1,

the first gain module comprises a first LD and a first crystal, wherein the first LD is positioned on the side surface of the first crystal and is used for pumping the first crystal, and the first crystal is stimulated to radiate to generate first wavelength laser;

the second gain module comprises a second LD and a second crystal, the second LD is located at the side part of the second crystal and is used for pumping the second crystal, and the stimulated radiation of the second crystal generates laser with a second wavelength.

3. The dual wavelength laser of claim 2,

the laser resonant cavity component specifically comprises the following components in sequence: a high reflection mirror and an output mirror;

the high reflecting mirror is plated with a reflecting film with preset reflectivity for the first wavelength laser and the second wavelength laser and is used for reflecting the first wavelength laser and the second wavelength laser;

the output mirror is plated with a transmission film with preset transmissivity for the first wavelength laser and the second wavelength laser and is used for outputting the first wavelength laser and the second wavelength laser;

and the first wavelength laser and the second wavelength laser form resonance output between the high reflection mirror and the output mirror respectively.

4. The dual wavelength laser as claimed in claim 2, wherein the left side end of the first crystal is coated with a high reflective film having a predetermined reflectivity for the first wavelength laser light and the second wavelength laser light to form a mirror; the right end of the second crystal is plated with a transmission film with preset transmissivity to the first wavelength laser and the second wavelength laser to form an output mirror,

and forming a laser resonant cavity component between the reflecting mirror and the output mirror, wherein the first wavelength laser and the second wavelength laser form resonant output inside the resonant cavity component.

5. The dual wavelength laser as claimed in claim 3 or 4, wherein the laser cavity assembly further comprises a laser polarization control element disposed in the optical path between the high reflection mirror or the output mirror for controlling the polarization characteristic of the laser light; and/or

And the laser modulation element is positioned on the light path between the high-reflection mirror and the output mirror and is used for controlling the time domain characteristic of the laser and enabling the laser to work in a pulse mode.

6. The dual wavelength laser of claim 1 further comprising an indicator light coupling component for coupling indicator light with the first wavelength laser light and the second wavelength laser light.

7. The dual wavelength laser of claim 6 wherein the indicator light is red light.

8. The dual wavelength laser of claim 7 further comprising fiber coupling means for coupling the first wavelength laser light, the second wavelength laser light and the indicator light into an optical fiber.

9. The dual wavelength laser according to any one of claims 1 or 2,

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

10. The dual wavelength laser of claim 9 wherein the first LD wavelength is 783nm and accordingly the first crystal is Tm: YAG; the second LD wavelength is 808nm, and correspondingly, the second crystal is Nd: YAG.