A high-power dual-output external cavity narrow-linewidth laser that is easy to mass produce

Abstract

The present invention relates to the field of laser technology, and discloses a high-power dual-output external cavity narrow linewidth laser that is easy to mass produce, including a heat sink, a positioning groove is provided on the front of the heat sink, a laser chip is fixedly installed on the left end of the front of the heat sink, the front of the heat sink is fixedly connected with a positioning frame located at the top and bottom of the positioning groove, the interior of the positioning frame is fixedly connected with a self-focusing lens located inside the positioning groove, and the front of the heat sink is fixedly connected with a limit plate located on the right side of the positioning frame. The high-power dual-output external cavity narrow linewidth laser that is easy to mass produce greatly optimizes the collimation adjustment of the output light of the laser chip and the feedback light direction adjustment of the laser. In the design of the external cavity optical path, there is no secondary focusing process after collimation. Therefore, in the overall optical path, all optical elements do not need to withstand excessively high energy density, which will not cause heating and deformation, and the optical path supports high optical power output.

Description

Technical Field

[0001] The invention relates to the technical field of lasers, and in particular to a high-power dual-output external cavity narrow-linewidth laser that is easy to mass produce. Background Art

[0002] Except for free electron lasers, the basic working principles of various lasers are the same. The indispensable conditions for generating lasers are particle number inversion and gain greater than loss. Therefore, the indispensable components of the device are the excitation (or pumping) source and the working medium with metastable energy levels. Excitation is the excitation of the working medium to an excited state after absorbing external energy, creating conditions for realizing and maintaining particle number inversion. The excitation methods include optical excitation, electrical excitation, chemical excitation and nuclear energy excitation. The working medium has a metastable energy level to make stimulated radiation dominant, thereby realizing light amplification. Another common component of the laser is the resonant cavity, but the resonant cavity (see optical resonant cavity) is not an indispensable component. The resonant cavity can make the photons in the cavity have a consistent frequency, phase and running direction, so that the laser has good directionality and coherence.

[0003] Lasers are core components of various optical communications and optical sensing systems. External cavity technology is a very important method in lasers. It is often used for tuning laser wavelengths and narrowing line widths. At the same time, lasers with external cavity structures can easily generate high output powers. Therefore, they are widely used in many fields such as cold atomic physics, environmental monitoring, biological monitoring, industrial measurement, and spectroscopy. The current traditional production scheme of external cavity lasers requires fine adjustment in the collimation and feedback links, making the production process very complicated. The optical path of the external cavity laser cannot work under high-power output. Therefore, a high-power dual-output external cavity narrow-linewidth laser that is easy to mass-produce is proposed to solve the above-mentioned problems. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the shortcomings of the prior art, the present invention provides a high-power dual-output external cavity narrow-linewidth laser that is easy to mass-produce, has the advantages of being simpler in the collimation and feedback links and being able to work under high-power output, and solves the problem in the traditional solution that fine adjustment is required in the collimation and feedback links, making the production process very complicated and the external cavity laser optical path unable to work under high-power output.

[0006] (II) Technical solution

[0007] In order to achieve the above-mentioned purpose of being simpler in the collimation and feedback links and being able to work under high-power output, the present invention provides the following technical solutions: a high-power dual-output external cavity narrow-linewidth laser that is easy to mass-produce, including a heat sink, a positioning groove is opened on the front side of the heat sink, a laser chip is fixedly installed on the left end of the front side of the heat sink, the front side of the heat sink is fixedly connected to a positioning frame located at the top and bottom ends of the positioning groove, the interior of the positioning frame is fixedly connected to a self-focusing lens located inside the positioning groove, the front side of the heat sink is fixedly connected to a limit plate located on the right side of the positioning frame, the interior of the limit plate is fixedly connected to a beam splitting cube located on the front side of the heat sink, the right end of the front side of the heat sink is fixedly connected to a fixed plate, reset springs are fixedly installed on opposite sides of the two fixed plates, a fixed pressure plate is fixedly installed on the end of the reset spring away from the fixed plate, a protective pad is fixedly connected to the inner side of the fixed pressure plate, and the interiors of the two protective pads are fixedly connected to a reflection angle cone located inside the positioning groove.

[0008] Preferably, the heat sink is in an "L" shape, and a mounting groove is provided at the left end of the front side of the heat sink.

[0009] Preferably, the positioning groove is arc-shaped, and the laser chip is fixedly installed in a mounting groove opened on the front side of the heat sink.

[0010] Preferably, the two positioning frames are both arc-shaped, and there is a gap between the right inner wall of the positioning frame and the heat sink.

[0011] Preferably, the length L of the self-focusing lens is 0.25+0.5*N times the pitch Z, wherein the pitch Z represents the length of the light beam completing a sinusoidal periodic change along the propagation direction.

[0012] Preferably, there are four limit plates, two of which are located at the top of the positioning slot, and the other two are located at the bottom of the positioning slot, and the limit plates are in an "L" shape.

[0013] Preferably, the two fixing plates are both straight plates, the fixing pressure plate is arc-shaped, and the height of the fixing pressure plate is smaller than the height of the fixing plate.

[0014] Preferably, the protection pad comprises a soft body and a protection cover, and the soft body may be a sponge.

[0015] Preferably, the reflection angle cone includes an incident surface and three reflection surfaces, the three reflection surfaces form a cone, and the angle between the three reflection surfaces is ninety degrees.

[0016] Preferably, the four light-emitting surfaces of the beam splitter cube are coated with a high-transmittance film.

[0017] (III) Beneficial effects

[0018] Compared with the prior art, the present invention provides a high-power dual-output external cavity narrow linewidth laser that is easy to mass produce and has the following beneficial effects:

[0019] 1. This high-power dual-output external cavity narrow linewidth laser, which is easy to mass-produce, is placed on an L-shaped heat sink through a laser chip. The light-emitting surface is directly in contact with a cylindrical self-focusing lens. After being collimated by the self-focusing lens, the emitted parallel light enters a beam splitter cube. The incident surface or transmission surface of the beam splitter cube is plated with a filter structure. A part of the reflected light after entering the beam splitter cube is emitted as output light, and the other part of the transmitted light continues to be incident on the reflection angle cone, completes a 180-degree reflection on the reflection angle cone surface, and enters the beam splitter cube again. The reflected light of the reverse incident beam splitter cube is used as the second output light. After the transmitted light passes through the self-focusing lens, the laser energy is reversely injected into the incident surface of the laser chip, thereby forming an external resonant cavity oscillation, which greatly optimizes the collimation adjustment of the laser chip output light. The influencing component is the self-focusing lens. The function of the self-focusing lens is The divergent light beam emitted by the laser chip is collimated into parallel light. The self-focusing lens can be placed close to the laser chip, so it is easy to control the focus error during installation. In order to improve the collimation effect of the self-focusing lens, a secondary collimating lens can be placed behind it. The distance between them can be controlled through the customized heat sink positioning groove to enhance the collimation effect. It is very convenient to install and use. If the light beam after the self-focusing lens is slightly divergent, a micro-convex lens mold can be used for secondary collimation. If the light beam after the self-focusing lens is slightly converged, a micro-concave mold can be used for secondary collimation. This greatly optimizes the feedback light direction adjustment of the laser. The influencing component is the reflection angle cone. In the external cavity optical path design, there is no secondary focusing process after collimation. Therefore, in the overall optical path, the self-focusing lens does not need to withstand excessively high energy density, will not cause heat and deformation, and the optical path supports high optical power output.

[0020] 2. The high-power dual-output external cavity narrow linewidth laser that is easy to mass-produce has greatly simplified the production process through the design of optical Louis coupling. Due to the optical Louis adjustment, the overall laser size can be greatly reduced, and miniaturized narrow linewidth lasers can be produced. The optical path of the external cavity does not need to withstand high energy density, so it can withstand extremely large optical power output and support two-way laser coherent output. It is suitable for a variety of optical coherence applications. The length of the external cavity can be changed by extending the length of the self-focusing lens, thereby achieving different laser linewidths. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a front view of the structure of a high-power dual-output external cavity narrow-linewidth laser that is easy to mass-produce, as proposed by the present invention;

[0022] Figure 2 A bottom view of a high-power dual-output external cavity narrow-linewidth laser structure that is easy to mass produce, as proposed by the present invention;

[0023] Figure 3 This is a schematic diagram of a reflection cone structure of a high-power dual-output external cavity narrow-linewidth laser that is easy to mass-produce and proposed by the present invention.

[0024] In the figure: 1 heat sink, 2 positioning groove, 3 laser chip, 4 positioning frame, 5 self-focusing lens, 6 limit plate, 7 beam splitting cube, 8 fixed plate, 9 return spring, 10 fixed pressure plate, 11 protection pad, 12 reflection angle cone. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] See also Figure 1-3, a high-power dual-output external cavity narrow linewidth laser that is easy to mass produce, including a heat sink 1, the heat sink 1 is in an "L" shape, a mounting groove is provided at the left end of the front of the heat sink 1, a positioning groove 2 is provided at the front of the heat sink 1, the positioning groove 2 is arc-shaped, a laser chip 3 is fixedly installed at the left end of the front of the heat sink 1, and the laser chip 3 is fixedly installed in the mounting groove provided on the front of the heat sink 1, the front of the heat sink 1 is fixedly connected with a positioning frame 4 located at the top and bottom ends of the positioning groove 2, the two positioning frames 4 are both arc-shaped, and there is a gap between the right inner wall of the positioning frame 4 and the heat sink 1, the interior of the positioning frame 4 is fixedly connected with a self-focusing lens 5 located inside the positioning groove 2, the length L of the self-focusing lens 5 is 0.25+0.5*N times the pitch Z, where the pitch Z represents the length of a light beam to complete a sinusoidal periodic change along the propagation direction, the front of the heat sink 1 is fixedly connected with a limit plate 6 located on the right side of the positioning frame 4, the number of the limit plates 6 is four, two limit plates 6 are distributed at the top of the positioning groove 2, and the other two limit plates 6 are distributed At the bottom end of the positioning groove 2, the limiting plate 6 is in an "L" shape, and a beam splitting cube 7 located on the front of the heat sink 1 is fixedly connected inside the limiting plate 6. The four light-emitting surfaces of the beam splitting cube 7 are plated with a high-transmittance film, and a fixing plate 8 is fixedly connected to the right end of the front of the heat sink 1. The two fixing plates 8 are both straight plates. Reset springs 9 are fixedly installed on the opposite sides of the two fixing plates 8. A fixed pressure plate 10 is fixedly installed on the end of the reset spring 9 away from the fixed plate 8. The fixed pressure plate 10 is arc-shaped, and the height of the fixed pressure plate 10 is less than the height of the fixed plate 8. A protective pad 11 is fixedly connected to the inner side of the fixed pressure plate 10. The protective pad 11 includes a software and a protective cover. The software can be a sponge. The two protective pads 11 are fixedly connected to the inside of the positioning groove 2. The reflection angle cone 12 includes an incident surface and three reflection surfaces. The three reflection surfaces form a cone, and the angle between the three reflection surfaces is ninety degrees, thereby achieving the purpose of being simpler in the collimation and feedback links and being able to work under high power output.

[0027] When in use, the laser chip 3 is placed on the L-shaped heat sink 1, and the light-emitting surface is directly in contact with the cylindrical self-focusing lens 5. After being collimated by the self-focusing lens 5, the emitted parallel light enters the beam splitting cube 7. The incident surface or transmission surface of the beam splitting cube 7 is plated with a filter structure. A part of the reflected light after entering the beam splitting cube 7 is emitted as output light, and the other part of the transmitted light continues to be incident on the reflection angle cone 12, completes 180-degree reflection on the surface of the reflection angle cone 12, and enters the beam splitting cube 7 again. The reflected light of the reverse incident beam splitting cube 7 is used as the second output light. After the transmitted light passes through the self-focusing lens 5, the laser energy is reversely injected into the incident surface of the laser chip 3. Thereby, external resonant cavity oscillation is formed, which greatly optimizes the collimation adjustment of the output light of the laser chip 3. The influencing component is the self-focusing lens 5. The function of the self-focusing lens 5 is to collimate the divergent light beam emitted by the laser chip 3 into parallel light. The self-focusing lens 5 can be placed close to the laser chip 3, so it is easy to control the focus error during installation. In order to improve the collimation effect of the self-focusing lens 5, a secondary collimating lens can be placed behind it, and its distance can be controlled through the customized heat sink 1 positioning groove 2 to enhance its collimation effect. It is very convenient to install and use. If the light beam after the self-focusing lens 5 is slightly divergent, a micro-convex lens mold can be used for secondary collimation. If the self-focusing lens 5 The light beam is then slightly converged, and a micro-concave mold can be used for secondary collimation, which greatly optimizes the feedback light direction adjustment of the laser. The influencing component is the reflection angle cone 12. The angle cone reflector 12 has a variety of structural types, and its function is to reflect the parallel incident light back to the original direction. The characteristic of the angle cone reflector 12 is that it is composed of three mutually perpendicular right-angled surfaces. The incident light forms a total reflection on the three right-angled surfaces and returns along the original path. As shown in the figure, it is a three-sided reflector, and the three surfaces are at an angle of 90 degrees to each other. It should be noted that the present invention does not limit any specific structure. The structure that satisfies the requirement of reflecting the parallel incident light back to the original direction belongs to the angle reflector described in the present invention. The external cavity light In the optical path design, there is no secondary focusing process after collimation. Therefore, in the overall optical path, all optical components do not need to withstand excessively high energy density, which will not cause heating and deformation. The optical path supports large optical power output. The design of optical path coupling greatly simplifies the production process. Due to the optical path adjustment, the overall laser size can be greatly reduced, and miniaturized narrow-linewidth lasers can be produced. The optical path of the external cavity does not need to withstand high energy density, so it can withstand extremely large optical power output and support two-way laser coherent output. It is suitable for a variety of optical coherence applications. The length of the external cavity can be changed by extending the length of the self-focusing lens 5, thereby achieving different laser line widths.

[0028] In summary, the high-power dual-output external cavity narrow linewidth laser that is easy to mass produce is placed on the L-shaped heat sink 1 through the laser chip 3, and the light-emitting surface is directly in contact with the cylindrical self-focusing lens 5. After being collimated by the self-focusing lens 5, the emitted parallel light enters the beam splitting cube 7, and the incident surface or transmission surface of the beam splitting cube 7 is plated with a filter structure. A part of the reflected light after entering the beam splitting cube 7 is emitted as the output light, and the other part of the transmitted light continues to be incident on the reflection angle cone 12, completes a 180-degree reflection on the surface of the reflection angle cone 12, and enters the beam splitting cube 7 again, and the reflection of the reverse incident beam splitting cube 7 is emitted. The light is used as the second output light. After the transmitted light passes through the self-focusing lens 5, the laser energy is reversely injected into the incident surface of the laser chip 3, thereby forming an external resonant cavity oscillation, which greatly optimizes the collimation adjustment of the output light of the laser chip 3. The influencing component is the self-focusing lens 5. The function of the self-focusing lens 5 is to collimate the divergent light beam emitted by the laser chip 3 into parallel light. The self-focusing lens 5 can be placed close to the laser chip 3, so it is easy to control the focus error during installation. In order to improve the collimation effect of the self-focusing lens 5, a secondary collimating lens can be placed behind it, and its positioning groove 2 is controlled by the customized heat sink 1. distance, enhancing its collimation effect, and it is very convenient to install and use. If the light beam after the self-focusing lens 5 diverges slightly, a micro-convex lens mold can be used for secondary collimation. If the light beam after the self-focusing lens 5 converges slightly, a micro-concave mold can be used for secondary collimation, which greatly optimizes the feedback light direction adjustment of the laser. The influencing component is the reflection angle cone 12. In the design of the external cavity optical path, there is no secondary focusing process after collimation. Therefore, in the overall optical path, all optical components do not need to withstand excessive energy density, which will not cause heating and deformation. The optical path supports large optical power output, and the design of optical easy coupling can greatly The production process is greatly simplified. Since the optical path is easy to adjust, the overall laser size can be greatly reduced, and miniaturized narrow-linewidth lasers can be produced. The optical path of the external cavity does not need to withstand high energy density, so it can withstand extremely large optical power output and support two-way laser coherent output. It is suitable for a variety of optical coherence applications. The length of the external cavity can be changed by extending the length of the self-focusing lens 5, thereby achieving different laser line widths. This solves the problem that the traditional solution requires fine adjustment in the collimation and feedback links, making the production process very complicated and the external cavity laser optical path unable to work under high-power output.

[0029] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0030] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-power dual output external cavity narrow linewidth laser that is easy to mass production, characterized in that: The heat sink (1) comprises a heat sink (1), wherein a positioning groove (2) is provided on the front side of the heat sink (1), a laser chip (3) is fixedly mounted on the left end of the front side of the heat sink (1), a positioning frame (4) located at the top and bottom ends of the positioning groove (2) is fixedly connected to the front side of the heat sink (1), a self-focusing lens (5) located inside the positioning groove (2) is fixedly connected inside the positioning frame (4), a limiting plate (6) located on the right side of the positioning frame (4) is fixedly connected to the front side of the heat sink (1), a beam splitting cube (7) located on the front side of the heat sink (1) is fixedly connected inside the limiting plate (6), a fixing plate (8) is fixedly mounted on the right end of the front side of the heat sink (1), and return springs (7) are fixedly mounted on opposite sides of the two fixing plates (8). 9), a fixed pressure plate (10) is fixedly mounted on one end of the return spring (9) away from the fixed plate (8), a protective pad (11) is fixedly connected to the inner side of the fixed pressure plate (10), and a reflective angle cone (12) located inside the positioning groove (2) is fixedly connected to the inside of the two protective pads (11); the length L of the self-focusing lens (5) is 0.25+0.5*N times the pitch Z, wherein the pitch Z represents the length of a light beam that completes a sinusoidal cycle change along the propagation direction; the reflective angle cone (12) includes an incident surface and three reflective surfaces, the three reflective surfaces form a cone, and the angle between the three reflective surfaces is ninety degrees; the heat sink (1) is in an "L" shape, and a mounting groove is provided at the left end of the front side of the heat sink (1); the positioning groove ( 2) is arc-shaped, the laser chip (3) is fixedly installed in a mounting groove opened on the front side of the heat sink (1); the two positioning frames (4) are both arc-shaped, and there is a gap between the right inner wall of the positioning frame (4) and the heat sink (1); the number of the limiting plates (6) is four, two limiting plates (6) are distributed at the top of the positioning groove (2), and the other two limiting plates (6) are distributed at the bottom of the positioning groove (2), and the limiting plates (6) are "L" shaped; the two fixing plates (8) are both straight plates, the fixing pressure plate (10) is arc-shaped, and the height of the fixing pressure plate (10) is less than the height of the fixing plate (8); the laser chip is placed on the L-shaped heat sink, and the light emitting surface is directly in contact with the cylindrical self-focusing lens, and after being collimated by the self-focusing lens, the light emitting surface is directly in contact with the cylindrical self-focusing lens. The parallel light is incident on a beam splitting cube, and the incident surface or transmission surface of the beam splitting cube is plated with a filter structure. A part of the reflected light after incident on the beam splitting cube is emitted as output light, and another part of the transmitted light continues to be incident on the reflection angle cone, completes 180-degree reflection on the reflection angle cone surface, and is incident on the beam splitting cube again. The reflected light of the reverse incident beam splitting cube is used as the second output light. After the transmitted light passes through the self-focusing lens, the laser energy is reversely injected into the incident surface of the laser chip, thereby forming an external resonant cavity oscillation; a secondary collimating lens is placed after the self-focusing lens (5). If the light beam after the self-focusing lens is slightly divergent, a micro-convex lens mold is used for secondary collimation. If the light beam after the self-focusing lens is slightly convergent, a micro-concave mold is used for secondary collimation.

2. According to claim 1, a high-power dual-output external cavity narrow linewidth laser that is easy to mass produce, characterized in that: The protection pad (11) comprises a soft body and a protection cover, and the soft body is a sponge.

3. The high-power dual-output external cavity narrow linewidth laser that is easy to mass produce according to claim 2, characterized in that: The four light-emitting surfaces of the beam splitting cube (7) are coated with a high-transmittance film.

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