CN112803238A - Optical fiber coupling laser system - Google Patents

Optical fiber coupling laser system Download PDF

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Publication number
CN112803238A
CN112803238A CN202110143300.5A CN202110143300A CN112803238A CN 112803238 A CN112803238 A CN 112803238A CN 202110143300 A CN202110143300 A CN 202110143300A CN 112803238 A CN112803238 A CN 112803238A
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CN
China
Prior art keywords
lens
laser
polarization
polarization beam
laser system
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Pending
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CN202110143300.5A
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Chinese (zh)
Inventor
王文娟
卢昆忠
胡慧璇
闫大鹏
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Wuhan Raycus Fiber Laser Technologies Co Ltd
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Wuhan Raycus Fiber Laser Technologies Co Ltd
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Application filed by Wuhan Raycus Fiber Laser Technologies Co Ltd filed Critical Wuhan Raycus Fiber Laser Technologies Co Ltd
Priority to CN202110143300.5A priority Critical patent/CN112803238A/en
Publication of CN112803238A publication Critical patent/CN112803238A/en
Pending legal-status Critical Current

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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
    • H01S5/00—Semiconductor lasers
    • H01S5/40—Arrangement of two or more semiconductor lasers, not provided for in groups H01S5/02 - H01S5/30
    • H01S5/4012—Beam combining, e.g. by the use of fibres, gratings, polarisers, prisms
    • 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
    • H01S5/00—Semiconductor lasers
    • H01S5/005—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping
    • H01S5/0071—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping for beam steering, e.g. using a mirror outside the cavity to change the beam direction
    • 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
    • H01S5/00—Semiconductor lasers
    • H01S5/005—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping
    • H01S5/0085—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping for modulating the output, i.e. the laser beam is modulated outside the laser cavity
    • 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
    • H01S5/00—Semiconductor lasers
    • H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium

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  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Optics & Photonics (AREA)
  • Optical Couplings Of Light Guides (AREA)
  • Semiconductor Lasers (AREA)

Abstract

The invention relates to the technical field of laser equipment, and discloses an optical fiber coupling laser system which comprises a plurality of laser assemblies, wherein the plurality of laser assemblies are divided into two groups, each group of laser assemblies forms a beam of light, the beams of the two groups of laser assemblies are combined by a polarization beam combining element and then output, and the polarization beam combining element comprises a half-wave plate, a reflecting element and a polarizing element which are connected into a whole. The optical fiber coupling laser system provided by the invention adopts the polarization beam combining element with an integrated structure to replace a plurality of independent dispersive optical devices in the traditional laser system, is applied to optical path coupling of a semiconductor laser, can realize polarization beam combination of an optical path, improves the assembly process, simplifies the assembling and adjusting process of beam combination steps, fixes the relative positions of all elements of the polarization beam combining element with the integrated structure, is favorable for improving the stability of the relative positions of all elements, and ensures the installation precision.

Description

Optical fiber coupling laser system
Technical Field
The invention relates to the technical field of laser equipment, in particular to an optical fiber coupling laser system.
Background
In recent years, with the development of semiconductor material epitaxial growth technology, semiconductor laser waveguide structure optimization technology, cavity surface passivation technology, high stability packaging technology and high efficiency heat dissipation technology, the rapid development of high power and high beam quality lasers for optical fiber output is promoted particularly under the requirements of direct semiconductor laser industrial processing application and high power optical fiber lasers.
With the development of fiber lasers, people have higher and higher requirements on the power of fiber-coupled semiconductor lasers. The semiconductor laser with higher power is required to be obtained, and the single-chip power is improved; and secondly, the number of chips in the optical fiber laser is increased. Before chips are not updated, the power of a single chip has an upper limit, so increasing the number of chips is an effective method for improving the power of the optical coupling semiconductor laser.
The structure that beam and polarization were closed in space of adopting more to present semiconductor laser closes and to realize laser coupling and improve power, and present laser coupling structure mostly need set up a plurality of optical devices for the installation and debugging process is comparatively complicated, and the installation accuracy is difficult to be guaranteed.
Disclosure of Invention
The invention provides an optical fiber coupling laser system which is used for solving the problems that most of the existing laser coupling structures need to be provided with a plurality of optical devices, so that the installation and adjustment process is complex, and the installation precision is difficult to guarantee.
The invention provides an optical fiber coupling laser system which comprises a plurality of laser assemblies, wherein the laser assemblies are divided into two groups, each group of laser assemblies forms a beam of light, the beams of the two groups of laser assemblies are combined and output through a polarization beam combining element, and the polarization beam combining element comprises a half-wave plate, a reflecting element and a polarizing element which are connected into a whole.
According to the fiber coupling laser system provided by the invention, the polarization beam combination element comprises a combined lens which is connected into a whole, a reflecting surface and a polarization surface are arranged on the combined lens, and the half-wave plate is connected to the combined lens.
According to the fiber-coupled laser system provided by the invention, the combined lens comprises a first lens and a second lens, one side surface of the first lens is connected with one side surface of the second lens, the polarization surface is arranged between the first lens and the second lens, and the other side surface of the first lens, which is opposite to the side surface provided with the polarization surface, is provided with the reflection surface.
According to the optical fiber coupling laser system provided by the invention, the first lens is of a parallelogram structure, so that the reflecting surface and the polarization surface are arranged in parallel; or the first lens is in a trapezoid structure or a triangular structure, so that the reflecting surface and the polarization surface are arranged in an intersecting manner.
According to the fiber coupled laser system provided by the invention, the half-wave plate is arranged corresponding to the reflecting surface, or the half-wave plate is arranged corresponding to the polarization surface.
According to the fiber coupling laser system provided by the invention, the polarization beam combination elements are connected into a whole through optical cement.
According to the fiber coupling laser system provided by the invention, the beam direction of one group of laser assemblies in the two groups of laser assemblies corresponds to the reflecting surface, and the beam direction of the other group of laser assemblies corresponds to the polaroid.
According to the fiber coupling laser system provided by the invention, the light outlet end of the polarization beam combination element is connected with an output optical system.
According to the optical fiber coupling laser system provided by the invention, each laser assembly comprises a laser chip, a fast axis collimating mirror, a slow axis collimating mirror and a reflecting mirror which are sequentially arranged along the same straight line.
According to the optical fiber coupling laser system provided by the invention, the laser assemblies and the polarization beam combination element are arranged on the bottom plate, the bottom plate is provided with step structures at the corresponding positions of each group of laser assemblies, and the step structures corresponding to each group of laser assemblies comprise step surfaces which are in one-to-one correspondence with the group of laser assemblies and are sequentially arranged.
The optical fiber coupling laser system provided by the invention adopts the polarization beam combining element with an integrated structure to replace a plurality of independent dispersive optical devices in the traditional laser system, is applied to optical path coupling of a semiconductor laser, can realize polarization beam combination of an optical path, improves the assembly process, simplifies the assembling and adjusting process of beam combination steps, fixes the relative positions of all elements of the polarization beam combining element with the integrated structure, is favorable for improving the stability of the relative positions of all elements, and ensures the installation precision.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of an application of a fiber coupled laser system according to the present invention;
FIG. 2 is a schematic structural diagram of a polarization beam combiner provided in the present invention;
FIG. 3 is a second schematic diagram of an application of the fiber coupled laser system provided by the present invention;
FIG. 4 is a third schematic diagram of an application of a fiber coupled laser system provided by the present invention;
fig. 5 is a fourth schematic view of an application of the fiber coupled laser system provided by the present invention.
Reference numerals:
1. a laser chip; 2. a fast axis collimating mirror; 3. a slow axis collimating mirror; 4. a mirror; 5. a polarization beam combining element; 51. a first combined lens; 511. a first lens; 512. a second lens; 513. a half-wave plate; 514. a plane of polarization; 515. a reflective surface; 52. a second combined lens; 521. a first lens; 522. a second lens; 523. a half-wave plate; 524. a plane of polarization; 525. a reflective surface; 53. a third combined lens; 54. a fourth combined lens; 6. an output optical system; 7. a base plate.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The fiber coupled laser system of the present invention is described below in conjunction with fig. 1-5.
Referring to fig. 1, the present embodiment provides an optical fiber coupled laser system, which includes a plurality of laser assemblies, the plurality of laser assemblies are divided into two groups, each group of laser assemblies forms a beam, the beams of the two groups of laser assemblies are combined by a polarization beam combining element 5 and then output, and the polarization beam combining element 5 includes a half-wave plate, a reflective element and a polarization element which are connected as a whole. The laser assembly is used for emitting laser. Each set of laser assemblies includes a plurality of laser assemblies. A plurality of laser assemblies in each set of laser assemblies may be arranged in parallel to form a beam of light. And then the light from the two groups of laser assemblies is converged by utilizing the polarization beam combining element 5, so that more light beams are obtained, and the total power of the laser is improved.
The polarization beam combination element 5 is simultaneously positioned on the light paths of the two groups of laser assemblies, and the light beams of the two groups of laser assemblies are integrated by adjusting the light beam propagation directions of the two groups of laser assemblies. The polarization beam combining element 5 in this embodiment is a half-wave plate, a reflective element and a polarization element which are connected as a whole. I.e., the polarization beam combining element 5 is integrally a component and integrates the half-wave plate, the reflecting element and the polarizing element at the same time. The polarization beam combination element 5 can realize the functions of a half-wave plate, a reflecting element and a polarizing element, thereby realizing the integrated beam combination of two beams of light.
The optical fiber coupling laser system provided by the embodiment adopts the polarization beam combining element 5 with an integrated structure to replace a plurality of independent dispersive optical devices in the traditional laser system, is applied to optical path coupling of a semiconductor laser, can realize polarization beam combination of an optical path, improves the assembly process, simplifies the assembling and adjusting process of beam combination steps, fixes the relative positions of all elements of the polarization beam combining element 5 with the integrated structure, is also favorable for improving the stability of the relative positions of all elements, and ensures the installation precision.
On the basis of the above embodiment, further, the integrated setting structure of the polarization beam combining element 5 provided in this embodiment is specifically: the polarization beam combination element 5 comprises a combined lens which is connected into a whole, a reflecting surface and a polarization surface are arranged on the combined lens, and the half-wave plate is connected with the combined lens. The combined lens may include a plurality of lenses connected as a single body. The reflecting function is realized by arranging a reflecting surface at a proper position of the combined lens to form a reflecting element. The polarizing function is realized by disposing a polarizing plane forming polarizing element at an appropriate position of the combined lens. The half-wave plate is then integrated by the connection at the appropriate location of the combined lens.
On the basis of the above embodiment, further, the combined lens includes a first lens and a second lens, one side surface of the first lens is connected to one side surface of the second lens, a polarization surface is disposed between the first lens and the second lens, and a reflection surface is disposed on the other side surface of the first lens opposite to the side surface on which the polarization surface is disposed. Specifically, one side surface of the first lens and one side surface of the second lens are attached and connected, and a polarization surface is arranged on the attachment surface. The plane of polarization may be a PBS film structure.
On the basis of the above embodiment, further, the first lens has a parallelogram structure such that the reflection surface is disposed in parallel with the polarization surface; or the first lens is in a trapezoid structure or a triangular structure, so that the reflecting surface and the polarizing surface are arranged in an intersecting manner. When the first lens is in a trapezoid structure, the reflecting surface is connected with the extension surface of the polarization surface. The second lens is of a triangular structure. One side surface of the second lens is used for being attached and connected with one side surface of the first lens so as to set a polarization surface.
On the basis of the above embodiment, further, the half-wave plate is disposed corresponding to the reflection surface, or the half-wave plate is disposed corresponding to the polarization surface.
Specifically, referring to fig. 2, the present embodiment provides four different integrated structures of the polarization beam combiner 5. The first integrated structure of the polarization beam combiner 5 includes a first combined lens 51. The first lens 511 of the first combined lens 51 has a parallelogram structure; i.e. with a parallelogram in cross-section. The second lens 512 of the first combined lens 51 has a triangular structure, and may be a right-angled triangular structure. The inclined surface of the second lens 512 is connected to a side surface of the first lens 511, and a polarization surface 514 is disposed therebetween. A reflecting surface 515 is provided on the side of the first lens 511 opposite to the polarizing surface 514. I.e. the reflecting surface 515 is arranged parallel to the polarizing surface 514. The half-wave plate 513 is attached to a side of the first lens 511 adjacent to the reflection surface 515 and is disposed opposite to the reflection surface 515.
The first integrated structure of the polarization beam combiner 5 can replace the three separate and independent arrangements of the reflector 4, the half-wave plate and the polarizer, specifically refer to the three separate and independent arrangements on the right side of the arrow corresponding to the first combined lens 51 in fig. 2. The integrated polarization beam combination element 5 is convenient to install and debug and is beneficial to improving the precision.
Referring to fig. 2, the polarization beam combiner 5 of the second integrated structure in this embodiment includes a second combined lens 52. The first lens 521 of the second combined lens 52 has a trapezoid structure, i.e. the cross section of the trapezoid structure can be an isosceles trapezoid. The second lens 522 has a triangular structure, i.e., a cross section of a triangle, and may be a right triangle. The side surface of the first lens 521 is connected with the inclined surface of the second lens 522, and a polarization surface 524 is arranged between the side surface of the first lens 521 and the inclined surface of the second lens 522. A reflecting surface 525 is provided on the side surface of the first lens 521 opposite to the polarizing surface 524. That is, the polarizing surface 524 and the reflecting surface 525 are provided on both waist side surfaces of the first lens 521 having a trapezoidal shape. The half-wave plate 523 is connected to a side surface of the first lens 521 adjacent to the reflection surface 525 and is disposed opposite to the reflection surface 515. That is, the half-wave plate 523 is connected to the lower bottom surface of the first lens 521 having a trapezoidal shape and is connected to the reflecting surface 525. In another embodiment, the first lens 521 may be a triangular structure. A polarizing surface 524 and a reflecting surface 525 are provided on both side surfaces of the first lens 521 having a triangular shape.
The second integrated structure of the polarization beam combiner 5 can replace three separate and independent arrangements of the mirror 4, the half-wave plate and the polarizer, specifically refer to three separate and independent arrangements on the right side of the arrow corresponding to the second combined lens 52 in fig. 2. The integrated polarization beam combination element 5 is convenient to install and debug and is beneficial to improving the precision.
Referring to fig. 2, the polarization beam combining element 5 of the third integrated structure includes a third combined lens 53. The first lens of the third combined lens 53 has a parallelogram structure; i.e. with a parallelogram in cross-section. The second lens of the first combined lens 51 has a triangular structure, and may be a right-angled triangular structure. The inclined plane of the second lens is connected with one side surface of the first lens, and a polarization plane is arranged between the inclined plane of the second lens and the side surface of the first lens. A reflection surface is provided on a side surface of the first lens opposite to the polarization surface. I.e. the reflecting surface and the polarizing surface are arranged in parallel. The half-wave plate is connected to the side of the second lens opposite to the polarization plane.
The polarization beam combining element 5 of the third integrated structure can replace two separate and independent arrangement forms of the reflector 4, the half-wave plate and the polarizer, specifically refer to two separate and independent arrangement forms on the right side of the arrow corresponding to the third combined lens 53 in fig. 2. The integrated polarization beam combination element 5 is convenient to install and debug and is beneficial to improving the precision.
Referring to fig. 2, the polarization beam combining element 5 of the fourth integrated structure in the present embodiment includes a fourth combined lens 54. The first lens of the fourth combined lens 54 has a trapezoid structure, i.e. the cross section of the trapezoid structure may be an isosceles trapezoid. The second lens is a triangular structure, i.e. the cross section is triangular, and can be specifically a right-angled triangle. The side surface of the first lens is connected with the inclined surface of the second lens, and a polarization surface is arranged between the side surface of the first lens and the inclined surface of the second lens. A reflection surface is provided on a side surface of the first lens opposite to the polarization surface. Namely, the polarization surface and the reflection surface are provided on both waist side surfaces of the first lens having a trapezoidal shape. The half-wave plate is connected to the side of the second lens opposite to the polarization plane. In another embodiment, the first lens may be a triangular structure. The polarizing surface and the reflecting surface are provided on both side surfaces of the first lens in a triangular shape.
The polarization beam combining element 5 of the fourth integrated structure can replace two separate and independent arrangement forms of the reflecting mirror 4, the half-wave plate and the polarizing plate, specifically refer to two separate and independent arrangement forms on the right side of the arrow corresponding to the fourth combined lens 54 in fig. 2. The integrated polarization beam combination element 5 is convenient to install and debug and is beneficial to improving the precision.
The integration of two bundles of light in different position can be realized to the different integrated structure of polarization beam combining component 5, and specific integrated structure can set up according to actual need in a flexible way, does not do the restriction to can realize the beam that closes of two bundles of light and restraint as the purpose.
On the basis of the above embodiment, the polarization beam combining elements 5 are further connected into a whole by optical cement. Namely, the elements of the polarization beam combining element 5 can be connected and fixed to form an integral structure through an optical cement process.
On the basis of the above embodiment, further, the beam direction of one of the two groups of laser assemblies corresponds to the reflection surface, and the beam direction of the other group of laser assemblies corresponds to the polarizer.
In addition to the above embodiments, the output optical system 6 is further connected to the light output end of the polarization beam combining element 5. The light beams of the two groups of laser components are combined by the polarization beam combining element 5 and then output to the output optical system 6.
On the basis of the above embodiment, further, each laser assembly includes a laser chip 1, a fast axis collimating mirror 2, a slow axis collimating mirror 3 and a reflecting mirror 4 which are sequentially arranged along the same straight line. The laser chip 1 is a chip packaged on the heat sink. Each laser chip 1 is correspondingly provided with a fast axis collimating mirror 2FAC, a slow axis collimating mirror 3SAC and a reflector 4; a laser chip 1, a fast axis collimating mirror 2FAC, a slow axis collimating mirror 3SAC and a reflecting mirror 4 which correspond to the laser chip are all fixed on a straight line; the optical axis of the fast axis collimating mirror 2FAC is aligned with the light emitting surface of the corresponding laser chip 1; the optical axis of the slow axis collimating mirror 3SAC is aligned with the light emitting surface of the corresponding laser chip 1 and is superposed with the optical axis of the fast axis collimating mirror 2 FAC; the reflector 4 is vertically arranged with the horizontal plane, and the included angle of the optical axes of the fast axis collimating mirror 2FAC and the slow axis collimating mirror 3SAC which are corresponding to each other is 45 degrees.
On the basis of the above embodiment, further, the laser assemblies and the polarization beam combining element 5 are arranged on the bottom plate 7, the bottom plate 7 is provided with step structures at the corresponding positions of each group of laser assemblies, and the step structures corresponding to each group of laser assemblies comprise step surfaces which are in one-to-one correspondence with the group of laser assemblies and are sequentially arranged. The step surfaces which are arranged in sequence, namely a plurality of step surfaces, are arranged in a rising mode in sequence. One laser assembly in each group of laser assemblies is arranged on one step surface. The laser assemblies in each group of laser assemblies are sequentially distributed in a staggered manner in the height direction, and light beams of the laser assemblies are conveniently coupled.
Based on the above embodiments, further based on the current situation that the semiconductor laser in the current market mostly adopts a spatial beam combining and polarization beam combining structure, and most of the structures are implemented by using a plurality of lens setting modes which are independent and dispersive, the embodiment provides an optical fiber coupling laser system with integrated lenses, which adopts a one-piece combined lens to replace the original 2-3 lenses, and is applied to optical path coupling of the semiconductor laser to implement polarization beam combining of an optical path.
Referring to fig. 1, in this embodiment, a polarization beam combining element 5 is provided as a specific application example of an optical fiber coupling laser system in a first integrated structure, in this case, light emitted by a laser chip 1 is subjected to fast axis compression by a fast axis collimator 2, and is subjected to slow axis compression by a slow axis collimator 3 to be shaped into a beam of parallel light, the beam of parallel light is combined into two beams of light, i.e., light of two groups of laser components, by a reflector 4, the two beams of light are combined into one beam of light by polarization beam combining action of the polarization beam combining element 5, and the finally combined beam of light enters another output optical system 6 to be focused or have other actions. Wherein the bottom plate 7 serves for support and heat dissipation.
Referring to fig. 3, in this embodiment, a polarization beam combining element 5 is provided as a specific application example of an optical fiber coupling laser system in a second integrated structure, in this case, light emitted from a laser chip 1 is subjected to fast axis compression by a fast axis collimator 2, and is subjected to slow axis compression by a slow axis collimator 3 to be shaped into a beam of parallel light, the beam of parallel light is combined into two beams of light by a reflector 4, the two beams of light are combined into one beam of light by polarization beam combining action of the polarization beam combining element 5, and the finally combined beam of light enters other optical systems to be focused or have other actions. Wherein the bottom plate 7 serves for support and heat dissipation. The shape of the combined mirror in the embodiment is different from that in the previous two cases.
Referring to fig. 4, in this embodiment, a polarization beam combining element 5 is provided as a specific application example of an optical fiber coupling laser system in a third integrated structure, in this case, light emitted by a laser chip 1 is subjected to fast axis compression by a fast axis collimator 2, and is subjected to slow axis compression by a slow axis collimator 3 to be shaped into a beam of parallel light, a plurality of beams of parallel light are combined into two beams of light by a reflector 4, the two beams of light are combined into one beam of light by polarization beam combining action of the polarization beam combining element 5, and the finally combined beam of light enters other optical systems to be focused or have other actions. Wherein the bottom plate 7 serves for support and heat dissipation. Compared with the laser system shown in fig. 1, the half-wave plate in the embodiment has different positions, so that the light emitting directions are different.
Referring to fig. 5, in this embodiment, a polarization beam combining element 5 is provided as a specific application example of an optical fiber coupling laser system in a fourth integrated structure, in this case, light emitted by a laser chip 1 is subjected to fast axis compression by a fast axis collimator 2, and is subjected to slow axis compression by a slow axis collimator 3 to be shaped into a beam of parallel light, a plurality of beams of parallel light are combined into two beams of light by a reflector 4, the two beams of light are combined into one beam of light by polarization beam combining action of the polarization beam combining element 5, and the finally combined beam of light enters other optical systems to be focused or have other actions. Wherein the bottom plate 7 serves for support and heat dissipation. Compared with the laser system shown in fig. 3, the half-wave plate in the embodiment has different positions, which causes different light emitting directions.
In the embodiment, a combined lens is adopted to replace the original 2-3 lenses, so that the functions realized by the original 2-3 lenses are realized. The assembling process is improved, the assembling and adjusting process in the step is simplified, and the position relation between the lenses is ensured by utilizing the machining precision.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. The optical fiber coupling laser system is characterized by comprising a plurality of laser assemblies, wherein the laser assemblies are divided into two groups, each group of laser assemblies forms a beam of light, the beams of the two groups of laser assemblies are combined and output through a polarization beam combining element, and the polarization beam combining element comprises a half-wave plate, a reflecting element and a polarizing element which are connected into a whole.
2. The fiber coupled laser system of claim 1, wherein the polarization beam combiner comprises a combination lens integrally connected to each other, the combination lens has a reflection surface and a polarization surface, and the half-wave plate is connected to the combination lens.
3. The fiber-coupled laser system according to claim 2, wherein the combined lens includes a first lens and a second lens, a side surface of the first lens and a side surface of the second lens are connected, the polarization surface is disposed between the first lens and the second lens, and the reflection surface is disposed on the other side surface of the first lens opposite to the side surface on which the polarization surface is disposed.
4. The fiber-coupled laser system of claim 3, wherein the first lens has a parallelogram structure such that the reflection surface is disposed parallel to the polarization surface; or the first lens is in a trapezoid structure or a triangular structure, so that the reflecting surface and the polarization surface are arranged in an intersecting manner.
5. The fiber coupled laser system according to any of claims 2 to 4, wherein the half-wave plate is disposed corresponding to the reflection surface or the half-wave plate is disposed corresponding to the polarization surface.
6. The fiber-coupled laser system according to any one of claims 1 to 4, wherein the polarization beam combining elements are connected into a whole by optical cement.
7. The fiber-coupled laser system according to any one of claims 2 to 4, wherein the beam direction of one of the two sets of laser modules corresponds to the reflection surface, and the beam direction of the other set of laser modules corresponds to the polarizer.
8. The fiber-coupled laser system according to any one of claims 1 to 4, wherein an output optical system is connected to the light output end of the polarization beam combining element.
9. The fiber coupled laser system according to any one of claims 1 to 4, wherein each of the laser assemblies comprises a laser chip, a fast axis collimating mirror, a slow axis collimating mirror and a reflecting mirror arranged in sequence along the same straight line.
10. The fiber-coupled laser system according to any one of claims 1 to 4, wherein the laser assemblies and the polarization beam combining element are disposed on a bottom plate, and the bottom plate is provided with a step structure at a position corresponding to each group of laser assemblies, and the step structure corresponding to each group of laser assemblies includes step surfaces corresponding to the laser assemblies of the group one by one and sequentially disposed.
CN202110143300.5A 2021-02-02 2021-02-02 Optical fiber coupling laser system Pending CN112803238A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113794108A (en) * 2021-08-04 2021-12-14 大族激光科技产业集团股份有限公司 Optical fiber coupling semiconductor laser
CN114421279A (en) * 2022-03-30 2022-04-29 北京凯普林光电科技股份有限公司 Semiconductor laser device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113794108A (en) * 2021-08-04 2021-12-14 大族激光科技产业集团股份有限公司 Optical fiber coupling semiconductor laser
CN114421279A (en) * 2022-03-30 2022-04-29 北京凯普林光电科技股份有限公司 Semiconductor laser device

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