Laser device

By optimizing the component position setting of the laser device, the problems of volume increase and beam quality decrease in traditional lasers during high power output are solved, miniaturization of the laser device and laser output with high energy and narrow pulse width are achieved, and the stability of the system is improved.

CN223285424UActive Publication Date: 2025-08-29DONGGUAN UNIV OF TECH
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Patent Information

Application Number
CN202422510058.2
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-10-17
Publication Date
2025-08-29
Estimated Expiration
2034-10-17

AI Technical Summary

Technical Problem

Traditional large-energy stack pump lasers often face problems such as volume increase, beam quality decrease and thermal focal length enhancement when outputting high power, limiting the output power and stability of the laser system.

Method used

The laser device design is adopted, including a laser source, a collimated beam expansion assembly, a first half wave plate, a Faraday optical rotator, a first 45° mirror, a polarization cubic beam splitter and a stack amplification module. By optimizing component position settings, the laser is miniaturized and the high-energy, narrow pulse width output is achieved.

Benefits of technology

The laser device is miniaturized and the output of high energy and narrow pulse width lasers is improved, improving the stability and beam quality of the laser system.

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Abstract

The utility model belongs to the technical field of laser, and discloses a laser device, which comprises a laser source, a collimating and beam expanding assembly, a first half-wave plate, a Faraday rotator and a first 45-degree reflecting mirror which are arranged at intervals along a first straight line, and further comprises a polarization cube beam splitter which is arranged at one side of the first 45-degree reflecting mirror at intervals along a second straight line, the first 45-degree reflecting mirror obliquely faces the Faraday rotator and the polarization cube beam splitter; the stack amplification modules are arranged on one side of the polarization cubic beam splitter at intervals along a third straight line, the first straight line and the third straight line are parallel and do not coincide, and the second straight line is perpendicular to the first straight line and the third straight line; laser emitted by the laser source sequentially passes through the collimation and beam expanding assembly, the first half-wave plate, the Faraday rotator, the first 45-degree reflector, the polarization cube beam splitter and the stack amplification module, the position arrangement of all the components is optimized, the laser device is miniaturized, and high-energy and narrow-pulse-width laser is output.
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Description

Technical Field

[0001] The utility model relates to the field of laser technology, in particular to a laser device. Background Art

[0002] Lasers have broad application prospects in fields such as lidar, laser processing, and laser cosmetology. The development of technology and the promotion of related applications have triggered two user demands for lasers: first, ever-larger systems require higher energy and power; second, the general trend of technological miniaturization requires a more compact overall structure. Traditional high-energy stack-pumped lasers often face problems such as increased volume, resulting in reduced beam quality, enhanced thermal focal length effects, and nonlinear effects when outputting high power. These issues limit the output power and stability of laser systems. Utility Model Content

[0003] The purpose of the utility model is to provide a laser device, optimize the position arrangement of various components, miniaturize the laser device, and output high-energy, narrow-pulse-width laser.

[0004] To achieve this purpose, the present invention adopts the following technical solutions:

[0005] A laser device, comprising a laser source, a collimating beam expander, a first half-wave plate, a Faraday rotator, and a first 45° reflector, arranged along a first straight line, and further comprising:

[0006] a polarization cube beam splitter, arranged at intervals on one side of the first 45° reflector along a second straight line, wherein the first 45° reflector is tilted toward the Faraday rotator and the polarization cube beam splitter;

[0007] A stacked amplification module is arranged at intervals on one side of the polarization cube beam splitter along a third straight line, the first straight line is parallel to and does not overlap with the third straight line, and the second straight line is perpendicular to the first straight line and the third straight line;

[0008] The laser emitted by the laser source passes through the collimating beam expander assembly, the first half-wave plate, the Faraday rotator, the first 45° reflector, the polarization cube beam splitter, and the stack amplification module in sequence.

[0009] As an optional technical solution, the laser device also includes a reflector assembly, which is arranged on a side of the stack magnification module away from the polarization cube beam splitter. The stack magnification module injects the laser into the reflector assembly, and the reflector assembly reflects the laser to the stack magnification module and emits it through the polarization cube beam splitter.

[0010] As an optional technical solution, a quarter-wave plate is provided between the stacked amplification module and the reflector assembly.

[0011] As an optional technical solution, the reflector assembly includes:

[0012] a second 45° reflecting mirror, disposed on a side of the quarter-wave plate facing away from the stacked amplification module;

[0013] A third 45° reflector and a total reflection mirror, wherein the third 45° reflector faces the second 45° reflector and the total reflection mirror, and the incident laser passes through the stacked amplification module, the quarter-wave plate, the second 45° reflector, the third 45° reflector and the total reflection mirror in sequence, and the laser reflected by the total reflection mirror passes through the third 45° reflector, the second 45° reflector, the quarter-wave plate and the stacked amplification module in sequence and is emitted through the polarization cube beam splitter.

[0014] As an optional technical solution, the third 45° reflector and the total reflector are both located on a side of the second 45° reflector close to the first straight line.

[0015] As an optional technical solution, the total reflection mirror is located on a side of the third 45° reflection mirror close to the second straight line.

[0016] As an optional technical solution, the laser source, the collimating beam expander assembly, the first half-wave plate, the Faraday rotator, and the stack amplification module are all located on the same side of the second straight line.

[0017] As an optional technical solution, the laser source is a semiconductor laser.

[0018] As an optional technical solution, a polarizer is provided between the first half-wave plate and the Faraday rotator.

[0019] As an optional technical solution, a second half-wave plate is provided between the first 45° reflector and the polarization cube beam splitter.

[0020] Beneficial effects of the utility model:

[0021] The laser device provided by the utility model includes a laser source, a collimating beam expanding assembly, a first half-wave plate, a Faraday rotator, a first 45-degree reflector, a polarization cube beam splitter, and a stack amplification module. The laser source, the collimating beam expanding assembly, the first half-wave plate, the Faraday rotator, and the first 45-degree reflector are sequentially arranged at intervals along a first straight line. The polarization cube beam splitter is arranged at intervals on one side of the first 45-degree reflector along a second straight line, and the first 45-degree reflector is inclined to face the Faraday rotator and the polarization cube beam splitter. The stack amplification module is arranged at intervals on one side of the polarization cube beam splitter along a third straight line. The first straight line is parallel to and does not overlap with the third straight line, and the second straight line is perpendicular to the first and third straight lines.

[0022] After the laser source emits a laser, the collimating and expanding assembly collimates and expands the laser so that the beam parallelism and beam diameter meet the requirements. After the laser is collimated and expanded, the first half-wave plate first changes the polarization state of the laser, and then the Faraday rotator eliminates back-reflected light to reduce reflection loss. Thereafter, the first 45° reflector reflects the laser to the polarizing cube beam splitter. The first 45° reflector changes the path of the laser, shortens the length of the laser device, and is conducive to miniaturization. The polarizing cube beam splitter guides the laser to a preset path so that it enters the stack amplifier module, which amplifies the power and extracts the energy of the laser and outputs high-energy, narrow-pulse-width laser. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the laser device of the present utility model.

[0024] In the picture:

[0025] 1. Laser source;

[0026] 2. Collimation and beam expansion components;

[0027] 3. First half wave plate;

[0028] 4. Faraday rotator;

[0029] 5. The first 45° reflector;

[0030] 6. Polarization cube beam splitter;

[0031] 7. Stack amplification module;

[0032] 81. Second 45° reflector; 82. Third 45° reflector; 83. Total reflector;

[0033] 9. Quarter wave plate;

[0034] 10. Housing;

[0035] 11. Second half wave plate;

[0036] 12. Polarizer. DETAILED DESCRIPTION

[0037] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0038] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0039] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0040] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0041] like Figure 1As shown, this embodiment provides a laser device, which includes a laser source 1, a collimating beam expander 2, a first half-wave plate 3, a Faraday rotator 4, and a first 45-degree reflector 5, which are arranged at intervals along a first straight line. The laser device also includes a polarization cube beam splitter 6 and a stack amplification module 7. The polarization cube beam splitter 6 is arranged at intervals along a second straight line on one side of the first 45-degree reflector 5, and the first 45-degree reflector 5 is inclined toward the Faraday rotator 4 and the polarization cube beam splitter 6. The stack amplification module 7 is arranged at intervals along a third straight line on one side of the polarization cube beam splitter 6. The first straight line is parallel to and does not overlap with the third straight line, and the second straight line is perpendicular to the first and third straight lines. Laser light emitted from the laser source 1 passes through the collimating beam expander 2, the first half-wave plate 3, the Faraday rotator 4, the first 45-degree reflector 5, the polarization cube beam splitter 6, and the stack amplification module 7 in sequence.

[0042] Specifically, after the laser source 1 emits a laser, the collimating and expanding assembly 2 collimates and expands the laser so that the beam parallelism and beam diameter meet the requirements. After the laser is collimated and expanded, the first half-wave plate 3 first changes and adjusts the polarization state of the laser, and then the Faraday rotator 4 eliminates back-reflected light to reduce reflection loss. Thereafter, the first 45° reflector 5 reflects the laser to the polarization cube beam splitter 6. The first 45° reflector 5 changes the path of the laser, shortens the length of the laser device, and is conducive to miniaturization. The polarization cube beam splitter 6 guides the laser to a preset path so that it enters the stack amplifier module 7. The stack amplifier module 7 amplifies the power and extracts the energy of the laser, and outputs high-energy, narrow-pulse-width laser.

[0043] In this embodiment, the laser light emitted by the laser source 1 is a pulsed laser light.

[0044] Optionally, the laser device also includes a reflector assembly, which is arranged on the side of the stack magnification module 7 away from the polarization cube beam splitter 6. The stack magnification module 7 injects the laser into the reflector assembly, and the reflector assembly reflects the laser to the stack magnification module 7 and emits it through the polarization cube beam splitter 6.

[0045] When the reflector assembly reflects the laser light to the stack amplifier module 7 , the stack amplifier module 7 performs secondary power amplification and energy extraction on the laser light and outputs laser light with higher energy.

[0046] Optionally, a quarter-wave plate 9 is provided between the stack amplifier module 7 and the reflector assembly. The laser light incident on the reflector assembly by the stack amplifier module 7 and the laser light reflected from the reflector assembly to the stack amplifier module 7 are both regulated by the quarter-wave plate 9, which can change and adjust the polarization state of the laser light.

[0047] Optionally, the reflector assembly includes a second 45° reflector 81, a third 45° reflector 82 and a total reflector 83, and the second 45° reflector 81 is arranged on the side of the quarter wave plate 9 away from the stack amplifier module 7; the third 45° reflector 82 faces the second 45° reflector 81 and the total reflector 83, and the incident laser passes through the stack amplifier module 7, the quarter wave plate 9, the second 45° reflector 81, the third 45° reflector 82 and the total reflector 83 in sequence, and the laser reflected by the total reflector 83 passes through the third 45° reflector 82, the second 45° reflector 81, the quarter wave plate 9 and the stack amplifier module 7 in sequence and is emitted through the polarization cube beam splitter 6.

[0048] Optionally, the third 45° reflecting mirror 82 and the total reflecting mirror 83 are both located on a side of the second 45° reflecting mirror 81 close to the first straight line.

[0049] The third 45° reflecting mirror 82 and the total reflecting mirror 83 are both located between the first straight line and the third straight line, which reduces the width of the laser device and is conducive to miniaturization.

[0050] Optionally, the total reflection mirror 83 is located on the side of the third 45° reflection mirror 82 close to the second straight line, which shortens the length of the laser device and is conducive to miniaturization.

[0051] Optionally, the laser source 1, the collimating beam expander assembly 2, the first half-wave plate 3, the Faraday rotator 4 and the stack amplification module 7 are all located on the same side of the second straight line, shortening the length of the laser device and facilitating miniaturization.

[0052] Optionally, the laser source 1 is a semiconductor laser.

[0053] Optionally, the collimating and beam expanding component 2 is a coated concave-convex lens.

[0054] Optionally, a polarizer 12 is provided between the first half-wave plate 3 and the Faraday rotator 4. Laser light passes through the first half-wave plate 3, the polarizer 12, and the Faraday rotator 4 in sequence. The first half-wave plate 3 changes the polarization state of the laser light, and the polarizer 12 and the Faraday rotator 4 work together to improve the effect of eliminating reflected light and reducing reflection loss.

[0055] Optionally, a second half-wave plate 11 is provided between the first 45° reflector 5 and the polarization cube beam splitter 6. The laser light reflected by the first 45° reflector 5 first passes through the second half-wave plate 11 before entering the polarization cube beam splitter 6. The second half-wave plate 11 changes and adjusts the polarization state of the laser light, and the laser light is then incident on the polarization cube beam splitter 6 after the polarization state has been changed and adjusted.

[0056] In this embodiment, the laser device includes a housing 10, and a laser source 1, a collimating beam expander assembly 2, a first half-wave plate 3, a Faraday rotator 4, a first 45° reflector 5, a polarization cube beam splitter 6, a stacked amplification module 7, a reflector assembly, a quarter-wave plate 9, a second half-wave plate 11, and a polarizer 12 are all arranged inside the housing 10.

[0057] In this embodiment, the laser source 1, the collimating beam expander assembly 2, the first half-wave plate 3, the Faraday rotator 4, the first 45° reflector 5, the polarization cube beam splitter 6, the stacked amplification module 7, the reflector assembly, the quarter-wave plate 9, the second half-wave plate 11, and the polarizer 12 are all existing products, and their specific structures and working principles are not further described in this embodiment.

[0058] The first half-wave plate 3 and the second half-wave plate 11 referred to in this embodiment are both existing half-wave plates.

[0059] The first 45° reflector 5 , the second 45° reflector 81 , and the third 45° reflector 82 in this embodiment are all existing 45° reflectors.

[0060] In this embodiment, a plurality of mounting mounts are provided inside the housing 10, and the laser source 1, the collimating beam expander assembly 2, the first half-wave plate 3, the Faraday rotator 4, the first 45° reflector 5, the polarization cube beam splitter 6, the stacked amplification module 7, the reflector assembly, the quarter-wave plate 9, the second half-wave plate 11, and the polarizer 12 are fixedly mounted inside the housing 10 through the mounting mounts.

[0061] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A laser device, characterized in that The laser device comprises a laser source (1), a collimating beam expansion assembly (2), a first half-wave plate (3), a Faraday rotator (4), and a first 45° reflecting mirror (5) arranged along a first straight line at intervals. The laser device also comprises: a polarization cube beam splitter (6) arranged at intervals along a second straight line on one side of the first 45° reflector (5), the first 45° reflector (5) being tilted toward the Faraday rotator (4) and the polarization cube beam splitter (6); A stack amplification module (7) is arranged at intervals on one side of the polarization cube beam splitter (6) along a third straight line, the first straight line is parallel to and does not overlap with the third straight line, and the second straight line is perpendicular to the first straight line and the third straight line; The laser light emitted by the laser source (1) passes through the collimating beam expander (2), the first half-wave plate (3), the Faraday rotator (4), the first 45° reflector (5), the polarization cube beam splitter (6), and the stack amplification module (7) in sequence.

2. The laser device according to claim 1, characterized in that The laser device further comprises a reflector assembly, wherein the reflector assembly is arranged on a side of the stack amplification module (7) away from the polarization cube beam splitter (6); the stack amplification module (7) injects laser light into the reflector assembly, and the reflector assembly reflects the laser light to the stack amplification module (7) and emits the laser light through the polarization cube beam splitter (6).

3. The laser device according to claim 2, characterized in that A quarter wave plate (9) is provided between the stack amplification module (7) and the reflector assembly.

4. The laser device according to claim 3, characterized in that The reflector assembly comprises: a second 45° reflecting mirror (81) disposed on a side of the quarter-wave plate (9) facing away from the stacked amplification module (7); A third 45° reflector (82) and a total reflector (83), wherein the third 45° reflector (82) faces the second 45° reflector (81) and the total reflector (83), and the incident laser passes through the stacked amplification module (7), the quarter-wave plate (9), the second 45° reflector (81), the third 45° reflector (82) and the total reflector (83) in sequence, and the laser reflected by the total reflector (83) passes through the third 45° reflector (82), the second 45° reflector (81), the quarter-wave plate (9) and the stacked amplification module (7) in sequence and is emitted through the polarization cube beam splitter (6).

5. The laser device according to claim 4, characterized in that The third 45° reflecting mirror (82) and the total reflecting mirror (83) are both located on a side of the second 45° reflecting mirror (81) close to the first straight line.

6. The laser device according to claim 5, characterized in that The total reflection mirror (83) is located on a side of the third 45° reflection mirror (82) close to the second straight line.

7. The laser device according to claim 1, wherein The laser source (1), the collimating beam expansion assembly (2), the first half-wave plate (3), the Faraday rotator (4), and the stack amplification module (7) are all located on the same side of the second straight line.

8. The laser device according to claim 1, wherein The laser source (1) is a semiconductor laser.

9. The laser device according to claim 1, wherein A polarizing plate (12) is provided between the first half-wave plate (3) and the Faraday rotator (4).

10. The laser device according to claim 1, wherein A second half-wave plate (11) is provided between the first 45° reflector (5) and the polarization cube beam splitter (6).