Laser output head and laser
By integrating pump fiber collimation module, gain fiber collimation module, beam combining module and isolation module, the problems of cumbersome fusion splicing and large size in existing lasers are solved, realizing the high-efficiency laser output and detection function of high peak pulse laser.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENZHEN BAOCHENXIN LASER TECH CO LTD
- Filing Date
- 2025-05-09
- Publication Date
- 2026-06-05
AI Technical Summary
The connection of components in existing lasers via fusion welding is cumbersome, prone to nonlinear effects, limits the average and peak power of the laser, and results in a large size.
The pump fiber collimation module, gain fiber collimation module, bundle combiner module, isolation module and lens module are integrated into the output head to reduce the use of passive fiber. The return light monitoring and processing module and alarm module are integrated to realize a high peak pulse laser.
It reduces the use of passive optical fiber, increases the threshold of optical fiber nonlinear effects, reduces laser size and splicing process, improves average power and peak power, and has a backlight detection function that alarms when the laser approaches the damage threshold.
Smart Images
Figure CN224329065U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of laser technology, and in particular to a laser output head and a laser. Background Technology
[0002] MOPA lasers are an ideal solution for lithium battery cutting. With the development of intelligent and electric vehicles, lithium batteries are upgrading towards higher energy density and higher conversion efficiency. Against this backdrop, the market demands for lithium battery processing equipment are constantly increasing. Low-power MOPA lasers can no longer meet the increasingly complex application scenarios. In the future, MOPA lasers will develop towards higher average power, higher energy, and higher peak power.
[0003] Existing technical solutions generally involve fusing an isolator after a reverse combiner, fusing a mode stripper after the isolator, and fusing an output head after the mode stripper. The output head contains a collimator, lens group, aperture, and protective lens. All the devices that are fused together are connected via passive optical fibers. The gain fiber and pump fiber are combined by the reverse combiner to generate a processing laser. The processing laser is transmitted within the passive optical fiber, passing sequentially through the isolator and mode stripper to the output head. After being collimated by the collimator within the output head, it is emitted. The emitted processing laser passes through the lens group, aperture, and protective lens before performing laser processing. The disadvantages of the above-mentioned existing technical solutions are: 1) The devices are connected by fusion splicing, which is not only cumbersome, but also, if there are defects in the splicing, it will degrade the laser parameters at best, and affect the life of the laser at worst; 2) The devices are connected by passive optical fibers, which are long and prone to nonlinear effects, limiting the average power and peak power of the laser; 3) In the above technical solutions, the laser is transmitted in passive optical fibers before the output head, which means that the isolator must be connected to the combiner by fusion splicing, resulting in a large laser size. Utility Model Content
[0004] Therefore, it is necessary to provide a laser output head and a laser to solve the problems of existing technical solutions where components are connected by fusion splicing. This not only involves a cumbersome fiber optic splicing process, but also, if there are defects in the splicing, it can degrade the laser parameters or even affect the laser's lifespan. Furthermore, the components are connected by passive optical fibers, which are relatively long and prone to nonlinear effects, limiting the average and peak power of the laser. In the above technical solutions, the laser propagates in passive optical fibers before the output head, requiring the isolator to be connected to the combiner via fusion splicing, resulting in a large laser size.
[0005] In a first aspect, this utility model provides a laser output head, comprising a pump fiber collimation module and a gain fiber collimation module, a beam combiner module, an isolation module, and a lens module arranged coaxially in sequence, wherein...
[0006] The pump fiber collimation module is used to transmit pump light and collimate the pump light;
[0007] The gain fiber collimation module is used to generate signal light;
[0008] The beam combining module is used to receive the pump light output from the pump fiber collimation module and reflect the pump light to the gain fiber collimation module to excite the signal light to generate a processing laser. The processing laser is collimated by the gain fiber collimation module and then emitted, and then sequentially transmitted through the beam combining module, the isolation module and the lens module.
[0009] The isolation module is used to separate the return light;
[0010] The lens module is used to collimate and expand the processing laser beam.
[0011] In one embodiment, a return light monitoring and processing module is further included, which is used to receive the return light separated by the isolation module and monitor the intensity of the return light.
[0012] In one embodiment, the reflected light monitoring and processing module includes a reflection module, a photodetector, and an alarm module. The reflection module is used to reflect the reflected light separated by the isolation module to the photodetector. The photodetector is used to receive the reflected light and monitor its intensity. When the intensity of the reflected light exceeds a threshold, the alarm module is triggered to sound an alarm.
[0013] In one embodiment, the reflection module includes a convex reflector and a plane reflector. The isolation module separates two beams of reflected light. The convex reflector and the plane reflector each receive one beam of reflected light. The plane reflector also reflects the reflected light back to the convex reflector. The convex reflector then diverges and reflects the reflected light back to the photodetector.
[0014] In one embodiment, the gain fiber collimation module includes a gain fiber and a first collimator disposed at the output end of the gain fiber.
[0015] In one embodiment, the pump fiber collimation module includes a pump fiber and a second collimator disposed at the output end of the pump fiber.
[0016] In one embodiment, the isolation module includes a magneto-optical crystal and a magnet. The magneto-optical crystal is arranged along the axial direction, and the magnet is disposed around the magneto-optical crystal. The magneto-optical crystal can transmit the processing laser and can also receive the reflected light and emit the reflected light in a path different from that of the processing laser.
[0017] In one embodiment, the beam combining module includes a dichroic mirror that can reflect the pump light while transmitting the processing laser.
[0018] In one embodiment, the lens module further includes an aperture stop and a protective lens, the aperture stop being disposed behind the lens module and the protective lens being disposed behind the aperture stop.
[0019] Secondly, this utility model also provides a laser, including the laser output head of any of the above embodiments.
[0020] Implementing the embodiments of this utility model will have the following beneficial effects:
[0021] The laser output head and laser of this invention include a pump fiber collimation module and a gain fiber collimation module, a beam combiner module, an isolation module, and a lens module arranged coaxially in sequence. The pump fiber collimation module transmits and collimates the pump light; the gain fiber collimation module generates signal light; the beam combiner module receives the pump light output from the pump fiber collimation module and reflects it back to the gain fiber collimation module to excite the signal light and generate a processing laser. The processing laser is collimated by the gain fiber collimation module and then emitted, sequentially passing through the beam combiner module, the isolation module, and the lens module. The isolation module separates the returned light; and the lens module collimates and expands the processing laser beam.
[0022] This application, on the one hand, integrates the gain fiber collimation module, pump fiber collimation module, beam combiner module, and isolation module into the output head, which can reduce the use of some passive fibers in the laser (e.g., passive fibers between the cladding stripper and the beam combiner, and between the beam combiner and the indicator light source), improve the fiber nonlinear effect threshold, reduce size, reduce splicing processes, reduce laser loss, and increase the laser's average power and peak power upper limit. On the other hand, it also integrates a backlight monitoring and processing module and an alarm module, which has a backlight detection function and can alarm when the backlight intensity approaches the device damage threshold. Furthermore, the output head of this application can withstand high-power backlight. The integrated laser output head of this application can be used in high-peak pulsed lasers. Attached Figure Description
[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0024] in:
[0025] Figure 1 This is an isometric schematic diagram of the laser output head in one embodiment.
[0026] Figure label:
[0027] 1. Shell;
[0028] 2. Gain fiber collimation module; 21. Gain fiber; 22. First collimator;
[0029] 3. Pump fiber collimation module; 31. Pump fiber; 32. Second collimator;
[0030] 4. Bundle assembly module;
[0031] 5. Isolation module; 51. Magneto-optical crystal; 52. Magnet;
[0032] 6. Lens module;
[0033] 7. Backlight monitoring and processing module; 71. Reflection module; 711. Convex reflector; 712. Plane reflector; 72. Photodetector;
[0034] 8. Aperture; 9. Protective lens. Detailed Implementation
[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0036] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0037] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0038] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.
[0039] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.
[0040] Please combine them together Figure 1 The present invention will now describe the laser output head provided, which is used in a laser.
[0041] The laser output head includes: a pump fiber collimation module 3 and a gain fiber collimation module 2, a beam combiner module 4, an isolation module 5, and a lens module 6 arranged coaxially in sequence. The pump fiber collimation module 3 is used to transmit and collimate the pump light. The gain fiber collimation module 2 is used to generate the signal light. The beam combiner module 4 is used to receive the pump light output from the pump fiber collimation module and reflect the pump light back to the gain fiber collimation module 2 to excite the signal light to generate the processing laser. The processing laser is collimated by the gain fiber collimation module 2 and then emitted. It is then transmitted sequentially through the beam combiner module 4, the isolation module 5, and the lens module 6. The isolation module 5 is used to separate the returned light, and the lens module 6 is used to collimate and expand the processing laser.
[0042] The laser output head also includes a housing 1, and the aforementioned gain fiber collimation module 2, pump fiber collimation module 3, bundle combining module 4, isolation module 5 and lens module 6 are all disposed inside the housing 1.
[0043] Understandably, the gain fiber collimation module 2, the beam combining module 4, the isolation module 5, and the lens module 6 of the laser output head are coaxially arranged in sequence. The gain fiber collimation module 2 is used to generate signal light, the pump fiber collimation module 3 is used to generate collimated pump light, and the beam combining module 4 is used to receive pump light and reflect it into the gain fiber collimation module 2 to excite signal light to generate processing laser. The processing laser is collimated by the gain fiber collimation module 2 and then emitted, and then sequentially transmitted through the beam combining module 4, the isolation module 5, and the lens module 6. The isolation module 5 is used to separate the return light, and the lens module 6 is used to collimate and expand the processing laser. By integrating the gain fiber collimation module 2, the pump fiber collimation module 3, the beam combining module 4, and the isolation module 5 into one unit, the use of passive fiber is reduced, the size is reduced, the fusion splicing process is reduced, the laser loss is reduced, and the upper limit of the average power and peak power of the laser is increased.
[0044] It should be noted that the gain fiber collimation module 2 includes rare-earth ion-doped fiber, which is capable of laser amplification. The pump fiber collimation module 3 is connected to an external pump source to emit pump light. The lens module 6 can collimate and expand the processing laser. A water channel can be installed inside the housing 1, which connects to an external water-cooling module to improve the heat dissipation capacity of the housing 1.
[0045] It is worth noting that the beam combining module 4 includes a dichroic mirror, which can reflect the pump light and transmit the processing laser.
[0046] In this embodiment, the laser output head also includes a return light monitoring and processing module 7. This module receives the return light separated by the isolation module 5 and monitors its intensity. By setting up the return light monitoring and processing module 7, the return light can be absorbed, solving the problem of abnormal heating caused by the return light, preventing the laser from reducing the output power of the pump source due to excessive temperature, improving the stability of the processing laser, and also avoiding the problem of laser focus drift caused by excessive temperature.
[0047] In one embodiment of a laser output head, the reflected light monitoring and processing module 7 includes a reflection module 71, a photodetector 72, and an alarm module. The reflection module 71 reflects the reflected light separated by the isolation module 5 to the photodetector 72. The photodetector 72 receives the reflected light and monitors its intensity. When the intensity of the reflected light exceeds a threshold, the alarm module is triggered. Specifically, the reflection module 71 is positioned between the beam combining module 4 and the isolation module 5. The photodetector 72 and the alarm module are located on the reflection path of the reflection module 71 and are close to the inner wall of the housing 1. By setting the reflection module 71, the reflected light can be reflected to the photodetector 72, which monitors the intensity of the reflected light in real time. When the intensity of the reflected light detected by the photodetector 72 approaches the device damage threshold, the alarm module sounds an alarm.
[0048] In this embodiment, the reflection module 71 includes a convex reflector 711 and a plane reflector 712. The isolation module 5 separates two beams of reflected light. The convex reflector 711 and the plane reflector 712 each receive one beam of reflected light. The plane reflector 712 also reflects the reflected light back to the convex reflector 711, and the convex reflector 711 diverges and reflects the reflected light to the photodetector 72. Specifically, the convex reflector 711 and the plane reflector 712 are arranged opposite each other and spaced apart. The purpose of setting the convex reflector 711 is mainly to expand the reflected light beam and reduce the energy density of the reflected light. That is, to diverge and reflect the reflected light, increase the emission area of the reflected light, and avoid overheating caused by concentrated light. By setting the plane reflector 712, the plane reflector 712 receives one beam of reflected light and then reflects it back to the convex reflector 711. On the one hand, this reduces the number of photodetectors 72. On the other hand, it extends the light transmission path and increases the light loss during transmission, further avoiding overheating.
[0049] In one embodiment of a laser output head, the gain fiber collimation module 2 includes a gain fiber 21 and a first collimator 22 disposed at one end of the gain fiber 21. The gain fiber 21 is connected to the preceding amplification stage system, enabling the gain fiber 21 to emit amplified laser light. After passing through the first collimator 22, the divergent laser light output from the gain fiber 21 is converted into collimated light.
[0050] In one embodiment of a laser output head, the pump fiber collimation module 3 includes a pump fiber 31 and a second collimator 32 disposed at one end of the pump fiber 31. The pump fiber 31 is connected to a pump source, enabling the pump fiber 31 to output pump light. After passing through the second collimator 32, the divergent pump light output by the pump fiber 31 is converted into collimated light.
[0051] In one embodiment of a laser output head, the isolation module 5 includes a magneto-optical crystal 51 and a magnet 52. The magneto-optical crystal 51 is arranged along the axial direction, and the magnet 52 is disposed around the periphery of the magneto-optical crystal 51. The magneto-optical crystal 51 can transmit the processing laser and can also receive the reflected light, and emit the reflected light through a path different from that of the processing laser. Specifically, the processing laser output from the collimation module of the gain fiber 21 can pass through the magneto-optical crystal 51 and then be emitted through the lens module 6. The magneto-optical crystal 51 can also receive the reflected light and emit the reflected light through a path different from that of the processing laser to the reflected light monitoring and processing module 7.
[0052] In one embodiment of a laser output head, the laser output head further includes an aperture 8 and a protective lens 9. The aperture 8 is disposed behind the lens module 6, and the protective lens 9 is disposed behind the aperture 8. By setting the aperture 8, stray light and cladding light can be blocked from output, making the output processing laser energy concentrated and the beam quality better. By setting the protective lens 9, dust can be prevented, avoiding dust from the external environment from entering the housing 1.
[0053] This invention also provides a laser, including the laser output head of any of the above embodiments.
[0054] It is understood that the laser of this invention uses the aforementioned laser output head, in which the gain fiber 21 collimating module, the beam combining module 4, the isolation module 5, and the lens module 6 of the laser output head are arranged coaxially in sequence. The gain fiber 21 collimating module is used to generate signal light, the pump fiber 31 collimating module is used to generate collimated pump light, the beam combining module 4 is used to receive the pump light and reflect the pump light into the gain fiber 21 collimating module to excite the signal light to generate the processing laser. The processing laser is collimated by the gain fiber 21 collimating module and then emitted, and then sequentially transmitted through the beam combining module 4, the isolation module 5, and the lens module 6. The isolation module 5 is used to separate the returned light, and the lens module 6 is used to collimate the signal light. This application addresses laser beam straightening and expansion. Firstly, by integrating the gain fiber collimation module, pump fiber collimation module, beam combiner module, and isolation module into the output head, it reduces the use of some passive fibers in the laser (e.g., passive fibers between the cladding stripper and beam combiner, and between the beam combiner and the indicator light source), thereby increasing the fiber nonlinearity threshold, reducing size, minimizing splicing steps, reducing laser loss, and improving the laser's average and peak power limits. Secondly, it integrates a backlight monitoring and processing module and an alarm module, providing backlight detection functionality. This allows for an alarm when the backlight intensity approaches the device damage threshold. Furthermore, the output head of this application can withstand high-power backlight. This integrated laser output head can be used in high-peak-weighted pulsed lasers.
[0055] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0056] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall still fall within the scope of the present utility model.
Claims
1. A laser output head, characterized in that, It includes a pump fiber collimation module and a gain fiber collimation module, a bundle combiner module, an isolation module, and a lens module arranged coaxially in sequence. The pump fiber collimation module is used to transmit pump light and collimate the pump light; The gain fiber collimation module is used to generate signal light; The beam combining module is used to receive the pump light output from the pump fiber collimation module and reflect the pump light to the gain fiber collimation module to excite the signal light to generate a processing laser. The processing laser is collimated by the gain fiber collimation module and then emitted, and then sequentially transmitted through the beam combining module, the isolation module and the lens module. The isolation module is used to separate the return light; The lens module is used to collimate and expand the processing laser beam.
2. The laser output head according to claim 1, characterized in that, It also includes a return light monitoring and processing module, which is used to receive the return light separated by the isolation module and monitor the intensity of the return light.
3. The laser output head according to claim 2, characterized in that, The reflected light monitoring and processing module includes a reflection module, a photodetector, and an alarm module. The reflection module is used to reflect the reflected light separated by the isolation module to the photodetector. The photodetector is used to receive the reflected light and monitor its intensity. When the intensity of the reflected light exceeds a threshold, the alarm module is triggered to sound an alarm.
4. The laser output head according to claim 3, characterized in that, The reflection module includes a convex reflector and a plane reflector. The isolation module separates two beams of reflected light. The convex reflector and the plane reflector each receive one beam of reflected light. The plane reflector also reflects the reflected light back to the convex reflector. The convex reflector then diverges and reflects the reflected light back to the photodetector.
5. The laser output head according to any one of claims 1 to 4, characterized in that, The gain fiber collimation module includes a gain fiber and a first collimator disposed at the output end of the gain fiber.
6. The laser output head according to any one of claims 1 to 4, characterized in that, The pump fiber collimation module includes a pump fiber and a second collimator disposed at the output end of the pump fiber.
7. The laser output head according to any one of claims 1 to 4, characterized in that, The isolation module includes a magneto-optical crystal and a magnet. The magneto-optical crystal is arranged along the axial direction, and the magnet is arranged around the magneto-optical crystal. The magneto-optical crystal can transmit the processing laser and can also receive the reflected light and emit the reflected light in a path different from that of the processing laser.
8. The laser output head according to any one of claims 1 to 4, characterized in that, The beam combining module includes a dichroic mirror, which can reflect the pump light while transmitting the processing laser.
9. The laser output head according to any one of claims 1 to 4, characterized in that, It also includes an aperture stop and a protective lens, wherein the aperture stop is located behind the lens module and the protective lens is located behind the aperture stop.
10. A laser, characterized in that, Includes the laser output head as described in any one of claims 1 to 9.