A split-type laser and its laser output structure
By using a split laser design with independent pump sources and laser ratio adjustment, the problem of poor stone-breaking effect of holmium lasers and thulium lasers in the field of stone fragmentation has been solved. This enables flexible selection and power adjustment of the laser, thereby improving the stone-breaking effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI FEIBO LASER TECH CO LTD
- Filing Date
- 2025-05-16
- Publication Date
- 2026-05-26
AI Technical Summary
Existing holmium lasers and thulium lasers have problems with poor stone fragmentation performance in the field of stone fragmentation. Holmium lasers are prone to stone fragmentation storms, while thulium lasers generate pulses with relatively low instantaneous pressure.
Design a split laser comprising first and second laser generation structures, each with an independent pump source, and adjust the laser ratio through a laser output structure. Combine forward and reverse beam combiners to increase laser power, and use different doped fibers to generate lasers with wavelengths of 1.9 μm and 2 μm.
It enables flexible selection and power adjustment of lasers, improves the stone-breaking effect, avoids the problem of excessive power in one direction, and enhances the flexibility and efficiency of laser output.
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Figure CN224288865U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of lasers, and further to a split-type laser and a laser output structure. Background Technology
[0002] Since its inception, laser technology has played a vital role in scientific and research fields such as industry, communications, medicine, aerospace, optical storage, and the military, thanks to its advantages of high brightness, good directionality, good monochromaticity, and high collimation, thus promoting rapid development in these fields. Correspondingly, the widespread application of laser technology in various fields also presents new challenges.
[0003] With the continuous development of science and technology, the application of laser technology in the medical field has rapidly expanded, especially the 2µm fiber laser, which has become a research hotspot. Water molecules are a major component of biological tissues, and their absorption coefficients for different wavelengths of laser light are important factors affecting the biothermal effects of lasers. Because water molecules absorb up to 600 cm⁻¹ of 2µm laser light... -1 Compared to the visible light band, it is six orders of magnitude better, enabling shallower tissue penetration and better hemostasis.
[0004] Using thulium-doped or holmium-doped optical fibers as the laser gain medium can achieve laser output in the 1.9–2.2 μm wavelength range. Depending on the gain medium used, lasers can be classified as holmium lasers and thulium lasers. Holmium lasers use holmium-doped optical fibers as the gain medium, while thulium lasers use thulium-doped optical fibers. Currently, holmium lasers are the mainstream for laser lithotripsy, but they can cause a lithotripsy storm during the process, making it difficult to quickly move the endoscope to aim at the stone, thus affecting the lithotripsy effect. Thulium lasers are also used for lithotripsy, but the instantaneous pressure of the pulse they generate is relatively low, resulting in poorer lithotripsy performance.
[0005] In summary, the two types of lasers mentioned above have been widely used in the field of stone crushing, but both have certain problems in application. How to improve lasers to enhance stone crushing effect is a technical problem that urgently needs to be solved in this field. Utility Model Content
[0006] To address the aforementioned technical problems, the purpose of this utility model is to provide a split-type laser and laser output structure, wherein the first laser generating structure and the second laser generating structure each have their own pump source. In other words, the first laser generating structure and the second laser generating structure use different pump sources, which makes it easier for users to select the light source emitted by the laser.
[0007] To achieve the above objectives, the present invention aims to provide a split-type laser, comprising:
[0008] A first laser generating structure, the first laser generating structure including at least one first pump source for generating a first laser;
[0009] The second laser generating structure includes at least one second pump source for generating a second laser.
[0010] A laser output structure having a first output channel and a second output channel, the laser output structure being located on the propagation paths of the first laser and the second laser, the laser output structure being capable of adjusting the ratio of the first laser and the second laser output by the first output channel and the second output channel.
[0011] In some embodiments, the first laser generating structure further includes a first doped fiber, and the at least one first pump source is used to pump the first doped fiber to generate the first laser; the second laser generating structure further includes a second doped fiber, and the at least one second pump source is used to pump the second doped fiber to generate the second laser.
[0012] In some embodiments, the first laser generating structure further includes a first high-reflectivity grating and a first low-reflectivity grating, wherein the first low-reflectivity grating and the first high-reflectivity grating are disposed opposite to each other and form a first laser resonant cavity, and at least a portion of the first doped optical fiber is located within the first laser resonant cavity.
[0013] In some embodiments, the first laser generating structure further includes a first forward beam combiner and / or a first reverse beam combiner, wherein the first forward beam combiner is located on the side where the first high-reflectivity grating is provided, and the first reverse beam combiner is located on the side where the first low-reflectivity grating is provided. The first forward beam combiner and the first reverse beam combiner are respectively used to combine the light emitted by at least two of the first pump sources into the first doped fiber.
[0014] In some embodiments, the second laser generating structure further includes a second high-reflectivity grating and a second low-reflectivity grating, the second low-reflectivity grating and the second high-reflectivity grating being disposed opposite to each other to form a second laser resonant cavity, and at least a portion of the second doped fiber being located within the second laser resonant cavity.
[0015] In some embodiments, the second laser generating structure further includes a second forward beam combiner and / or a second reverse beam combiner. The second forward beam combiner is located on the side where the second high-reflectivity grating is provided, and the second reverse beam combiner is located on the side where the second low-reflectivity grating is provided. The second forward beam combiner and the second reverse beam combiner are respectively used to combine the light emitted by at least two of the second pump sources into the second doped fiber.
[0016] In some embodiments, the first forward combiner is used to combine the light emitted from the two first pump sources into the first doped fiber, and the first reverse combiner is used to combine the light emitted from the four first pump sources into the first doped fiber.
[0017] The second forward combiner is used to combine the light emitted from the two second pump sources into the second doped fiber, and the second reverse combiner is used to combine the light emitted from the four second pump sources into the second doped fiber.
[0018] In some embodiments, the first laser generating structure further includes a first cladding optical filter disposed on the first doped optical fiber, the first cladding optical filter being used to filter out residual pump light from the cladding of the first doped optical fiber;
[0019] The second laser generating structure further includes a second cladding optical filter disposed on the second doped optical fiber, the second cladding optical filter being used to filter out residual pump light from the cladding of the second doped optical fiber.
[0020] In some embodiments, the first doped fiber is doped with thulium as a gain medium to generate the first laser with a wavelength of 1.9 μm.
[0021] The second doped fiber is doped with holmium as a gain medium to generate the second laser with a wavelength of 2µm.
[0022] In some embodiments, the laser output structure includes a first half-wave plate, a second half-wave plate, a first reflector, and a polarizing beam splitter. The first laser passes through the first half-wave plate and is reflected by the first reflector to the polarizing beam splitter. When the first laser passes through the polarizing beam splitter, part of it is reflected and emitted through the first output channel, and the other part passes through the polarizing beam splitter and is emitted through the second output channel.
[0023] After the second laser passes through the second half-wave plate, part of it passes through the polarizing beam splitter and is emitted through the first output channel, while the other part is reflected and emitted through the second output channel.
[0024] In some embodiments, the laser output structure further includes a second reflector disposed on the light propagation path within the second output channel, for changing the propagation direction of the light within the second output channel so that the light propagation directions within the second output channel and the first output channel are aligned.
[0025] In some embodiments, the laser output structure further includes a first collimating lens, a second collimating lens, a first focusing lens, and a second focusing lens. The first laser beam passes through the first collimating lens and then propagates to the first half-wave plate, and the second laser beam passes through the second collimating lens and then propagates to the second half-wave plate.
[0026] The light rays that propagate into the first output channel pass through the first focusing lens and are emitted outwards;
[0027] The light rays that have traveled into the second output channel pass through the second focusing lens and are emitted outward.
[0028] According to another aspect of this application, this application further provides a laser output structure for a laser, comprising:
[0029] The first half-wave plate, the second half-wave plate, the first reflecting mirror, and the polarizing beam splitter;
[0030] After the first laser passes through the first half-wave plate, it is reflected by the first mirror to the polarizing beam splitter. When the first laser passes through the polarizing beam splitter, part of it is reflected and emitted through the first output channel, and the other part passes through the polarizing beam splitter and is emitted through the second output channel.
[0031] After the second laser passes through the second half-wave plate, part of it passes through the polarizing beam splitter and is emitted through the first output channel, while the other part is reflected and emitted through the second output channel.
[0032] In some embodiments, the laser output structure further includes a second reflector, which is disposed on the light propagation path in the second output channel to change the propagation direction of the light in the second output channel so that the light propagation direction in the second output channel is consistent with that in the first output channel;
[0033] The laser output structure further includes a first collimating lens, a second collimating lens, a first focusing lens, and a second focusing lens. The first laser beam passes through the first collimating lens and then propagates to the first half-wave plate. The second laser beam passes through the second collimating lens and then propagates to the second half-wave plate.
[0034] The light rays that propagate into the first output channel pass through the first focusing lens and are emitted outwards;
[0035] The light rays that have traveled into the second output channel pass through the second focusing lens and are emitted outward.
[0036] Beneficial effects:
[0037] 1. Both the first laser generating structure and the second laser generating structure have their own pump sources. That is to say, the first laser generating structure and the second laser generating structure use different pump sources, which makes it easier for users to select the light source of the laser.
[0038] 2. The laser output structure can adjust the output ratio of the first laser and the second laser to achieve dual-wavelength combined laser or single-wavelength laser output with different power ratios, thus realizing two functions in one machine.
[0039] 3. By combining the light emitted from multiple pump sources into the doped fiber using forward and reverse beam combiners, the output laser power can be increased. On the other hand, by setting forward and reverse beam combiners on both sides of the thulium-doped gain medium section of the doped fiber, the power of the pump light can be increased in two directions, avoiding excessive power due to increasing power in only one direction. Attached Figure Description
[0040] The preferred embodiments will be described below in a clear and easy-to-understand manner, in conjunction with the accompanying drawings, to further explain the above-mentioned characteristics, technical features, advantages and implementation methods of this utility model.
[0041] Figure 1 This is a block diagram of the integrated laser provided in this application;
[0042] Figure 2 This is a schematic diagram of the first laser generating structure of the integrated laser provided in this application;
[0043] Figure 3 This is a schematic diagram of the second laser generating structure of the integrated laser provided in this application;
[0044] Figure 4 This is a schematic diagram of the laser output structure of the integrated laser provided in this application;
[0045] Figure 5 This is a block diagram of the split laser provided in this application;
[0046] Figure 6 This is a schematic diagram of the first laser generating structure of the split laser provided in this application;
[0047] Figure 7 This is a schematic diagram of the second laser generating structure of the split laser provided in this application.
[0048] Attached icon number
[0049] The system comprises: a first laser generating structure 10, a first laser 11, an excitation light 12, a first doped fiber 13, a first arm 131, a second arm 132, a first high-reflection grating 14, a first low-reflection grating 15, a pump source 16, an optical fiber coupler 17, a first laser resonant cavity 18, a first forward beam combiner 191, a first reverse beam combiner 192, and a first cladding optical filter 193.
[0050] The system comprises: a second laser generating structure 20, a second laser 21, a second doped fiber 22, a second high-reflectivity grating 23, a second low-reflectivity grating 24, a second laser resonant cavity 25, and a second cladding optical filter 26.
[0051] Laser output structure 30, first output channel 31, second output channel 32, first half-wave plate 33, second half-wave plate 34, first reflector 35, polarizing beam splitter 36, second reflector 37, first collimating lens 381, second collimating lens 382, first focusing lens 383, second focusing lens 384;
[0052] The system comprises: a first laser generating structure 10A, a first pump source 11A, a first doped fiber 12A, a first laser 13A, a first high-reflection grating 14A, a first low-reflection grating 15A, a first laser resonator 16A, a first forward beam combiner 17A, a first reverse beam combiner 18A, and a first cladding optical filter 19A.
[0053] The system comprises a second laser generating structure 20A, a second pump source 21A, a second doped fiber 22A, a second laser 23A, a second high-reflection grating 24A, a second low-reflection grating 25A, a second laser resonator 26A, a second forward beam combiner 27A, a second reverse beam combiner 28A, and a second cladding optical filter 29A. Detailed Implementation
[0054] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the specific implementation methods of this utility model will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.
[0055] To keep the drawings concise, each figure only schematically shows the parts relevant to the utility model, and these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some figures, only one of the components with the same structure or function is schematically depicted, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one."
[0056] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.
[0057] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0058] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0059] Reference manual attached Figures 1 to 4 This application provides an integrated laser, comprising a first laser generating structure 10, a second laser generating structure 20, and a laser output structure 30. The first laser generating structure 10 outputs a first laser 11 and an excitation light 12. The second laser generating structure 20 is located on the propagation path of the excitation light 12, and the excitation light 12, upon entering the second laser generating structure 20, can excite the second laser generating structure 20 to output a second laser 21. The laser output structure 30 has a first output channel 31 and a second output channel 32, and is located on the propagation path of the first laser 11 and the second laser 21. The laser output structure 30 can adjust the ratio of the first laser 11 and the second laser 21 output by the first output channel 31 and the second output channel 32.
[0060] In the integrated laser provided in this application, the first laser generating structure 10 can generate a first excitation light 12 while generating a first laser 11. The excitation light 12 can excite the second laser generating structure 20 to generate a second laser 22. That is, the first laser generating structure 10 and the second laser generating structure 20 use the same pump source, which makes the structure of the integrated laser provided in this application simpler.
[0061] Furthermore, in the integrated laser provided in this application, the laser output structure 30 can adjust the output ratio of the first laser 11 and the second laser 22 to achieve the adjustment of the output of dual-wavelength combined laser or single-wavelength laser output with different power ratios, thus realizing dual-purpose functionality.
[0062] refer to Figure 2 Specifically, the first laser generating structure 10 includes a first doped fiber 13, a first high-reflectivity grating 14, a first low-reflectivity grating 15, a pump source 16, and an optical fiber coupler 17. The first high-reflectivity grating 14 and the first low-reflectivity grating 15 are disposed opposite to each other to form a first laser resonant cavity 18, and at least a portion of the first doped fiber 13 is located within the first laser resonant cavity 18; the pump source 16 is connected to the first doped fiber 13 and is used to pump the first doped fiber 13; the optical fiber coupler 17 is coupled to the first doped fiber 13 and is used to split the laser beam in the first doped fiber 13 into the first laser beam 11 and the excitation beam 12.
[0063] The first doped fiber 13 is split into a first arm 131 and a second arm 132 via the fiber coupler 17. The first arm 131 has low transmittance, and the first laser 11 is output from the first arm 131. The second arm 132 has high transmittance, and the excitation light 12 is output from the second arm 132. It should be noted that the transmittance of the first arm 131 and the second arm 132 is a comparison between the two, and no specific transmittance value is limited.
[0064] For example, the output fiber of the pump source 16 is 105 / 125 with an NA of 0.22, capable of outputting 793nm laser light. For example, the first high-reflectivity grating is a 1.94µm high-reflectivity grating with a center wavelength of 1.9438µm, a bandwidth of 1.36nm, and a reflectivity of 99.76%. For example, the first low-reflectivity grating is a 1.94µm low-reflectivity grating with a center wavelength of 1.9425µm, a bandwidth of 0.25nm, and a reflectivity of 11.47%. For example, the input fiber of the fiber coupler 17 is 10 / 130 with a coupling ratio of 75:25.
[0065] Preferably, the portion of the first doped fiber 13 located within the first laser resonant cavity 18 is a thulium-doped polarization-maintaining fiber with a diameter of 10 / 130 and an NA of 0.76 / 0.46, used to generate spontaneous emission light in the 1.9µm band and ensure good linear polarization. In other words, the portion of the first doped fiber 13 doped with a thulium gain medium is located within the first laser resonant cavity 18.
[0066] refer to Figure 2The first laser generating structure 10 further includes a first forward combiner 191 and a first reverse combiner 192. The first forward combiner 191 and the first reverse combiner 192 are respectively located on both sides of the first doped fiber 13, specifically on both sides of the thulium-doped polarization-maintaining fiber of the first doped fiber 13, or on both sides of the thulium-doped gain medium portion of the first doped fiber 13. The first forward combiner 191 and the first reverse combiner 192 are respectively used to combine the light emitted by at least two pump sources 16 into the first doped fiber 13.
[0067] It should be noted that the first forward combiner 191 and the first reverse combiner 192 can combine the light emitted from the multiple pump sources 16 into the first doped fiber 13, thereby increasing the power of the output laser. On the other hand, by respectively setting the first forward combiner 191 and the first reverse combiner 192 on both sides of the thulium-doped gain medium portion of the first doped fiber 13, the power of the pump light can be increased in two directions, avoiding excessive power due to increasing power in only one direction.
[0068] For example, the first forward combiner 191 is used to combine the light emitted from two pump sources 16 into the first doped fiber 13, and the first reverse combiner 192 is used to combine the light emitted from four pump sources 16 into the first doped fiber 13. It is understood that in some modified embodiments, the ratio of the number of pump sources 16 corresponding to the first forward combiner 191 and the first reverse combiner 192 can also be 1:1, 1:2, or 1:3, etc., and the number of pump sources 16 corresponding to each should not constitute a limitation of this application.
[0069] For example, the pump input fiber 105 / 125 of the first forward combiner 191 has an NA of 0.22, and the output fiber 10 / 130 has an NA of 0.075 / 0.46. The pump input fiber 105 / 125 of the first reverse combiner 192 has an NA of 0.22, and the output fiber 10 / 130 has an NA of 0.075 / 0.46.
[0070] Preferably, the pump source 16 is an LD pump source.
[0071] refer to Figure 2 The first laser generating structure 10 further includes a first cladding optical filter 193 disposed between the first reverse combiner 192 and the fiber coupler 17. The first cladding optical filter 193 is used to filter out residual pump light from the cladding of the first doped fiber 13. For example, the input fiber 10 / 130 of the cladding optical filter 193 has a signal gain of 20 dB.
[0072] refer to Figure 3 The second laser generating structure 20 includes a second doped fiber 22, a second high-reflectivity grating 23, and a second low-reflectivity grating 24. One end of the second doped fiber 22 is connected to the second arm 132 of the first doped fiber 13. The excitation light 12 can enter the second doped fiber 22 from one end and excite the second doped fiber 22 to generate the second laser 21. The second low-reflectivity grating 24 and the second high-reflectivity grating 23 are disposed opposite to each other to form a second laser resonant cavity 25. At least a portion of the second doped fiber 22 is located within the second laser resonant cavity 25.
[0073] Preferably, the second doped fiber 22 is positioned as a holmium-doped polarization-maintaining fiber with a diameter of 10 / 130 mm and an NA of 0.13 / 0.46, used to generate spontaneous emission light in the 2 μm band. Specifically, the holmium-doped polarization-maintaining fiber portion of the second doped fiber 22 is located within the second laser resonant cavity 25, that is, the portion of the second doped fiber 22 doped with the holmium gain medium is located within the second laser resonant cavity 25.
[0074] refer to Figure 3 The second laser generating structure 20 further includes a second cladding light filter 26 disposed on the second doped optical fiber 22, the second cladding light filter 26 being used to filter out residual pump light from the cladding of the second doped optical fiber 22.
[0075] For example, the first high-reflectivity grating is a 1.94µm high-reflectivity grating with a center wavelength of 1.9438µm, a bandwidth of 1.36nm, and a reflectivity of 99.76%. For example, the first low-reflectivity grating is a 1.94µm low-reflectivity grating with a center wavelength of 1.9425µm, a bandwidth of 0.25nm, and a reflectivity of 11.47%. For example, the input fiber 10 / 130 of the second cladding optical filter 26 has a signal gain of 20dB.
[0076] refer to Figure 4 The laser output structure 30 includes a first half-wave plate 33, a second half-wave plate 34, a first reflector 35, and a polarizing beam splitter 36. The first laser 11 passes through the first half-wave plate 33 and is reflected by the first reflector 35 to the polarizing beam splitter 36. When the first laser 11 passes through the polarizing beam splitter 36, a portion is reflected and emitted through the first output channel 31, while the other portion passes through the polarizing beam splitter 36 and is emitted through the second output channel 32. The second laser 21 passes through the second half-wave plate 34, a portion passes through the polarizing beam splitter 36 and is emitted through the first output channel 31, while the other portion is reflected and emitted through the second output channel 32.
[0077] In this application, through the cooperation of the first half-wave plate 33, the second half-wave plate 34, and the polarizing beam splitter 36, the ratio of the first laser 11 and the second laser 21 passing through and transmitting through the polarizing beam splitter 36 can be adjusted. This changes the ratio of the first laser 11 to the second laser 21 in the first output channel 31 and the second output channel 32, thereby achieving the function of adjusting the output of dual-wavelength combined lasers or single-wavelength lasers with different power ratios. Specifically, by adjusting the first half-wave plate 33, the ratio of the first laser 11 passing through and transmitting through the polarizing beam splitter 36 is changed; by adjusting the second half-wave plate 34, the ratio of the second laser 21 passing through and transmitting through the polarizing beam splitter 36 is changed.
[0078] refer to Figure 4 The laser output structure 30 further includes a second reflector 37, which is disposed on the light propagation path within the second output channel 32. The second reflector 37 is used to change the propagation direction of the light within the second output channel 32, so that the light propagation directions within the second output channel 32 and the first output channel 31 are aligned. It should be noted that when the light propagation directions within the first output channel 31 and the second output channel 32 are aligned, the laser becomes easier for the operator to use. It is understood that in some modified embodiments, the light propagation directions within the first output channel 31 and the second output channel 32 may also have a certain angle, which should not constitute a limitation of this application.
[0079] refer to Figure 4 The laser output structure 30 further includes a first collimating lens 381, a second collimating lens 382, a first focusing lens 383, and a second focusing lens 384. The first laser 11 passes through the first collimating lens 381 and propagates to the first half-wave plate 33; the second laser 21 passes through the second collimating lens 382 and propagates to the second half-wave plate 34. Light rays propagating into the first output channel 31 pass through the first focusing lens 383 and are emitted outwards; light rays propagating into the second output channel 32 pass through the second focusing lens 384 and are emitted outwards. The first collimating lens 381 and the second collimating lens 382 are used to collimate the lasers output from the corresponding optical fibers, ensuring parallel light output. The first focusing lens 383 and the second focusing lens 384 are used to focus the corresponding lasers into the output optical fiber, with the corresponding output optical fiber serving as the corresponding laser output port.
[0080] For example, the first collimating lens 381 and the second collimating lens 382 have a focal length of 10 mm, a diameter of 12.5 mm, and a thickness of 4 mm. The first half-wave plate 33 and the second half-wave plate 34 are both zero-order half-wave plates with a diameter of 12.5 mm. The first reflecting mirror 35 and the second reflecting mirror 37 have a diameter of 12.5 mm, are coated with a 1.9~2.1 μm anti-reflection film, and have a reflectivity of 99.9%. The polarizing beam splitter 36 is preferably a cube with a length of 15 mm and an extinction ratio of 10. -6 .
[0081] refer to Figures 5 to 7 According to another aspect of this application, a split-type laser is further provided, comprising a first laser generating structure 10A, a second laser generating structure 20A, and a laser output structure 30. The first laser generating structure 10A includes at least one first pump source 11A for generating a first laser 13A; the second laser generating structure 20A includes at least one second pump source 21A for generating a second laser 23A; the laser output structure 30 has a first output channel 31 and a second output channel 32, the laser output structure 30 being located on the propagation paths of the first laser 13A and the second laser 23A, and the laser output structure 30 being capable of adjusting the ratio of the first laser 13A and the second laser 23A output by the first output channel 31 and the second output channel 32.
[0082] The first laser generating structure 10A further includes a first doped fiber 12A, and the at least one first pump source 11A is used to pump the first doped fiber 12A to generate the first laser 13A. The second laser generating structure 20A further includes a second doped fiber 22A, and the at least one second pump source 21A is used to pump the second doped fiber 22A to generate the second laser 23A.
[0083] The difference between the split laser provided in this embodiment and the integrated laser provided in the above embodiment is that the first laser generating structure 10A and the second laser generating structure 20A in this embodiment each have their own pump source. That is, the first laser generating structure 10A and the second laser generating structure 20A use different pump sources, which makes it easier for users to select the light source of the laser. For example, when only the first laser 13A is needed, the second laser generating structure 20A can be turned off. When only the second laser 23A is needed, the first laser generating structure 10A can be turned off. When the first laser 13A and the second laser 23A need to be output together, both the first laser generating structure 10A and the second laser generating structure 20A can be turned on. The ratio of the first laser 13A and the second laser 23A output by the first output channel 31 and the second output channel 32 can be adjusted by the laser output structure 30.
[0084] refer to Figure 6 The first laser generating structure 10A further includes a first high-reflectivity grating 14A and a first low-reflectivity grating 15A. The first low-reflectivity grating 15A and the first high-reflectivity grating 14A are arranged opposite to each other to form a first laser resonant cavity 16A. At least a portion of the first doped fiber 12A is located within the first laser resonant cavity 16A. The portion of the first doped fiber 12A located within the first laser resonant cavity 16A is a thulium-doped polarization-maintaining fiber with a diameter of 10 / 130 and an NA of 0.76 / 0.46, used to generate spontaneous emission light in the 1.9µm band and ensure good linear polarization. In other words, the portion of the first doped fiber 12A doped with thulium gain medium is located within the first laser resonant cavity 16A.
[0085] refer to Figure 6 The first laser generating structure 10A further includes a first forward beam combiner 17A and / or a first reverse beam combiner 18A. The first forward beam combiner 17A is located on the side where the first high-reflectivity grating 14A is located, and the first reverse beam combiner 18A is located on the side where the first low-reflectivity grating 15A is located. The first forward beam combiner 17A and the first reverse beam combiner 18A are respectively used to combine the light emitted by at least two of the first pump sources 11A into the first doped fiber 12A.
[0086] It should be noted that the first forward combiner 17A and the first reverse combiner 18A can combine the light emitted from multiple first pump sources 11A into the first doped fiber 12A, thereby increasing the output laser power. Furthermore, by placing the first forward combiner 17A and the first reverse combiner 18A on both sides of the thulium-doped gain medium portion of the first doped fiber 12A, the power of the pump light can be increased in two directions, avoiding excessive power due to power increases in only one direction.
[0087] For example, the first forward combiner 17A is used to combine the light emitted from two first pump sources 11A into the first doped fiber 12A, and the first reverse combiner 17A is used to combine the light emitted from four first pump sources 11A into the first doped fiber 12A. It is understood that in some modified embodiments, the ratio of the number of first pump sources 11A corresponding to the first forward combiner 17A and the first reverse combiner 18A can also be 1:1, 1:2, or 1:3, etc., and the number of first pump sources 11A corresponding to each should not constitute a limitation of this application.
[0088] For example, the pump input fiber 105 / 125 of the first forward combiner 17A has an NA of 0.22, and the output fiber 10 / 130 has an NA of 0.075 / 0.46. The pump input fiber 105 / 125 of the first reverse combiner 18A has an NA of 0.22, and the output fiber 10 / 130 has an NA of 0.075 / 0.46.
[0089] refer to Figure 7 The second laser generating structure 20A further includes a second high-reflectivity grating 24A and a second low-reflectivity grating 25A. The second low-reflectivity grating 25A and the second high-reflectivity grating 24A are arranged opposite to each other to form a second laser resonant cavity 26A. At least a portion of the second doped fiber 22A is located within the second laser resonant cavity 26A. Preferably, the preset position of the second doped fiber 22A is a holmium-doped polarization-maintaining fiber with a diameter of 10 / 130 and an NA of 0.13 / 0.46, used to generate spontaneous emission light in the 2µm band. Specifically, the holmium-doped polarization-maintaining fiber portion of the second doped fiber 22A is located within the second laser resonant cavity 26A, that is, the portion of the second doped fiber 22A doped with the holmium gain medium is located within the second laser resonant cavity 26A.
[0090] refer to Figure 7The second laser generating structure 20A further includes a second forward beam combiner 27A and / or a second reverse beam combiner 28A. The second forward beam combiner 27A is located on the side where the second high-reflectivity grating 24A is provided, and the second reverse beam combiner 28A is located on the side where the second low-reflectivity grating 25A is provided. The second forward beam combiner 27A and the second reverse beam combiner 28A are respectively used to combine the light emitted by at least two second pump sources 21A into the second doped fiber 22A.
[0091] It should be noted that the second forward combiner 27A and the second reverse combiner 28A can combine the light emitted from multiple second pump sources 21A into the second doped fiber 22A, thereby increasing the output laser power. On the other hand, by respectively arranging the second forward combiner 27A and the second reverse combiner 28A on both sides of the thulium-doped gain medium portion of the second doped fiber 22A, the power of the pump light can be increased in two directions, avoiding excessive power due to increasing power in only one direction.
[0092] For example, the second forward combiner 27A is used to combine the light emitted from two second pump sources 21A into the second doped fiber 22A, and the second reverse combiner 27A is used to combine the light emitted from four first pump sources 21A into the second doped fiber 22A. It is understood that in some modified embodiments, the ratio of the number of second pump sources 21A corresponding to the second forward combiner 27A and the second reverse combiner 28A can also be 1:1, 1:2, or 1:3, etc., and the number of second pump sources 21A corresponding to each should not constitute a limitation of this application.
[0093] For example, the pump input fiber of the second forward combiner 27A is 105 / 125 with an NA of 0.22, and the output fiber is 10 / 130 with an NA of 0.075 / 0.46. The pump input fiber of the second reverse combiner 28A is 105 / 125 with an NA of 0.22, and the output fiber is 10 / 130 with an NA of 0.075 / 0.46.
[0094] refer to Figure 6 The first laser generating structure 10A further includes a first cladding optical filter 19A disposed on the first doped optical fiber 12A, the first cladding optical filter 19A being used to filter out residual pump light from the cladding of the first doped optical fiber 12A. (Reference) Figure 7 The second laser generating structure 20A further includes a second cladding light filter 29A disposed on the second doped optical fiber 22A. The second cladding light filter 29A is used to filter out the pump light residual in the cladding of the second doped optical fiber 22A.
[0095] The structure of the laser output module 30 is the same as that of the laser output module 30 described in the above embodiment, and will not be repeated here.
Claims
1. A split-type laser, characterized in that, include: A first laser generating structure, the first laser generating structure including at least one first pump source for generating a first laser; The second laser generating structure includes at least one second pump source for generating a second laser. A laser output structure having a first output channel and a second output channel, the laser output structure being located on the propagation paths of the first laser and the second laser, the laser output structure being capable of adjusting the ratio of the first laser and the second laser output by the first output channel and the second output channel.
2. The split-type laser according to claim 1, characterized in that, The first laser generating structure further includes a first doped fiber, and the at least one first pump source is used to pump the first doped fiber to generate the first laser; the second laser generating structure further includes a second doped fiber, and the at least one second pump source is used to pump the second doped fiber to generate the second laser.
3. The split-type laser according to claim 2, characterized in that, The first laser generating structure further includes a first high-reflectivity grating and a first low-reflectivity grating. The first low-reflectivity grating and the first high-reflectivity grating are disposed opposite to each other and form a first laser resonant cavity. At least a portion of the first doped optical fiber is located in the first laser resonant cavity.
4. The split-type laser according to claim 3, characterized in that, The first laser generating structure further includes a first forward beam combiner and / or a first reverse beam combiner. The first forward beam combiner is located on the side where the first high-reflectivity grating is provided, and the first reverse beam combiner is located on the side where the first low-reflectivity grating is provided. The first forward beam combiner and the first reverse beam combiner are respectively used to combine the light emitted by at least two of the first pump sources into the first doped fiber.
5. The split-type laser according to claim 4, characterized in that, The second laser generating structure further includes a second high-reflectivity grating and a second low-reflectivity grating. The second low-reflectivity grating and the second high-reflectivity grating are arranged opposite to each other to form a second laser resonant cavity. At least a portion of the second doped fiber is located in the second laser resonant cavity.
6. The split-type laser according to claim 5, characterized in that, The second laser generating structure further includes a second forward beam combiner and / or a second reverse beam combiner. The second forward beam combiner is located on the side where the second high-reflectivity grating is provided, and the second reverse beam combiner is located on the side where the second low-reflectivity grating is provided. The second forward beam combiner and the second reverse beam combiner are respectively used to combine the light emitted by at least two second pump sources into the second doped fiber.
7. The split-type laser according to claim 6, characterized in that, The first laser generating structure further includes a first cladding optical filter disposed on the first doped optical fiber, the first cladding optical filter being used to filter out residual pump light from the cladding of the first doped optical fiber; The second laser generating structure further includes a second cladding optical filter disposed on the second doped optical fiber, the second cladding optical filter being used to filter out residual pump light from the cladding of the second doped optical fiber.
8. The split-type laser according to claim 6, characterized in that, The first doped fiber is doped with thulium as a gain medium to generate the first laser with a wavelength of 1.9 μm; The second doped fiber is doped with holmium as a gain medium to generate the second laser with a wavelength of 2µm.
9. The split-type laser according to any one of claims 1 to 8, characterized in that, The laser output structure includes a first half-wave plate, a second half-wave plate, a first reflector, and a polarizing beam splitter. The first laser passes through the first half-wave plate and is reflected by the first reflector to the polarizing beam splitter. When the first laser passes through the polarizing beam splitter, part of it is reflected and emitted through the first output channel, and the other part passes through the polarizing beam splitter and is emitted through the second output channel. After the second laser passes through the second half-wave plate, part of it passes through the polarizing beam splitter and is emitted through the first output channel, while the other part is reflected and emitted through the second output channel.
10. The split-type laser according to claim 9, characterized in that, The laser output structure also includes a second reflector, which is disposed on the light propagation path in the second output channel to change the propagation direction of the light in the second output channel so that the light propagation direction in the second output channel is consistent with that in the first output channel. The laser output structure further includes a first collimating lens, a second collimating lens, a first focusing lens, and a second focusing lens. The first laser beam passes through the first collimating lens and then propagates to the first half-wave plate. The second laser beam passes through the second collimating lens and then propagates to the second half-wave plate. The light rays that propagate into the first output channel pass through the first focusing lens and are emitted outwards; The light rays that have traveled into the second output channel pass through the second focusing lens and are emitted outward.
11. A laser output structure for a laser, characterized in that, include: The first half-wave plate, the second half-wave plate, the first reflecting mirror, and the polarizing beam splitter; After the first laser passes through the first half-wave plate, it is reflected by the first mirror to the polarizing beam splitter. When the first laser passes through the polarizing beam splitter, part of it is reflected and emitted through the first output channel, and the other part passes through the polarizing beam splitter and is emitted through the second output channel. After the second laser passes through the second half-wave plate, part of it passes through the polarizing beam splitter and is emitted through the first output channel, while the other part is reflected and emitted through the second output channel.
12. The laser output structure of the laser according to claim 11, characterized in that, The laser output structure also includes a second reflector, which is disposed on the light propagation path in the second output channel to change the propagation direction of the light in the second output channel so that the light propagation direction in the second output channel is consistent with that in the first output channel. The laser output structure further includes a first collimating lens, a second collimating lens, a first focusing lens, and a second focusing lens. The first laser beam passes through the first collimating lens and then propagates to the first half-wave plate. The second laser beam passes through the second collimating lens and then propagates to the second half-wave plate. The light rays that propagate into the first output channel pass through the first focusing lens and are emitted outwards; The light rays that have traveled into the second output channel pass through the second focusing lens and are emitted outward.