Multi-pass disc amplifier based on laser beam combining system

Abstract

The utility model discloses a multi-pass disc amplifier based on a laser beam combining system, which comprises a seed light module used for outputting single-mode seed light; the pumping module is used for outputting multi-mode pumping light; the beam combining module is used for combining the single-mode seed light and the multi-mode pump light and outputting combined light containing the single-mode seed light and the multi-mode pump light; and the multi-optical-path disc amplification module is used for receiving the combined light and carrying out disc amplification processing on the combined light. According to the multi-pass disc amplifier provided by the utility model, the optical path of the disc amplifier can be adjusted more conveniently, so that the adjustment difficulty of the optical path in the disc amplifier is reduced, the overall structure of the disc amplifier is more compact, and the structural complexity of the disc amplifier is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of laser equipment, in particular to a multi-pass disc amplifier based on a laser beam combining system. Background Art

[0002] At present, ultrafast laser manufacturers mainly use fiber laser technology, but due to the limited area of ​​the fiber mode field, these ultrafast laser manufacturers are unable to achieve ultrafast pulse laser products with high peak power and high single pulse energy. Slab lasers and disk lasers are comparable to a certain extent. They mainly use a side-pumped structural design, which makes the product have the advantages of small size and simple cascading. However, in slab lasers, the beam needs to be shaped, which leads to a decrease in the output beam quality. Due to its unique structural design, the disk laser fundamentally solves the problem of thermal effects that cannot be avoided in traditional solid-state lasers. Its output beam has excellent beam quality and has the advantages of high peak power, high single pulse energy and high photoelectric conversion efficiency.

[0003] Disk lasers are generally composed of pump light, seed light and disk amplifier. Usually, the pump light and seed light are coupled into the disk amplifier system separately, which leads to a complex overall structure and difficulty in miniaturizing the product. It also increases the difficulty of adjusting the optical path system. Utility Model Content

[0004] The embodiment of the utility model provides a multi-pass disk amplifier based on a laser beam combining system, aiming to reduce the structural complexity of the disk amplifier and reduce the difficulty of adjusting the optical path in the disk amplifier.

[0005] The present invention provides a multi-pass disk amplifier based on a laser beam combining system, comprising:

[0006] A seed light module, used for outputting single-mode seed light;

[0007] A pump module, used for outputting multi-mode pump light;

[0008] A beam combining module, used for combining the single-mode seed light and the multi-mode pump light, and outputting a combined light including the single-mode seed light and the multi-mode pump light;

[0009] The multi-optical path disc amplification module is used to receive the combined light beam and perform disc amplification processing on the combined light beam.

[0010] Furthermore, the seed light module includes:

[0011] A seed light source, used for generating seed light;

[0012] A stretching unit, using a fiber chirped grating or a dispersion fiber, for stretching the pulse width of the seed light;

[0013] A first amplifying unit, used for performing a first power amplification process on the seed light after the broadening process;

[0014] A pulse selection unit, used for pulse modulating the seed light after the first power amplification process;

[0015] A second amplifying unit, used for pre-amplifying the optical signal of the pulse-modulated seed light;

[0016] The third amplifying unit is used to perform main amplification processing on the seed light after the pre-amplification processing and output the final seed light.

[0017] Further, the pump module includes a plurality of first multi-mode pumps, each of which includes a driving circuit and a multi-mode semiconductor laser;

[0018] The driving circuit includes a constant current circuit;

[0019] The output center wavelength of the multi-mode semiconductor laser is 940nm or 969nm.

[0020] Furthermore, the beam combining module includes a first beam combiner and a laser output head; wherein the first beam combiner is an (N+1)×1 beam combiner, N represents the number of pump ends, and 1 in (N+1) represents a seed light module.

[0021] Furthermore, the multi-optical path disc amplification module includes:

[0022] A collimating lens group, used for collimating the combined light beam;

[0023] A parabolic mirror, used for receiving and reflecting the combined light input by the collimating lens group;

[0024] A disk crystal is used to receive the combined light beam reflected by the parabolic mirror multiple times, and amplify the combined light beam and reflect it back to the parabolic mirror;

[0025] A prism group, which is provided with a plurality of prisms and is used to receive the combined light beam reflected by the parabolic mirror and reflect the combined light beam back to the parabolic mirror to form a 4f imaging system with the parabolic mirror;

[0026] The separation output unit is used to receive the combined light reflected by the parabolic mirror and separate the combined light into pump light and seed light.

[0027] Furthermore, the first beam combiner includes a pump input end, a signal input end, and a coupling output end;

[0028] The pump input end adopts a first multimode optical fiber, and the signal input end adopts a first double-clad optical fiber; the core diameter of the first multimode optical fiber is 200um, and the outer cladding diameter is 220um; the core diameter of the first double-clad optical fiber is 20um, and the outer cladding diameter is 130um, or the core diameter of the first double-clad optical fiber is 30um, and the outer cladding diameter is 250um;

[0029] The coupling output end adopts anti-resonance optical fiber.

[0030] Further, the antiresonant optical fiber includes a core region and a cladding region, and the cladding region includes an inner cladding region and an outer cladding region;

[0031] The inner cladding region includes one or more first cladding tubes, and the outer cladding region includes one second cladding tube; the core diameter of the antiresonant optical fiber is 40um, and the outer cladding diameter of the antiresonant optical fiber is 240um.

[0032] Furthermore, the seed light source is any one of a picosecond seed light source, a nanosecond seed light source and a femtosecond seed light source.

[0033] Further, the first amplification unit includes a single-clad ytterbium-doped optical fiber, a wavelength division multiplexer, a first single-mode pump and a first isolator;

[0034] The pulse selection unit adopts acousto-optic modulation or electro-optic modulation;

[0035] The second amplification unit includes a first double-clad ytterbium-doped optical fiber, a wavelength division multiplexer, a second single-mode pump, and a second isolator;

[0036] The third amplification unit includes a second combiner, a second multimode pump, a second double-clad ytterbium-doped optical fiber, a cladding power stripper and a third isolator; wherein the second combiner is a (2+1)×1 combiner.

[0037] Furthermore, the separation output unit is a dichroic mirror for reflecting the pump light and transmitting the seed light, and the dichroic mirror is coated with a 940-970nm reflective film and a 1030nm anti-reflection film.

[0038] The multi-pass disc amplifier based on the laser beam combining system provided in the embodiment of the utility model specifically includes a seed light module, a pump light module, a beam combining module and a multi-light-path disc amplifier module. In this embodiment, the single-mode seed light output by the seed light module and the multi-mode pump light output by the pump module are beam combined by the beam combining module, and then the combined light is input to the multi-light-path disc amplifier module for amplification and output, so that the combined coupling input and amplification of the pump light and the seed light can be achieved. The multi-pass disc amplifier provided in the embodiment of the utility model can more conveniently adjust the optical path of the disc amplifier, thereby reducing the difficulty of adjusting the optical path in the disc amplifier, and can also make the overall structure of the disc amplifier more compact, thereby reducing the complexity of the structure of the disc amplifier. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0040] Figure 1 A schematic diagram of the structure of a multi-pass disk amplifier based on a laser beam combining system provided by an embodiment of the utility model;

[0041] Figure 2 A schematic diagram of the structure of an anti-resonant optical fiber in a multi-pass disk amplifier based on a laser beam combining system provided by an embodiment of the utility model;

[0042] Figure 3 A schematic structural diagram of a multi-path disc amplifier module in a multi-path disc amplifier based on a laser beam combining system provided by an embodiment of the utility model. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0044] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0045] It should also be understood that the terms used in this utility model specification are only for the purpose of describing specific embodiments and are not intended to limit the utility model. As used in this utility model specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0046] It should be further understood that the term “and / or” used in the present specification and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0047] See below Figure 1 The embodiment of the utility model provides a multi-pass disk amplifier based on a laser beam combining system, comprising:

[0048] Seed light module 1, used for outputting single-mode seed light;

[0049] A pump module 2, used for outputting multi-mode pump light;

[0050] A beam combining module 3, used for combining the single-mode seed light and the multi-mode pump light, and outputting a combined light including the single-mode seed light and the multi-mode pump light;

[0051] The multi-optical path disc amplification module 4 is used to receive the combined light beam and perform disc amplification processing on the combined light beam.

[0052] The multi-pass disc amplifier based on the laser beam combining system described in this embodiment specifically includes a seed light module 1, a pump module 2, a beam combining module 3 and a multi-path disc amplifier module 4. In this embodiment, the single-mode seed light output by the seed light module 1 and the multi-mode pump light output by the pump module 2 are combined by the beam combining module 3, and then the combined light is input to the multi-path disc amplifier module 4 for amplification and output, so that the combined coupling input and amplification of the pump light and the seed light can be achieved. Compared with the prior art in which the pump light and the seed light are coupled and input separately and amplified, the multi-pass disc amplifier provided in this embodiment can more conveniently adjust the optical path of the disc amplifier, thereby reducing the difficulty of adjusting the optical path in the disc amplifier, and can also make the overall structure of the disc amplifier more compact, thereby reducing the complexity of the structure of the disc amplifier.

[0053] In one embodiment, the seed light module 1 includes:

[0054] A seed light source, used for generating seed light;

[0055] A stretching unit, using a fiber chirped grating or a dispersion fiber, for stretching the pulse width of the seed light;

[0056] A first amplifying unit, used for performing a first power amplification process on the seed light after the broadening process;

[0057] A pulse selection unit, used for pulse modulating the seed light after the first power amplification process;

[0058] A second amplifying unit, used for pre-amplifying the optical signal of the pulse-modulated seed light;

[0059] The third amplifying unit is used to perform main amplification processing on the seed light after the pre-amplification processing and output the final seed light.

[0060] The seed light module 1 described in this embodiment specifically includes a seed light source, a broadening unit, a first amplifying unit, a pulse selection unit, a second amplifying unit and a third amplifying unit. The seed light source is any one of a picosecond seed light source, a nanosecond seed light source and a femtosecond seed light source. For example, the seed light source is a picosecond seed light source, so that a picosecond pulse laser with a central wavelength of 1030nm and an output power greater than 400W can be achieved. The picosecond seed source commonly uses SESAM mode locking or NALM mode locking; the broadening module usually uses fiber chirped grating broadening or fiber dispersion broadening; the first amplifying unit performs a first power amplification process on the seed source; the pulse selection module is used to modulate the amplified pulse; the second amplifying unit performs pre-amplification processing on the modulated optical signal; and the third amplifying unit is used for main power amplification processing.

[0061] Specifically, the first amplification unit includes a single-clad ytterbium-doped optical fiber, a wavelength division multiplexer, a first single-mode pump and a first isolator; wherein the core diameter of the single-clad ytterbium-doped optical fiber is 6um, the cladding diameter is 125um, and the operating wavelength of the first single-mode pump is 976nm;

[0062] The pulse selection unit adopts acousto-optic modulation or electro-optic modulation;

[0063] The second amplification unit includes a first double-clad ytterbium-doped optical fiber, a wavelength division multiplexer, a second single-mode pump and a second isolator; wherein the core diameter of the first double-clad ytterbium-doped optical fiber is 10um, the outer cladding diameter is 125um, and the operating wavelength of the second single-mode pump is 976nm;

[0064] The third amplification unit includes a second combiner, a second multimode pump, a second double-clad ytterbium-doped fiber, a cladding power stripper and a third isolator; wherein the second combiner is a (2+1)×1 combiner. The core diameter of the second double-clad ytterbium-doped fiber is 20um, the outer cladding diameter is 130um, or the core diameter is 30um, the outer cladding diameter is 250um, and the operating wavelength of the second multimode pump is 976nm. In addition, the cladding power stripper (CPS) is used to strip excess pump light from the double-clad fiber (DCF).

[0065] In one embodiment, the pump module 2 includes a plurality of first multi-mode pumps 21, each of which includes a driving circuit and a multi-mode semiconductor laser;

[0066] The driving circuit includes a constant current circuit;

[0067] The output center wavelength of the multi-mode semiconductor laser is 940nm or 969nm.

[0068] In this embodiment, the pump module 2 includes multiple multi-mode pumps, the multi-mode pumps include a drive circuit and a multi-mode semiconductor laser, and the drive circuit includes a constant current circuit; the multi-mode semiconductor laser has an output power greater than 300W, and the output center wavelength is usually 940nm or 969nm, wherein the center wavelength 969nm semiconductor laser is a wavelength-locked laser. In some optional embodiments, the semiconductor laser module can be cooled by water cooling or other methods to improve its working effect.

[0069] It should also be noted that the reason why multiple multi-mode pumps are used in this embodiment is that a single multi-mode pump is limited by factors such as chip line width or manufacturing process, resulting in the power of a single multi-mode pump being difficult to reach the kilowatt level. Therefore, multiple multi-mode pumps are combined to achieve kilowatt-level pump output.

[0070] In one embodiment, the beam combining module 3 includes a first beam combiner 31 and a laser output head 32 ; wherein the first beam combiner 31 is an (N+1)×1 beam combiner, N represents the number of pump ends, and 1 in (N+1) represents the seed light module 1 .

[0071] Specifically, the first beam combiner 31 includes a pump input terminal 311, a signal input terminal 312 and a coupling output terminal 313;

[0072] The pump input end 311 adopts a first multimode optical fiber, and the signal input end 312 adopts a first double-clad optical fiber; the core diameter of the first multimode optical fiber is 200um, and the outer cladding diameter is 220um; the core diameter of the first double-clad optical fiber is 20um, and the outer cladding diameter is 130um, or the core diameter of the first double-clad optical fiber is 30um, and the outer cladding diameter is 250um;

[0073] The coupling output end 313 uses an anti-resonance optical fiber.

[0074] Further, combined with Figure 2 , the antiresonant optical fiber includes a core region 3131 and a cladding region, and the cladding region includes an inner cladding region 3132 and an outer cladding region 3133;

[0075] The inner cladding region 3132 includes one or more layers of first cladding tubes, and the outer cladding region 3133 includes one layer of second cladding tubes; the core diameter of the antiresonant optical fiber is 40um, and the outer cladding diameter of the antiresonant optical fiber is 240um.

[0076] In this embodiment, the beam combining module 3 includes an (N+1)×1 beam combiner and a QBH laser output head 32, wherein N in the (N+1)×1 beam combiner represents the number of pump ends, and N is usually 2, 4 or 6. The pump input end 311 of the first combiner 31 is usually a 200 / 220um multimode optical fiber, the signal input end 312 of the first combiner 31 is usually a 20 / 130um or 30 / 250um double-clad optical fiber, and the output end coupling optical fiber of the first combiner 31 uses an antiresonant optical fiber. The antiresonant optical fiber specifically includes a low-refractive index core region 3131 and a high-refractive index cladding region, and the high-refractive index cladding region is divided into two parts, namely an inner cladding region 3132 and an outer cladding region 3133. The inner cladding region 3132 is composed of one or more layers of cladding tubes, and the outer cladding is composed of a layer of cladding tubes with a certain thickness. The area surrounded by the inner cladding is a low-refractive index core region 3131, and the common core diameter is 40um, and the outer cladding diameter is 240um.

[0077] The output end of the first beam combiner 31 described in this embodiment adopts an antiresonant optical fiber, which can realize the transmission of single-mode picosecond seed light in the core of the antiresonant optical fiber, and the transmission of multimode pump light in the cladding of the antiresonant optical fiber, and the mode does not change during the transmission process. Compared with traditional optical fibers, antiresonant optical fibers guide light based on the antiresonance mechanism. This microstructured optical fiber has the characteristics of low loss value, good nonlinearity, flexible dispersion, and adjustable structural parameters.

[0078] This embodiment uses antiresonant optical fiber to ensure that the pump light and the seed light are transmitted in the optical fiber at the same time without changing the mode, so that the pump light and the seed light are coupled into the disk amplifier system at the same time, so as to achieve the effect of more convenient optical path adjustment and more compact structure of the disk amplifier.

[0079] In one embodiment, if Figure 3 As shown, the multi-path disc amplification module 4 includes:

[0080] A collimating lens group 41, used for collimating the combined light beam;

[0081] The parabolic mirror 42 is used to receive and reflect the combined light input by the collimating lens group 41;

[0082] The disk crystal 43 is used to receive the combined light beam reflected by the parabolic mirror 42 for multiple times, and amplify the combined light beam and reflect it back to the parabolic mirror 42;

[0083] A plurality of prism groups 44 are provided, and are used to receive the combined light beam reflected by the parabolic mirror 42, and reflect the combined light beam back to the parabolic mirror 42, so as to form a 4f imaging system with the parabolic mirror 42;

[0084] The separation output unit 45 is used to receive the combined light reflected by the parabolic mirror 42 and separate the combined light into pump light and seed light.

[0085] The multi-path disc amplification module 4 described in this embodiment mainly includes: a collimating lens group 41, a parabolic mirror 42, a disc crystal 43, a plurality of prism groups 44 and a separation output unit 45. Among them, the collimating lens group 41 can ensure that the light spot of the QBH output optical signal is adjustable; the parabolic mirror 42 is used to receive and reflect the pump light and the seed light; the disc crystal 43 is used to receive the pump light and the seed light reflected by the parabolic mirror 42 for multiple times, and amplify the pump light and the seed light and reflect them back to the parabolic mirror 42; the plurality of prism groups 44 are used to receive the pump light and the seed light reflected by the parabolic mirror 42, and reflect the pump light and the seed light back to the parabolic mirror 42, thereby forming a 4f imaging system with the parabolic mirror 42; the separation output unit 45 is used to receive the pump light and the seed light reflected by the parabola, and separate the pump light and the seed light. Specifically, the separation output unit 45 is a dichroic mirror for reflecting the pump light and transmitting the seed light, and the dichroic mirror is coated with a 940-970 nm reflective film and a 1030 nm anti-reflection film.

[0086] In a specific embodiment, taking picosecond seed light as an example, a picosecond laser with an output power greater than 50W of the picosecond seed light is transmitted to the first beam combiner 31 through a single-mode double-clad optical fiber. At the same time, multimode pump light output by a plurality of first multimode pumps 21 with a power greater than 300W is transmitted to the beam combiner through a multimode double-clad optical fiber, and is output to the anti-resonant optical fiber through the first beam combiner 31. At this time, the picosecond laser is transmitted in the core of the anti-resonant optical fiber. Since the light is transmitted in the air, the nonlinear effect is greatly reduced. The multimode pump light is transmitted in the cladding of the anti-resonant optical fiber. Finally, the multimode pump light and the single-mode picosecond seed light are output through the QBH, and the collimated light with adjustable spot size is output through the collimating lens group 41. The multimode pump light emitted by the pump light source and the picosecond seed light source is The multimode pump light and the picosecond laser are first incident on the parabolic mirror 42, and then the parabolic mirror 42 reflects the multimode pump light and the picosecond seed light to one of the multiple prism groups 44, and returns to the parabolic mirror 42 after completing the reflection in the prism group 44, and then reflects it to the disk crystal 43 by the parabolic mirror 42, and then amplified and reflected back to the parabolic mirror 42 by the disk crystal 43, and then continues to be amplified and reflected by the remaining prism groups 44, the parabolic mirror 42 and the disk crystal 43 until it passes through the prism group 44, and finally reflected by the parabolic mirror 42 to the separation output unit 45, and the multimode pump light is reflected by the separation output unit 45 to output a high-energy picosecond pulse laser with a wavelength of 1030nm and a power greater than 400W.

[0087] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referred to each other. For the system disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part description. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of this application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of this application.

[0088] It should also be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

Claims

1. A multi-pass disk amplifier based on a laser beam combining system, characterized in that: include: A seed light module, used for outputting single-mode seed light; A pump module, used for outputting multi-mode pump light; A beam combining module, used for combining the single-mode seed light and the multi-mode pump light, and outputting a combined light including the single-mode seed light and the multi-mode pump light; The multi-optical path disc amplification module is used to receive the combined light beam and perform disc amplification processing on the combined light beam.

2. The multi-pass disk amplifier based on the laser beam combining system according to claim 1, characterized in that: The seed light module comprises: A seed light source, used for generating seed light; A stretching unit, using a fiber chirped grating or a dispersion fiber, for stretching the pulse width of the seed light; A first amplifying unit, used for performing a first power amplification process on the seed light after the broadening process; A pulse selection unit, used for pulse modulating the seed light after the first power amplification process; A second amplifying unit, used for pre-amplifying the optical signal of the pulse-modulated seed light; The third amplifying unit is used to perform main amplification processing on the seed light after the pre-amplification processing and output the final seed light.

3. The multi-pass disk amplifier based on the laser beam combining system according to claim 1, characterized in that: The pump module includes a plurality of first multi-mode pumps, each of which includes a driving circuit and a multi-mode semiconductor laser; The driving circuit includes a constant current circuit; The output center wavelength of the multi-mode semiconductor laser is 940nm or 969nm.

4. The multi-pass disk amplifier based on the laser beam combining system according to claim 1, characterized in that: The beam combining module includes a first beam combiner and a laser output head; wherein the first beam combiner is an (N+1)×1 beam combiner, N represents the number of pump ends, and 1 in (N+1) represents a seed light module.

5. The multi-pass disk amplifier based on the laser beam combining system according to claim 1, characterized in that: The multi-optical path disc amplification module comprises: A collimating lens group, used for collimating the combined light beam; A parabolic mirror, used for receiving and reflecting the combined light input by the collimating lens group; A disk crystal is used to receive the combined light beam reflected by the parabolic mirror multiple times, and amplify the combined light beam and reflect it back to the parabolic mirror; A prism group, which is provided with a plurality of prisms and is used to receive the combined light beam reflected by the parabolic mirror and reflect the combined light beam back to the parabolic mirror to form a 4f imaging system with the parabolic mirror; The separation output unit is used to receive the combined light reflected by the parabolic mirror and separate the combined light into pump light and seed light.

6. The multi-pass disk amplifier based on the laser beam combining system according to claim 4, characterized in that: The first beam combiner comprises a pump input end, a signal input end and a coupling output end; The pump input end adopts a first multimode optical fiber, and the signal input end adopts a first double-clad optical fiber; the core diameter of the first multimode optical fiber is 200um, and the outer cladding diameter is 220um; the core diameter of the first double-clad optical fiber is 20um, and the outer cladding diameter is 130um, or the core diameter of the first double-clad optical fiber is 30um, and the outer cladding diameter is 250um; The coupling output end adopts anti-resonance optical fiber.

7. The multi-pass disk amplifier based on the laser beam combining system according to claim 6, characterized in that: The antiresonant optical fiber comprises a core region and a cladding region, and the cladding region comprises an inner cladding region and an outer cladding region; The inner cladding region includes one or more first cladding tubes, and the outer cladding region includes one second cladding tube; the core diameter of the antiresonant optical fiber is 40um, and the outer cladding diameter of the antiresonant optical fiber is 240um.

8. The multi-pass disk amplifier based on the laser beam combining system according to claim 2, characterized in that: The seed light source is any one of a picosecond seed light source, a nanosecond seed light source and a femtosecond seed light source.

9. The multi-pass disk amplifier based on the laser beam combining system according to claim 2, characterized in that: The first amplification unit includes a single-clad ytterbium-doped optical fiber, a wavelength division multiplexer, a first single-mode pump and a first isolator; The pulse selection unit adopts acousto-optic modulation or electro-optic modulation; The second amplification unit includes a first double-clad ytterbium-doped optical fiber, a wavelength division multiplexer, a second single-mode pump, and a second isolator; The third amplification unit includes a second combiner, a second multimode pump, a second double-clad ytterbium-doped optical fiber, a cladding power stripper and a third isolator; wherein the second combiner is a (2+1)×1 combiner.

10. The multi-pass disk amplifier based on the laser beam combining system according to claim 5, characterized in that: The separation output unit is a dichroic mirror for reflecting the pump light and transmitting the seed light, and the dichroic mirror is plated with a 940-970nm reflection film and a 1030nm anti-reflection film.

Images