A hollow core antiresonant optical fiber and its all-fiber ytterbium-doped optical fiber laser

Abstract

The present invention discloses a hollow-core antiresonant optical fiber and an all-fiber ytterbium-doped optical fiber laser, and relates to the field of optical communication and the technical field of optical fiber lasers. The hollow-core antiresonant optical fiber comprises: an air core, a semicircular and semi-elliptical cladding tube, an arc-shaped cladding tube and a peripheral cladding tube; the all-fiber ytterbium-doped optical fiber laser comprises: a pump laser with a central wavelength of 915nm or 976nm, a wavelength division multiplexer, an ytterbium-doped optical fiber, a polarization-independent isolator, a hollow-core antiresonant optical fiber, an output coupler, a graphene saturable absorber, a polarization controller and a single-mode optical fiber; the single-mode optical fiber is used as a connecting body to connect end to end in sequence, a double-clad ytterbium-doped optical fiber is used as a gain optical fiber, and a graphene saturable absorber is used as a mode-locking device to excite the resonant cavity to couple out a laser with a central wavelength of 1040nm to 1080nm. The present invention proposes a hollow-core antiresonant optical fiber with specific structural parameters, and uses the ring cavity composed of the hollow-core antiresonant optical fiber to build a laser, thereby improving the beam quality of the output laser.

Description

Technical Field

[0001] The present invention relates to the fields of optical communication and optical fiber laser technology, and in particular to a hollow-core anti-resonant optical fiber and an all-fiber ytterbium-doped optical fiber laser. Background Art

[0002] For ease of understanding, the professional terms involved in the present invention are as follows:

[0003] M 2 (Beam quality factor): Also known as the diffraction factor or quality factor of the beam, it is the ratio of the product of the actual beam waist width and the far-field divergence angle to the product of the ideal beam waist width and the far-field divergence angle. 2 The closer the value is to 1, the better the quality of the laser beam.

[0004] Anti-resonance wavelength Expression: To make light of different wavelengths anti-resonant in the cladding area, and reflected by the tube wall back to the core area to continue to propagate the anti-resonant wavelength The expression is:

[0005]

[0006] in, is the refractive index of the cladding tube; is the refractive index of the air core; is the cladding tube thickness; is a positive integer, representing the order of anti-resonance.

[0007] Fiber lasers are widely used in industrial precision processing, scientific research, and national defense due to their powerful power scalability, high-quality beam characteristics, excellent heat dissipation performance, and outstanding reliability. However, in fiber lasers, solid-core optical fibers have inherent deficiencies such as low material damage threshold, large dispersion, and strong nonlinear effects. These factors limit the energy carrying capacity of quartz optical fibers when transmitting lasers, and it is difficult to avoid fiber damage, which affects the output beam quality factor (M) of the laser. 2 ) and power improvement. Hollow-core antiresonant fiber has low nonlinearity and heat dissipation characteristics, which is expected to solve this scientific problem. The advantages of hollow-core antiresonant fiber combined with fiber lasers have become a research hotspot in the scientific community recently. In hollow-core antiresonant lasers, most of the light (>99.99%) can be transmitted in the hollow core, which can increase the optical damage threshold of quartz materials, significantly reduce nonlinear effects, and improve the laser output beam quality factor (M 2 ).

[0008] Chinese patent CN117673874A proposes a high-power fiber laser that combines double-clad gain chiral helical fiber, single-clad passive chiral helical fiber and hollow-core antiresonant fiber, using antiresonant fiber to improve beam quality. However, the specific size parameters and internal design structure of the hollow-core antiresonant fiber are not clear.

[0009] Chinese patent CN117394123A proposes an ytterbium-doped fiber laser based on hollow-core antiresonant fiber, with an output central wavelength of 1064nm. The addition of hollow-core antiresonant fiber promotes laser output. However, the proposed hollow-core antiresonant design adopts a classic six-clad circular tube. The conventional single-layer circular cladding tube has a poor loss limiting effect on the antiresonant fiber, which will reduce the output power and affect the output effect.

[0010] Chinese patent CN117477326A provides a laser based on hollow-core antiresonant fiber, which uses hollow-core antiresonant fiber to reduce the introduced dispersion and nonlinear effects. Its embodiment 3 uses a nonlinear polarization rotation mode-locking device, which requires a large number of components and a complex system that affects reliability. The patent does not disclose the specific size parameters and internal design structure of its hollow-core antiresonant fiber.

[0011] U.S. Patent US2013022060A1 proposes a hollow-core optical fiber-based beam transmission device, which uses hollow-core optical fibers to transmit high-energy pulses. However, its optical path does not adopt an all-fiber structure, and the spatial optical structure has poor anti-interference capabilities.

[0012] In summary, traditional fiber lasers cannot solve the scientific problems of nonlinearity and thermal damage well, and it is difficult to improve the laser's withstand power. Some patents involve the core-cladding structure design of hollow-core antiresonance, but the specific parameters are not disclosed; the mode-locking structure components of the laser are complex and difficult to reproduce; or the optical path structure of the laser is not stable enough and has poor anti-interference ability, which cannot meet the actual needs of the laser towards higher beam quality, higher material damage threshold, and greater output power. In order to solve the above problems, the present invention proposes a hollow-core antiresonant fiber and its all-fiber ytterbium-doped fiber laser. Summary of the invention

[0013] The purpose of the present invention is to provide a hollow core antiresonant fiber and an all-fiber ytterbium-doped fiber laser thereof to solve the problems raised in the background technology:

[0014] Traditional fiber lasers cannot solve the scientific problems of nonlinearity and thermal damage well, and it is difficult to increase the laser's withstand power. Some patents involve the core-cladding structure design of hollow core anti-resonance, but the specific parameters are not disclosed; the laser's mode-locking structure components are complex and difficult to reproduce; or the laser's optical path structure is not stable enough and has poor anti-interference ability, which cannot meet the actual needs of lasers for higher beam quality, higher material damage threshold, and greater output power.

[0015] In order to achieve the above object, the present invention adopts the following technical solutions:

[0016] A hollow core antiresonant optical fiber and an all-fiber ytterbium-doped optical fiber laser thereof, comprising: an air core, a semicircular and semi-elliptical cladding tube, an arc-shaped cladding tube and a peripheral cladding tube; the diameter of the air core ranges from 22.50 to 42.50 μm, the short semi-axis length of the semicircular and semi-elliptical cladding tube ranges from 13.28 to 16.57 μm, the long semi-axis length ranges from 33.20 to 47.34 μm, and the radius of the arc-shaped cladding tube ranges from 20.43 to 27.61 μm; the thickness of the semicircular and semi-elliptical cladding tube and the arc-shaped cladding tube ranges from 0.42 to 0.76 μm; the cladding tubes are all made of glass, and the rest is filled with air; the refractive index of the glass at a wavelength of 1064 nm ranges from 1.4483 to 1.4520.

[0017] Preferably, the anti-resonance region of the hollow-core anti-resonance optical fiber is in the 880-1180 nm band, and its limiting loss is lower than 0.023 dB / km.

[0018] The invention discloses an all-fiber ytterbium-doped fiber laser of a hollow core anti-resonance fiber. The ring cavity of the fiber laser contains a hollow core anti-resonance fiber. The fiber laser comprises: a pump laser, a wavelength division multiplexer, an ytterbium-doped fiber, a polarization-independent isolator, a hollow core anti-resonance fiber, an output coupler, a graphene saturable absorber, a polarization controller and a single-mode fiber. The pump laser is used as a pump source, and a connection end is connected to the polarization controller through one end of the wavelength division multiplexer, and the other end of the wavelength division multiplexer is connected to the gain medium ytterbium-doped fiber, and then connected to one end of the hollow core anti-resonance fiber through the polarization-independent isolator. The other end of the hollow core anti-resonance fiber is connected to one end of the output coupler, and two branches are led out from the other end of the output coupler, one branch couples and outputs part of the laser light, and the other branch is connected to one end of a passive mode locking device composed of a graphene saturable absorber, and the other end of the passive mode locking device is connected to the polarization controller, and the connection body between the various components is a passive single-mode fiber.

[0019] Preferably, the central wavelength of the pump laser is 915 nm or 976 nm.

[0020] Preferably, the ytterbium-doped optical fiber is a double-cladding structure, with a core diameter ranging from 9.00 to 11.00 μm, a numerical aperture ranging from 0.04 to 0.10, and a doped ytterbium ion concentration ranging from 2500.00 to 10000.00 ppm.

[0021] Preferably, the output coupler has an operating wavelength range of 1040-1080 nm, and a light splitting ratio of 6:4 or 7:3.

[0022] Preferably, the laser output wavelength range is 1040-1080 nm, and the beam quality factor is better than 1.2.

[0023] Compared with the prior art, the present invention provides a hollow-core antiresonant fiber and an all-fiber ytterbium-doped fiber laser thereof, which have the following beneficial effects:

[0024] The present invention designs and develops a hollow-core antiresonant optical fiber with specific structural parameters, which not only achieves the goal of confining light of a specific wavelength in an air core for transmission, improves nonlinear damage, reduces transmission loss, increases output power and improves beam quality. The structural features of the hollow-core antiresonant optical fiber are also defined, which is composed of an air core, four semicircular and semi-elliptical cladding tubes and four arc-shaped cladding tubes, as well as cladding tubes on the periphery thereof, which reduces transmission loss, increases material damage threshold and increases application reliability. The laser of the present invention adopts a ring cavity composed of hollow-core antiresonant optical fibers, and the mode-locking structure adopts a graphene saturable absorber, which has good structural integration, high reliability and strong anti-interference ability. The laser has good single-mode characteristics and heat resistance characteristics, and the antiresonant hollow-core structure is conducive to improving the quality of the laser output beam, reducing the stimulated Raman effect and improving the transverse mode instability. The present invention is suitable for optical fiber lasers that output high beam quality, and has broad application prospects in future high-power light sources. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the cross-sectional structure of the semicircular and semi-elliptical cladding tube and the arc-shaped cladding tube mentioned in Examples 1-3 of the present invention;

[0026] Figure 2 This is a schematic diagram of the cross-sectional structure of the hollow-core antiresonant optical fiber mentioned in Embodiments 1-3 of the present invention;

[0027] Figure 3 A schematic diagram of a curve showing a change in limiting loss versus wavelength of a hollow-core antiresonant optical fiber mentioned in an embodiment of the present invention;

[0028] Figure 4 Schematic diagram of the structure of the all-fiber ytterbium-doped laser mentioned in Examples 1-3 of the present invention.

[0029] Meaning of the symbols in the figure:

[0030] 1. Pump laser; 2. Wavelength division multiplexer; 3. Ytterbium-doped fiber; 4. Polarization-independent isolator; 5. Hollow core antiresonant fiber; 6. Output coupler; 7. Graphene saturable absorber; 8. Polarization controller; 9. Single-mode fiber. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0032] The present invention designs and develops a hollow core antiresonant optical fiber with specific structural parameters, which not only achieves the goal of confining light of a specific wavelength in an air core for transmission, improves nonlinear damage, reduces transmission loss, increases output power and improves beam quality. The structural features of the hollow core antiresonant optical fiber are also defined, which is composed of an air core, four semicircular and semi-elliptical cladding tubes and four arc-shaped cladding tubes, as well as cladding tubes on the periphery thereof, which reduces transmission loss, increases material damage threshold and increases application reliability. The laser of the present invention adopts a ring cavity composed of hollow core antiresonant optical fibers, and the mode-locking structure adopts a graphene saturable absorber, which has good structural integration, high reliability and strong anti-interference ability. The laser has good single-mode characteristics and heat resistance characteristics, and the antiresonant hollow core structure is conducive to improving the quality of the laser output beam, reducing the stimulated Raman effect and improving the transverse mode instability. The present invention is suitable for optical fiber lasers that output high beam quality and has broad application prospects in future high-power light sources. Specifically, it includes the following contents.

[0033] See also Figure 1-3 The present invention discloses a hollow core antiresonant optical fiber, comprising: an air core, four semicircular and semi-elliptical cladding tubes and four arc-shaped cladding tubes, and an outer cladding tube, wherein the cladding tubes are made of glass, which may be quartz glass or other glass, and the rest is filled with air, which may refer to Figure 1 , 2 , Figure 1 Figure (a) shows the cross section of a semicircular and semi-elliptical cladding tube. Figure 1 The middle (b) figure shows the cross section of the arc-shaped cladding tube. The diameter of the air core D_core ranges from 22.50 to 42.50 μm, and the short semi-axis r of the semicircular and semi-elliptical cladding tube is y The length range is 13.28~16.57μm, and the major semi-axis r x The length range is 33.20~47.34μm, and the radius of the arc-shaped cladding tube is r sThe range is 20.43-27.61μm; the thickness t of the semicircular and semi-elliptical cladding tubes and the arc cladding tubes is in the range of 0.42~0.76μm; where T is the thickness of the outer cladding tube; the refractive index n1 of glass at a wavelength of 1064nm ranges from 1.4483 to 1.4520, and the refractive index n0 of air is equal to 1. The anti-resonance region of the hollow-core anti-resonant fiber 5 is the 880~1180nm band, and its limiting loss is less than 0.023dB / km. For details, please refer to Figure 3 The small figure in the upper right corner of the figure shows the three-dimensional contour of the fundamental mode electric field intensity.

[0034] Reference Figure 4 The present invention discloses an all-fiber ytterbium-doped fiber laser of a hollow-core anti-resonant fiber. The all-fiber design structure is adopted. The ring cavity of the fiber laser contains a hollow-core anti-resonant fiber 5. The fiber laser comprises: a pump laser 1, a wavelength division multiplexer 2, an ytterbium-doped fiber 3, a polarization-independent isolator 4, a hollow-core anti-resonant fiber 5, an output coupler 6, a graphene saturable absorber 7, a polarization controller 8 and a single-mode fiber 9. The ytterbium-doped fiber 3 is used as a gain fiber, and a pump laser 1 with a central wavelength of 915nm or 976nm is used as a pump source. The connection end is connected to the polarization controller 8 through one end of the wavelength division multiplexer 2, and the other end of the wavelength division multiplexer 2 is connected to the polarization controller 8. The gain medium ytterbium-doped fiber 3 is connected to the polarization-independent isolator 4, which ensures the direction of laser propagation, and then connected to one end of the hollow-core anti-resonance fiber 5 to reduce the nonlinear effect in the cavity and improve the quality of the beam output. The other end of the hollow-core anti-resonance fiber 5 is connected to one end of the output coupler 6. The other end of the output coupler 6 leads to two branches, one of which couples and outputs 40% or 30% of the laser; the other branch is connected to one end of the passive mode-locking device composed of a graphene saturable absorber 7. The other end of the passive mode-locking device is connected to a polarization controller 8 to adjust the polarization direction in the cavity. The connection sections between each component are all single-mode optical fibers 9. The ytterbium-doped fiber 3 is a double-cladding structure, with a core diameter ranging from 9.00 to 11.00 μm, a numerical aperture ranging from 0.04 to 0.10, and a doped ytterbium ion concentration ranging from 2500.00 to 10000.00 ppm. The working band of the laser is located in the anti-resonance region of the optical fiber. The central wavelength of the laser output is 1040-1080nm, and the beam quality factor (M 2 ) is better than 1.2.

[0035] The internal structural parameters of the hollow core antiresonant optical fiber 5 and the specific connection structure of the laser can be specifically referred to in Examples 1-3.

[0036] Embodiment 1:

[0037] Reference Figure 1 , 2The present invention discloses a hollow core anti-resonant optical fiber, comprising: an air core, four semicircular and semi-elliptical cladding tubes and four arc-shaped cladding tubes, and an outer cladding tube, wherein the cladding tubes are made of glass and the rest is filled with air. Figure 1 , 2 The diameter of the air core D_core is 22.50 μm, and the short semi-axis r of the semi-circular and semi-elliptical cladding tube is y The length is 13.28 μm, and the major semi-axis r x The length is 33.20 μm, and the radius of the arc-shaped cladding tube is r s is 20.43 μm; the thickness t of the semicircular and semi-elliptical cladding tube and the arc cladding tube is 0.42 μm; T is the thickness of the outer cladding tube; the refractive index n1 of glass at a wavelength of 1064 nm is 1.4483, and the refractive index n0 of air is equal to 1. The antiresonance wavelength of the hollow core antiresonant optical fiber 5 is 880 nm, and its limiting loss is less than 0.021 dB / km.

[0038] Reference Figure 4 The present invention discloses an all-fiber ytterbium-doped fiber laser of a hollow-core anti-resonant fiber. The ring cavity of the fiber laser contains a hollow-core anti-resonant fiber 5. The fiber laser comprises: a pump laser 1 with a central wavelength of 915 nm, a wavelength division multiplexer 2, an ytterbium-doped fiber 3, a polarization-independent isolator 4, a hollow-core anti-resonant fiber 5, an output coupler 6, a graphene saturable absorber 7, a polarization controller 8 and a single-mode fiber 9; the pump laser 1 is used as a pump source, and the connection end is connected to the polarization controller through one end of the wavelength division multiplexer 2. The other end of the wavelength division multiplexer 2 is connected to the gain medium ytterbium-doped fiber 3, which is then connected to one end of the hollow core anti-resonance fiber 5 through the polarization-independent isolator 4. The other end of the hollow core anti-resonance fiber 5 is connected to one end of the output coupler 6. The other end of the output coupler 6 leads to two branches, one of which couples and outputs 30% of the laser; the other branch is connected to one end of the passive mode-locking device composed of a graphene saturable absorber 7, and the other end of the passive mode-locking device is connected to a polarization controller 8. The connection sections between each component are all made of single-mode optical fiber 9. The ytterbium-doped fiber 3 is a double-cladding structure with a core diameter of 9.00μm, a numerical aperture of 0.04, and an ytterbium ion concentration of 2500.00ppm. The laser output laser center wavelength is 1040nm, and the beam quality factor (M 2 ) is 1.05.

[0039] Embodiment 2:

[0040] Reference Figure 1 , 2 The present invention discloses a hollow core anti-resonant optical fiber, comprising: an air core, four semicircular and semi-elliptical cladding tubes and four arc-shaped cladding tubes, and an outer cladding tube, wherein the cladding tubes are made of glass and the rest is filled with air. Figure 1 , 2The diameter of the air core D_core is 42.50 μm, and the short semi-axis r of the semi-circular and semi-elliptical cladding tube is y The length is 16.57 μm, and the major semi-axis r x The length is 47.34 μm, and the radius of the arc-shaped cladding tube is r s is 27.61 μm; the thickness t of the semicircular and semi-elliptical cladding tube and the arc-shaped cladding tube is 0.76 μm; T is the thickness of the outer cladding tube; the refractive index n1 of glass at a wavelength of 1064 nm is 1.4520, and the refractive index n0 of air is equal to 1. The anti-resonance region of the hollow-core anti-resonant optical fiber 5 is the 1180 nm band, and its limiting loss is less than 0.023 dB / km.

[0041] Reference Figure 4 The present invention discloses an all-fiber ytterbium-doped fiber laser of a hollow-core anti-resonant fiber. The ring cavity of the fiber laser contains a hollow-core anti-resonant fiber 5. The fiber laser comprises: a pump laser 1 with a central wavelength of 976 nm, a wavelength division multiplexer 2, an ytterbium-doped fiber 3, a polarization-independent isolator 4, a hollow-core anti-resonant fiber 5, an output coupler 6, a graphene saturable absorber 7, a polarization controller 8 and a single-mode fiber 9; the pump laser 1 is used as a pump source, and the connection end is introduced into the fiber oscillator cavity through one end of the wavelength division multiplexer 2. The other end of the wavelength division multiplexer 2 is connected to the gain medium ytterbium-doped fiber 3, which is then connected to one end of the hollow core anti-resonance fiber 5 through the polarization-independent isolator 4. The other end of the hollow core anti-resonance fiber 5 is connected to one end of the output coupler 6. The other end of the output coupler 6 leads to two branches, one of which couples and outputs 30% of the laser; the other branch is connected to one end of the passive mode-locking device composed of a graphene saturable absorber 7, and the other end of the passive mode-locking device is connected to a polarization controller 8. The connection sections between each component are all made of single-mode optical fiber 9. The ytterbium-doped fiber 3 is a double-cladding structure with a core diameter of 11.00μm, a numerical aperture of 0.10, and a doped ytterbium ion concentration of 10000.00ppm. The laser output laser center wavelength is 1080nm, and the beam quality factor (M 2 ) is 1.08.

[0042] Embodiment 3:

[0043] Reference Figure 1 , 2 The present invention discloses a hollow core anti-resonant optical fiber, comprising: an air core, four semicircular and semi-elliptical cladding tubes and four arc-shaped cladding tubes, and an outer cladding tube, wherein the cladding tubes are made of glass and the rest is filled with air. Figure 1 , 2 The diameter of the air core D_core is 35.00 μm, and the short semi-axis r of the semi-circular and semi-elliptical cladding tube is y The length is 14.50 μm, and the major semi-axis r xThe length is 38.00 μm, and the radius of the arc-shaped cladding tube is r s is 23.75 μm; the thickness t of the semicircular and semi-elliptical cladding tube and the arc cladding tube is 0.76 μm; T is the thickness of the outer cladding tube; the refractive index n1 of glass at a wavelength of 1064 nm is 1.4496, and the refractive index n0 of air is equal to 1. The antiresonance wavelength of the hollow core antiresonant optical fiber 5 is in the 1064 nm band, and its limiting loss is less than 0.011 dB / km.

[0044] Reference Figure 4 The present invention discloses an all-fiber ytterbium-doped fiber laser of a hollow-core anti-resonant fiber. The ring cavity of the fiber laser contains a hollow-core anti-resonant fiber 5. The fiber laser comprises: a pump laser 1 with a central wavelength of 976 nm, a wavelength division multiplexer 2, an ytterbium-doped fiber 3, a polarization-independent isolator 4, a hollow-core anti-resonant fiber 5, an output coupler 6, a graphene saturable absorber 7, a polarization controller 8 and a single-mode fiber 9; the pump laser 1 is used as a pump source, and the connection end is introduced into the fiber oscillator cavity through one end of the wavelength division multiplexer 2. The other end of the wavelength division multiplexer 2 is connected to the gain medium ytterbium-doped fiber 3, which is then connected to one end of the hollow core anti-resonance fiber 5 through the polarization-independent isolator 4. The other end of the hollow core anti-resonance fiber 5 is connected to one end of the output coupler 6. The other end of the output coupler 6 leads to two branches, one of which couples and outputs 30% of the laser; the other branch is connected to one end of the passive mode-locking device composed of a graphene saturable absorber 7. The other end of the passive mode-locking device is connected to a polarization controller 8. The connection sections between each component are all made of single-mode optical fiber 9. The ytterbium-doped fiber 3 is a double-cladding structure with a core diameter of 10.00μm, a numerical aperture of 0.08, and a doped ytterbium ion concentration of 8000.00ppm. The laser output laser center wavelength is 1064nm, and the beam quality factor (M 2 ) is 1.20.

[0045] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An all-fiber ytterbium-doped fiber laser of a hollow-core antiresonant fiber, characterized in that: The fiber laser has a hollow core anti-resonant fiber (5) in its ring cavity. The fiber laser comprises: a pump laser (1), a wavelength division multiplexer (2), an ytterbium-doped fiber (3), a polarization-independent isolator (4), a hollow core anti-resonant fiber (5), an output coupler (6), a graphene saturable absorber (7), a polarization controller (8) and a single-mode fiber (9); the pump laser (1) is used as a pump source, and its connection end is connected to the polarization controller (8) through one end of the wavelength division multiplexer (2), and the other end of the wavelength division multiplexer (2) is connected to the polarization controller (8). One end is connected to a gain medium ytterbium-doped optical fiber (3), and then connected to one end of a hollow core anti-resonance optical fiber (5) via a polarization-independent isolator (4); the other end of the hollow core anti-resonance optical fiber (5) is connected to one end of an output coupler (6); two branches are led out from the other end of the output coupler (6); one branch couples and outputs part of the laser light; the other branch is connected to one end of a passive mode-locking device composed of a graphene saturable absorber (7); the other end of the passive mode-locking device is connected to a polarization controller (8); and the connecting body between the various components is a passive single-mode optical fiber (9); The hollow-core antiresonant optical fiber comprises: an air core, a semicircular and semi-elliptical cladding tube, an arc-shaped cladding tube and an outer cladding tube; the diameter of the air core ranges from 22.50 to 42.50 μm, the short semi-axis length of the semicircular and semi-elliptical cladding tube ranges from 13.28 to 16.57 μm, the long semi-axis length ranges from 33.20 to 47.34 μm, and the radius of the arc-shaped cladding tube ranges from 20.43 to 27.61 μm; the thickness of the semicircular and semi-elliptical cladding tube and the arc-shaped cladding tube ranges from 0.42 to 0.76 μm; the cladding tubes are all made of glass, and the rest is filled with air; the refractive index of the glass at a wavelength of 1064 nm ranges from 1.4483 to 1.4520.

2. The hollow-core antiresonant fiber all-fiber ytterbium-doped fiber laser according to claim 1, characterized in that: The anti-resonance region of the hollow-core anti-resonance optical fiber (5) is in the 880-1180 nm band, and its limiting loss is less than 0.023 dB / km.

3. The all-fiber ytterbium-doped fiber laser of a hollow-core anti-resonant fiber according to claim 1, characterized in that: The central wavelength of the pump laser (1) is 915 nm or 976 nm.

4. The all-fiber ytterbium-doped fiber laser of a hollow-core antiresonant fiber according to claim 1, characterized in that: The ytterbium-doped optical fiber (3) is a double-cladding structure, with a core diameter ranging from 9.00 to 11.00 μm, a numerical aperture ranging from 0.04 to 0.10, and a doped ytterbium ion concentration ranging from 2500.00 to 10000.00 ppm.

5. The hollow-core antiresonant fiber all-fiber ytterbium-doped fiber laser according to claim 1, characterized in that: The output coupler (6) has an operating wavelength range of 1040-1080 nm, and a light splitting ratio of 6:4 or 7:

3.

6. The hollow-core antiresonant fiber all-fiber ytterbium-doped fiber laser according to claim 1, characterized in that: The laser output wavelength range is 1040-1080nm, and the beam quality factor is better than 1.2.

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