CN220753997U - Fiber laser based on MOPA structure - Google Patents

Abstract

The embodiment of the utility model discloses an optical fiber laser based on a MOPA structure, which comprises: a seed light source; the optical fiber amplifier comprises a first inclined grating, a first cladding light stripper, a first active optical fiber, a second inclined grating, a beam combiner, at least one first pumping source and a first transmission optical fiber; the first inclined grating comprises a first input end and a first output end, and the first input end is connected with the seed light source; the first cladding light stripper comprises a second input end and a second output end, and the second input end is connected with the first output end; the first active optical fiber comprises a third input end and a third output end, and the third input end is connected with the second output end; the second inclined grating comprises a fourth input end and a fourth output end, and the fourth input end is connected with the third output end; the beam combiner comprises a fifth input end and a fifth output end, wherein the fifth input end is connected with the fourth output end, the fifth output end is connected with the first pumping source, and the fifth output end outputs amplified laser.

Description

Fiber laser based on MOPA structure

Technical Field

The embodiment of the utility model relates to the technical field of lasers, in particular to an optical fiber laser based on a MOPA structure.

Background

At present, a high-power continuous fiber laser adopts two modes of optical paths, wherein the first mode is MOPA structure, high-power continuous light output is realized by adopting a seed source and amplifier structure, and the second mode is to adopt grating as a resonant cavity for direct output. In a high-power continuous fiber laser, the beam quality of the output laser directly affects the use of the laser, but in the laser amplification process, the spontaneous emission is amplified along the gain fiber to form stimulated Amplified Spontaneous Emission (ASE), and the ASE can be transmitted along the fiber, so that a large number of upper-level particles are consumed, the energy extraction efficiency of the seed light to be amplified is reduced, and the efficiency of the fiber amplifier is seriously affected.

Disclosure of Invention

The embodiment of the utility model provides an optical fiber laser based on a MOPA structure, which outputs a laser beam with the wavelength of 1550nm and the power of 50W, and has the advantages of long-term stability, high beam quality, good heat treatment and quasi-fundamental mode output.

The embodiment of the utility model provides an optical fiber laser based on a MOPA structure, which comprises the following components:

a seed light source;

the optical fiber amplifier comprises a first inclined grating, a first cladding light stripper, a first active optical fiber, a second inclined grating, a beam combiner, at least one first pumping source and a first transmission optical fiber;

the first inclined grating comprises a first input end and a first output end, and the first input end is connected with the seed light source through the first transmission optical fiber;

the first cladding light stripper comprises a second input end and a second output end, and the second input end is connected with the first output end through the first transmission optical fiber;

the first active optical fiber comprises a third input end and a third output end, and the third input end is connected with the second output end through the first transmission optical fiber;

the second inclined grating comprises a fourth input end and a fourth output end, and the fourth input end is connected with the third output end through the first transmission optical fiber;

the beam combiner comprises a fifth input end and a fifth output end, wherein the fifth input end is connected with the fourth output end through the first transmission optical fiber, the fifth output end is connected with the first pumping source through the first transmission optical fiber, and the fifth output end outputs amplified laser.

Optionally, the central wavelength of the first inclined grating is 1020nm-1055nm, and the insertion loss of the first inclined grating is 0.15dB;

the center wavelength of the second inclined grating is 1020nm-1055nm, and the insertion loss of the second inclined grating is 0.15dB.

Optionally, the method further comprises:

the optical isolator is positioned between the seed light source and the optical fiber amplifier, and two ends of the optical isolator are respectively connected with the seed light source and the first input end through the first transmission optical fiber.

Optionally, the method further comprises:

and the output light regulator is connected with the fifth output end through the first transmission optical fiber.

Optionally, the output light regulator comprises a third inclined grating, a second cladding light stripper and a second transmission optical fiber;

the third inclined grating comprises a sixth input end and a sixth output end, and the sixth input end is connected with the fifth output end through the first transmission optical fiber;

the second cladding light stripper comprises a seventh input end and a seventh output end, the seventh input end is connected with the sixth output end through the second transmission optical fiber, and the seventh output end outputs the amplified laser after adjustment.

Optionally, the seed light source comprises a high-reflection grating, a second pump source, a second active optical fiber, a low-reflection grating and a third transmission optical fiber;

the second active optical fiber is positioned between the high-reflection grating and the low-reflection grating;

the second active optical fiber comprises an eighth input end and an eighth output end, and the eighth input end is respectively connected with the high-reflection grating and the second pumping source through the third transmission optical fiber;

the low reflection grating comprises a ninth input end and a ninth output end, and the ninth input end is connected with the eighth output end through the third transmission optical fiber; the ninth output end is connected with the first input end through the first transmission optical fiber.

Optionally, the seed light source further comprises a third cladding light stripper;

the third cladding light stripper is positioned between the second active optical fiber and the low reflection grating, and two ends of the third cladding light stripper are respectively connected with the second active optical fiber and the ninth input end of the low reflection grating through the third transmission optical fiber.

Optionally, the seed light source further comprises a passive optical fiber;

the passive optical fiber is positioned between the high-reflection grating and the second active optical fiber, and two ends of the passive optical fiber are respectively connected with the high-reflection grating and the eighth input end of the second active optical fiber through the third transmission optical fiber.

Optionally, the first active optical fiber, the first transmission optical fiber and the second transmission optical fiber are single mode optical fibers;

the model of the first active optical fiber is IXF-2CF-EY-O-12-130-L3, and the length of the first active optical fiber ranges from 5m to 7m.

Optionally, the second active optical fiber and the third transmission optical fiber are single mode optical fibers;

the model of the second active optical fiber is IXF-2CF-EY-O-12-130-L3, and the length of the second active optical fiber ranges from 5m to 7m.

The embodiment of the utility model provides an optical fiber laser based on a MOPA structure, which comprises: a seed light source; the optical fiber amplifier comprises a first inclined grating, a first cladding light stripper, a first active optical fiber, a second inclined grating, a beam combiner, at least one first pumping source and a first transmission optical fiber; the first inclined grating comprises a first input end and a first output end, and the first input end is connected with the seed light source through a first transmission optical fiber; the first cladding light stripper comprises a second input end and a second output end, and the second input end is connected with the first output end through a first transmission optical fiber; the first active optical fiber comprises a third input end and a third output end, and the third input end is connected with the second output end through a first transmission optical fiber; the second inclined grating comprises a fourth input end and a fourth output end, and the fourth input end is connected with the third output end through a first transmission optical fiber; the beam combiner comprises a fifth input end and a fifth output end, wherein the fifth input end is connected with the fourth output end through a first transmission optical fiber, the fifth output end is connected with the first pumping source through the first transmission optical fiber, and the fifth output end outputs amplified laser. The optical fiber laser utilizes the first inclined grating, the first cladding light stripper and the second inclined grating to filter out ASE of 1 mu m and unutilized pump light so as to ensure the quality of laser light output by a fiber core, effectively reduce the light power of amplified spontaneous emission light output, and facilitate the improvement of the gain and the signal-to-noise ratio of an optical fiber amplifier to realize high-gain amplification.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a fiber laser based on MOPA structure according to an embodiment of the present utility model;

FIG. 2 is a spectral diagram of an amplified laser output after conditioning according to an embodiment of the present utility model.

Detailed Description

The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present utility model are shown in the drawings.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present utility model and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the utility model described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Fig. 1 is a schematic structural diagram of a fiber laser based on MOPA structure according to an embodiment of the present utility model, and as shown in fig. 1, the fiber laser includes a seed light source 10 and a fiber amplifier 20. The optical fiber amplifier 20 comprises a first inclined grating 21, a first cladding light stripper 22, a first active optical fiber 23, a second inclined grating 24, a beam combiner 25, at least one first pump source 26 and a first transmission optical fiber 27; the first inclined grating 21 comprises a first input end and a first output end, wherein the first input end is connected with the seed light source 10 through a first transmission optical fiber 27; the first cladding light stripper 22 comprises a second input end and a second output end, and the second input end is connected with the first output end through a first transmission optical fiber 27; the first active optical fiber 23 includes a third input end and a third output end, and the third input end and the second output end are connected through a first transmission optical fiber 27; the second inclined grating 24 comprises a fourth input end and a fourth output end, and the fourth input end and the third output end are connected through a first transmission optical fiber 27; the beam combiner 25 includes a fifth input end and a fifth output end, the fifth input end is connected to the fourth output end through a first transmission optical fiber 27, the fifth output end is connected to the first pump source 26 through the first transmission optical fiber 27, and the fifth output end outputs amplified laser light.

Specifically, the fiber laser includes a seed light source 10 and a fiber amplifier 20. The optical fiber amplifier 20 includes a first inclined grating 21, a first cladding light stripper 22, a first active optical fiber 23, a second inclined grating 24, a beam combiner 25, at least one first pump source 26, and a first transmission optical fiber 27. The seed light source 10 may output seed laser to the first active optical fiber 23, the fifth output end of the beam combiner 25 is connected to at least one first pump source 26 through the first transmission optical fiber 27, the first pump source 26 may emit pump light, the beam combiner 25 may receive the pump light, that is, the optical fiber amplifier 20 is in reverse amplification, the beam combiner 25 may couple the received pump light into the first active optical fiber 23 to amplify the seed laser to be amplified, so as to obtain amplified laser, and output the amplified laser at the fifth output end of the beam combiner 25.

On this basis, in order to obtain amplified laser with advantages of long-term stability, high beam quality, good heat treatment and quasi-fundamental mode output, a first inclined grating 21 is added between the seed light source 10 and the first active optical fiber 23, the first active optical fiber 23 comprises a third input end and a third output end, the first inclined grating 21 comprises a first input end and a first output end, the first input end is connected with the seed light source 10 through a first transmission optical fiber 27, the seed light source 10 can output seed laser to the first inclined grating 21, when the seed laser enters the first inclined grating 21, due to a certain angle between a grating surface of the first inclined grating 21 and the radial direction of the first transmission optical fiber 27, stimulated Amplified Spontaneous Emission (ASE) of 1 μm is reflected and then enters a cladding from the fiber core, continuous transmission is not performed in the fiber core, and light in the rest wavelength ranges is not reflected and is directly transmitted through the first inclined grating 21, so that an effective filtering effect of 1 μm ASE of forward transmission is realized. Similarly, a second inclined grating 24 is added between the first active optical fiber 23 and the beam combiner 25, the first active optical fiber 23 includes a third input end and a third output end, the second inclined grating 24 includes a fourth input end and a fourth output end, the beam combiner 25 includes a fifth input end and a fifth output end, the fourth input end is connected with the third output end through a first transmission optical fiber 27, the fifth input end is connected with the fourth output end through the first transmission optical fiber 27, during the laser generating process, particles at an upper energy level spontaneously transit to a lower energy level to generate spontaneous emission, during the laser amplifying process, the spontaneous emission is amplified along a gain optical fiber to form ASE, and the ASE within the numerical aperture of the optical fiber can be transmitted along the optical fiber to form a large amount of forward and reverse transmitted broadband ASE, and the second inclined grating 24 can realize an effective filtering effect on the ASE of 1 μm transmitted reversely. And, add the first cladding light stripper 22 between first inclined grating 21 and first active optical fiber 23, the first cladding light stripper 22 includes the second input end and second output end, the second input end is connected with first output end through the first transmission optical fiber 27, the third input end is connected with second output end through the first transmission optical fiber 27, the first cladding light stripper 22 can strip 1 μm ASE that the first inclined grating 21 reflects into the cladding, the first cladding light stripper 22 can strip 1 μm ASE that the second inclined grating 24 reflects into the cladding, the first cladding light stripper 22 can strip pump light (940 nm) that is not used in the laser amplification process, the temperature rise coefficient of the first cladding light stripper 22 can be 0.2 ℃/W, the power of the maximum stripped cladding light can be 200W, the heat dissipation performance of the first cladding light stripper 22 is good.

It should be noted that, the optical fiber amplifier 20 according to the embodiment of the present utility model can obtain amplified laser light with a wavelength of 1550nm and a power of 50W by using the two first pump sources 26 with a wavelength of 940nm and a power of 130W, and the amplification efficiency is high.

According to the technical scheme provided by the embodiment of the utility model, the optical fiber laser comprises: a seed light source; the optical fiber amplifier comprises a first inclined grating, a first cladding light stripper, a first active optical fiber, a second inclined grating, a beam combiner, at least one first pumping source and a first transmission optical fiber; the first inclined grating comprises a first input end and a first output end, and the first input end is connected with the seed light source through a first transmission optical fiber; the first cladding light stripper comprises a second input end and a second output end, and the second input end is connected with the first output end through a first transmission optical fiber; the first active optical fiber comprises a third input end and a third output end, and the third input end is connected with the second output end through a first transmission optical fiber; the second inclined grating comprises a fourth input end and a fourth output end, and the fourth input end is connected with the third output end through a first transmission optical fiber; the beam combiner comprises a fifth input end and a fifth output end, wherein the fifth input end is connected with the fourth output end through a first transmission optical fiber, the fifth output end is connected with the first pumping source through the first transmission optical fiber, and the fifth output end outputs amplified laser. The optical fiber laser utilizes the first inclined grating, the first cladding light stripper and the second inclined grating to filter ASE and unutilized pump light so as to ensure the quality of laser light output by a fiber core, effectively reduce the output amplified spontaneous emission light power, help to improve the gain and the signal-to-noise ratio of an optical fiber amplifier and realize high-gain amplification, and the optical fiber laser can output laser beams with the wavelength of 1550nm and the power of 50W and has the advantages of long-term stability, high beam quality, good heat treatment and quasi-fundamental mode output.

Optionally, with continued reference to fig. 1, the first tilted grating 21 has a center wavelength of 1020nm-1055nm and an insertion loss of 0.15dB for the first tilted grating 21; the center wavelength of the second inclined grating 24 is 1020nm-1055nm, and the insertion loss of the second inclined grating 24 is 0.15dB. In addition, the first and second oblique gratings 21 and 24 may be engraved from polarization maintaining optical fiber having a model SM-GDF-1550.

Optionally, with continued reference to fig. 1, the fiber laser further includes an optical isolator 30, where the optical isolator 30 is located between the seed light source 10 and the fiber amplifier 20, and two ends of the optical isolator 30 are connected to the seed light source 10 and the first input end through the first transmission fiber 27, respectively.

Specifically, the fiber laser includes a seed light source 10, a fiber amplifier 20, and an optical isolator 30. The optical isolator 30 is located between the seed light source 10 and the optical fiber amplifier 20, two ends of the optical isolator 30 are respectively connected with the seed light source 10 and the first input end through the first transmission optical fiber 27, the optical isolator 30 can isolate the ASE of 1 μm reversely transmitted along the optical path, the damage or burning of the seed light source 10 caused by the unretrip ASE of 1 μm is avoided, the seed light source 10 is protected, the wavelength of the optical isolator 30 can be 1550nm, the power can be 20W, and the isolation can be 30dB.

Optionally, with continued reference to fig. 1, the fiber laser further includes: an output light adjuster 40, the output light adjuster 40 being connected to the fifth output via a first transmission fiber 27. Further, the output light adjuster 40 includes a third inclined grating 41, a second cladding light stripper 42, and a second transmission optical fiber 43; the third inclined grating 41 includes a sixth input end and a sixth output end, the sixth input end and the fifth output end being connected through the first transmission optical fiber 27; the second cladding light stripper 42 includes a seventh input end and a seventh output end, the seventh input end and the sixth output end are connected through the second transmission optical fiber 43, and the seventh output end outputs the adjusted amplified laser light.

Specifically, the fiber laser includes a seed light source 10, a fiber amplifier 20, and an output light adjuster 40. Wherein the output light adjuster 40 includes a third inclined grating 41, a second cladding light stripper 42, and a second transmission fiber 43. The third inclined grating 41 includes a sixth input end and a sixth output end, the sixth input end is connected with the fifth output end through the first transmission optical fiber 27, and the third inclined grating 41 can reflect the ASE with 1 μm that is partially leaked into the cladding layer, so as to reduce the interference of noise such as the ASE with 1 μm in the output amplified laser. The second cladding light stripper 42 includes a seventh input end and a seventh output end, the seventh input end is connected with the sixth output end through a second transmission optical fiber 43, the second cladding light stripper 42 can strip the ASE of 1 μm reflected by the third inclined grating 41 into the cladding, the second cladding light stripper 42 can strip the pump light (940 nm) which is not utilized in the laser amplifying process, and the seventh output end of the second cladding light stripper 42 can output the amplified laser after the adjustment. Illustratively, the center wavelength of the third slanted grating 41 is 1020nm-1055nm, and the insertion loss of the third slanted grating 41 is 0.15dB.

Fig. 2 is a spectrum diagram of an adjusted amplified laser output by an optical fiber laser according to an embodiment of the present utility model, as shown in fig. 2, in which the adjusted amplified laser output by the seventh output end of the second cladding light stripper 42 has a wavelength of 1550nm, a power of 50W, an efficiency of 42.3%, an edge mode suppression ratio of 63.66dB, a beam quality of 1.08,1 hours stability of 0.43% @ rms, that is, the adjusted amplified laser is a high-performance and quasi-fundamental mode laser beam, and no self-pulse and relaxation oscillation phenomenon is observed in the entire output power range, compared with the amplified laser output by the fifth output end of the beam combiner 25.

Optionally, with continued reference to fig. 1, the seed light source 10 includes a high reflection grating 11, a second pump source 12, a second active optical fiber 13, and low reflection grating 14 and a third transmission optical fiber 15; the second active optical fiber 13 is positioned between the high reflective grating 11 and the low reflective grating 14; the second active optical fiber 13 comprises an eighth input end and an eighth output end, and the eighth input end is respectively connected with the high reflection grating 11 and the second pump source 12 through a third transmission optical fiber 15; the low reflection grating 14 comprises a ninth input end and a ninth output end, and the ninth input end and the eighth output end are connected through a third transmission optical fiber 15; the ninth output is connected to the first input via a first transmission fiber 27.

Specifically, the seed light source 10 comprises a high reflection grating 11, a second pump source 12, a second active optical fiber 13, and a low reflection grating 14 and a third transmission optical fiber 15. The second pump source 12 may generate pump light, the second active optical fiber 13 includes an eighth input end and an eighth output end, the eighth input end is connected to the high reflective grating 11 and the second pump source 12 through a third transmission optical fiber 15, the low reflective grating 14 includes a ninth input end and a ninth output end, the ninth input end is connected to the eighth output end through a third transmission optical fiber 15, that is, the second active optical fiber 13 is located between the high reflective grating 11 and the low reflective grating 14, the second active optical fiber 13, the high reflective grating 11 and the low reflective grating 14 form a resonant cavity with an optical fiber structure, and may receive the pump light, form laser oscillation and output seed laser at the ninth output end of the low reflective grating 14, for example, the high reflective grating 11 and the low reflective grating 14 may be a temperature compensated high and low reflective grating pair, the reflectivity of the high reflective grating 11 may be 99.9%, the bandwidth may be 4nm, the reflectivity of the low reflective grating 14 may be 15%, the bandwidth may be 0.5nm, the wavelength of the output seed laser may be 1550nm, the power may be 6 nm, the quality spectrum may be 12@0.08 nm, and the quality may be 12.20 nm.

It should be noted that, the continuous laser output of the fiber laser according to the embodiment of the present utility model is air-cooled, and the efficiency and heat dissipation requirements of the fiber amplifier 20 are high. The pump light with the wavelength of 940nm and the power of 20W generated by the second pump source 12 can output the amplified laser with the wavelength of 1550nm and the power of 50W after adjustment at the seventh output end of the second cladding light stripper 42, so that the heat and the power consumption of the whole fiber laser are reduced, the whole laser amplifying process has no nonlinear effect, the damage of ASE with the wavelength of 1 μm to the laser is inhibited, and the long-term operation of the fiber laser under the condition of air cooling is ensured.

Optionally, with continued reference to fig. 1, the first active optical fiber 23, the first transmission optical fiber 27, and the second transmission optical fiber 43 are single mode optical fibers; the first active optical fiber 23 is of the type IXF-2CF-EY-O-12-130-L3, the first active optical fiber 23 has a length in the range of 5m-7m, and the first transmission optical fiber 27 is of the type SMF-28E, and the first active optical fiber 23 may have a length of 6m, for example. The first active optical fiber 23 may be a polarization maintaining fiber, the first active optical fiber 23 may be SM-GDF-1550, or the first active optical fiber 23 may be an EY co-doped fiber. In addition, after the adjacent devices in the optical fiber amplifier 20 are connected (welded) by the first transmission optical fiber 27, a low refractive index glue may be further applied to the surface of the first transmission optical fiber 27 to further ensure that the signal light is transmitted in the fiber core, and similarly, a low refractive index glue may also be applied to the surface of the second transmission optical fiber 43.

Optionally, with continued reference to fig. 1, the seed light source 10 further includes a third cladding light stripper 16; the third cladding light stripper 16 is located between the second active optical fiber 13 and the low reflection grating 14, and two ends of the third cladding light stripper 16 are respectively connected with the ninth input ends of the second active optical fiber 13 and the low reflection grating 14 through the third transmission optical fiber 15.

Specifically, the seed light source 10 includes a high reflection grating 11, a second pump source 12, a second active optical fiber 13 and a low reflection grating 14, a third transmission optical fiber 15, and a third cladding light stripper 16. The third cladding light stripper 16 is located between the second active optical fiber 13 and the low reflection grating 14, and two ends of the third cladding light stripper 16 are respectively connected with the ninth input ends of the second active optical fiber 13 and the low reflection grating 14 through a third transmission optical fiber 15.

Optionally, with continued reference to fig. 1, the seed light source 10 further comprises a passive optical fiber 17; the passive optical fiber 17 is located between the high reflection grating 11 and the second active optical fiber 13, and two ends of the passive optical fiber 17 are respectively connected with the high reflection grating 11 and the eighth input end of the second active optical fiber 13 through the third transmission optical fiber 15.

Specifically, the seed light source 10 includes a high reflection grating 11, a second pump source 12, a second active optical fiber 13 and a low reflection grating 14, a third transmission optical fiber 15, and a passive optical fiber 17. The passive optical fiber 17 is located between the high reflection grating 11 and the second active optical fiber 13, two ends of the passive optical fiber 17 are respectively connected with the high reflection grating 11 and an eighth input end of the second active optical fiber 13 through the third transmission optical fiber 15, and the passive optical fiber 17 is helpful to lengthen the cavity length of the resonant cavity of the optical fiber structure, homogenize the longitudinal mode energy and inhibit the relaxation oscillation effect.

Optionally, with continued reference to fig. 1, the second active optical fiber 13 and the third transmission optical fiber 15 are single mode optical fibers; the second active optical fiber 13 is IXF-2CF-EY-O-12-130-L3 in type, the second active optical fiber 13 is 5m-7m in length, and the passive optical fiber 17 is SMF-28E in type. In addition, the second active optical fiber 13 may be a polarization maintaining fiber, the second active optical fiber 13 may be SM-GDF-1550, or the second active optical fiber 13 may be an EY co-doped optical fiber.

Note that the above is only a preferred embodiment of the present utility model and the technical principle applied. It will be understood by those skilled in the art that the present utility model is not limited to the particular embodiments described herein, and that various obvious changes, rearrangements, combinations, and substitutions can be made by those skilled in the art without departing from the scope of the utility model. Therefore, while the utility model has been described in connection with the above embodiments, the utility model is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the utility model, which is set forth in the following claims.

Claims (11)

1. A MOPA structure-based fiber laser, comprising:

a seed light source;

the optical fiber amplifier comprises a first inclined grating, a first cladding light stripper, a first active optical fiber, a second inclined grating, a beam combiner, at least one first pumping source and a first transmission optical fiber;

the first inclined grating comprises a first input end and a first output end, and the first input end is connected with the seed light source through the first transmission optical fiber;

the first cladding light stripper comprises a second input end and a second output end, and the second input end is connected with the first output end through the first transmission optical fiber;

the first active optical fiber comprises a third input end and a third output end, and the third input end is connected with the second output end through the first transmission optical fiber;

the second inclined grating comprises a fourth input end and a fourth output end, and the fourth input end is connected with the third output end through the first transmission optical fiber;

the beam combiner comprises a fifth input end and a fifth output end, wherein the fifth input end is connected with the fourth output end through the first transmission optical fiber, the fifth output end is connected with the first pumping source through the first transmission optical fiber, and the fifth output end outputs amplified laser.

2. The fiber laser of claim 1, wherein the first tilted grating has a center wavelength of 1020nm-1055nm and an insertion loss of 0.15dB;

the center wavelength of the second inclined grating is 1020nm-1055nm, and the insertion loss of the second inclined grating is 0.15dB.

3. The fiber laser of claim 1, further comprising:

the optical isolator is positioned between the seed light source and the optical fiber amplifier, and two ends of the optical isolator are respectively connected with the seed light source and the first input end through the first transmission optical fiber.

4. The fiber laser of claim 1, further comprising:

and the output light regulator is connected with the fifth output end through the first transmission optical fiber.

5. The fiber laser of claim 4, wherein the output light conditioner comprises a third tilted grating, a second cladding light stripper, and a second transmission fiber;

the third inclined grating comprises a sixth input end and a sixth output end, and the sixth input end is connected with the fifth output end through the first transmission optical fiber;

the second cladding light stripper comprises a seventh input end and a seventh output end, the seventh input end is connected with the sixth output end through the second transmission optical fiber, and the seventh output end outputs the amplified laser after adjustment.

6. The fiber laser of claim 1, wherein the seed light source comprises a high reflection grating, a second pump source, a second active fiber, and a low reflection grating and a third transmission fiber;

the second active optical fiber is positioned between the high-reflection grating and the low-reflection grating;

the second active optical fiber comprises an eighth input end and an eighth output end, and the eighth input end is respectively connected with the high-reflection grating and the second pumping source through the third transmission optical fiber;

the low reflection grating comprises a ninth input end and a ninth output end, and the ninth input end is connected with the eighth output end through the third transmission optical fiber; the ninth output end is connected with the first input end through the first transmission optical fiber.

7. The fiber laser of claim 6, wherein the seed light source further comprises a third cladding light stripper;

the third cladding light stripper is positioned between the second active optical fiber and the low reflection grating, and two ends of the third cladding light stripper are respectively connected with the second active optical fiber and the ninth input end of the low reflection grating through the third transmission optical fiber.

8. The fiber laser of claim 6, wherein the seed light source further comprises a passive fiber;

the passive optical fiber is positioned between the high-reflection grating and the second active optical fiber, and two ends of the passive optical fiber are respectively connected with the high-reflection grating and the eighth input end of the second active optical fiber through the third transmission optical fiber.

9. The fiber laser of claim 1, wherein the first active fiber and the first transmission fiber are single mode fibers;

the model of the first active optical fiber is IXF-2CF-EY-O-12-130-L3, and the length of the first active optical fiber ranges from 5m to 7m.

10. The fiber laser of claim 5, wherein the second transmission fiber is a single mode fiber.

11. The fiber laser of claim 6, wherein the second active fiber and the third transmission fiber are single mode fibers;

the model of the second active optical fiber is IXF-2CF-EY-O-12-130-L3, and the length of the second active optical fiber ranges from 5m to 7m.