CN115483601B - Thulium-doped optical fiber amplifier device based on mode control and non-uniform gain ultra-large mode field - Google Patents
Thulium-doped optical fiber amplifier device based on mode control and non-uniform gain ultra-large mode field Download PDFInfo
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- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
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Abstract
Based on mode control and a non-uniform gain ultra-large mode field thulium-doped optical fiber amplifier device, a non-uniform pumping mode is adopted, a second, a third, a fourth, a fifth, a sixth and a seventh multi-mode tail fiber output laser diodes provide sufficient pumping light power for the amplifier, and a second optical fiber beam combiner couples pumping light output by the second, the third, the fourth, the fifth, the sixth and the seventh multi-mode tail fiber output laser diodes and signal light output by an all-fiber oscillator; the front section of highly-doped large-mode-field thulium-doped optical fiber provides enough signal light for the rear section of highly-doped large-mode-field thulium-doped optical fiber, and the rear section of highly-doped large-mode-field thulium-doped optical fiber ensures sufficient pumping absorption and high power generation; the second cladding light filter filters the pump light in the cladding to obtain pure signal light; the end cap with the fiber pigtail reduces the output laser power density at the fiber end face.
Description
Technical Field
The invention relates to the technical field of laser, in particular to a mode control and nonuniform gain based ultra-large mode field thulium-doped optical fiber amplifier device.
Background
In rare earth ion doped lasers, thulium ions can produce laser output near 2 μm. 2 μm laser is in the safe band of human eyes, has excellent performance in the aspects of atmospheric transmission, smoke penetration and the like, and is widely applied to the fields of atmospheric optical communication, remote sensing, laser radar detection and the like; at the same time, it can be absorbed by water molecule and CO 2 Molecule and N 2 O molecules and other molecules are absorbed and applied to different fields of earth (planet) surface water vapor distribution measurement, infrared spectrum analysis, environment detection, laser microsurgery, special material processing and the like.
To meet the needs of these military, medical and industrial fields, designing and developing high performance 2 μm fiber lasers is the most critical step. In a 2-micron optical fiber laser, due to the effect of reabsorption, high seed optical power is required to effectively inhibit amplified spontaneous emission. The amplified spontaneous emission power is a main factor influencing the output power boost. Under the MOPA structure, the amplified spontaneous radiation is accompanied with the whole amplification process, and the spontaneous radiation can be amplified step by the multi-stage amplification structure, so that the improvement of power is limited, the signal-to-noise ratio of a system is reduced, even parasitic oscillation is induced, and the amplifier is burnt. In addition, large mode field fibers can cause increased modes and degraded beam quality. Therefore, it is necessary to take measures to suppress amplified spontaneous emission and to improve beam quality. How to improve output power, signal-to-noise ratio and beam quality and inhibit amplified spontaneous emission is a problem which needs to be solved urgently.
Disclosure of Invention
In order to overcome the defects of the prior art, the technical problem to be solved by the invention is to provide a mode control and nonuniform gain based ultra-large mode field thulium doped optical fiber amplifier device which has a compact structure, simplifies the optical path structure, does not introduce new devices, greatly enhances the stability and the practicability of a laser, does not increase the whole weight of the system while improving the output power, the beam quality and the signal-to-noise ratio, further lightens the volume of the laser, and can be stably and effectively applied to various fields for a long time.
The technical scheme of the invention is as follows: the thulium-doped optical fiber amplifier device based on mode control and non-uniform gain ultra-large mode field comprises: an all-fiber oscillator (10) and a thulium-doped fiber amplifier (20);
the all-fiber oscillator includes: the high-reflectivity optical fiber Bragg grating photonic crystal Fiber (FBG) comprises a first multimode tail fiber output laser diode (11), a high-reflectivity fiber Bragg grating (12), a first optical fiber combiner (13), a high-doping single-mode thulium-doped optical fiber (14), a partial-reflection fiber Bragg grating (15), a first cladding light filter (16) and a first optical fiber isolator (17); the first optical fiber beam combiner couples pump light output by the laser diode output by the first multimode pigtail into the resonant cavity, the high-reflection fiber Bragg grating and the part of reflection fiber Bragg grating are used as two cavity mirrors of the resonant cavity, and the high-doping single-mode thulium-doped optical fiber is used as a gain medium and absorbs the pump light output by the laser diode output by the first multimode pigtail to generate signal light; the laser generated by the resonant cavity obtains pure signal light through the first cladding light filter, and the feedback light is prevented from being influenced by the protection of the all-fiber oscillator through the first fiber isolator;
the thulium-doped optical fiber amplifier includes: the multimode pigtail laser comprises a second multimode pigtail output laser diode (201), a third multimode pigtail output laser diode (202), a fourth multimode pigtail output laser diode (203), a fifth multimode pigtail output laser diode (204), a sixth multimode pigtail output laser diode (205), a seventh multimode pigtail output laser diode (206), a second optical fiber combiner (207), a highly-doped large-mode-field thulium-doped optical fiber with gradually-changed gain coefficient, a second cladding optical filter (211) and an end cap (212) with an optical fiber pigtail; the second optical fiber combiner couples the pump light output by the second, third, fourth, fifth, sixth and seventh multimode tail fiber output laser diodes and the signal light output by the all-fiber oscillator; the front section of highly-doped large-mode-field thulium-doped optical fiber provides enough signal light for the rear section of highly-doped large-mode-field thulium-doped optical fiber, and the rear section of highly-doped large-mode-field thulium-doped optical fiber ensures sufficient pumping absorption and high power generation; the second cladding light filter filters the pump light in the cladding to obtain pure signal light; the end cap with the fiber pigtail reduces the output laser power density at the fiber end face.
The invention provides a non-uniform pumping mode.A second, a third, a fourth, a fifth, a sixth and a seventh multi-mode tail fiber output laser diode provide sufficient pumping light power for an amplifier, and a second optical fiber beam combiner couples pumping light output by the second, the third, the fourth, the fifth, the sixth and the seventh multi-mode tail fiber output laser diodes and signal light output by an all-fiber oscillator; the front section highly-doped large-mode-field thulium-doped optical fiber provides enough signal light for the rear section highly-doped large-mode-field thulium-doped optical fiber, and the rear section highly-doped large-mode-field thulium-doped optical fiber ensures sufficient pumping absorption and generates high power; the second cladding light filter filters the pump light in the cladding to obtain pure signal light; the end cap with the optical fiber tail fiber reduces the output laser power density of the end face of the optical fiber; the structure is compact, the light path structure is simplified, no new device is introduced, the stability and the practicability of the laser are greatly enhanced, the whole weight of the system is not increased while the output power, the beam quality and the signal-to-noise ratio are improved, the size of the laser is further reduced, and the laser can be stably and effectively applied to various fields for a long time.
Drawings
Fig. 1 is a schematic structural diagram of an ultra-large mode field thulium doped optical fiber amplifier device based on mode control and non-uniform gain according to the present invention.
Fig. 2 is a schematic structural diagram of the all-fiber oscillator in fig. 1.
Fig. 3 is a schematic structural diagram of the thulium-doped fiber amplifier in fig. 1.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, shall fall within the protection scope of the present invention.
It should be noted that the term "comprises/comprising" and any variations thereof in the description and claims of the present invention and the above-described drawings is intended to cover non-exclusive inclusions, such that a process, method, apparatus, 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.
As shown in fig. 1-3, the mode control and inhomogeneous gain ultra-large mode field thulium doped fiber amplifier device comprises: an all-fiber oscillator 10, a thulium-doped fiber amplifier 20;
the all-fiber oscillator includes: the optical fiber laser device comprises a first multimode tail fiber output laser diode 11, a highly reflective fiber Bragg grating 12, a first optical fiber beam combiner 13, a highly doped single-mode thulium-doped optical fiber 14, a partially reflective fiber Bragg grating 15, a first cladding optical filter 16 and a first optical fiber isolator 17; the first optical fiber beam combiner couples pump light output by the laser diode output by the first multimode tail fiber into the resonant cavity, the high reflection fiber Bragg grating and the partial reflection fiber Bragg grating are used as two cavity mirrors of the resonant cavity, the high-doped single-mode thulium-doped optical fiber is used as a gain medium, and the pump light output by the laser diode output by the first multimode tail fiber is absorbed to generate signal light; the laser generated by the resonant cavity obtains pure signal light through the first cladding light filter, and the feedback light is prevented from being influenced by the protection of the all-fiber oscillator through the first fiber isolator;
the thulium-doped optical fiber amplifier includes: a second multimode pigtail output laser diode 201, a third multimode pigtail output laser diode 202, a fourth multimode pigtail output laser diode 203, a fifth multimode pigtail output laser diode 204, a sixth multimode pigtail output laser diode 205, a seventh multimode pigtail output laser diode 206, a second optical fiber combiner 207, a highly-doped large-mode-field thulium-doped optical fiber with gradually-changed gain coefficient, a second cladding optical filter 211, and an end cap 212 with an optical fiber pigtail; the second optical fiber combiner couples the pump light output by the second, third, fourth, fifth, sixth and seventh multimode tail fiber output laser diodes and the signal light output by the all-fiber oscillator; the front section of highly-doped large-mode-field thulium-doped optical fiber provides enough signal light for the rear section of highly-doped large-mode-field thulium-doped optical fiber, and the rear section of highly-doped large-mode-field thulium-doped optical fiber ensures sufficient pumping absorption and high power generation; the second cladding light filter filters the pump light in the cladding to obtain pure signal light; the end cap with the fiber pigtail reduces the output laser power density at the fiber end face.
The invention provides a non-uniform pumping mode.A second, a third, a fourth, a fifth, a sixth and a seventh multi-mode tail fiber output laser diode provide sufficient pumping light power for an amplifier, and a second optical fiber beam combiner couples pumping light output by the second, the third, the fourth, the fifth, the sixth and the seventh multi-mode tail fiber output laser diodes and signal light output by an all-fiber oscillator; the front section highly-doped large-mode-field thulium-doped optical fiber provides enough signal light for the rear section highly-doped large-mode-field thulium-doped optical fiber, and the rear section highly-doped large-mode-field thulium-doped optical fiber ensures sufficient pumping absorption and generates high power; the second cladding light filter filters the pump light in the cladding to obtain pure signal light; the end cap with the optical fiber tail fiber reduces the output laser power density of the end face of the optical fiber; the structure is compact, the light path structure is simplified, no new device is introduced, the stability and the practicability of the laser are greatly enhanced, the whole weight of the system is not increased while the output power, the beam quality and the signal-to-noise ratio are improved, the size of the laser is further reduced, and the laser can be stably and effectively applied to various fields for a long time.
Preferably, the highly doped large mode field thulium doped optical fiber comprises: the optical fiber comprises a first high-doping large-mode-field thulium-doped optical fiber 208, a second high-doping large-mode-field thulium-doped optical fiber 209 and a third high-doping large-mode-field thulium-doped optical fiber 210 which have different gain coefficients.
Preferably, the first, second and third highly doped large mode field thulium doped fibers are gain fibers with different doping concentrations and different lengths, and are polarization maintaining fibers, non-polarization maintaining fibers, ultra-large mode field fibers or single mode fibers.
Preferably, the highly doped large mode field thulium-doped optical fiber is an optical fiber with different gain coefficient distributions, the concentration of doped rare earth ions of the optical fiber is gradually changed, the gain absorption generated by the distribution is different, the concentration of the doped rare earth ions at the input end of the pump is low, the thermal effect is effectively reduced, and the amplification of the optical fiber is ensured; the concentration of rare earth ions doped in the middle position of the optical fiber is high, and effective gain extraction is carried out; the rare earth ions doped at the output end of the optical fiber have low concentration, and the residual pump light is absorbed, so that gain controllable amplification is realized. Because the pump light at the input end is too strong, the amplified signal light at the output end is too strong, and the optical fiber is easily damaged due to the fact that the light is too strong and the power is too high, the rare earth ion doped concentration at the input end and the output end is low.
Preferably, the highly-doped large-mode-field thulium-doped optical fiber is an ultra-large-mode-field fiber core gradient optical fiber, and the diameter of the fiber core is 30-80 mu m; and tapering at the output end of the ultra-large mode field optical fiber to reduce the diameter of the fiber core.
Preferably, the highly doped large mode field thulium doped fiber is a variable core diameter gain fiber, and includes: single-taper optical fibers, spindle-shaped optical fibers, and saddle-shaped optical fibers; the variable core diameter gain fiber has a core diameter that varies along the length of the fiber.
Preferably, the highly doped single-mode thulium-doped fiber is a polarization-maintaining fiber, a non-polarization-maintaining fiber, a large-mode-field fiber or a single-mode fiber with different doping concentrations.
Preferably, the all-fiber oscillator is a single-mode polarization-maintaining all-fiber oscillator, a single-mode non-polarization-maintaining all-fiber oscillator, a large-mode-field polarization-maintaining all-fiber oscillator, or a large-mode-field non-polarization-maintaining all-fiber oscillator; the thulium-doped optical fiber amplifier is a single-mode polarization-maintaining thulium-doped optical fiber amplifier, a single-mode non-polarization-maintaining thulium-doped optical fiber amplifier, a large-mode-field polarization-maintaining thulium-doped optical fiber amplifier or a large-mode-field non-polarization-maintaining thulium-doped optical fiber amplifier; the applicable wave band range of the all-fiber oscillator and the thulium-doped fiber amplifier is 1.9 mu m-2.1 mu m.
Preferably, the pigtail of the end cap with the optical fiber pigtail is a polarization maintaining fiber, a non-polarization maintaining fiber, an ultra-large mode field fiber or a single mode fiber.
The specific working process of the device of the invention is as follows:
the first optical fiber combiner 13 couples the pump light output by the first multimode pigtail output laser diode 11 into the resonant cavity, the highly reflective fiber bragg grating 12 and the partially reflective fiber bragg grating 15 serve as two cavity mirrors of the resonant cavity, and the highly doped single-mode thulium-doped optical fiber 14 serves as a gain medium, absorbs the pump light output by the first multimode pigtail output laser diode 11, and generates signal light. The laser generated by the resonant cavity passes through the first cladding light filter 16 to obtain pure signal light, and passes through the first optical fiber isolator 17 to protect the all-optical fiber oscillator and prevent the feedback light from influencing.
The second optical fiber combiner 207 couples the pump light output by the second multimode pigtail output laser diode 201, the third multimode pigtail output laser diode 202, the fourth multimode pigtail output laser diode 203, the fifth multimode pigtail output laser diode 204, the sixth multimode pigtail output laser diode 205 and the seventh multimode pigtail output laser diode 206 with the signal light output by the all-fiber oscillator 10, and the output optical power enters the first highly-doped thulium-doped large mode field optical fiber 208, the second highly-doped large mode field optical fiber 209 and the third highly-doped large mode field optical fiber 210 to generate high-power laser. The first highly doped high mode field thulium doped fiber 208 is used for generating enough signal light for the second highly doped high mode field thulium doped fiber 209 and the third highly doped high mode field thulium doped fiber 210; the second highly doped high mode field thulium doped fiber 209 and the third highly doped high mode field thulium doped fiber 210 are used to ensure sufficient pump absorption and generate high power. The concentration of rare earth ions doped at the input end of the pump is low, so that the thermal effect is effectively reduced, and the optical fiber amplification is ensured; the concentration of rare earth ions doped in the middle position of the optical fiber is high, and effective gain extraction is carried out; the rare earth ions doped at the output end of the optical fiber have low concentration, and the residual pump light is absorbed, so that gain controllable amplification is realized. Meanwhile, the absorption coefficient of the ultra-large mode field optical fiber pump is high, so that efficient gain extraction can be guaranteed, the amplification efficiency of the laser is effectively improved, and the power density of the end face of the optical fiber is reduced, so that the output power is improved by one order of magnitude on the original basis, and the long-term effective operation of the laser is guaranteed. Tapering is carried out at the output end of the ultra-large mode field optical fiber, the diameter of the fiber core is reduced, high power output is effectively realized, high beam quality is guaranteed, and quasi-single mode laser output is realized. The third highly-doped large-mode-field thulium-doped optical fiber 210 is connected with the second cladding optical filter 211, so that the pump light in the cladding is filtered, the end cap 212 with the optical fiber pigtail is welded after pure signal light is obtained, the optical power density in the optical fiber is reduced, and long-time operation is effectively realized.
The invention has the following beneficial technical effects:
1. the invention provides a non-uniform pumping mode, which is composed of a plurality of sections of optical fibers with different gain coefficients, wherein the first section of optical fiber provides enough signal light for the second section of optical fiber, the third section of optical fiber and the like, and the second section of optical fiber and the third section of optical fiber ensure enough pumping absorption and generate high power. One is an optical fiber with different gain coefficient distributions, the concentration of doped rare earth ions of the optical fiber is gradually changed, the gain absorption generated by the distribution is different, the concentration of the doped rare earth ions at the input end of a pump is lower, the thermal effect is effectively reduced, and the amplification of the optical fiber is ensured; the concentration of rare earth ions doped in the middle position of the optical fiber is high, and effective gain extraction is carried out; the rare earth ions doped at the output end of the optical fiber have low concentration, and the residual pump light is absorbed, so that gain controllable amplification is realized. The technical route has a compact structure, simplifies a light path structure, does not introduce new devices, greatly enhances the stability and the practicability of the laser, does not increase the whole weight of a system while improving the output power, the beam quality and the signal-to-noise ratio, further lightens the volume of the laser, and can be stably and effectively applied to various fields for a long time.
2. The technical route of the invention adopts an ultra-large mode field fiber core gradient optical fiber, and the diameter of the fiber core is between 30 mu m and 80 mu m. The optical fiber pump has high absorption coefficient, can ensure efficient gain extraction, effectively improves the amplification efficiency of the laser, and reduces the power density of the optical fiber end face, thereby realizing that the output power is improved by one order of magnitude on the original basis, and ensuring the long-term effective operation of the laser. Tapering is carried out at the output end of the ultra-large mode field optical fiber, the diameter of the fiber core is reduced, high power output is effectively realized, high beam quality is guaranteed, and quasi-single mode laser output is realized. Meanwhile, the device adopts a non-uniform gain mode to effectively solve the problem of heat distribution in the optical fiber, and the highly doped optical fiber is used for realizing efficient gain extraction, absorbing more pumps and reducing heat accumulation; the low-doped optical fiber is welded at the output end, so that heat accumulation at the output end is relieved, the output end face is protected, and the normal operation of the laser is ensured.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modifications, equivalent variations and modifications made on the above embodiment according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.
Claims (8)
1. Based on mode control and inhomogeneous gain super large mode field thulium-doped fiber amplifier device, its characterized in that: it comprises the following steps: an all-fiber oscillator (10) and a thulium-doped fiber amplifier (20);
the all-fiber oscillator includes: the optical fiber coupling device comprises a first multimode pigtail output laser diode (11), a high-reflectivity fiber Bragg grating (12), a first optical fiber combiner (13), a high-doping single-mode thulium-doped optical fiber (14), a partially-reflective optical fiber Bragg grating (15), a first cladding optical filter (16) and a first optical fiber isolator (17); the first optical fiber beam combiner couples pump light output by the laser diode output by the first multimode pigtail into the resonant cavity, the high-reflection fiber Bragg grating and the part of reflection fiber Bragg grating are used as two cavity mirrors of the resonant cavity, and the high-doping single-mode thulium-doped optical fiber is used as a gain medium and absorbs the pump light output by the laser diode output by the first multimode pigtail to generate signal light; the laser generated by the resonant cavity obtains pure signal light through the first cladding light filter, and the feedback light is prevented from being influenced by the protection of the all-fiber oscillator through the first fiber isolator;
the thulium-doped optical fiber amplifier includes: the multimode pigtail laser comprises a second multimode pigtail output laser diode (201), a third multimode pigtail output laser diode (202), a fourth multimode pigtail output laser diode (203), a fifth multimode pigtail output laser diode (204), a sixth multimode pigtail output laser diode (205), a seventh multimode pigtail output laser diode (206), a second optical fiber combiner (207), a highly-doped large-mode-field thulium-doped optical fiber with gradually-changed gain coefficient, a second cladding optical filter (211) and an end cap (212) with an optical fiber pigtail; the second optical fiber beam combiner couples the pump light output by the second, third, fourth, fifth, sixth and seventh multimode tail fiber output laser diodes and the signal light output by the all-fiber oscillator; the front section of highly-doped large-mode-field thulium-doped optical fiber provides enough signal light for the rear section of highly-doped large-mode-field thulium-doped optical fiber, and the rear section of highly-doped large-mode-field thulium-doped optical fiber ensures sufficient pumping absorption and high power generation; the second cladding light filter filters the pump light in the cladding to obtain pure signal light; the end cap with the fiber pigtail reduces the output laser power density at the fiber end face.
2. The mode-control-and-non-uniform-gain-based ultra-large mode field thulium-doped fiber amplifier device according to claim 1, wherein: the highly doped large mode field thulium doped optical fiber comprises: the high-gain optical fiber comprises a first high-doping large-mode-field thulium-doped optical fiber (208), a second high-doping large-mode-field thulium-doped optical fiber (209) and a third high-doping large-mode-field thulium-doped optical fiber (210), which have different gain coefficients.
3. The mode-control-and-non-uniform-gain-based ultra-large-mode-field thulium-doped fiber amplifier device according to claim 2, wherein: the first, second and third highly doped large mode field thulium doped fibers are gain fibers with different doping concentrations and different lengths, and are single mode fibers.
4. The mode-control-and-non-uniform-gain-based ultra-large mode field thulium-doped fiber amplifier device according to claim 1, wherein: the highly doped large-mode-field thulium-doped optical fiber is an optical fiber with different gain coefficient distributions, the concentration of doped rare earth ions of the optical fiber is gradually changed, the gain absorption generated by the distribution is different, the concentration of the doped rare earth ions at the input end of the pump is lower, the thermal effect is effectively reduced, and the amplification of the optical fiber is ensured; the concentration of doped rare earth ions at the middle position of the optical fiber is high, and effective gain extraction is carried out; the rare earth ions doped at the output end of the optical fiber have low concentration, and the residual pump light is absorbed, so that gain controllable amplification is realized.
5. The mode-control-and-non-uniform-gain-based ultra-large mode field thulium-doped fiber amplifier device according to claim 1, wherein: the highly-doped large-mode-field thulium-doped optical fiber is an ultra-large-mode-field fiber core gradient optical fiber, and the diameter of the fiber core is between 30 mu m and 80 mu m; and tapering at the output end of the ultra-large mode field optical fiber to reduce the diameter of the fiber core.
6. The mode-control-and-non-uniform-gain-based ultra-large mode field thulium-doped fiber amplifier device according to claim 1, wherein: highly dope big mode field thulium-doped optical fiber for becoming core footpath diameter gain optical fiber, include: single-taper optical fibers, spindle-shaped optical fibers, and saddle-shaped optical fibers; the variable core diameter gain fiber has a core diameter that varies along the length of the fiber.
7. The thulium doped fiber amplifier device based on mode control and non-uniform gain ultra-large mode field according to claim 1, wherein: the highly doped single-mode thulium-doped optical fiber is a single-mode optical fiber with different doping concentrations.
8. The mode-control-and-non-uniform-gain-based ultra-large mode field thulium-doped fiber amplifier device according to claim 1, wherein: the tail fiber of the end cap with the optical fiber tail fiber is a single-mode optical fiber.
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| CN115483601B true CN115483601B (en) | 2023-04-04 |
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| CN202211331101.8A Active CN115483601B (en) | 2022-10-28 | 2022-10-28 | Thulium-doped optical fiber amplifier device based on mode control and non-uniform gain ultra-large mode field |
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| JP3344475B2 (en) * | 1999-03-19 | 2002-11-11 | 日本電気株式会社 | Laser oscillator and laser amplifier |
| US6721092B2 (en) * | 2001-02-21 | 2004-04-13 | Nippon Telegraph And Telephone Corporation | Thulium-doped fiber amplifier using pump light for improving conversion efficiency in S-band |
| CN101340053A (en) * | 2008-08-13 | 2009-01-07 | 中国科学院上海光学精密机械研究所 | Intermediate infrared thulium-doped optical fiber laser amplifier |
| CN102299475B (en) * | 2011-07-21 | 2012-08-08 | 西北大学 | Narrow-linewidth single-transverse mode hundred watt level 2 micron thulium doped fiber laser with all-fiber structure |
| CN103078243B (en) * | 2013-01-30 | 2016-05-04 | 上海交通大学 | Mix 2 microns of high pulse energy thulium-doped fiber lasers of pumping |
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