CN115395354A - High-efficiency 4-micron cascaded optical fiber amplifier based on dual-wavelength pumping - Google Patents
High-efficiency 4-micron cascaded optical fiber amplifier based on dual-wavelength pumping Download PDFInfo
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 42
- 239000000835 fiber Substances 0.000 claims abstract description 57
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- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 claims description 3
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- 229910052761 rare earth metal Inorganic materials 0.000 description 3
- 150000002910 rare earth metals Chemical class 0.000 description 3
- 229910004261 CaF 2 Inorganic materials 0.000 description 2
- 239000005387 chalcogenide glass Substances 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06754—Fibre amplifiers
- H01S3/06758—Tandem amplifiers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- H01S3/06716—Fibre compositions or doping with active elements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/094096—Multi-wavelength pumping
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Abstract
The invention provides a high-efficiency 4 mu m cascade fiber amplifier based on dual-wavelength pumping, which can effectively solve Dy in gain fiber 3+ The self-termination phenomenon of 4 μm laser transition process which is easy to occur in ions can be avoided, the technical bottleneck of the shortage of the wave band fiber grating above 4 μm can be avoided, and the high-efficiency and stable 4.3 μm fiber laser light source can be obtained. The optical fiber amplifier adopts a pump laser with tunable 2.4 mu m wave band, and realizes more efficient excited state absorption and obtains optimal pumping efficiency by tuning the pumping wavelength within a certain range; meanwhile, a laser signal source with tunable double seed wavelengths is adopted to obtain wide-tuning dual-band cascade laser amplification of 4.3 mu m wave band and 3.0 mu m wave band. The invention can improve the conversion efficiency of amplifying the laser output of the optical fiber by continuously optimizing the wavelength of the double-seed light, and avoids the rare intermediate infrared unit optical fibers such as intermediate infrared fiber gratings and the like by adopting the optical fiber amplifier structure of the intermediate infrared bandUse of a device.
Description
Technical Field
The invention relates to the field of mid-infrared fiber lasers, in particular to a high-efficiency 4-micrometer cascade fiber amplifier based on dual-wavelength pumping.
Background
As is known, the mid-infrared band of 3-5 μm has special spectral characteristics, and is located in one of the atmospheric transparent window bands and is also located in CH 4 、NH 3 、CO 2 And important molecular fingerprint areas such as CO, the laser light source in the waveband can be widely applied to various fields such as satellite-ground communication, spectral imaging, laser surgery, gas monitoring and the like.
The main methods for obtaining the laser band light source at present are an Optical Parametric Oscillator (OPO), a Quantum Cascade Laser (QCL), a mid-infrared fiber laser and the like. In contrast, the mid-infrared fiber laser has the advantages of good beam quality, high electro-optical efficiency, compact and stable structure, and the like, and is one of the most potential mid-infrared laser technologies in the future. In recent years, due to the rapid development of mid-infrared optical fiber devices such as low-loss rare earth doped gain optical fibers, optical fiber gratings, end caps and the like, the development of mid-infrared optical fiber lasers has been greatly advanced. At present, the maximum continuous output power of the publicly reported 3 μm waveband fiber laser already breaks through 40W, and the longest lasing wavelength at normal temperature is 3.92 μm. However, so far, limited by the shortage of high-performance mid-infrared gain optical fiber materials with the gain of more than 4 μm and related devices, the industry has not published reports of optical fiber laser output with the gain of more than 4 μm based on rare earth doped optical fiber. Therefore, how to develop the infrared fiber laser light source in the band above 4 μm becomes one of the hot spots for research and thinking of researchers.
Recently, rare earth dysprosium ion (Dy) 3+ ) The doped chalcogenide glass optical fiber has the advantages of low maximum phonon energy, strong fluorescence emission of more than 4 mu m, large low-loss infrared transmission window (0.9-6.0 mu m) and the like, and becomes one of excellent candidate gain optical fiber materials for developing an infrared optical fiber laser light source in a wave band of more than 4 mu m. But because Dy in chalcogenide glass optical fiber 3+ Ion 4 μm laser upper energy level 6 H 11/2 The lifetime (-2 ms) is much shorter than the lower energy level 6 H 13/2 Lifetime (-6 ms), resulting in this band of laser lightThe self-termination phenomenon is easy to occur in the oscillation process, and the output of the laser with the diameter of more than 4 mu m is greatly blocked. At present, the development of the fiber grating device with the wave band of more than 4 μm is not mature, which further limits the further development of the fiber laser light source with the wave band. Therefore, development of a Dy-suppressed compound 3+ The novel optical fiber amplification technology of the self-termination process in the ion laser transition process is very important for realizing the breakthrough of an infrared optical fiber laser light source in a wave band of more than 4 mu m.
Disclosure of Invention
The invention provides a high-efficiency 4 mu m cascade fiber amplifier based on dual-wavelength pumping, which can effectively solve Dy in gain fiber 3+ The self-termination phenomenon of 4 μm laser transition process which is easy to occur in ions can be avoided, the technical bottleneck of the shortage of the wave band fiber grating above 4 μm can be avoided, and the high-efficiency and stable 4.3 μm fiber laser light source can be obtained.
In order to achieve the purpose, the invention adopts the technical scheme that:
a high-efficiency 4 mu m cascade fiber amplifier based on dual-wavelength pumping is characterized in that: the laser gain control system comprises a first laser pumping source, a second laser pumping source, a first pumping beam combiner, a first laser signal source, a second laser signal source, a signal beam combiner, a first wavelength division multiplexer, a gain optical fiber, a second wavelength division multiplexer, a third laser pumping source, a fourth laser pumping source, a second pumping beam combiner and an optical fiber end cap;
the first laser signal source is in fusion welding with a port c of a beam splitting end of the signal beam combiner, and the second laser signal source is in fusion welding with a port d of the beam splitting end of the signal beam combiner; the beam combining end of the signal beam combiner is welded with the pumping injection end of the first wavelength division multiplexer;
the first laser pump source is welded with the beam splitting end a of the first pump beam combiner, and the second laser pump source is welded with the beam splitting end b of the first pump beam combiner; the beam combining end of the first pump beam combiner is welded with the signal injection end of the first wavelength division multiplexer;
the third laser pumping source is welded with the beam splitting end e of the second pumping beam combiner; the fourth laser pumping source is welded with the beam splitting end f of the second pumping beam combiner; the beam combining end of the second pump beam combiner is welded with the pump injection end of the second wavelength division multiplexer;
the optical fiber laser comprises a first wavelength division multiplexer, a second wavelength division multiplexer, an optical fiber end cap and a power supply, wherein the beam combining end of the first wavelength division multiplexer is welded with one end of a gain optical fiber, the other end of the gain optical fiber is welded with the beam combining end of the second wavelength division multiplexer, the signal output end of the second wavelength division multiplexer is welded with the optical fiber end cap, and the optical fiber end cap is used for outputting high-power laser.
Further, the first laser signal source adopts a mid-infrared quantum cascade laser, the output wavelength is 4.2-4.4 μm, and the output power is 0-200 mW;
the second laser signal source adopts an Er-doped fluoride fiber laser, the output wavelength is 2.8-3.0 mu m, and the output power is 0-2W.
Furthermore, the first laser pump source and the third laser pump source both adopt Tm-doped quartz fiber lasers, the output wavelength is 1.7 mu m, and the output power is 0-10W;
the second laser pumping source and the fourth laser pumping source both adopt intermediate infrared optical parametric oscillators, the output wavelength is 2.3-2.5 mu m, and the output power is 0-1W.
Furthermore, dy is adopted by the gain optical fiber 3+ The doped GaAsSbS optical fiber has the doping concentration of 3000-5000 ppm and the core cladding size of 9/125 mu m.
Furthermore, the working wave band of the signal beam combiner is 2.8-4.5 μm;
the working wave bands of the first pump beam combiner and the second pump beam combiner are 1.5-2.5 micrometers;
the working wave bands of the first wavelength division multiplexer and the second wavelength division multiplexer are respectively 1.5-2.5 micrometers and 2.8-4.5 micrometers.
Furthermore, the optical fiber end cap adopts CaF plated with a high-permeability film 2 End cap of single crystal with transmittance of 99% @3.0 μm&4.3μm。
Compared with the prior art, the invention has the following beneficial technical effects:
1. the high-efficiency 4-micron cascade fiber amplifier based on the dual-wavelength pumping adopts a fiber amplifier structure of a middle infrared band, and can skillfully avoid the use of rare middle infrared unit fiber devices such as a middle infrared fiber grating and the like.
2. The invention innovatively uses a dual-waveband (1.7 mu m and 2.4 mu m waveband) bidirectional pumping structure, and Dy is absorbed by using the Ground State Absorption (GSA) of pumping laser of the waveband through pumping by adopting 1.7 mu m laser 3+ Ion direct pumping to the upper energy level of 4.3 μm band laser 6 H 11/2 ) Further pumping with 2.4 μm band laser, and using Excited State Absorption (ESA) of the pumping laser in this band, (lower energy level of 4.3 μm laser and lower energy level of 3.0 μm band laser: ( 6 H 13/2 ) Upper population is pumped to a higher upper energy level and then transited to a higher upper energy level through radiationless transition 6 H 11/2 。
3. The invention adopts a double-seed optical cascade amplification structure with 4.3 mu m and 3.0 mu m wave bands, and can effectively evacuate the lower energy level of 4.3 mu m laser through the cascade amplification output of the laser with the 3.0 mu m wave band 6 H 13/2 ) The particle number is increased, and the particle number density reversal between the upper energy level and the lower energy level of 4.3 mu m laser is greatly promoted; through the innovative design of the two aspects, dy caused by that the service life of the upper energy level of 4.3 mu m laser is far shorter than that of the lower energy level can be effectively solved 3+ The difficult problems of inversion and laser self-termination are difficult to realize by the particle number density, and the effective amplification laser output of the laser in the wave band is realized.
4. The invention adopts the 2.4 mu m wave band tunable pump laser, and realizes more efficient excited state absorption by tuning the pump wavelength in a certain range, thereby obtaining the optimal pump efficiency; the laser signal source with tunable double-seed wavelength is skillfully adopted, so that wide-tuning dual-band cascade laser amplification of 4.3 mu m band and 3.0 mu m band can be obtained, and the conversion efficiency of the laser output of the amplification optical fiber can be improved by continuously optimizing the wavelength of the double-seed light.
5. The output structure of the invention is plated with a high-permeability film (T is more than or equal to 99% @3.0 mu m)&4.3 μm) of CaF 2 The single crystal end cap can effectively inhibit the generation of parasitic laser in the amplifier and improve the signal-to-noise ratio and stability of the laser output by the amplifier; the whole amplifier has an all-fiber structure, simple and compact structure and high stabilityGood results are obtained.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of a high-efficiency 4 μm cascaded fiber amplifier based on dual-wavelength pumping according to the present invention;
FIG. 2 is a diagram of the relationship between the tunable laser band and the conversion efficiency and gain obtained by theoretical calculation according to the embodiment of the present invention; wherein, (a) is a relation graph of 4.3 μm wave band and conversion efficiency and gain size; (b) Is a relation graph of a 3.0 mu m wave band and conversion efficiency and gain size;
FIG. 3 is a graph of the conversion efficiency of the output laser in the 4.3 μm band obtained by theoretical calculation according to the embodiment of the present invention;
reference numerals:
1-a first laser pumping source, 2-a second laser pumping source, 3-a first pumping beam combiner, 4-a first laser signal source, 5-a second laser signal source, 6-a signal beam combiner, 7-a first wavelength division multiplexer, 8-a gain fiber, 9-a second wavelength division multiplexer, 10-a third laser pumping source, 11-a fourth laser pumping source, 12-a second pumping beam combiner and 13-a fiber end cap.
Detailed Description
To make the objects, advantages and features of the present invention more apparent, a high efficiency 4 μm cascaded fiber amplifier based on dual wavelength pumping according to the present invention will be described in detail with reference to the accompanying drawings and specific embodiments. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention and are not intended to limit the scope of the present invention. In the description of the present invention, it should be noted that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
As shown in fig. 1, the high-efficiency 4 μm cascaded fiber amplifier based on dual-wavelength pumping provided in this embodiment includes a first laser pumping source 1, a second laser pumping source 2, a first pumping combiner 3, a first laser signal source 4, a second laser signal source 5, a signal combiner 6, a first wavelength division multiplexer 7, a gain fiber 8, a second wavelength division multiplexer 9, a third laser pumping source 10, a fourth laser pumping source 11, a second pumping combiner 12, and a fiber end cap 13.
The first laser signal source 4 is welded with a splitting end c interface of the signal combiner 6, and the second laser signal source 5 is welded with a splitting end d interface of the signal combiner 6; the beam combining end of the signal beam combiner 6 is welded with the pumping injection end of the first wavelength division multiplexer 7. The first laser signal source 4 adopts a mid-infrared quantum cascade laser, the output wavelength is 4.2-4.4 mu m, and the output power is 0-200 mW. The second laser signal source 5 adopts an Er-doped fluoride fiber laser, the output wavelength is 2.8-3.0 μm, and the output power is 0-2W. The working wave band of the signal beam combiner 6 is 2.8-4.5 mu m. Adopts a double-seed optical cascade amplification structure with 4.3 mu m and 3.0 mu m wave bands, and can effectively evacuate the lower energy level of 4.3 mu m laser through the cascade amplification output of 3.0 mu m wave band laser 6 H 13/2 ) The upper particle number greatly promotes the inversion of the particle number density between the upper and lower energy levels of the 4.3 μm laser.
The first laser pump source 1 is welded with the beam splitting end a of the first pump beam combiner 3, and the second laser pump source 2 is welded with the beam splitting end b of the first pump beam combiner 3; the beam combining end of the first pump beam combiner 3 is welded with the signal injection end of the first wavelength division multiplexer 7.
The third laser pump source 10 is welded with the beam splitting end e of the second pump beam combiner 12; the fourth laser pumping source 11 is welded with the beam splitting end f of the second pumping beam combiner 12; the beam combining end of the second pump beam combiner 12 is welded with the pump injection end of the second wavelength division multiplexer 9.
The first laser pump source 1 and the third laser pump source 10 adopt Tm-doped quartz fiber lasers, the output wavelength is 1.7 mu m, and the output power is 0-10W; the second laser pump source 2 and the fourth laser pump source 11 can adopt a mid-infrared optical parametric oscillator, the output wavelength is 2.3-2.5 mu m, and the output power is 0-1W. The working wave bands of the first pump beam combiner 3 and the second pump beam combiner 12 are 1.5-2.5 μm.
The embodiment innovatively uses a two-band (1.7 mu m and 2.4 mu m bands) bidirectional pumping structure, dy is pumped by adopting 1.7 mu m laser, and the Ground State Absorption (GSA) of the pumping laser of the band is utilized 3+ Ion direct pumping to the upper energy level of 4.3 μm band laser 6 H 11/2 ) Further by employing 2Pumping with 4 μm band laser, and using the Excited State Absorption (ESA) of the pumping laser to lower the energy levels of 4.3 μm laser and 3.0 μm laser (lower energy level of the pump laser) 6 H 13/2 ) Upper population is pumped to a higher upper energy level and then transited to a higher upper energy level through radiationless transition 6 H 11/2 。
Simultaneously adopts a two-way pumping structure with two wave bands (1.7 mu m wave bands and 2.4 mu m wave bands) and a double-seed optical cascade amplification structure with 4.3 mu m wave bands and 3.0 mu m wave bands, and can effectively solve Dy caused by the fact that the service life of the upper energy level of 4.3 mu m laser is far shorter than that of the lower energy level 3+ The difficult problems of inversion and laser self-termination are difficult to realize by the particle number density, and the effective amplification laser output of the laser in the wave band is realized.
The end of closing the beam of first wavelength division multiplexer 7 and the butt fusion of gain fiber 8, the other end of gain fiber 8 and the end butt fusion of closing the beam of second wavelength division multiplexer 9, and the signal output part of second wavelength division multiplexer 9 and the butt fusion of optic fibre end cap 13.
The working wave bands of the first wavelength division multiplexer 7 and the second wavelength division multiplexer 9 are respectively 1.5-2.5 μm and 2.8-4.5 μm. Dy is adopted as the gain fiber 8 3+ The doped GaAsSbS optical fiber has the doping concentration of 3000-5000 ppm and the core cladding size of 9/125 mu m.
The optical fiber end cap 13 is coated with a high-permeability film (transmittance is more than or equal to 99% @3.0 μm)&4.3 μm) of CaF 2 The single crystal end cap can effectively inhibit the generation of parasitic laser in the amplifier and improve the signal-to-noise ratio and stability of the laser output by the amplifier. The whole amplifier is of an all-fiber structure, and can obtain stable, high-efficiency and high-gain dual-band cascade laser amplification output with 4.3 mu m wave band and 3.0 mu m wave band.
In this embodiment, the first pump beam combiner 3 and the second pump beam combiner 12 are used to combine two beams of pump light with different wavelengths (1.7 μm and 2.4 μm) into one beam, and then the pump injection ends of the first wavelength division multiplexer 7 and the second wavelength division multiplexer 9 are combined to inject Dy 3+ A bidirectional pumping light in the front and back direction is formed in the doped gain fiber 8; simultaneously, two signal lasers (3.0 and 4.3 mu m) are combined by a signal beam combiner 6 and Dy is injected into a signal injection end of a wavelength division multiplexer 7 3+ In the doped gain fiber 8, a two-stage communication is formedSeed light, and further realize the two-waveband cascade laser amplification of 4.3 mu m waveband and 3.0 mu m waveband, and output high-power amplified fiber laser through the fiber end cap 13.
By theoretical calculation, the wide-tuning high-efficiency amplified laser output is obtained by adjusting the band range of the seed laser, as shown in fig. 2 (a) and fig. 2 (b), which respectively show the conversion efficiency and gain value of the output amplified laser of each band obtained under different 4.3 μm and 3.0 μm band conditions.
As shown in fig. 3, under the conditions that the wavelength of the signal seed light is 4.34 μm and 3.0 μm (the length of the gain fiber is set to 0.5m, the fiber loss is set to 1dB/m, and the injection power of the signal light is 100 mw), the laser output power amplified in the 4.3 μm band varies with the pump light power, and the laser conversion efficiency reaches 33%.
The invention skillfully adopts the 2.4 mu m wave band tunable pump laser, realizes more efficient excited state absorption by tuning the pump wavelength in a certain range, and further obtains the optimal pump efficiency; the laser signal source with tunable double-seed wavelength is skillfully adopted, so that wide-tuning dual-band cascade laser amplification of 4.3 mu m band and 3.0 mu m band can be obtained, and the conversion efficiency of the laser output of the amplification optical fiber can be improved by continuously optimizing the wavelength of the double-seed light. The structure of the optical fiber amplifier in the middle infrared band is adopted, so that the use of rare middle infrared unit optical fiber devices such as middle infrared optical fiber gratings and the like can be avoided skillfully.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the present invention.
Claims (6)
1. A high-efficiency 4 mu m cascade fiber amplifier based on dual-wavelength pumping is characterized in that: the device comprises a first laser pumping source (1), a second laser pumping source (2), a first pumping beam combiner (3), a first laser signal source (4), a second laser signal source (5), a signal beam combiner (6), a first wavelength division multiplexer (7), a gain optical fiber (8), a second wavelength division multiplexer (9), a third laser pumping source (10), a fourth laser pumping source (11), a second pumping beam combiner (12) and an optical fiber end cap (13);
the first laser signal source (4) is in interface fusion with a beam splitting end c of the signal combiner (6), and the second laser signal source (5) is in interface fusion with a beam splitting end d of the signal combiner (6); the beam combining end of the signal beam combiner (6) is welded with the pumping injection end of the first wavelength division multiplexer (7);
the first laser pump source (1) is welded with the beam splitting end a of the first pump beam combiner (3), and the second laser pump source (2) is welded with the beam splitting end b of the first pump beam combiner (3); the beam combining end of the first pump beam combiner (3) is welded with the signal injection end of the first wavelength division multiplexer (7);
the third laser pump source (10) is welded with the beam splitting end e of the second pump beam combiner (12); the fourth laser pumping source (11) is welded with the beam splitting end f of the second pumping beam combiner (12); the beam combining end of the second pump beam combiner (12) is welded with the pump injection end of the second wavelength division multiplexer (9);
the end of restrainting of closing of first wavelength division multiplexer (7) and the one end butt fusion of gain optic fibre (8), the other end of gain optic fibre (8) and the end butt fusion of restrainting of closing of second wavelength division multiplexer (9), second wavelength division multiplexer (9) signal output part and optic fibre end cap (13) butt fusion, optic fibre end cap (13) are used for exporting high power laser.
2. The dual wavelength pump based high efficiency 4 μm cascaded fiber amplifier of claim 1, wherein:
the first laser signal source (4) adopts a mid-infrared quantum cascade laser, the output wavelength is 4.2-4.4 mu m, and the output power is 0-200 mW;
the second laser signal source (5) adopts an Er-doped fluoride fiber laser, the output wavelength is 2.8-3.0 mu m, and the output power is 0-2W.
3. The dual wavelength pump based high efficiency 4 μm cascaded fiber amplifier of claim 2, wherein:
the first laser pump source (1) and the third laser pump source (10) both adopt Tm-doped quartz fiber lasers, the output wavelength is 1.7 mu m, and the output power is 0-10W;
the second laser pump source (2) and the fourth laser pump source (11) both adopt intermediate infrared optical parametric oscillators, the output wavelength is 2.3-2.5 mu m, and the output power is 0-1W.
4. The dual wavelength pump based high efficiency 4 μm cascaded fiber amplifier of claim 3, wherein:
the gain optical fiber (8) adopts Dy 3+ The doped GaAsSbS optical fiber has the doping concentration of 3000-5000 ppm and the core cladding size of 9/125 mu m.
5. The dual wavelength pump based high efficiency 4 μm cascaded fiber amplifier of claim 4, wherein:
the working wave band of the signal beam combiner (6) is 2.8-4.5 mu m;
the working wave bands of the first pump beam combiner (3) and the second pump beam combiner (12) are 1.5-2.5 mu m;
the working wave bands of the first wavelength division multiplexer (7) and the second wavelength division multiplexer (9) are respectively 1.5-2.5 μm and 2.8-4.5 μm.
6. The dual wavelength pump-based high efficiency 4 μm cascaded fiber amplifier according to any one of claims 1-5, wherein:
the optical fiber end cap (13) adopts CaF plated with a high-permeability film 2 Monocrystal end cap with transmittance not less than 99% @3.0 μm&4.3μm。
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