CN114256728B - Beam splitting amplifying quasi-continuous optical fiber laser - Google Patents
Beam splitting amplifying quasi-continuous optical fiber laser Download PDFInfo
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- CN114256728B CN114256728B CN202111603865.3A CN202111603865A CN114256728B CN 114256728 B CN114256728 B CN 114256728B CN 202111603865 A CN202111603865 A CN 202111603865A CN 114256728 B CN114256728 B CN 114256728B
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- 239000013307 optical fiber Substances 0.000 title description 11
- 230000003287 optical effect Effects 0.000 claims abstract description 59
- 239000000835 fiber Substances 0.000 claims abstract description 45
- 238000005086 pumping Methods 0.000 claims abstract description 19
- 238000001514 detection method Methods 0.000 claims abstract description 4
- 239000004065 semiconductor Substances 0.000 claims description 29
- 238000005253 cladding Methods 0.000 claims description 26
- 238000012544 monitoring process Methods 0.000 claims description 12
- 230000008878 coupling Effects 0.000 claims description 11
- 238000010168 coupling process Methods 0.000 claims description 11
- 238000005859 coupling reaction Methods 0.000 claims description 11
- 230000003321 amplification Effects 0.000 claims description 9
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 9
- 230000005540 biological transmission Effects 0.000 claims description 4
- 230000003993 interaction Effects 0.000 claims description 4
- 230000001360 synchronised effect Effects 0.000 claims description 4
- 238000012937 correction Methods 0.000 claims description 2
- 230000005284 excitation Effects 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 abstract description 5
- 238000012545 processing Methods 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 2
- 229910052755 nonmetal Inorganic materials 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 3
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- 238000012994 industrial processing Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- 238000012806 monitoring device Methods 0.000 description 1
- 238000001208 nuclear magnetic resonance pulse sequence Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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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
- H01S3/23—Arrangements of two or more lasers not provided for in groups H01S3/02 - H01S3/22, e.g. tandem arrangements of separate active media
- H01S3/2383—Parallel arrangements
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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
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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
- H01S3/23—Arrangements of two or more lasers not provided for in groups H01S3/02 - H01S3/22, e.g. tandem arrangements of separate active media
- H01S3/2308—Amplifier arrangements, e.g. MOPA
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Abstract
A beam-splitting amplifying quasi-continuous fiber laser belongs to the technical field of laser, and aims to solve the problems of high preparation difficulty and poor laser stability under the high-repetition frequency condition in the prior art, wherein controlled devices of a laser seed laser are respectively connected with corresponding ports of a centralized control unit; the input end of the first beam splitter is connected with the output end of the seed laser; the optical path input ends of the optical path amplifying stages are respectively connected with the output ends of the beam combiners, the controlled devices of the optical path amplifying stages are respectively connected with the corresponding ports of the centralized control unit, the pumping pulse of the optical path amplifying stages keeps consistent with the seed laser in repetition frequency and pulse width, and the parameters of each path can be adjusted in a time delay mode according to the real-time power detection result; the input end of the beam combiner is respectively connected with the optical path output ends of the plurality of optical path amplifying stages; the light path input end of the laser output structure is connected with the output end of the beam combiner. Can be applied to the fields of nonmetal material processing, medical cosmetology, mid-infrared laser pumping and the like.
Description
Technical Field
The invention relates to a beam-splitting amplifying quasi-continuous fiber laser, which belongs to the technical field of laser and can be applied to the fields of nonmetal material processing, medical cosmetology, mid-infrared laser pumping and the like.
Background
Compared with solid laser and gas laser, the fiber laser has the outstanding advantages of high integration level, good beam quality, high energy conversion rate, easy parameter adjustment and the like, and is widely applied to the fields of industrial processing, military, medical treatment, sensing and the like, and the quasi-continuous fiber laser is an important category of fiber lasers. Quasi-continuous lasers can provide pulsed lasers on the order of microseconds to milliseconds, as compared to continuous lasers; the quasi-continuous fiber laser has higher single pulse energy and average power than the Q-switched fiber laser. In the processing fields of welding, cutting and the like, the repetition frequency and the average power of the quasi-continuous laser are improved, so that the processing efficiency can be remarkably improved; in the fields of medical treatment and mid-infrared pumping, parameters such as wavelength stability, pulse width, beam quality and the like of pulse laser directly influence the reliability and safety of rear-end use. Thus, high repetition frequency, high average power, high beam quality pulsed lasers are a necessary requirement for alignment of continuous lasers.
The invention adopts a laser power supply to control a pumping monitoring device to pulse and pump a plurality of paths of optical fiber lasers, controls and triggers each optical fiber laser through a circuit to keep the time sequence of each single path pulse sequence at equal intervals, and then realizes the time sequence synthesis of laser pulses through a beam combiner to improve the repetition frequency and average power of the laser pulses. However, the patent requires that parameters such as devices, optical fibers and the like of all paths of optical fiber lasers are kept highly consistent, so that the preparation difficulty is greatly increased, and poor spectrum overlap ratio is easily caused due to the difference of the parameters of the devices and the optical fibers, thereby reducing the quality of light beams; meanwhile, the patent realizes pulse synthesis by controlling delay time through a circuit, is difficult to ensure under the high-frequency condition (3 dB pulse width is in microsecond magnitude), and meanwhile, the high-frequency circuit has poor anti-interference performance and is easy to reduce the light beam quality.
Disclosure of Invention
The invention provides a beam-splitting amplifying quasi-continuous fiber laser, which aims to solve the problems of high preparation difficulty and poor stability of the laser under the high-repetition frequency condition in the prior art, adopts low-magnification amplification, synchronously amplifies the same seed light through a plurality of amplifying-stage light paths, and then simply combines the beams through a beam combiner, thereby improving the average power and the repetition frequency of the laser and keeping better beam quality.
The technical scheme for solving the technical problems is as follows:
The beam splitting amplifying quasi-continuous fiber laser is characterized by comprising a centralized control unit, a seed laser, a beam splitter I, a plurality of optical path amplifying stages, a beam combiner and a laser output structure;
The controlled devices of the seed laser are respectively connected with corresponding ports of the centralized control unit and are used for generating pulse seed laser;
The input end of the first beam splitter is connected with the output end of the seed laser, and is used for decomposing seed light into multiple paths of pulse lasers with equal power and consistent optical parameters through optical path coupling and outputting the pulse lasers to the next stage;
The optical path input ends of the optical path amplifying stages are respectively connected with the output ends of the beam combiners, the controlled devices of the optical path amplifying stages are respectively connected with the corresponding ports of the centralized control unit, the pumping pulse of the optical path amplifying stages is consistent with the seed laser in repetition frequency and pulse width, and the parameters of each path can be adjusted in a time delay mode according to the real-time power detection result;
the input end of the beam combiner is respectively connected with the optical path output ends of the optical path amplifying stages and is used for combining the pulse laser beams subjected to power amplification into one path for output;
the optical path input end of the laser output structure is connected with the output end of the beam combiner, and is used for outputting pulse laser with high average power and high repetition frequency according to different using conditions.
The beneficial effects of the invention are as follows: the invention adopts beam splitting amplification technology, and can effectively improve the laser pulse frequency and the average power. The technical approach is that seed lasers are split and injected into subsequent amplifying light paths through a certain light path to be respectively amplified, and the amplified lasers are coupled into one path through the light path, so that the average power is improved.
(1) The full optical fiber structure is adopted, so that high light beam quality can be well maintained, an additional space light path device is not required to be introduced, and the method is simple and easy to implement and easy to realize commercial production;
(2) The seed laser adopts a fiber laser structure, the laser parameters can be flexibly adjusted and the beam quality can be optimized by adjusting the optical device and the fiber type, and a seed light source with higher power can be provided;
(3) The middle-low power amplifying stage structure is adopted, so that the capacitance characteristics of the pumping light source and the high-power circuit are reduced, the steepness of the rising edge and the falling edge of the pulse is improved, and the repetition frequency of the laser pulse is improved;
(4) The mode of synchronous power amplification through a multipath amplification light path after beam splitting of the same seed source is adopted, so that the average power is improved while the quality of light beams is ensured;
(5) The light paths of the amplifying stages are within the centimeter-level error range, so that the pulse experimental error of beam splitting and amplifying can be ensured to be within the subnanosecond range, and the difficulty of pulse synchronous control and laser preparation is reduced.
Drawings
FIG. 1 is a schematic diagram of a beam-splitting amplifying quasi-continuous fiber laser according to the present invention.
In the figure, 1, a centralized control unit; 2. a seed laser; 3. a first beam splitter; 4. an optical path amplifying stage I; the optical path amplifying stage II 5, the optical path amplifying stage III 6 and the optical path amplifying stage IV 7; 8. a beam combiner; 9. and a laser output structure.
Fig. 2 is a schematic diagram of a seed laser according to the present invention.
In the figure, 2-1, semiconductor pump laser I; 2-2, a forward combiner; 2-3, a semiconductor pump laser II; 2-4, high reflection fiber gratings; 2-5, gain fiber I; 2-6, low reflection fiber gratings; 2-7 semiconductor pump lasers III; 2-8, a reverse beam combiner I; 2-9, a semiconductor pump laser is fourth; 2-10, cladding light stripper (CPS); 2-11, isolator I; 2-12, a beam splitter II; 2-13, photo Detector (PD) one;
fig. 3 is a schematic structural diagram of an amplifying optical path according to the present invention.
In the figure, 4-1, cladding light stripper one (CPS); 4-2, a semiconductor pump laser; 4-3, a forward beam combiner; 4-4, a semiconductor pump laser is six; 4-5, gain fiber II; 4-6, semiconductor pump lasers seven; 4-7, a reverse beam combiner II; 4-8, semiconductor pump laser eight; 4-9, cladding light stripper two (CPS); 4-10, an isolator II; 4-11, a beam splitter III; 4-12, a second Photoelectric Detector (PD);
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings.
As shown in fig. 1, a beam-splitting amplifying quasi-continuous fiber laser includes a central control unit 1, a seed laser 2, a beam splitter 3, a plurality of optical path amplifying stages, a beam combiner 8, and a laser output structure 9.
The centralized control unit 1 is composed of an FPGA and an additional circuit, and the functions of the centralized control unit comprise a pulse driving circuit 1-1 of a multi-channel pumping laser, a power monitoring and controlling circuit 1-2 and a man-machine interaction interface 1-3, wherein: the pulse driving circuit 1-1 of the multipath pumping laser is respectively connected with the seed laser 2 and the pumping lasers of a plurality of optical path amplifying stages; the power monitoring and controlling circuit 1-2 is connected with the seed laser 2 and the control circuits of the photoelectric detectors of the plurality of optical path amplifying stages; the man-machine interaction interface 1-3 is connected with an external control computer through serial port hardware, and the external control computer sets parameters such as temperature, repetition frequency, pulse width, power output and the like through serial ports.
The controlled devices of the seed laser 2 are respectively connected with the corresponding ports of the centralized control unit 1 and are used for generating pulse seed laser;
the input end of the first beam splitter 3 is connected with the output end of the seed laser 2, and is used for decomposing seed light into multiple paths of pulse laser with equal power and consistent optical parameters and outputting the pulse laser to the next stage through optical path coupling;
The optical path input ends of the optical path amplifying stages are respectively connected with the output ends of the beam combiners 3, the controlled devices of the optical path amplifying stages are respectively connected with the corresponding ports of the centralized control unit 1, the pumping pulses of the optical path amplifying stages are consistent with the seed lasers 2 in repetition frequency and pulse width, and the parameters of each path can be adjusted in a time delay mode according to real-time power detection results;
The input end of the beam combiner 8 is respectively connected with the optical path output ends of the optical path amplifying stages, and is used for combining the pulse laser beams of which the power is amplified into one path for output;
The light path input end of the laser output structure 9 is connected with the output end of the beam combiner 8, and is used for outputting pulse laser with high average power and high repetition frequency according to different using conditions.
As shown in fig. 2, the seed laser 2 includes a plurality of semiconductor pump lasers, a forward combiner 2-2, a high reflection fiber grating 2-4, a gain fiber 1-5, a low reflection fiber grating 2-6, a backward combiner 2-8, a cladding light stripper 2-10, a first isolator 2-11, a second beam splitter 2-12, and a photodetector 2-13.
The semiconductor pump lasers have the same input voltage and current parameters;
The input end of the forward beam combiner 2-2 is connected with the output ends of the semiconductor pump laser I2-1 and the semiconductor pump laser II 2-3, and is used for coupling pulse pump power into one path for output;
The high reflection fiber grating 2-4 pump light input end is connected with the output end of the forward beam combiner 2-2, the high reflection fiber grating 2-4 pump light output end is connected with the gain fiber one 2-5, the pump light output end of the low reflection fiber grating 2-6 is connected with the gain fiber one 2-5, and the high reflection fiber grating 2-4 pump light output end, the gain fiber one 2-5 and the pump light output end form an optical resonant cavity for generating laser;
the pump light output end of the first 2-8 reverse beam combiner is connected with the pump light input end of the low reflection fiber grating 2-6, the pump light input end of the first 2-8 reverse beam combiner is connected with the output ends of the third 2-7 semiconductor pump lasers and the fourth 2-9 semiconductor pump lasers, and the pump light output end is used for coupling pulse pump power into one path for output and outputting signal laser pulses;
the input end of the cladding light stripper 2-10 is connected with the laser pulse output end of the reverse beam combiner I2-8 and is used for stripping residual pumping power and cladding laser;
The input end of the first isolator 2-11 is connected with the output end of the cladding light stripper 2-10 and is used for isolating return light and ensuring the stability of the resonant cavity;
The input end of the second beam splitter 2-12 is connected with the output end of the first isolator 2-11, and is used for dividing pulse laser into two paths, wherein one path of high power is used for laser transmission, and the other path of low power is used for power monitoring. The beam splitting ratio of the beam splitters II 2-12 is higher than 99:1.
The first 2-13 input end of the Photoelectric Detector (PD) is connected with the second 2-12 low-power output end of the beam splitter, and the first 2-13 output end of the Photoelectric Detector (PD) is connected with the corresponding port of the centralized control unit for real-time power monitoring.
The optical path amplifying stages have the same structure, and all adopt medium-low power amplification, taking the optical path amplifying stage one 4 in fig. 1 as an example, the composition and the connection mode are as follows:
As shown in FIG. 3, the first optical path amplifying stage 4 comprises a first cladding light stripper 4-1, a plurality of semiconductor pump lasers, a forward combiner 4-3, a gain fiber 4-5, a reverse combiner second 4-7, a second cladding light stripper 4-9, a second isolator 4-10, a third beam splitter 4-11 and a second photodetector 4-12.
The cladding light stripper I4-1 is used for stripping residual pump light and cladding laser; the semiconductor pump lasers have the same input voltage and current parameters;
The pump input end of the forward beam combiner 4-3 is connected with the output ends of the semiconductor pump laser I4-2 and the semiconductor pump laser II 4-4 and is used for coupling pulse pump power into one path for output, and the pulse laser input end of the forward beam combiner 4-3 is connected with the cladding light stripper I4-1;
One end of the gain fiber 4-5 is connected with the output end of the forward beam combiner 4-2 and is used for amplifying the pulse laser power;
The pump light output end of the second beam combiner 4-7 is connected with the other end of the gain optical fiber 4-5, the pump light input end of the second beam combiner 4-7 is connected with the output ends of the third semiconductor pump laser 4-6 and the fourth semiconductor pump laser 4-8, and the pump light input end is used for coupling the pulse pump power into one path for output and outputting signal laser pulses;
The input end of the cladding light stripper II 4-9 is connected with the laser pulse output end of the reverse beam combiner II 4-7 and is used for stripping residual pumping power and cladding laser;
The input end of the second isolator 4-10 is connected with the output end of the second cladding light stripper 4-9, and is used for isolating return light and ensuring the stability of an amplified light path;
The input end of the third beam splitter 4-11 is connected with the output end of the second isolator 4-10, and is used for dividing pulse laser into two paths, one path of high power is used for laser transmission, and the other path of low power is used for power monitoring. The beam splitter three 4-11 has a beam splitting ratio higher than 99:1.
The input end of the second photoelectric detector 4-12 is connected with the low-power output end of the beam splitter 4-12, and the output end of the second photoelectric detector 4-12 is connected with a corresponding port of the centralized control unit for real-time power monitoring.
The implementation mode of the optical fiber pulse laser beam splitting and amplifying is as follows:
The centralized control unit 1 carries out synchronous pulse excitation with the same parameters (including repetition frequency and pulse width) on the seed laser 2 and the pump lasers of the plurality of optical path amplifying stages, and simultaneously utilizes the first photoelectric detectors 2-13 and the second photoelectric detectors 4-12 to collect feedback signals of each path in real time so as to carry out contrast correction on pulse time delay of the seed laser 2 and the plurality of optical path amplifying stages. The seed beam quality is optimized by utilizing the advantage of easy adjustment of the parameters of the seed laser 2; the seed light is split into a plurality of light path amplifying stages by utilizing the first beam splitter 3, so that the consistency of laser signals is ensured; the advantage that the pulse edge of the middle-low power optical path amplifying stage is steeper than that of the high-power amplifying stage is utilized, so that the repetition frequency of laser pulses is increased; the beam combiner 8 is utilized to combine the outputs of a plurality of optical path amplifying stages connected in parallel, so that the power of pulse laser is improved; finally, a proper laser output structure 9 is selected according to different application scenes to perform quasi-continuous laser output. Even if the optical fibers and devices of the optical path amplification stages have certain differences, the integral optical path difference is quite easy to achieve the centimeter level, the time delay among the pulses of the optical path amplification stages is the subnanosecond level, and compared with the time delay adjustment by using a circuit, the preparation difficulty is greatly reduced.
Claims (3)
1. The beam splitting amplifying quasi-continuous fiber laser is characterized by comprising a centralized control unit (1), a seed laser (2), a beam splitter I (3), a plurality of optical path amplifying stages, a beam combiner (8) and a laser output structure (9);
The controlled devices of the seed laser (2) are respectively connected with the corresponding ports of the centralized control unit (1) and are used for generating pulse seed laser;
The input end of the first beam splitter (3) is connected with the output end of the seed laser (2), and is used for decomposing seed light into multiple paths of pulse lasers with equal power and consistent optical parameters through optical path coupling and outputting the pulse lasers to the next stage;
the optical path input ends of the plurality of optical path amplifying stages are respectively connected with the output end of the first beam splitter (3), the controlled devices of the optical path amplifying stages are respectively connected with the corresponding ports of the centralized control unit (1), the pumping pulse of the plurality of optical path amplifying stages is consistent with the seed laser (2) in repetition frequency and pulse width, and the parameters of each path can be adjusted in a time delay mode according to the real-time power detection result;
The input end of the beam combiner (8) is respectively connected with the optical path output ends of the optical path amplifying stages, and is used for combining the pulse laser amplified by power into one path for output;
the light path input end of the laser output structure (9) is connected with the output end of the beam combiner (8) and is used for outputting pulse laser with high average power and high repetition frequency according to different using conditions;
The seed laser (2) comprises a plurality of semiconductor pump lasers A, a forward beam combiner I (2-2), a high reflection fiber grating (2-4), a gain fiber I (2-5), a low reflection fiber grating (2-6), a backward beam combiner I (2-8), a cladding light stripper I (2-10), an isolator I (2-11), a beam splitter II (2-12) and a photoelectric detector I (2-13);
the light path amplifying stages have the same structure, wherein the light path amplifying stage I (4) comprises a cladding light stripper I (4-1), a plurality of semiconductor pump lasers B, a forward beam combiner II (4-3), a gain fiber II (4-5), a backward beam combiner II (4-7), a cladding light stripper II (4-9), an isolator II (4-10), a beam splitter III (4-11) and a photoelectric detector II (4-12);
The centralized control unit (1) carries out synchronous and same-parameter pulse excitation on the seed laser (2) and the pump lasers of the multiple optical path amplifying stages, and simultaneously utilizes the photoelectric detectors I (2-13) and the photoelectric detectors II (4-12) to acquire feedback signals of all paths in real time so as to carry out contrast correction on pulse time delay of the seed laser (2) and the multiple optical path amplifying stages;
The centralized control unit (1) is composed of an FPGA and an additional circuit, and comprises a pulse driving circuit of a multi-channel pumping laser, a power monitoring and controlling circuit and a man-machine interaction interface, wherein: the pulse driving circuit of the multipath pumping laser is respectively connected with the seed laser (2) and the pumping lasers of the plurality of optical path amplifying stages; the power monitoring and controlling circuit is connected with the seed laser (2) and the control circuits of the photoelectric detectors of the plurality of optical path amplifying stages; the man-machine interaction interface is connected with an external control computer through serial port hardware.
2. A beam-splitting amplifying quasi-continuous fiber laser according to claim 1,
The output ends of a semiconductor pump laser A I (2-1) and a semiconductor pump laser A II (2-3) in the seed laser (2) are respectively connected with the input end of a forward beam combiner I (2-2) and are used for coupling pulse pump power into one path for output;
The high reflection fiber grating (2-4) pump light input end is connected with the output end of the forward beam combiner I (2-2), the high reflection fiber grating (2-4) pump light output end is connected with the gain fiber I (2-5), and the low reflection fiber grating (2-6) pump light output end is connected with the gain fiber I (2-5), so as to form an optical resonant cavity for generating laser;
the pump light output end of the first reverse beam combiner (2-8) is connected with the pump light input end of the low reflection fiber grating (2-6), and the pump light input end of the first reverse beam combiner (2-8) is connected with the output ends of the semiconductor pump lasers A three (2-7) and A four (2-9) and is used for coupling pulse pump power into one path for output and outputting signal laser pulses;
The input end of the cladding light stripper (2-10) is connected with the laser pulse output end of the reverse beam combiner I (2-8) and is used for stripping residual pumping power and cladding laser;
The input end of the first isolator (2-11) is connected with the output end of the cladding light stripper (2-10) and is used for isolating return light and ensuring the stability of the resonant cavity;
The input end of the second beam splitter (2-12) is connected with the output end of the first isolator (2-11) and is used for dividing pulse laser into two paths, wherein one path of high power is used for laser transmission, and the other path of low power is used for power monitoring;
The input end of the first photoelectric detector (2-13) is connected with the low-power output end of the second beam splitter (2-12), and the output end of the first photoelectric detector (2-13) is connected with a corresponding port of the centralized control unit (1) for real-time power monitoring.
3. A beam-splitting amplifying quasi-continuous fiber laser according to claim 1,
The first cladding light stripper (4-1) is connected with the pulse laser input end of the second forward beam combiner (4-3) and is used for stripping residual pump light and cladding laser;
The output ends of the semiconductor pump laser B I (4-2) and the semiconductor pump laser B II (4-4) in the optical path amplification stage I (4) are respectively connected with the pump input end of the forward beam combiner II (4-3) and are used for coupling pulse pump power into one path for output;
One end of the gain fiber II (4-5) is connected with the output end of the forward beam combiner II (4-3) and is used for amplifying pulse laser power;
The pump light output end of the second reverse beam combiner (4-7) is connected with the other end of the second gain fiber (4-5), the pump light input end of the second reverse beam combiner (4-7) is connected with the output ends of the third semiconductor pump laser (4-6) and the fourth semiconductor pump laser (4-8) and is used for coupling pulse pump power into one path for output and outputting signal laser pulses;
the input end of the cladding light stripper II (4-9) is connected with the laser pulse output end of the reverse beam combiner II (4-7) and is used for stripping residual pumping power and cladding laser;
The input end of the second isolator (4-10) is connected with the output end of the second cladding light stripper (4-9) and is used for isolating return light and ensuring the stability of an amplified light path;
The input end of the third beam splitter (4-11) is connected with the output end of the second isolator (4-10) and is used for dividing pulse laser into two paths, wherein one path of high power is used for laser transmission, and the other path of low power is used for power monitoring;
The input end of the second photoelectric detector (4-12) is connected with the low-power output end of the third beam splitter (4-11), and the output end of the second photoelectric detector (4-12) is connected with a corresponding port of the centralized control unit (1) for real-time power monitoring.
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