CN109586148B - Pulse fiber laser based on main oscillation power amplifier structure - Google Patents
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- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 claims 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
- H01S3/05—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
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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
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
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Abstract
The invention discloses a pulse fiber laser based on a main oscillation power amplifier structure, which comprises a pulse seed light source, an input isolator, a wavelength division multiplexer, a pump laser, a plurality of doped fibers and an output isolator; the doped optical fibers comprise doped optical fibers for amplifying the pulse seed light and doped optical fibers used as saturated absorbers for absorbing ASE noise; the pulse seed light source, the input isolator, the wavelength division multiplexer, the doped optical fiber and the output isolator are sequentially connected, and the wavelength division multiplexer is also connected with the pump laser. The invention introduces a doped optical fiber with very short length in the middle of the doped optical fiber of the optical amplifier as a saturated absorber, and can reduce the influence of the increase of ASE power on the gain of the laser during the interval of two pulses, thereby improving the peak power and the signal-to-noise ratio of the output pulse light.
Description
Technical Field
The invention belongs to the technical field of fiber lasers, and particularly relates to a pulse fiber laser based on a main oscillation power amplifier structure, which can effectively improve the output power of pulses, reduce the output amplified spontaneous emission noise (ASE noise) of the laser and improve the pumping conversion efficiency.
Background
The high-power pulse fiber laser has wide application in the fields of laser processing, material processing, laser radar, remote sensing and the like. The acousto-optic Q-switched fiber laser generates laser pulses through a Q-switch technology, but the output pulse width, the repetition frequency and other parameters are limited in adjustment range; in the optical fiber laser based on the Main Oscillation Power Amplifier (MOPA) structure, a semiconductor laser or the like is used as a seed light source to generate pulse signal light, and then the seed light is power-amplified in the optical fiber amplifier. The seed source of the semiconductor laser can be directly electrically modulated, nanosecond pulses are easy to generate, and good pulse shapes are obtained, so that the pulse laser with the MOPA structure has the advantages of flexible parameters and wide adjustment range. In laser processing requiring narrow pulse width and high repetition frequency and laser radar requiring nanosecond-order narrow pulse, a pulse fiber laser of MOPA structure is widely adopted.
In a pulsed fiber laser of MOPA construction, the duty cycle of the optical pulses is very low, for example: the pulse light source applied to the vehicle-mounted laser radar has a typical pulse width of 2ns, a repetition pulse frequency of about 500kHz and a duty ratio of only 1/1000. In this way, in the MOPA structure optical amplifier, since the pumping operation of the pump light is used, the particle inversion degree of the doped fiber has enough time to recover to a higher level between two adjacent pulses, so that after one pulse passes, the upper level particle inversion degree can be fully recovered before the next pulse. Amplified Spontaneous Emission (ASE) power traveling in both the forward and reverse directions of the doped fiber between two adjacent pulses will also increase rapidly, and they will consume a significant amount of the upper level population of the doped fiber, especially across the doped fiber, thereby reducing the gain obtainable by the optical pulses. For MOPA structure adopting multi-stage amplification, not only ASE generated by the stage causes the reduction of pulse gain, but also ASE generated in the upper-stage amplifier is amplified step by step, and the influence of ASE is more serious.
In a fiber pulse laser of MOPA construction, ASE suppression therefore has a crucial impact on the rise of pulse output power. The current ASE inhibiting method mainly comprises an optical filter method, a fast optical switching method and a saturated absorption method. (1) The optical filtering method is to introduce a narrow-band optical filter between doped optical fibers or between two stages of optical amplifiers to filter out broadband ASE and reduce the influence of ASE. Common filters include filters, fiber gratings, and the like. In general, in order to obtain a good ASE inhibition effect, the bandwidth of the optical filter is required to be as narrow as possible, but this puts higher demands on the wavelength stability and the spectral width of the seed light source; (2) The fast optical switching method adopts acousto-optic, electro-optic switch, electro-absorption modulator or semiconductor optical amplifier, etc. to cut off the optical path or introduce great loss in the pulse gap time, and inhibit ASE generation in the pulse gap period. However, because the fast optical switch of the discrete device is required to be coupled with the optical fiber, the fast optical switch usually has larger insertion loss, and synchronous pulse driving is required, so that the complexity of the pulse optical fiber laser is increased, and the fast optical switch is rarely adopted in practice; (3) The saturated absorber is in a saturated absorption state when a high peak power light pulse arrives, most of the light pulse energy passes through, and during the pulse gap, small power ASE is under the saturated absorption power and is absorbed by the saturated absorber, so that the increase of ASE power is restrained. Many materials are available as saturated absorbers, for example: graphene, carbon nanotubes, black phosphazene, semiconductor quantum dots, semiconductor saturable absorption mirrors (SESAM), and the like. In the fiber laser at present, the saturated absorbers are mainly used for realizing mode locking and Q-switching of the laser, but due to higher saturated absorption power, if the saturated absorbers are used for inhibiting ASE in an optical amplifier, the loss of pulse power is larger, and besides a semiconductor saturated absorber mirror, other materials are not mature and stable commercial devices at present.
Disclosure of Invention
The invention aims at solving the problems in the prior art and provides a pulse fiber laser based on a main oscillation power amplifier structure, which can effectively improve the output power of pulses, reduce the output amplified spontaneous emission noise (ASE noise) of the laser and improve the pump conversion efficiency.
In order to achieve the above purpose, the invention adopts the following technical scheme:
A pulse fiber laser based on a main oscillation power amplifier structure comprises a pulse seed light source, an input isolator, a wavelength division multiplexer, a pump laser, a plurality of doped fibers and an output isolator; the doped optical fibers comprise doped optical fibers for amplifying the pulse seed light and doped optical fibers used as saturated absorbers for absorbing ASE noise; the output end of the pulse seed light source is connected with the input end of the input isolator, the output end of the input isolator is connected with the signal end of the wavelength division multiplexer, the pumping end of the wavelength division multiplexer is connected with the output end of the pumping laser, the public end of the wavelength division multiplexer is connected with the input end of the doped optical fiber, the output end of the doped optical fiber is connected with the input end of the output isolator, and the output end of the output isolator is the output end of the pulse optical fiber laser.
Preferably, the pump laser is a single-mode pump laser; the input isolator is a first isolator, and the output isolator is a second isolator; the wavelength division multiplexer comprises a first wavelength division multiplexer, a second wavelength division multiplexer and a third wavelength division multiplexer; the doped optical fibers comprise a first doped optical fiber, a second doped optical fiber and a third doped optical fiber; the pulse seed light source, the first isolator, the first wavelength division multiplexer, the first doped optical fiber, the second wavelength division multiplexer, the second doped optical fiber, the third wavelength division multiplexer, the third doped optical fiber and the second isolator are sequentially connected; the first wavelength division multiplexer is also connected with a single-mode pump laser, and the second wavelength division multiplexer is also connected with a third wavelength division multiplexer.
Further, the first doped optical fiber, the second doped optical fiber and the third doped optical fiber are erbium-doped optical fibers; the first doped optical fiber and the third doped optical fiber are used for amplifying the pulse seed light; the second doped fiber acts as a saturated absorber to absorb ASE noise.
Preferably, the pump laser is a multimode pump laser; the wavelength division multiplexer comprises a fourth wavelength division multiplexer and a fifth wavelength division multiplexer, and the fourth wavelength division multiplexer comprises a first multimode pump combiner and a first pump stripper; the fifth wavelength division multiplexer comprises a second multimode pump combiner and a second pump stripper; the input isolator is a first isolator, the output isolator is a second multimode isolator, and a first multimode isolator is arranged between the first pump stripper and the fifth doped optical fiber; the plurality of doped optical fibers comprise a fourth doped optical fiber, a fifth doped optical fiber and a sixth doped optical fiber; the pulse fiber laser also comprises a multimode pump beam splitter; the pulse seed light source, the first isolator, the first multimode pump combiner, the fourth doped optical fiber, the first pump stripper, the first multimode isolator, the fifth doped optical fiber, the second multimode pump combiner, the sixth doped optical fiber, the second pump stripper and the second multimode isolator are sequentially connected; the multimode pump laser is connected with the first multimode pump combiner through a multimode pump beam splitter, and the multimode pump beam splitter is also connected with the second multimode pump combiner.
Further, the fourth doped optical fiber, the fifth doped optical fiber and the sixth doped optical fiber are double-clad ytterbium-doped optical fibers or erbium-ytterbium co-doped optical fibers; the fourth doped optical fiber and the sixth doped optical fiber are used for amplifying the pulse seed light; the fifth doped fiber acts as a saturated absorber to absorb ASE noise.
Specifically, the doped optical fiber used as a saturated absorber for absorbing ASE noise is a doped optical fiber with a short length, and the length of the doped optical fiber is 30-100 cm; the principle of absorbing ASE noise is as follows: when the high-peak-power light pulse passes through the doped optical fiber, the doped optical fiber is in a saturated absorption state, and most of light pulse energy passes through; during the pulse gap, the small-power ASE is under saturated absorption power and is absorbed by the saturated absorber, so that the increase of ASE power is restrained.
Further, the saturated absorption effect of the saturated absorber is: the stronger the light intensity passing through the saturated absorber, the weaker the absorption of working substances in the saturated absorber to light, and when the light intensity is strong enough, the saturated absorber is bleached, and strong light is not absorbed any more, and ASE noise under the absorption power of the saturated absorber is absorbed by the saturated absorber.
Compared with the prior art, the invention has the beneficial effects that: (1) According to the invention, a doped optical fiber with a very short length is introduced into the middle of the doped optical fiber of the optical amplifier to serve as a saturated absorber, so that the influence of the increase of ASE power on the gain of the laser during the interval of two pulses can be reduced, and the peak power and the signal-to-noise ratio of the output pulse light are improved; (2) For the multi-stage optical amplifier structure, the doped optical fiber in the middle of two optical amplifier stages can also effectively reduce ASE generated by the doped optical fiber in the upper stage between pulse gaps to enter the doped optical fiber in the lower stage, and can also improve the peak power and the signal to noise ratio of the output pulse light; (3) The doped optical fiber which is the same as the optical amplifier is used as a saturated absorber, so that the optical fiber has the advantages of easy integrated coupling with other devices in an optical path, small insertion loss, simple structure and the like; compared with the commonly used optical filter method, the method has the advantages of insensitivity to the wavelength stability and spectral line width of the seed laser; compared with the novel saturated absorber such as graphene, carbon nano tube, black phosphorus, semiconductor quantum dot, quantum well and the like, the saturated absorber has the advantages of low saturated absorption power, easy adjustment and compact structure.
Drawings
Fig. 1 is a schematic block diagram of a pulsed fiber laser based on the structure of a main oscillation power amplifier according to embodiment 1;
Fig. 2 is a schematic block diagram of a pulsed fiber laser based on the main oscillation power amplifier structure of embodiment 2;
In the figure: 1. a pulsed seed light source; 2. a first isolator; 3. a first wavelength division multiplexer; 4. a first doped optical fiber; 5. a second wavelength division multiplexer; 6. a second doped optical fiber; 7. a third wavelength division multiplexer; 8. a third doped optical fiber; 9. a second isolator; 10. a single-mode pump laser; 11. a first multimode pump combiner; 12. a fourth doped optical fiber; 13. a first pump stripper; 14. a first multimode isolator; 15. a fifth doped optical fiber; 16. a second multimode pump combiner; 17. a sixth doped optical fiber; 18. a second pump stripper; 19. a second multimode isolator; 20. a multimode pump beam splitter; 21. multimode pump lasers.
Detailed Description
The following description of the embodiments of the present invention will be made more apparent and fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by one of ordinary skill in the art without undue burden on the person of ordinary skill in the art based on embodiments of the present invention, are within the scope of the present invention.
Example 1
As shown in fig. 1, the present embodiment provides a pulse fiber laser based on a main oscillation power amplifier structure, which includes a pulse seed light source 1, a first isolator 2, a first wavelength division multiplexer 3, a first doped fiber 4, a second wavelength division multiplexer 5, a second doped fiber 6, a third wavelength division multiplexer 7, a third doped fiber 8, a second isolator 9, and a single-mode pump laser 10;
Specifically, the output end of the pulse seed light source 1 is connected to the input end of the first isolator 2, the output end of the first isolator 2 is connected to the signal end of the first wavelength division multiplexer 3, the pump end of the first wavelength division multiplexer 3 is connected to the output end of the single-mode pump laser 10, the common end of the first wavelength division multiplexer 3 is connected to the input end of the first doped optical fiber 4, the output end of the first doped optical fiber 4 is connected to the signal end of the second wavelength division multiplexer 5, the common end of the second wavelength division multiplexer 5 is connected to the input end of the second doped optical fiber 6, the output end of the second doped optical fiber 6 is connected to the signal end of the third wavelength division multiplexer 7, the common end of the third wavelength division multiplexer 7 is connected to the input end of the third doped optical fiber 8, the output end of the third doped optical fiber 8 is connected to the input end of the second isolator 9, and the output end of the second isolator 9 is the output end of the pulse laser.
Specifically, the pulsed seed light source 1 needs to select a pulsed laser capable of generating high-quality pulsed signals, and a low-noise pulsed signal light source is selected from the source.
Specifically, the first isolator 2 and the second isolator 9 are used for preventing backward ASE or outputting pulsed light feedback, avoiding forming ASE parasitic oscillation, avoiding that the subsequent ASE enters the doped fiber of the previous stage to reduce the inversion degree of the upper-level particles and the pump conversion efficiency.
Specifically, the first doped optical fiber 4, the second doped optical fiber 6 and the third doped optical fiber 8 are erbium-doped optical fibers; the first doped optical fiber 4 and the third doped optical fiber 8 are used for amplifying the pulse seed light; the second doped fiber 6 acts as a saturated absorber to absorb ASE noise.
Further, the doped optical fiber used as the saturated absorber for absorbing ASE noise is a doped optical fiber with a shorter length, the length of the doped optical fiber is 30-100 cm, the length of the doped optical fiber can be adjusted according to the doping concentration of the doped optical fiber, the larger the doping concentration is, the shorter the length is, the smaller the doping concentration is, and the length is longer; the principle of absorbing ASE noise is as follows: when the high-peak-power light pulse passes through the doped optical fiber, the doped optical fiber is in a saturated absorption state, and most of light pulse energy passes through; during the pulse gap, the small-power ASE is under saturated absorption power and is absorbed by the saturated absorber, so that the increase of ASE power is restrained.
The working principle of the pulse fiber laser of the embodiment is as follows: the pulse light generated by the pulse seed light source 1 sequentially passes through the first isolator 2 and the first wavelength division multiplexer 3 and then enters the first doped optical fiber 4, doped particles of the first doped optical fiber 4 are transferred to an upper energy level after pumped by the single-mode pump laser 10, stimulated radiation amplification is generated in the transmission process of the pulse seed light in the first doped optical fiber 4, and pre-amplification of the pulse seed light is realized; the first isolator 2 is used for isolating the backward ASE and preventing the backward ASE from entering the pulse seed light source 1 when the pulse seed light is amplified in the first doped optical fiber 4 and the forward ASE and the backward ASE are generated; the amplified pulse light and forward ASE enter the second doped optical fiber 6 together through the second wavelength division multiplexer 5, the second doped optical fiber 6 plays a role of a saturated absorber, the saturated absorber is bleached, the absorption of the pulse light is small, the absorption of the forward ASE is large, the forward ASE generated by the first doped optical fiber 4 which is reduced by the second doped optical fiber 6 enters the third doped optical fiber 8, the pulse signal amplified by the first doped optical fiber 4 also enters the third doped optical fiber 8 through the second wavelength division multiplexer 5, the second doped optical fiber 6 and the third wavelength division multiplexer 7, and the pulse light is output through the second isolator 9 after the third doped optical fiber 8 is amplified again through stimulated radiation.
Wherein the purpose of connecting the common end of the second wavelength division multiplexer 5 with the common end of the third wavelength division multiplexer 7 is to prevent the pump light remaining in the first doped fiber 4 from entering the second doped fiber 6, the second doped fiber 6 being used as a saturated absorber; after the common terminal of the second wavelength division multiplexer 5 is connected with the common terminal of the third wavelength division multiplexer 7, the remaining pump light in the first doped optical fiber 4 directly enters the common terminal of the third wavelength division multiplexer 7 through the common terminal of the second wavelength division multiplexer 5.
The pulse laser adopting the erbium-doped optical fiber can achieve pulse peak power of tens of watts, and can be applied to optical fiber sensing and short-distance laser radar.
Example 2
As shown in fig. 2, the present embodiment provides a pulse fiber laser based on a main oscillation power amplifier structure, which is different from the above embodiment 1 mainly in that the pump laser in the present embodiment is a multimode pump laser 21;
Specifically, the pulse fiber laser of the present embodiment includes a pulse seed light source 1, a first isolator 2, a first multimode pump combiner 11, a fourth doped fiber 12, a first pump stripper 13, a first multimode isolator 14, a fifth doped fiber 15, a second multimode pump combiner 16, a sixth doped fiber 17, a second pump stripper 18, a second multimode isolator 19, a multimode pump beam splitter 20, and a multimode pump laser 21;
specifically, the output end of the pulse seed light source 1 is connected to the input end of the first isolator 2, the output end of the first isolator 2 is connected to the signal end of the first multimode pump combiner 11, the pump end of the first multimode pump combiner 11 is connected to the small end of the multimode pump splitter 20, the common end of the first multimode pump combiner 11 is connected to the input end of the fourth doped optical fiber 12, the output end of the fourth doped optical fiber 12 is connected to the input end of the first pump stripper 13, the output end of the first pump stripper 13 is connected to the input end of the first multimode isolator 14, the output end of the first multimode isolator 14 is connected to the input end of the fifth doped optical fiber 15, the output end of the fifth doped optical fiber 15 is connected to the signal end of the second multimode pump combiner 16, the pump end of the second multimode pump combiner 16 is connected to the large end of the multimode pump splitter 20, the input end of the multimode pump splitter 20 is connected to the output end of the multimode pump laser 21, the output end of the common end of the second multimode pump combiner 16 is connected to the output end of the sixth doped optical fiber 17, and the output end of the second pump splitter 19 is connected to the output end of the second pump splitter 18.
Specifically, the pulsed seed light source 1 needs to select a pulsed laser capable of generating high-quality pulsed signals, and a low-noise pulsed signal light source is selected from the source.
Specifically, the first isolator 2, the first multimode isolator 14, and the second multimode isolator 19 are configured to prevent backward ASE or output pulsed optical feedback, avoid forming ASE parasitic oscillation, prevent the subsequent ASE from entering the previous stage doped fiber, reduce the inversion degree of the upper level particles, and reduce the pump conversion efficiency.
Specifically, the fourth doped optical fiber 12, the fifth doped optical fiber 15 and the sixth doped optical fiber 17 may be dual-clad ytterbium-doped optical fibers or erbium-ytterbium co-doped optical fibers; the fourth doped optical fiber 12 and the sixth doped optical fiber 17 are used for amplifying the pulse seed light; the fifth doped fiber 15 acts as a saturated absorber to absorb ASE noise.
The working principle of the pulse fiber laser of the embodiment is as follows: the pulse light generated by the pulse seed light source 1 sequentially passes through the first isolator 2 and the first multimode pump combiner 11 and then enters the fourth doped optical fiber 12, the multimode pump light generated by the multimode pump laser 21 is divided into two beams by the multimode pump beam splitter 20, one beam enters the signal end of the first multimode pump combiner 11 to be optically coupled with the pulse seed, and the other beam enters the signal end of the second multimode pump combiner 16 to be optically coupled with the pulse after ASE noise is filtered; the doped particles of the fourth doped fiber 12 are transited to the upper energy level after pumped by the multimode pump laser 21, and stimulated radiation amplification is generated in the transmission process of the pulse light in the fourth doped fiber 12, so that the pre-amplification of the pulse seed light is realized; the first isolator 2 is used for isolating backward ASE in the fourth doped optical fiber 12 along with the generation of forward ASE and backward ASE when the pulse seed light is amplified in the fourth doped optical fiber 12, so that the backward ASE in the fourth doped optical fiber is prevented from entering the seed light, the pump light which is transmitted through the double-clad optical fiber cladding is stripped after the multi-mode pump light which is not absorbed in the fourth doped optical fiber 12 passes through the first pump stripper 13, the residual pump light which is transmitted in the double-clad optical fiber core is isolated and filtered through the first multi-mode isolator 14, the fifth doped optical fiber 15 is prevented from entering the fifth doped optical fiber 15, the fifth doped optical fiber 15 plays a role of a saturated absorber, the absorption of the forward ASE is relatively large because the pulse signal is relatively bleached, the forward ASE generated by the fourth doped optical fiber 12 which is reduced through the fifth doped optical fiber 15 enters the sixth doped optical fiber 17, the stimulated radiation amplification of the pulse light occurs in the transmission process of the sixth doped optical fiber 17, the residual pump light which is not absorbed in the multi-mode pump light passes through the second pump stripper 18, the residual pump light which is transmitted through the double-clad optical fiber core is stripped after the multi-mode pump light passes through the second pump stripper 18, and the second pump optical fiber 19 passes through the second isolator 19, and the second pump optical fiber 19 is output after the pulse signal is stripped.
The pulse laser adopting the double-cladding ytterbium-doped optical fiber or the erbium-ytterbium co-doped optical fiber can achieve the pulse peak power reaching kilowatt level, and can be applied to long-distance laser radars such as vehicle-mounted and wind-measuring.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The pulse fiber laser based on the main oscillation power amplifier structure is characterized by comprising a pulse seed light source, an input isolator, a wavelength division multiplexer, a pump laser, a plurality of doped fibers and an output isolator; the doped optical fibers comprise doped optical fibers for amplifying the pulse seed light and doped optical fibers used as saturated absorbers for absorbing ASE noise; the output end of the pulse seed light source is connected with the input end of the input isolator, the output end of the input isolator is connected with the signal end of the wavelength division multiplexer, the pumping end of the wavelength division multiplexer is connected with the output end of the pumping laser, the public end of the wavelength division multiplexer is connected with the input end of the doped optical fiber, the output end of the doped optical fiber is connected with the input end of the output isolator, and the output end of the output isolator is the output end of the pulse optical fiber laser.
2. The pulsed fiber laser based on a main oscillation power amplifier architecture of claim 1, wherein the pump laser is a single-mode pump laser; the input isolator is a first isolator, and the output isolator is a second isolator; the wavelength division multiplexer comprises a first wavelength division multiplexer, a second wavelength division multiplexer and a third wavelength division multiplexer; the doped optical fibers comprise a first doped optical fiber, a second doped optical fiber and a third doped optical fiber; the pulse seed light source, the first isolator, the first wavelength division multiplexer, the first doped optical fiber, the second wavelength division multiplexer, the second doped optical fiber, the third wavelength division multiplexer, the third doped optical fiber and the second isolator are sequentially connected; the first wavelength division multiplexer is also connected with a single-mode pump laser, and the second wavelength division multiplexer is also connected with a third wavelength division multiplexer.
3. The pulsed fiber laser based on a main oscillation power amplifier architecture of claim 2, wherein the first, second and third doped fibers are erbium doped fibers; the first doped optical fiber and the third doped optical fiber are used for amplifying the pulse seed light; the second doped fiber acts as a saturated absorber to absorb ASE noise.
4. The pulsed fiber laser based on a main oscillation power amplifier architecture of claim 1, wherein the pump laser is a multimode pump laser; the wavelength division multiplexer comprises a fourth wavelength division multiplexer and a fifth wavelength division multiplexer, and the fourth wavelength division multiplexer comprises a first multimode pump combiner and a first pump stripper; the fifth wavelength division multiplexer comprises a second multimode pump combiner and a second pump stripper; the input isolator is a first isolator, the output isolator is a second multimode isolator, and a first multimode isolator is arranged between the first pump stripper and the fifth doped optical fiber; the plurality of doped optical fibers comprise a fourth doped optical fiber, a fifth doped optical fiber and a sixth doped optical fiber; the pulse fiber laser also comprises a multimode pump beam splitter; the pulse seed light source, the first isolator, the first multimode pump combiner, the fourth doped optical fiber, the first pump stripper, the first multimode isolator, the fifth doped optical fiber, the second multimode pump combiner, the sixth doped optical fiber, the second pump stripper and the second multimode isolator are sequentially connected; the multimode pump laser is connected with the first multimode pump combiner through a multimode pump beam splitter, and the multimode pump beam splitter is also connected with the second multimode pump combiner.
5. The pulsed fiber laser of claim 4, wherein said fourth, fifth and sixth doped fibers are double clad ytterbium doped fibers or erbium ytterbium co-doped fibers; the fourth doped optical fiber and the sixth doped optical fiber are used for amplifying the pulse seed light; the fifth doped fiber acts as a saturated absorber to absorb ASE noise.
6. The pulsed fiber laser of claim 1, wherein the doped fiber used as a saturation absorber to absorb ASE noise is a short length doped fiber having a length of 30-100 cm.
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