CN204118458U - A kind of single mode full-optical-fiber laser - Google Patents
A kind of single mode full-optical-fiber laser Download PDFInfo
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- CN204118458U CN204118458U CN201420472605.6U CN201420472605U CN204118458U CN 204118458 U CN204118458 U CN 204118458U CN 201420472605 U CN201420472605 U CN 201420472605U CN 204118458 U CN204118458 U CN 204118458U
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Abstract
The utility model embodiment provides a kind of single mode full-optical-fiber laser, at least comprises: all-fiber mode locking oscillator, pulse stretcher device, all-fiber amplifier and the fiber amplifier based on gain modulation; Described all-fiber mode locking oscillator is for exporting the ultrashort light pulse of compressible narrow spaces, and described pulse stretcher device, for carrying out broadening to the pulsewidth of described ultrashort light pulse; Described all-fiber amplifier is used for amplifying the power of the light pulse after broadening and compressing pulsewidth; The light pulse that the described fiber amplifier based on gain is used for described all-fiber amplifier exports is amplified further, and the core diameter of the described fibre core based on adulterating in the fiber amplifier of gain is less than the core diameter of its optical fiber.This novel peak power that improve light pulse, and before in the end exporting, light pulse is transmitted always in a fiber, is real full-optical-fiber laser.
Description
Technical field
The utility model belongs to field of laser device technology, particularly relates to a kind of single mode full-optical-fiber laser realizing GW level peak power.
Background technology
In ultrashort pulse laser field, the attainable peak power of fiber laser lags behind solid state laser greatly.In ordinary optical laboratory based on the femtosecond Ti: sapphire laser amplifier peak power of chirped pulse amplification thought already more than 1TW (1 TW terawatt), achieve 100TW to 1PW; And until 2014, the chirped pulse fiber amplifier peak power employing space grating compensation of dispersion only reaches 1GW (1mJ/800fs), namely 1,000,000,000 watts.Actual in the amplifier chain of real all-fiber, the peak power of pulse is only MW, i.e. megawatt.
Summary of the invention
In view of this, the purpose of this utility model is to provide a kind of single mode full-optical-fiber laser, to realize the peak power of GW level in all-fiber.
For achieving the above object, the utility model embodiment provides a kind of single mode full-optical-fiber laser, at least comprises: all-fiber mode locking oscillator, pulse stretcher device, all-fiber amplifier and the fiber amplifier based on gain modulation;
Described all-fiber mode locking oscillator is for exporting the ultrashort light pulse of compressible narrow spaces, and described pulse stretcher device, for carrying out broadening to the pulsewidth of described ultrashort light pulse;
Described all-fiber amplifier is used for amplifying the power of the light pulse after broadening and compressing pulsewidth;
The light pulse that the described fiber amplifier based on gain is used for described all-fiber amplifier exports is amplified further, and the core diameter of the described fibre core based on adulterating in the fiber amplifier of gain is less than the core diameter of the optical fiber that it is determined by fiber optic materials refraction index profile.
Preferably, described all-fiber mode locking oscillator is low-repetition-frequency all-fiber mode locking oscillator; Described pulse stretcher device is negative dispersion stretcher; Described all-fiber amplifier comprises the single mode all-fiber amplifier and double clad all-fiber amplifier that connect successively.
Preferably, described is silica fiber based on the optical fiber in the fiber amplifier of gain.
Preferably, described all-fiber mode locking oscillator is Totally positive dispersion all-fiber mode locking oscillator, and described pulse stretcher device is positive dispersion stretcher.
Preferably, the positive dispersion broadening pulsewidth of described positive dispersion stretcher for being provided by silica fiber.
Preferably, described all-fiber amplifier also comprises double clad all-fiber amplifier and double cladding large mode field all-fiber amplifier, is also provided with the frequency divider for reducing the repetition rate of light pulse or menu device between described double clad all-fiber amplifier and described double cladding large mode field all-fiber amplifier.
Preferably, described frequency divider or menu device are whole optical fiber acousto-optic device or electrooptic modulator.
Preferably, described single mode full-optical-fiber laser also comprises and the described negative dispersion compressor reducer be connected based on the fiber amplifier of gain, the pulsewidth of the light pulse that the fiber amplifier for compressing based on gain exports.
Preferably, described negative dispersion compressor reducer comprises the photon band-gap optical fiber and optical fiber end cap of drawing laser;
The light output end of described photon band-gap optical fiber combines with described optical fiber end cap, expands without interface to make the laser exported from the light output end of described photon band-gap optical fiber.
Preferably, the output of described photon band-gap optical fiber and the welding of described optical fiber end cap, the air-core near the light output end of described photon band-gap optical fiber and between covering air structure and described optical fiber end cap structure collapse;
Or;
The output of described photon band-gap optical fiber and the welding of described optical fiber end cap, described optical fiber end cap is all filled in air-core near the light output end of described photon band-gap optical fiber and covering air structure.
Beneficial effect:
The utility model is by arranging all-fiber mode locking oscillator, pulse stretcher device, all-fiber amplifier and the fiber amplifier based on gain, the peak power of light pulse is made to obtain large increase compared to existing technology, and before in the end exporting, light pulse is transmitted always in a fiber, is real full-optical-fiber laser.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The single mode full-optical-fiber laser structure chart that Fig. 1 provides for the utility model embodiment 1;
The single mode full-optical-fiber laser structure chart that Fig. 2 provides for the utility model embodiment 2;
Fig. 3 is the fiber amplifier design principle figure based on gain in the utility model;
The single mode full-optical-fiber laser structure chart that Fig. 4 provides for the utility model embodiment 3.
Embodiment
For making the object of the utility model embodiment, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the utility model embodiment, technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
The utility model example 1 provides a kind of single mode full-optical-fiber laser.As shown in Figure 1, this single mode full-optical-fiber laser at least comprises: all-fiber mode locking oscillator 11, pulse stretcher device 12, all-fiber amplifier 13 and the fiber amplifier 14 based on gain modulation.
Wherein, all-fiber mode locking oscillator 11 is for exporting the ultrashort light pulse of compressible narrow spaces, pulse stretcher device 12, for carrying out broadening to the pulsewidth of ultrashort light pulse, all-fiber amplifier 13 is for amplifying the power of the light pulse after broadening and compressing pulsewidth, and the fiber amplifier 14 based on gain amplifies further for the light pulse exported all-fiber amplifier 13.
In order to improve peak power further, suppress nonlinear growth, need the core diameter expanding optical fiber further, simultaneously in order to keep the high beam quality exported, realize real single-mode output, can not infinitely expand again, after all-fiber amplifier, during this is novel, be namely provided with the super large mould field fiber amplifier 14 based on gain modulation, the core diameter of the fibre core of its doping is slightly less than the core diameter of the optics fibre core determined by refraction index profile, instead of the two overlaps as common optical fiber.Like this, signal can be propagated in the optics fibre core that core diameter is larger, and is only exaggerated in the gain core of less doping.This design can improve the peak power of single-mode beams greatly.
As shown in Figure 3, the distribution of the doping content of the fibre core of doping and the refractive index of optics fibre core is shown.Its center line S1 is the radial distribution of the doping content in the fibre core of doping, and line S2 is the radial distribution of optics fiber core refractive index.Can go out from figure, the core diameter of the fibre core of doping is less than the core diameter of optics fibre core, and the refractive index of optics fibre core is suddenlyd change when arriving optics covering, the specific refractivity NA=0.07 of itself and fiber cladding.
This new embodiment 2,3 also each provides the single mode full-optical-fiber laser of two kinds of concrete structures.
Fig. 2 is the single mode full-optical-fiber laser structure chart in this new embodiment 2, and it specifically comprises:
The low-repetition-frequency all-fiber mode locking oscillator 21 connected successively, negative dispersion stretcher 22, single mode all-fiber amplifier 23, double clad all-fiber amplifier 24 and the fiber amplifier 25 based on gain modulation.
Above-mentioned low-repetition-frequency all-fiber mode locking oscillator 21 is lower for exporting repetition rate, the compressible light pulse of pulsewidth.As exported average power 1-2mW, repetition rate 1-2MHz, single pulse energy-1nJ, spectral width 10-15nm, the light pulse of compressible pulsewidth 100-200fs.
Above-mentioned negative dispersion stretcher 21 is for using the photonic band gap optical fiber (PBGF of anomalous dispersion, Photonic Band-Gap Fiber) or chirped fiber grating (CFBG, Chirped Fiber Bragg Grating) by pulse stretching.General commercial CFBG provides anomalous dispersion to be about 8ps/nm, can by the seed pulse broadening of 100-200fs to 80-120ps; And commercial PBGF provides anomalous dispersion to be about 0.12ps/nm/m, the PBGF of 50-80m length can by the seed pulse broadening of 100-200fs to 100-150ps.
For all-fiber amplifier, set up general all-fiber amplifying technique at present, can the pulse obtained in general commercial LMA (such as, 30/250) optical fiber up to 200KW peak power export.Meanwhile, optical pulse width also gradually reduces by the normal dispersion that normal optical fiber provides.
The mode locking pulse of about 1mW, pulse energy 1nJ, peak power 10W can be amplified to 200-300mW, peak power 3-5KW by single mode all-fiber amplifier 23, and pulsewidth is compressed to about 50-80ps.And double clad all-fiber amplifier by above-mentioned pulse amplifying to 200KW peak power, export 10W average power, pulse energy 10 μ J, pulsewidth is compressed to 30-50ps simultaneously.
With experiment, theoretical modeling all confirms that common double cladding large mode field optical fiber can support such pulse amplifying.
Obtain according to 50ps pulse nonlinear analog result in common double cladding large mode field optical fiber 30/250, its non-linear restriction is about 30 μ J.
Applicant experimentally, obtains the clean pulse spectrum that peak power is about 200KW in all-fiber amplifier.Experimentally found that, when peak power is higher than 500KW, stimulated Raman Scattering (SRS), four wave mixing (FWM) and Self-phase modulation (SPM) occur all.
In addition, this novel in be silica fiber based on the optical fiber in the fiber amplifier 25 of gain modulation.When not considering polarization, the dispersion in optical fiber is divided into material dispersion and waveguide dispersion (waveguide dispersion), for silica fiber, material dispersion is normally fixed, and generally speaking, the size of fibre core core diameter is larger, the better design of waveguide dispersion.Thus silica fiber not only can suppress nonlinear growth, but also can play the existing positive dispersion of increasing material simultaneously, for the dispersion brought in supplementary negative dispersion stretcher 22, and compression pulse width.While light pulse is amplified to 100-200 μ J by 10 μ J, by Pulse Compression to about 1ps or shorter, obtain the peak power of about 0.2GW.
As the concrete structure of Fig. 4 a kind of single mode full-optical-fiber laser disclosed in this new embodiment 3, comprising:
The Totally positive dispersion all-fiber mode locking oscillator 31 connected successively, positive dispersion stretcher 32, double clad all-fiber amplifier 33, frequency divider 34 or menu device 34, double cladding large mode field all-fiber amplifier 35, based on gain bar fiber amplifier 36 and the negative dispersion compressor reducer 37 of large core diameter.
Wherein, Totally positive dispersion all-fiber mode locking oscillator 31 is for exporting the ultrashort optical pulse signal of narrow spaces.The repetition rate of its light pulse exported is higher, is generally about 50MHz.As exported average power 200mW, repetition rate 50MHz, single pulse energy is about 4nJ, spectral width 10nm, the light pulse of compressible pulsewidth 100-200fs.
Because the light pulse exported in Totally positive dispersion all-fiber mode locking oscillator 31 has had larger positive dispersion, direct output pulse width can reach tens ps.But this is for thinking all-fiber amplifier of acquisition GW level, is still inadequate.For this reason, positive dispersion stretcher 32 can be used by further for pulsewidth broadening to ns level, the positive dispersion stretcher that concrete used silica fiber provides.
Light pulse average power in positive dispersion stretcher 32 is about 200mW, directly can be amplified to 10W in double-cladding fiber amplifier 33, and single pulse energy 200nJ, pulsewidth is about 1ns.
Then adopt frequency divider 34 or menu device 34, reduce the repetition rate of light pulse.Concrete adopted whole optical fiber acousto-optic device processed or electrooptic modulator, become repetition rate into 20KHz-1MHz from 50MHz.Power output after frequency division is 3mW-200mW.
The light pulse of corresponding 1MHz, the output about 200mW of frequency divider 34 or menu device 34, directly can be amplified to 10W in double-cladding fiber amplifier 35, and single pulse energy 10 μ J, pulsewidth is about 1ns, peak power 10KW.
During the light pulse of corresponding 20KHz, the output about 3mW of frequency divider 34 or menu device 34, in double-cladding fiber amplifier, 35 directly can be amplified to 400mW, and single pulse energy 20 μ J, pulsewidth is about 1ns, peak power 20KW.
The light pulse of corresponding 1MHz, the output of double-cladding fiber amplifier 35 is about 10W, and directly can be amplified to 100W in based on the super large mould area double-cladding fiber amplifier 36 of gain modulation, single pulse energy 100 μ J, pulsewidth is about 1ns, peak power 100KW.
The light pulse of corresponding 20KHz, the output about 400mW of double-cladding fiber amplifier 35, directly can be amplified to 20W in based on the super large mould area double-cladding fiber amplifier 36 of gain modulation, single pulse energy 1000 μ J, pulsewidth is about 1ns, peak power 1MW.
For compressing pulsewidth, basis is novel is also provided with negative dispersion compressor reducer 37, the concrete negative dispersion compressor reducer 37 based on PBGF that can be large core diameter.This negative dispersion compressor reducer 37 is as output device, and it can comprise the photon band-gap optical fiber and optical fiber end cap of drawing laser; Wherein the light output end of photon band-gap optical fiber combines with optical fiber end cap, expands without interface to make the laser exported from the light output end of photon band-gap optical fiber.
Concrete, the output of photon band-gap optical fiber and the welding of optical fiber end cap, the air-core near the light output end of photon band-gap optical fiber and between covering air structure and optical fiber end cap structure collapse.
Or the output of photon band-gap optical fiber and the welding of optical fiber end cap, optical fiber end cap is all filled in air-core near the light output end of photon band-gap optical fiber and covering air structure.
Above-mentioned optical fiber end cap can be centreless silica fiber.
In a preferred embodiment, the light output end of photon band-gap optical fiber is combined by optical bond method with between optical fiber end cap, the end face of the light output end of photon band-gap optical fiber is the end face of plane polishing or polishing inclined plane, is filled with quartz and the periphery of described photon band-gap optical fiber is also overlapped and had ceramic ferrule or capillary glass tube in the air-core near the light output end of photon band-gap optical fiber and covering.
Above-mentioned optical bond method is specially chemical activation Direct Bonding method.
Based on the said structure of negative dispersion compressor reducer 37, achieve laser to output in optical fiber end cap without interface and to realize expanding, and then improve the damage threshold of laser pulse on the end face of the output of photon band-gap optical fiber of ultra high power ultrashort pulse energy, avoid the destruction of laser pulse to fiber-optic output of high-energy short pulse.In addition, the hollow-core construction of photon band-gap optical fiber effectively can reduce the nonlinear effect in quartz material, is equivalent to the increase of effective area, and then improves the peak power transmitting laser in this optical fiber.And in the fiber chirped pulse amplification system of ultrashort pulse, the chromatic dispersion compensating function due to photon band-gap optical fiber can also gradually reduce pulse duration.
The above-mentioned technology about photon band-gap optical fiber and optical fiber end cap can see the content in number of patent application 2014102999814.
Through test, finally can obtain the output that pulsewidth is less than 1ps, thus all-fiber realizing 1,000,000,000 watts of (GW) peak powers exports.
In fact, due to the effect of Self-phase modulation (SPM), in amplifier chain, spectral width can broadening gradually, only otherwise emersion wave broken (Wave-breaking), last pulse remains compressible, utilizes SPM to obtain more wide spectral consciously, is conducive to obtaining more narrow spaces, and be likely compressed to 200fs or lower, thus obtain 5,000,000,000 watts or higher peak power.
The above is only preferred implementation of the present utility model; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (10)
1. a single mode full-optical-fiber laser, is characterized in that, described single mode full-optical-fiber laser at least comprises: all-fiber mode locking oscillator, pulse stretcher device, all-fiber amplifier and the fiber amplifier based on gain modulation;
Described all-fiber mode locking oscillator is for exporting the ultrashort light pulse of compressible narrow spaces, and described pulse stretcher device, for carrying out broadening to the pulsewidth of described ultrashort light pulse;
Described all-fiber amplifier is used for amplifying the power of the light pulse after broadening and compressing pulsewidth;
The light pulse that the described fiber amplifier based on gain is used for described all-fiber amplifier exports is amplified further, and the core diameter of the described fibre core based on adulterating in the fiber amplifier of gain is less than the core diameter of the optical fiber determined by fiber optic materials refraction index profile.
2. single mode full-optical-fiber laser as claimed in claim 1, it is characterized in that, described all-fiber mode locking oscillator is low-repetition-frequency all-fiber mode locking oscillator; Described pulse stretcher device is negative dispersion stretcher; Described all-fiber amplifier comprises the single mode all-fiber amplifier and double clad all-fiber amplifier that connect successively.
3. single mode full-optical-fiber laser as claimed in claim 2, it is characterized in that, described is silica fiber based on the optical fiber in the fiber amplifier of gain.
4. single mode full-optical-fiber laser as claimed in claim 1, it is characterized in that, described all-fiber mode locking oscillator is Totally positive dispersion all-fiber mode locking oscillator, and described pulse stretcher device is positive dispersion stretcher.
5. single mode full-optical-fiber laser as claimed in claim 4, is characterized in that, described positive dispersion stretcher is used for the positive dispersion broadening pulsewidth provided by silica fiber.
6. single mode full-optical-fiber laser as claimed in claim 5, it is characterized in that, described all-fiber amplifier also comprises double clad all-fiber amplifier and double cladding large mode field all-fiber amplifier, is also provided with the frequency divider for reducing the repetition rate of light pulse or menu device between described double clad all-fiber amplifier and described double cladding large mode field all-fiber amplifier.
7. single mode full-optical-fiber laser as claimed in claim 6, it is characterized in that, described frequency divider or menu device are whole optical fiber acousto-optic device or electrooptic modulator.
8. single mode full-optical-fiber laser as claimed in claim 6, it is characterized in that, described single mode full-optical-fiber laser also comprises and the described negative dispersion compressor reducer be connected based on the fiber amplifier of gain, the pulsewidth of the light pulse that the fiber amplifier for compressing based on gain exports.
9. single mode full-optical-fiber laser as claimed in claim 8, is characterized in that, described negative dispersion compressor reducer comprises the photon band-gap optical fiber and optical fiber end cap of drawing laser;
The light output end of described photon band-gap optical fiber combines with described optical fiber end cap, expands without interface to make the laser exported from the light output end of described photon band-gap optical fiber.
10. single mode full-optical-fiber laser as claimed in claim 9, it is characterized in that, the output of described photon band-gap optical fiber and the welding of described optical fiber end cap, the air-core near the light output end of described photon band-gap optical fiber and between covering air structure and described optical fiber end cap structure collapse;
Or;
The output of described photon band-gap optical fiber and the welding of described optical fiber end cap, described optical fiber end cap is all filled in air-core near the light output end of described photon band-gap optical fiber and covering air structure.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105140762A (en) * | 2015-07-30 | 2015-12-09 | 深圳市欧凌镭射科技有限公司 | Pulse fiber laser employing semiconductor laser seed source |
| CN109449731A (en) * | 2018-09-20 | 2019-03-08 | 深圳市大德激光技术有限公司 | A kind of ultrafast pulse optical fiber laser |
| CN109638628A (en) * | 2018-12-29 | 2019-04-16 | 苏州贝林激光有限公司 | Improve the control device and its method of laser stability |
| CN110544868A (en) * | 2019-08-29 | 2019-12-06 | 武汉虹拓新技术有限责任公司 | chirped square wave pulse amplification laser system |
| CN111431022A (en) * | 2020-03-04 | 2020-07-17 | 深圳市欧凌镭射科技有限公司 | Optical fiber amplifier and laser generator |
| CN112652940A (en) * | 2019-10-12 | 2021-04-13 | 北京热刺激光技术有限责任公司 | Multi-path output laser |
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- 2014-08-20 CN CN201420472605.6U patent/CN204118458U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105140762A (en) * | 2015-07-30 | 2015-12-09 | 深圳市欧凌镭射科技有限公司 | Pulse fiber laser employing semiconductor laser seed source |
| CN105140762B (en) * | 2015-07-30 | 2018-12-07 | 深圳市欧凌镭射科技有限公司 | A kind of pulse optical fiber of semiconductor laser seed source |
| CN109449731A (en) * | 2018-09-20 | 2019-03-08 | 深圳市大德激光技术有限公司 | A kind of ultrafast pulse optical fiber laser |
| CN109449731B (en) * | 2018-09-20 | 2019-09-20 | 深圳市大德激光技术有限公司 | A kind of ultrafast pulse optical fiber laser |
| CN109638628A (en) * | 2018-12-29 | 2019-04-16 | 苏州贝林激光有限公司 | Improve the control device and its method of laser stability |
| CN110544868A (en) * | 2019-08-29 | 2019-12-06 | 武汉虹拓新技术有限责任公司 | chirped square wave pulse amplification laser system |
| CN110544868B (en) * | 2019-08-29 | 2021-03-23 | 武汉虹拓新技术有限责任公司 | Chirped square wave pulse amplification laser system |
| CN112652940A (en) * | 2019-10-12 | 2021-04-13 | 北京热刺激光技术有限责任公司 | Multi-path output laser |
| CN111431022A (en) * | 2020-03-04 | 2020-07-17 | 深圳市欧凌镭射科技有限公司 | Optical fiber amplifier and laser generator |
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