CN103730822A - Ultrashort pulse optical fiber laser system - Google Patents
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- CN103730822A CN103730822A CN201310706352.4A CN201310706352A CN103730822A CN 103730822 A CN103730822 A CN 103730822A CN 201310706352 A CN201310706352 A CN 201310706352A CN 103730822 A CN103730822 A CN 103730822A
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Abstract
The invention relates to an ultrashort pulse optical fiber laser system. The ultrashort pulse optical fiber laser system comprises an optical fiber laser, optical fiber circulators, a chirp optical fiber bragg grating, a single-mode optical fiber amplifier, a collimating lens and a body chirp grating. The optical fiber laser sequentially passes through the optical fiber circulators and is connected into the single-mode optical fiber amplifier, the single-mode optical fiber amplifier, the collimating lens and the body chirp grating are sequentially arranged on the same light path, and the optical fiber circulators are connected into the chirp optical fiber bragg grating. The ultrashort pulse optical fiber laser system is high in integration degree, completely solidified and dispense with adjustment.
Description
Technical field
The invention belongs to laser technology field, relate to a kind of ultrashort pulse fiber laser system, relate in particular to a kind of ultrashort pulse fiber laser system based on chirped fiber grating stretcher and body chirp grating compressor reducer.
Background technology
Using optical fiber as the Laser Devices of carrier have that volume is little, integrated level is high, good stability, the advantage such as low in energy consumption, maturation along with large mould area double-cladding optical fiber fabrication technology and technology, in conjunction with chirped pulse amplification, the generation of ultra-short pulse laser and amplification are able to realize in optical fiber.The basic line of the chirped pulse amplification that the optical fibre device of take is basic components and parts is still the generation of ultrashort pulse, the broadening of ultrashort pulse, pulse energy is amplified and the compression of high energy pulse.
Broadening and compression stage in pulse, need to have the diffraction optical element compared with large dispersion.The way that fiber chirped pulse amplification system is generally taked is at present to adopt chirped fiber grating as pulse stretcher, this grating is the periodic index of refraction variation medium that is scribed at inside of optical fibre, it has the guide properties of optical fiber, but there is the diffractive features to the incident field of different wave length simultaneously, a kind of full fiberize diffraction optical device like this, as simple and effective dispersive medium, is tool integrated level and compatible pulse dispersion management device in fiber chirped pulse amplification system.Corresponding pulse shortener is due to the superlaser that will bear after amplification with it, cannot adopt again the grating of optical fiber structure to realize, traditional way is to adopt reflective diffraction gratings or transmission-type diffraction grating to carry out the delay on space to laser beam, realizes dispersion compensation.But the space optical path structure that this plurality of components and parts form is responsive to beam incident angle, to vibration sensing, and adjustment process is very difficult, because of rather than a kind of compression device of applicable industrial quarters complex environment use.The development in recent years this diffraction optical element of body chirp grating that got up, it is a kind of solid transparent device, can have larger clear aperature to accept superlaser, have chromatic dispersion compensating function, and using method is simple, easily debugs simultaneously.
Chirped fiber grating and body chirp grating are all the fixing devices of dispersion measure, pulse stretching and decrement that it can provide just immobilize after grating is produced, so be generally the body chirp grating that adopts a pair of identical parameter in the use of body chirp grating, one as pulse stretcher, and another is as pulse shortener.Yet once pulse stretcher adopts body chirp grating, the broadening stage of optical-fiber laser amplification system has just lost all optical fibre structure, the space optical path of increase makes system become complicated, unstable.The dispersion parameters of chirped fiber grating and body grating is incomplete same, and in fiber amplifier, extra various optical fibre devices also can be introduced extra dispersion by paired pulses, makes the total broadening amount of pulse be difficult to mate completely with the decrement of body chirp grating.
Summary of the invention
In order to solve the above-mentioned technical problem existing in background technology, the invention provides a kind of high integration, the completely crued and ultrashort pulse fiber laser system that need not regulate.
Technical solution of the present invention is: the invention provides a kind of ultrashort pulse fiber laser system, its special character is: described ultrashort pulse fiber laser system comprises fiber laser, optical fiber circulator, chirped fiber grating, monomode fiber amplifier, collimating lens and body chirp grating; Described fiber laser accesses monomode fiber amplifier by optical fiber circulator successively; Described monomode fiber amplifier, collimating lens and body chirp grating are successively set in same light path; Described optical fiber circulator access chirped fiber grating.
Above-mentioned optical fiber circulator comprises light input end, light output end and the link that connects chirped fiber grating; Described fiber laser is by light input end incoming fiber optic circulator; Described optical fiber circulator accesses monomode fiber amplifier by light output end.
Above-mentioned ultrashort pulse fiber laser system also comprises double-cladding fiber amplifier; Described monomode fiber amplifier is by broadening optical fiber access double-cladding fiber amplifier; Described double-cladding fiber amplifier collimating lens and body chirp grating are successively set in same light path.
Above-mentioned chirped fiber grating and body chirp grating are all to have fixed-bandwidth and the fixing dispersion element of abbe number.
Above-mentioned chirped fiber grating is the chirped fiber grating with positive dispersion characteristic.
Above-mentioned fiber laser is mode locked fiber laser.
Above-mentioned monomode fiber amplifier is by wavelength division multiplexer and mix ytterbium monomode fiber and form.
Above-mentioned double-cladding fiber amplifier is comprised of pump combiner and Double Cladding Ytterbium Doped Fiber.
Above-mentioned collimating lens is planoconvex spotlight.
Through collimating lens, be incident to the light beam of body chirp grating and have angle between body chirp grating diffraction light beam out; The scope of described angle is 4 °～6 °.
Advantage of the present invention is:
The invention provides a kind of ultrashort pulse fiber laser system, this laser system is when the dispersion parameters of design pulse shortener, have a mind to design its dispersion total amount and be greater than the dispersion total amount that chirped fiber grating stretcher provides, and the corresponding dispersion measure of this difference is greater than the material dispersion amount of 100 meters of silica fibers.In optical fiber amplification system, the total length of all optical fiber is can be over 100 meters, thereby this design is greater than by the negative dispersion amount that compressor reducer is introduced total positive dispersion amount that chirped fiber grating and Transmission Fibers can provide to pulse, compressor reducer has too much compensated the broadening amount of stretcher.The negative dispersion amount of these unnecessary compensation is offset the way of conducting fiber lengths by change, the present invention adds the optical fiber of extra certain length in the amplification link of pulse, the positive dispersion amount that these optical fiber provide is determined by its length completely, so the positive dispersion amount that these optical fiber that additionally add provide can accurately be controlled by setting its length.When the positive dispersion amount that this section of broadening optical fiber provides, just in time offset the negative dispersion amount that compressor reducer is too much introduced, light pulse has just obtained dispersion counteracting, and pulse composition is in time just without postponing, and pulse duration is the narrowest.The present invention is used as broadening and the compression device of pulse in fiber chirped pulse amplification system with chirped fiber grating and body chirp grating, and utilize the length adjustment of optical fiber in amplification system to realize dispersion-balanced between pulse stretcher and compressor reducer, obtain the burst pulse of full dispersion compensation; Thereby a kind of high integration, completely crued, the ultrashort pulse fiber laser system that need not regulate are provided.
Accompanying drawing explanation
Fig. 1 is the light channel structure schematic diagram of ultrashort pulse fiber laser system provided by the present invention;
Fig. 2 is the pulse autocorrelator trace based on after laser system broadening provided by the present invention;
Fig. 3 is the laser pulse autocorrelator trace based on after laser system compression provided by the present invention;
Wherein:
1-ultrashort pulse fiber laser; 2-optical fiber circulator; 3-chirped fiber grating; 4-monomode fiber amplifier; 5-broadening optical fiber; 6-double-cladding fiber amplifier; 7-collimating lens; 8-body chirp grating.
Embodiment
Referring to Fig. 1, the invention provides a kind of ultrashort pulse fiber laser system, ultrashort pulse fiber laser system comprises fiber laser, optical fiber circulator 2, chirped fiber grating 3, monomode fiber amplifier 4, broadening optical fiber 5, collimating lens 7 and body chirp grating 8; Fiber laser is successively by optical fiber circulator 2 and monomode fiber amplifier 4 access broadening optical fiber 5; Broadening optical fiber 5, collimating lens 7 and body chirp grating 8 are successively set in same light path; Optical fiber circulator 2 access chirped fiber gratings 3.
Ultrashort pulse fiber laser system also comprises double-cladding fiber amplifier 6; Monomode fiber amplifier 4 is by broadening optical fiber 5 access double-cladding fiber amplifiers 6; Double-cladding fiber amplifier 6 collimating lenses 7 and body chirp grating 8 are successively set in same light path.
Chirped fiber grating 3 and body chirp grating 8 are all to have fixed-bandwidth and the fixing dispersion element of abbe number.
Chirped fiber grating 3 is the chirped fiber gratings 3 with positive dispersion characteristic.
Fiber laser is mode locked fiber laser; Mode locked fiber laser is 50MHz from the laser repetition rate of output tail optical fiber output, the about 400fs of pulsewidth, centre wavelength 1053nm, average power 1mw.
Double-cladding fiber amplifier 6 is comprised of pump combiner and Double Cladding Ytterbium Doped Fiber
Collimating lens 7 is planoconvex spotlights.
Through collimating lens 7, be incident to the light beam of body chirp grating 8 and have angle between body chirp grating 8 diffraction light beam out; The scope of angle is 4 °～6 °.
Primary structure of the present invention is that the chirped pulse that fiber laser and amplifier forms amplifies and compressibility.Ultrashort pulse fiber laser 1 is as seed light source, for system provides the original pulse of narrow pulsewidth; Chirped fiber grating 3 as pulse stretcher original pulse broadening; Fiber amplifiers at different levels are pulse energy lifting pieces; Body chirp grating 8 is compressed to subpicosecond as pulse shortener by the pulse duration of amplification.
Chirped fiber grating 3 before the fiber amplifier is to have fixed-bandwidth and the fixing device of abbe number, and for the incident light pulse of certain bandwidth, the broadening amount that chirped fiber grating 3 provides is definite value.The general chirped fiber grating 3 with positive dispersion characteristic that adopts carrys out stretched pulse, pulse after this broadening in fiber amplifier link while transmitting the amplification that obtains energy, its pulsewidth in amplification process due to the impact of fiber optic materials dispersion, have variation slightly, for near the light field 1 micron wave length, common silica fiber and Yb dosed optical fiber are the material of positive dispersion characteristic, and this is consistent with chirped fiber grating 3 dispersion characteristics.Thereby the optical fiber of light pulse process is longer, material positive dispersion is larger to its broadening, so after amplifying output, the broadening amount sum that the time width of light pulse provides for chirped fiber grating 3 broadening amounts and fiber optic materials dispersion.
If the pulse through broadening and after amplifying is again through having the effect of the optical element of Negative Dispersion Properties, its broadening amount will be offset, and pulse is compressed in time.The size of this decrement depends on total positive dispersion amount of pulse experience and the cancellation level of total negative dispersion amount, if negative dispersion amount has just in time compensated positive dispersion amount, each spectral component in pulse just no longer has delay in time, has obtained the narrowest pulse.So pulse shortener is just to provide medium or the components and parts of negative dispersion, its dispersion measure that can provide positive dispersion broadening amount that just in time compensating light pulse has.
The similar chirped fiber grating 3 of body chirp grating 8, is also to have fixed-bandwidth and the fixing Dispersive Devices of abbe number, and it can only provide fixing negative dispersion amount for the light pulse of inciding wherein, is difficult to offset completely the positive dispersion broadening of light pulse experience.
The original pulse of this fiber laser system is produced by mode locked fiber laser, and this mode locked fiber laser is all optical fibre structure, from the laser repetition rate 50MHz of output tail optical fiber output, the about 400fs of pulsewidth, centre wavelength 1053nm, average power 1mw.This very narrow femtosecond pulse is directly transported to chirped fiber grating 3 stretchers by the mode of fused fiber splice.
Chirped fiber grating 3 is reflective gratings, is welded together use with optical fiber circulator, forms stretcher.Optical fiber circulator 2 has three ports, and 1. end is input, receives the light signal of self mode-locked laser; 2. end, for connecting the port of chirped fiber grating 3, receives the reverberation from chirped fiber grating 3; 3. end is reverberation output, namely by the pulse output after broadening.Light impulse length after broadening reaches hundreds of psecs, but energy is lower, carry out the lifting of energy through multi-stage fiber amplifier.First order fiber amplifier is monomode fiber amplifier 4, by wavelength division multiplexer with mix ytterbium monomode fiber and form.Light pulse after preliminary amplification is carried out extra broadening through the Hi1060 type single mode silica fiber of hundreds of meters, and broadening amount depends on the length of this volume silica fiber, can carry out cutting optical fiber or make up the dispersion measure that optical fiber provides to change this volume optical fiber in experiment.The rear connection of broadening optical fiber 5 second level fiber amplifier, is comprised of pump combiner and Double Cladding Ytterbium Doped Fiber, and the pulse after twice broadening is carried out to further energy lift, under the pump power of several watts, amplifies output average light power and reaches hundreds of milliwatts.
Between all devices, be all that fused fiber splice connects above, realize the system configuration of reliable and stable and high integration.Laser after amplification utilizes planoconvex spotlight collimation, the about 3mm of collimated light spot diameter, incide the plane of incidence of body chirp grating 8, approximately 2 °～3 ° of the normal of this plane of incidence and the angles of incident beam, make through body chirp grating 8 diffraction light beam out to be different from the direction output of optical path of incident light.The width that uses the light pulse after the compression of autocorrelation function analyzer detection bodies grating increases and decreases the length of broadening optical fiber 5 in front end light path, until record the shortest pulsewidth (<1000fs) on autocorrelation function analyzer simultaneously.So far, completed there is cramped construction exempt from building of the ultrashort pulse fiber laser system that regulates.This device carrying out in this laboratory has obtained average power 560mw in building, the ultra-short pulse laser output of pulsewidth 606fs, and the pulse width measure after pulse stretching and after compression is as the autocorrelator trace of Fig. 2 and Fig. 3.
Claims (10)
1. a ultrashort pulse fiber laser system, is characterized in that: described ultrashort pulse fiber laser system comprises fiber laser, optical fiber circulator, chirped fiber grating, monomode fiber amplifier, collimating lens and body chirp grating; Described fiber laser accesses monomode fiber amplifier by optical fiber circulator successively; Described monomode fiber amplifier, collimating lens and body chirp grating are successively set in same light path; Described optical fiber circulator access chirped fiber grating.
2. ultrashort pulse fiber laser system according to claim 1, is characterized in that: described optical fiber circulator comprises light input end, light output end and the link that connects chirped fiber grating; Described fiber laser is by light input end incoming fiber optic circulator; Described optical fiber circulator accesses monomode fiber amplifier by light output end.
3. ultrashort pulse fiber laser system according to claim 1 and 2, is characterized in that: described ultrashort pulse fiber laser system also comprises double-cladding fiber amplifier; Described monomode fiber amplifier is by broadening optical fiber access double-cladding fiber amplifier; Described double-cladding fiber amplifier collimating lens and body chirp grating are successively set in same light path.
4. ultrashort pulse fiber laser system according to claim 3, is characterized in that: described chirped fiber grating and body chirp grating are all to have fixed-bandwidth and the fixing dispersion element of abbe number.
5. ultrashort pulse fiber laser system according to claim 4, is characterized in that: described chirped fiber grating is the chirped fiber grating with positive dispersion characteristic.
6. ultrashort pulse fiber laser system according to claim 5, is characterized in that: described fiber laser is mode locked fiber laser.
7. ultrashort pulse fiber laser system according to claim 6, is characterized in that: described monomode fiber amplifier is by wavelength division multiplexer and mix ytterbium monomode fiber and form.
8. ultrashort pulse fiber laser system according to claim 7, is characterized in that: described double-cladding fiber amplifier is comprised of pump combiner and Double Cladding Ytterbium Doped Fiber.
9. ultrashort pulse fiber laser system according to claim 8, is characterized in that: described collimating lens is planoconvex spotlight.
10. ultrashort pulse fiber laser system according to claim 9, is characterized in that: through collimating lens, be incident to the light beam of body chirp grating and have angle between body chirp grating diffraction light beam out; The scope of described angle is 4 °～6 °.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104319607A (en) * | 2014-11-14 | 2015-01-28 | 武汉理工光科股份有限公司 | Laser light source based on two-stage amplification of Er-doped fibers |
| 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 |
| CN105553559A (en) * | 2016-01-05 | 2016-05-04 | 烽火通信科技股份有限公司 | Long-distance passive optical network system based on chirp grating and dispersion compensation method |
| CN105633780A (en) * | 2016-04-07 | 2016-06-01 | 北京信息科技大学 | Mode locking optical fiber laser amplification system on the basis of chirp optical fiber grating |
| CN106451042A (en) * | 2016-10-14 | 2017-02-22 | 南方科技大学 | Chirped pulse amplification system for fiber laser |
| CN107534261A (en) * | 2015-03-31 | 2018-01-02 | 港大科桥有限公司 | Space chirp chamber for stretching/compressing optical pulse in time |
| 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 |
| CN113612536A (en) * | 2021-08-04 | 2021-11-05 | 乔文超 | Laser dispersion compensation structure based on grating |
| CN113708841A (en) * | 2021-09-24 | 2021-11-26 | 中国传媒大学 | Method for compensating ultra-short pulse dispersion and high-order dispersion based on fiber bragg grating |
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| CN108061980A (en) * | 2017-12-18 | 2018-05-22 | 中国科学院西安光学精密机械研究所 | Chirped fiber grating dispersion amount adjustment method, device and the system comprising the device |
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| CN104319607A (en) * | 2014-11-14 | 2015-01-28 | 武汉理工光科股份有限公司 | Laser light source based on two-stage amplification of Er-doped fibers |
| CN107534261A (en) * | 2015-03-31 | 2018-01-02 | 港大科桥有限公司 | Space chirp chamber for stretching/compressing optical pulse in time |
| 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 |
| CN105553559A (en) * | 2016-01-05 | 2016-05-04 | 烽火通信科技股份有限公司 | Long-distance passive optical network system based on chirp grating and dispersion compensation method |
| CN105633780A (en) * | 2016-04-07 | 2016-06-01 | 北京信息科技大学 | Mode locking optical fiber laser amplification system on the basis of chirp optical fiber grating |
| CN106451042A (en) * | 2016-10-14 | 2017-02-22 | 南方科技大学 | Chirped pulse amplification system for fiber laser |
| 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 |
| CN113612536A (en) * | 2021-08-04 | 2021-11-05 | 乔文超 | Laser dispersion compensation structure based on grating |
| CN113708841A (en) * | 2021-09-24 | 2021-11-26 | 中国传媒大学 | Method for compensating ultra-short pulse dispersion and high-order dispersion based on fiber bragg grating |
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