CN103779780A - Multistage ultra-short pulse laser stepped compression system - Google Patents
Multistage ultra-short pulse laser stepped compression system Download PDFInfo
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- CN103779780A CN103779780A CN201310745794.XA CN201310745794A CN103779780A CN 103779780 A CN103779780 A CN 103779780A CN 201310745794 A CN201310745794 A CN 201310745794A CN 103779780 A CN103779780 A CN 103779780A
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Abstract
The present invention belongs to the optical field, and particularly relates to a multistage ultra-short pulse laser stepped compression system. The multistage ultra-short pulse laser stepped compression system comprises the components of: an ultra-short laser pulse transmitter, a first-stage compression device and a second-stage compression device. The first-stage compression device comprises the components of: a pulse broadening device, a pre-amplifier, a dispersion amount compression element, a first collimating lens and a first-stage chirped grating; wherein the pulse broadening device, the pre-amplifier, the dispersion amount compression element, the first collimating lens and the first-stage chirped grating are successively arranged in a transmitting optical path of the ultra-short laser pulse transmitter. The second-stage compression device comprises the components of: a focusing lens, a main amplifier, a second collimating lens and a second-stage chirped grating; wherein the focusing lens, the main amplifier, the second collimating lens and the second-stage chirped grating are successively arranged in a diffraction optical path of the first-stage compression device. The multistage ultra-short pulse laser stepped compression system of the invention has the functions of: realizing stepped compression on the laser pulse with random broadening amount, and simultaneously greatly reducing compression loss amount of outputted high-energy laser.
Description
Technical field
The invention belongs to optical field, be specifically related to a kind of multistage ultra-short pulse laser substep compressibility.
Background technology
Ultrashort pulse superlaser is generally obtained in conjunction with chirped pulse amplification by multistage laser amplifier.This chirped pulse amplification route has comprised the generation of laser pulse, the broadening of pulse, the compression of pulse energy amplification and pulse, wherein pulse is amplified this link and is comprised multiple amplification branch, these branch's serial substeps, in the links of this technology path, play the effect that laser pulse is amplified step by step gradually.And two covering devices that broadening link in route and last compression link are echoed before and after being, the former realizes paired pulses stretching in time, produces long pulse; The latter provides contrary function, by long pulse at time domain data compression to the shortest state.
At broadening and the compression stage of pulse, need to there is the diffraction optical element compared with large dispersion.The way that chirped pulse amplification system is generally taked be at present adopt diffraction grating to or chirped fiber grating as pulse stretcher, the equal feature of the angle of diffraction of the light field of this dispersion management element utilization to different wave length or diffraction precedence realizes the delay in time of pulse different wave length.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 of this multiple components and parts composition is to beam incident angle sensitivity, 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.
Body chirp grating is the device of fixing dispersion measure, the pulse compression amount that it can provide has just immobilized after grating is produced, and the time explanation (compression) that body grating can provide is at present measured limited, generally be no more than 500ps, so for wider stretched pulse (> 500ps), must use multiple body gratings to compress it.But each body grating has certain diffraction loss and material absorption loss (loss amounts to approximately 40%) to the light inciding wherein, if use multiple body gratings, loss meeting double increase along with the increase of body grating quantity that compressor reducer is overall, this just greatly reduces the whole efficiency of laser system.
Summary of the invention
In order to solve the defect in background technology, the present invention proposes and a kind ofly utilize polylith body grating to realize the laser pulse of any broadening amount to be carried out to substep compression, greatly reduce the multistage ultra-short pulse laser substep compressibility of the compression loss amount of finally exporting superlaser simultaneously.
Concrete technical scheme of the present invention is:
A kind of multistage ultra-short pulse laser substep compressibility, is characterized in that: comprise ultrashort laser pulse reflector, one-level compression set and two-stage compression device; Described one-level compression set is arranged on the emitting light path of ultrashort laser pulse reflector; Described two-stage compression device is arranged on the optical diffraction of one-level compression set; Angle between the optical diffraction of the emitting light path of described ultrashort laser pulse reflector and one-level compression set is θ; The span of θ is 6 ° of 0 ° of < θ <;
Described one-level compression set comprises the pulse stretcher, prime amplifier, dispersion compensating element, the first collimating lens, the one-level body chirp grating that set gradually along ultrashort laser pulse reflector emitting light path;
Described two-stage compression device comprises the condenser lens, main amplifier, the second collimating lens and the secondary body chirp grating that set gradually along one-level compression set optical diffraction.
Above-mentioned pulse stretcher is made up of chirped fiber grating and optical circulator, and described optical circulator is provided with three ports and is connected with chirped fiber grating, ultrashort laser pulse reflector and prime amplifier respectively.
Above-mentioned prime amplifier comprises one-level amplifier, two-stage amplifier and connects the dispersion compensating element of one-level amplifier and two-stage amplifier.
Above-mentioned one-level amplifier is monomode fiber amplifier; Described two-stage amplifier is made up of pump combiner and Double Cladding Ytterbium Doped Fiber.
Above-mentioned dispersion compensating element is silica fiber.
The invention has the advantages that:
1, the present invention adopts the classification of multiple body chirp grating to compress laser pulse, has greatly reduced the compression loss amount of final output superlaser.
2, in the present invention, prime amplifier adopts two-stage fiber amplifier, has guaranteed the energy of system energy output laser pulse.
3, the present invention adopts dispersion compensating element, has guaranteed that pulse stretching amount and the decrement of system mated completely.
4, in the present invention, be between 0 °～6 ° through the angle between input path and the emitting light path of body chirp grating, guaranteed that chirp grating diffraction light beam is out to be different from the direction output of input path.
Accompanying drawing explanation
Fig. 1 is system configuration schematic diagram of the present invention.
Fig. 2 adopts the laser pulse autocorrelator trace oscillogram after the compression of two-stage body grating substep.
Reference numeral is as follows:
1-ultrashort laser reflector, 2-pulse stretcher, 3-chirped fiber grating, 4-optical circulator, 5-one-level amplifier, 6-dispersion compensating element, 7-two-stage amplifier, 8-one-level body chirp grating, 9-condenser lens, 10-the first collimating lens, 11-main amplifier, 12-the second collimating lens, 13-secondary body chirp grating.
Embodiment
The present invention proposes a kind of the building of ultra-short pulse laser substep compressibility of efficient, the high integration based on body chirp grating, having verified that polylith body chirp grating is realized carries out Efficient Compression to the stretched pulse of any pulsewidth.
Below describe the present invention:
A kind of multistage ultra-short pulse laser substep compressibility, comprises ultrashort laser pulse reflector 1, one-level compression set 14 and two-stage compression device 15; Wherein, one-level compression set 14 is arranged on the emitting light path of ultrashort laser pulse reflector 1; Wherein, two-stage compression device 15 is arranged on the optical diffraction of one-level compression set 14; Angle between the optical diffraction of the emitting light path of ultrashort laser pulse reflector 1 and one-level compression set 14 is θ; The span of θ is 6 ° of 0 ° of < θ <;
Furtherly, one-level compression set 14 comprises the pulse stretcher 2, prime amplifier, dispersion compensating element 6, the first collimating lens 10, the one-level body chirp grating 8 that set gradually along ultrashort laser pulse reflector 1 emitting light path;
Furtherly, two-stage compression device 15 comprises the condenser lens 9, main amplifier 11, the second collimating lens 12 and the secondary body chirp grating 13 that set gradually along one-level compression set 14 optical diffractions.
Wherein, pulse stretcher 2 is made up of chirped fiber grating 3 and optical circulator 4, and optical circulator 4 is provided with three ports and is connected with chirped fiber grating 3, ultrashort laser pulse reflector 1 and prime amplifier respectively.
Prime amplifier comprises one-level amplifier 5, two-stage amplifier 7 and connects the dispersion compensating element 6 of one-level amplifier 5 and two-stage amplifier 7.
Furtherly, above-mentioned one-level amplifier 5 is monomode fiber amplifier; Two-stage amplifier 7 is made up of pump combiner and Double Cladding Ytterbium Doped Fiber; Dispersion compensating element 6 is silica fiber;
Inventor provides multistage ultra-short pulse laser substep compressibility as shown in Figure 1, and in this system, ultrashort laser pulse reflector 1 adopts mode locked fiber laser, and main amplifier 11 adopts Yb:YAG Solid State Laser amplification module; Carry out following test by this system:
The original pulse of this 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.The laser pulse of launching is directly transported to pulse stretcher by the mode of fused fiber splice.
Pulse energy in order to ensure output meets instructions for use, and the prime amplifier in this system comprises dual-stage amplifier; One-level amplifier 5 is monomode fiber amplifiers, by wavelength division multiplexer with mix ytterbium monomode fiber and form; Two-stage amplifier 7 is made up of pump combiner and Double Cladding Ytterbium Doped Fiber;
Between pulse stretcher 2 and one-level amplifier 5, between one-level amplifier 5 and two-stage amplifier 7, between two-stage amplifier 7 and the first collimating lens 10 all by dispersion compensating element 6(silica fiber) connect, silica fiber uses and not only can carry out broadening to laser pulse at this place, also can regulate the dispersion measure of laser pulse by the length of adjusting silica fiber simultaneously.
The prime amplifier of above two-stage fiber amplifier construction system, under the pump power of several watts, prime amplifier output average light power reaches hundreds of milliwatts.Laser after pre-amplification is by the first collimating lens 10, the about 3mm of collimated light spot diameter, incide the plane of incidence of one-level body chirp grating 8, approximately 0 °～3 ° of the normal of this plane of incidence and the angles of incident beam, make through one-level body chirp grating 8 diffraction light beam out to be different from the direction output of optical path of incident light.The width that detects the light pulse after one-level body chirp grating 8 compression by autocorrelation function analyzer in use is about 450ps, has compressed about 250ps.Pulse dump energy 60% after precommpression, meets the requirement of follow-up amplifier to signal light intensity.
Afterwards, width is that 450ps pulse is coupled into Yb:YAG Solid State Laser amplification module via the condenser lens 9 of focal length 50mm, this module is as the main amplifier 11 of system, is amplified to experiment desired value, approximately 70 micro-Jiao by compressing for the first time the pulse energy that rear energy reduces slightly.This amplifying laser pulse after the second collimating lens 12 of 40mm focal length according to inciding in secondary body chirp grating 13 as one-level body chirp grating 8 same angles, the light energy of compressor reducer output is measured as 42 micro-Jiao, compression efficiency 60%, compressed pulse widths is through cutting system front end broadening silica fiber length to 142 meter, record compression afterpulse autocorrelator trace as Fig. 2, matching obtains pulsewidth 500fs.
Result based on obtaining in Fig. 2 has fully been verified and has been adopted the design feature of polylith body chirp grating, casacade multi-amplifier and dispersion compensating elements combination in native system, can realize the Efficient Compression of the stretched pulse to any pulsewidth.
Claims (5)
1. a multistage ultra-short pulse laser substep compressibility, is characterized in that: comprise ultrashort laser pulse reflector, one-level compression set and two-stage compression device; Described one-level compression set is arranged on the emitting light path of ultrashort laser pulse reflector; Described two-stage compression device is arranged on the optical diffraction of one-level compression set; Angle between the optical diffraction of the emitting light path of described ultrashort laser pulse reflector and one-level compression set is θ; The span of θ is 6 ° of 0 ° of < θ <;
Described one-level compression set comprises the pulse stretcher, prime amplifier, dispersion compensating element, the first collimating lens, the one-level body chirp grating that set gradually along ultrashort laser pulse reflector emitting light path;
Described two-stage compression device comprises the condenser lens, main amplifier, the second collimating lens and the secondary body chirp grating that set gradually along one-level compression set optical diffraction.
2. multistage ultra-short pulse laser substep compressibility according to claim 1, it is characterized in that: described pulse stretcher is made up of chirped fiber grating and optical circulator, described optical circulator is provided with three ports and is connected with chirped fiber grating, ultrashort laser pulse reflector and prime amplifier respectively.
3. multistage ultra-short pulse laser substep compressibility according to claim 1, is characterized in that: described prime amplifier comprises one-level amplifier, two-stage amplifier and connects the dispersion compensating element of one-level amplifier and two-stage amplifier.
4. multistage ultra-short pulse laser substep compressibility according to claim 3, is characterized in that: described one-level amplifier is monomode fiber amplifier; Described two-stage amplifier is made up of pump combiner and Double Cladding Ytterbium Doped Fiber.
5. according to the multistage ultra-short pulse laser substep compressibility described in the arbitrary claim of claim 1-4, it is characterized in that: described dispersion compensating element is silica fiber.
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Cited By (4)
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| CN104901152A (en) * | 2015-06-10 | 2015-09-09 | 广东量泽激光技术有限公司 | Novel femtosecond optical fiber amplifier |
| CN106451042A (en) * | 2016-10-14 | 2017-02-22 | 南方科技大学 | Chirped pulse amplification system for fiber laser |
| CN109478753A (en) * | 2016-07-13 | 2019-03-15 | 泰勒斯公司 | Compact high-average power compressor |
| WO2021248931A1 (en) * | 2020-06-12 | 2021-12-16 | 中国科学院上海光学精密机械研究所 | Ultra-intense chirped laser pulse stepwise compression device |
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| CN109478753A (en) * | 2016-07-13 | 2019-03-15 | 泰勒斯公司 | Compact high-average power compressor |
| CN106451042A (en) * | 2016-10-14 | 2017-02-22 | 南方科技大学 | Chirped pulse amplification system for fiber laser |
| WO2021248931A1 (en) * | 2020-06-12 | 2021-12-16 | 中国科学院上海光学精密机械研究所 | Ultra-intense chirped laser pulse stepwise compression device |
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Effective date of registration: 20190422 Address after: 311200 Hongxing Road 117, Xiaoshan economic and Technological Development Zone, Xiaoshan District, Hangzhou, Zhejiang Patentee after: Hangzhou Aochuang Photonics Technology Co., Ltd. Address before: 710119, No. 17, information Avenue, new industrial park, hi tech Zone, Shaanxi, Xi'an Patentee before: Xi-an Inst. of Optics and Fine Mechanics, Chinese Academy of Sciences |