CN103779780B - Multistage ultrashort pulse laser step-by-step compression system - Google Patents
Multistage ultrashort pulse laser step-by-step compression system Download PDFInfo
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- CN103779780B CN103779780B CN201310745794.XA CN201310745794A CN103779780B CN 103779780 B CN103779780 B CN 103779780B CN 201310745794 A CN201310745794 A CN 201310745794A CN 103779780 B CN103779780 B CN 103779780B
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- 238000007906 compression Methods 0.000 title claims abstract description 51
- 230000006835 compression Effects 0.000 title claims abstract description 51
- 239000006185 dispersion Substances 0.000 claims abstract description 20
- 239000000835 fiber Substances 0.000 claims description 33
- 230000003287 optical effect Effects 0.000 claims description 24
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical group O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 14
- 239000013307 optical fiber Substances 0.000 claims description 7
- 239000000377 silicon dioxide Substances 0.000 claims description 7
- 229910052769 Ytterbium Inorganic materials 0.000 claims description 5
- NAWDYIZEMPQZHO-UHFFFAOYSA-N ytterbium Chemical compound [Yb] NAWDYIZEMPQZHO-UHFFFAOYSA-N 0.000 claims description 5
- 238000005253 cladding Methods 0.000 claims description 4
- 210000001367 artery Anatomy 0.000 claims 1
- 238000009738 saturating Methods 0.000 claims 1
- 210000003462 vein Anatomy 0.000 claims 1
- 230000003321 amplification Effects 0.000 description 9
- 238000003199 nucleic acid amplification method Methods 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000005311 autocorrelation function Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013144 data compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
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Abstract
The invention belongs to the field of optics, and particularly relates to a multistage ultrashort pulse laser step-by-step compression system. The system comprises an ultra-short laser pulse emitter, a primary compression device and a secondary compression device; the primary compression device comprises a pulse stretcher, a preamplifier, a dispersion compensation element, a first collimating lens and a primary chirped grating which are sequentially arranged along an emergent light path of the ultra-short laser pulse transmitter; the secondary compression device comprises a focusing lens, a main amplifier, a second collimating lens and a secondary volume chirped grating which are sequentially arranged along the diffraction light path of the primary compression device; the system utilizes a plurality of block gratings to realize the step-by-step compression of laser pulses with any broadening quantity, and simultaneously greatly reduces the compression loss of finally outputting 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 typically combined chirped pulse amplification by multi-stage laser amplifier and obtains.This chirped pulse amplification route includes the generation of laser pulse, the broadening of pulse, pulse energy is amplified and the compression of pulse, wherein this link of pulse amplifying includes multiple amplification branch, these branch's serial substeps, in the links of this technology path, play the effect the most gradually amplified laser pulse.And broadening link and the last compression link in route is two covering devices front and back echoed, the former realizes, to pulse stretching in time, producing 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 the diffraction optical element with relatively large dispersion.The way that chirped pulse amplification system is the most generally taked be use diffraction grating to or chirped fiber grating as pulse stretcher, this dispersion management element utilizes the angle of diffraction of light field or the not equivalent feature of diffraction precedence to different wave length to realize the delay in time of pulse different wave length.Corresponding pulse shortener is due to the superlaser after amplification to be born, the grating of optical fiber structure cannot be used again to realize, traditional way is to use reflective diffraction gratings or transmissive diffraction grating that laser beam is carried out delay spatially, it is achieved dispersion compensation.But the space optical path structure of this multiple components and parts composition is sensitive to beam incident angle, to vibration sensing, and regulation process is extremely difficult to, because of rather than the compression device of a kind of applicable industrial quarters complex environment use.Development in recent years has been got up this diffraction optical element of body chirp grating, and it is a kind of solid transparent device, and bigger clear aperature can be had to accept superlaser, has chromatic dispersion compensating function simultaneously, and using method is simple, easily debugs.
Body chirp grating is the device of fixing dispersion measure, the pulse compression amount that it can provide just immobilizes after grating is produced, and the time explanation (compression) that body grating is currently available measures limited, it is usually no more than 500ps, so for wider stretched pulse (> 500ps), must use multiple body gratings that it is compressed.But each body grating has certain diffraction loss and absorbed loss (loss amounts to about 40%) to inciding light therein, if using multiple body grating, the overall loss of compressor can the double increase along with the increase of body grating quantity, this is greatly lowered 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 of utilizes polylith body grating to achieve the laser pulse to any broadening amount to carry out substep and compress, be greatly reduced the multistage ultra-short pulse laser substep compressibility of the compression loss amount of final output superlaser simultaneously.
The concrete technical scheme of the present invention is:
A kind of multistage ultra-short pulse laser substep compressibility, it is characterised in that: include ultrashort laser pulse emitter, one stage of compression device and two-stage compression device；Described one stage of compression device is arranged on the emitting light path of ultrashort laser pulse emitter；Described two-stage compression device is arranged on the optical diffraction of one stage of compression device；Angle between emitting light path and the optical diffraction of one stage of compression device of described ultrashort laser pulse emitter is θ；The span of θ is 0 ° of ＜ θ ＜ 6 °；
Pulse stretcher that described one stage of compression device includes setting gradually along ultrashort laser pulse emitter emitting light path, prime amplifier, dispersion compensating element, the first collimating lens, one-level body chirp grating；
Described two-stage compression device includes condenser lens, main amplifier, the second collimating lens and the two grades of body chirp gratings set gradually along one stage of compression device 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 emitter and prime amplifier respectively.
Above-mentioned prime amplifier includes first stage amplifier, two-stage amplifier and connects first stage amplifier and the dispersion compensating element of two-stage amplifier.
Above-mentioned first stage amplifier is single-mode optical 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 fibre.
It is an advantage of the current invention that:
1, the present invention uses many individual chirp grating classifications to be compressed laser pulse, greatly reduces the final compression loss amount exporting superlaser.
2, in the present invention, prime amplifier uses two-stage fiber amplifier, it is ensured that the energy of system energy output laser pulse.
3, the present invention uses dispersion compensating element, it is ensured that the pulse stretching amount of system and decrement are mated completely.
4, in the present invention, angle between the input path and emitting light path of body chirp grating is between 0 °～6 °, it is ensured that chirp grating diffraction light beam out exports with the direction being different from input path.
Accompanying drawing explanation
Fig. 1 is the system structure schematic diagram of the present invention.
Fig. 2 uses the laser pulse autocorrelator trace oscillogram after the substep compression of two-stage body grating.
Reference is as follows:
1-ultrashort laser emitter, 2-pulse stretcher, 3-chirped fiber grating, 4-optical circulator, 5-first stage 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, bis-grades of body chirp gratings of 13-.
Detailed description of the invention
The present invention proposes building of the ultra-short pulse laser substep compressibility of a kind of efficient, high integration based on body chirp grating, demonstrates many blocks chirp grating and realizes the stretched pulse of any pulsewidth is carried out Efficient Compression.
Hereinafter describe the present invention:
A kind of multistage ultra-short pulse laser substep compressibility, including ultrashort laser pulse emitter 1, one stage of compression device 14 and two-stage compression device 15；Wherein, one stage of compression device 14 is arranged on the emitting light path of ultrashort laser pulse emitter 1；Wherein, two-stage compression device 15 is arranged on the optical diffraction of one stage of compression device 14；Angle between emitting light path and the optical diffraction of one stage of compression device 14 of ultrashort laser pulse emitter 1 is θ；The span of θ is 0 ° of ＜ θ ＜ 6 °；
Furtherly, one stage of compression device 14 includes setting gradually along ultrashort laser pulse emitter 1 emitting light path pulse stretcher 2, prime amplifier, dispersion compensating element the 6, first collimating lens 10, one-level body chirp grating 8；
Furtherly, two-stage compression device 15 includes condenser lens 9, main amplifier the 11, second collimating lens 12 and the two grades of body chirp gratings 13 set gradually along one stage of compression device 14 optical diffraction.
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 emitter 1 and prime amplifier respectively.
Prime amplifier includes first stage amplifier 5, two-stage amplifier 7 and connects first stage amplifier 5 and the dispersion compensating element 6 of two-stage amplifier 7.
Furtherly, above-mentioned first stage amplifier 5 is single-mode optical fiber amplifier；Two-stage amplifier 7 is made up of pump combiner and Double Cladding Ytterbium Doped Fiber；Dispersion compensating element 6 is silica fibre；
Inventor providing multistage ultra-short pulse laser substep compressibility as shown in Figure 1, in this system, ultrashort laser pulse emitter 1 uses mode locked fiber laser, main amplifier 11 to use Yb:YAG Solid State Laser amplification module；By the system have been tests below:
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 laser repetition rate 50MHz of outfan tail optical fiber output, pulsewidth about 400fs, centre wavelength 1053nm, mean power 1mw.The laser pulse launched directly is transported to pulse stretcher by the way of fused fiber splice.
Pulse stretcher 2 is made up of chirped fiber grating 3 and optical circulator 4, chirped fiber grating 3 is reflective gratings, it is welded together use with optical circulator 4, optical circulator 4 has three ports, A end connects the port of ultrashort laser pulse emitter 1 (mode locked fiber laser), receives the optical signal from ultrashort laser pulse emitter 1 (mode locked fiber laser)；B end is the port connecting chirped fiber grating 3, receives the reflection light from chirped fiber grating 3；C end is reflection light output end, namely the pulse after broadening is exported.Light impulse length after broadening reaches about 700ps, but energy is relatively low, will carry out the lifting of energy through fiber amplifier.Therefore, have employed prime amplifier in the present system the energy of pulse is amplified；
Pulse energy in order to ensure output meets use requirement, and the prime amplifier in this system includes dual-stage amplifier；First stage amplifier 5 is single-mode optical fiber amplifier, by wavelength division multiplexer with mix ytterbium single-mode fiber and form；Two-stage amplifier 7 is made up of pump combiner and Double Cladding Ytterbium Doped Fiber；
All by dispersion compensating element 6(silica fibre between pulse stretcher 2 and first stage amplifier 5, between first stage amplifier 5 and two-stage amplifier 7, between two-stage amplifier 7 and the first collimating lens 10) connect, silica fibre uses in this place and is possible not only to carry out laser pulse broadening, can also be adjusted the dispersion measure of laser pulse by the length adjusting silica fibre simultaneously.
Above two-stage fiber amplifier constitutes the prime amplifier of system, and under the pump power of several watts, prime amplifier output average light power reaches hundreds of milliwatt.Laser after pre-amplification passes through the first collimating lens 10, collimated light spot diameter about 3mm, incide the plane of incidence of one-level body chirp grating 8, the normal of this plane of incidence and the angle of incident beam about 0 °～3 ° so that export with the direction being different from optical path of incident light through one-level body chirp grating 8 diffraction light beam out.Use and be about 450ps by the autocorrelation function analyzer detection width of light pulse after one-level body chirp grating 8 compresses, i.e. have compressed about 250ps.Pulse dump energy 60% after precommpression, meets the subsequent amplifier requirement 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, and the pulse energy that energy after first-time compression is slightly reduced, as the main amplifier 11 of system, is amplified to test desired value, about 70 micro-Jiao by this module.This amplification laser pulse incides in two grades of body chirp gratings 13 according to angle as same in one-level body chirp grating 8 after the second collimating lens 12 of 40mm focal length, the light energy of compressor output is measured as 42 micro-Jiao, compression efficiency 60%, compressed pulse widths through cutting system front end broadening silica fibre length to 142 meters, recording compression afterpulse autocorrelator trace such as Fig. 2, matching obtains pulsewidth 500fs.
Fully demonstrate based on the result obtained in Fig. 2 and have employed many blocks chirp grating in native system, multistage amplifier and the construction features of dispersion compensating element combination, it is possible to achieve the Efficient Compression to the stretched pulse of any pulsewidth.
Claims (5)
1. a multistage ultra-short pulse laser substep compressibility, it is characterised in that: include ultrashort laser
Impulse sender, one stage of compression device and two-stage compression device；Described one stage of compression device is arranged on
On the emitting light path of ultrashort laser pulse emitter；Described two-stage compression device is arranged on one stage of compression dress
On the optical diffraction put；The emitting light path of described ultrashort laser pulse emitter and one stage of compression device
Angle between optical diffraction is θ；The span of θ is 0 ° of ＜ θ ＜ 6 °；
Described one stage of compression device includes the arteries and veins set gradually along ultrashort laser pulse emitter emitting light path
Rush stretcher, prime amplifier, dispersion compensating element, the first collimating lens, one-level body chirp grating；
Described two-stage compression device includes that the focusing set gradually along one stage of compression device optical diffraction is saturating
Mirror, main amplifier, the second collimating lens and two grades of body chirp gratings.
Multistage ultra-short pulse laser the most according to claim 1 substep compressibility, its feature exists
In: described pulse stretcher is made up of chirped fiber grating and optical circulator, and described optical circulator sets
It is equipped with three ports respectively with chirped fiber grating, ultrashort laser pulse emitter and prime amplifier even
Connect.
Multistage ultra-short pulse laser the most according to claim 1 substep compressibility, its feature exists
In: described prime amplifier includes first stage amplifier, two-stage amplifier and connects first stage amplifier and two
The dispersion compensating element of level amplifier.
Multistage ultra-short pulse laser the most according to claim 3 substep compressibility, its feature exists
In: described first stage amplifier is single-mode optical fiber amplifier；Described two-stage amplifier is by pump combiner
Form with Double Cladding Ytterbium Doped Fiber.
5. according to the multistage ultra-short pulse laser substep compression described in claim 1-4 any claim
System, it is characterised in that: described dispersion compensating element is silica fibre.
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| CN104901152B (en) * | 2015-06-10 | 2018-08-03 | 广东量泽激光技术有限公司 | A kind of novel femtosecond fiber amplifier |
| FR3054082B1 (en) * | 2016-07-13 | 2019-03-15 | Thales | COMPACT COMPACTOR WITH HIGH AVERAGE POWER |
| CN106451042A (en) * | 2016-10-14 | 2017-02-22 | 南方科技大学 | Chirped pulse amplification system for fiber laser |
| CN111600190B (en) * | 2020-06-12 | 2023-01-20 | 中国科学院上海光学精密机械研究所 | Super-strong chirp laser pulse step-by-step compression device |
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| CN1098550C (en) * | 1999-07-12 | 2003-01-08 | 中国科学院西安光学精密机械研究所 | Annular cavity fiber laser |
| EP1675227A1 (en) * | 2004-12-08 | 2006-06-28 | PolarOnyx , Inc. | Nonlinear polarization pulse mode locked fiber laser at a wavelength of one micron |
| CN100442134C (en) * | 2006-08-22 | 2008-12-10 | 中国科学院上海光学精密机械研究所 | Femtosecond pulse compression device |
| US7903326B2 (en) * | 2007-11-30 | 2011-03-08 | Radiance, Inc. | Static phase mask for high-order spectral phase control in a hybrid chirped pulse amplifier system |
| US8238386B2 (en) * | 2010-05-21 | 2012-08-07 | Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V. | Pulsed light source |
| US8537866B2 (en) * | 2011-05-20 | 2013-09-17 | Calmar Optcom, Inc. | Generating laser pulses of narrow spectral linewidth based on chirping and stretching of laser pulses and subsequent power amplification |
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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 INSTITUTE OF OPTICS AND PRECISION MECHANICS OF CAS |