CN100570461C - Chirp stretched laser pulse spectrum shaping device and method - Google Patents
Chirp stretched laser pulse spectrum shaping device and method Download PDFInfo
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- CN100570461C CN100570461C CNB2008100401143A CN200810040114A CN100570461C CN 100570461 C CN100570461 C CN 100570461C CN B2008100401143 A CNB2008100401143 A CN B2008100401143A CN 200810040114 A CN200810040114 A CN 200810040114A CN 100570461 C CN100570461 C CN 100570461C
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Abstract
The invention relates to a spectrum shaping device and a method for chirp broadening laser pulse, wherein the device comprises a mode-locked laser, a grating stretcher, a lens, a pulse sampler, an optical fiber beam splitter, an optical fiber amplifier, a synchronous photoelectric conversion device, a shaping electric pulse generator and an integrated waveguide conductive optical modulator. The device does not need complicated light path and mechanical device, changes the spectrum shape very conveniently, and the flexible operation, high efficiency is inserted into the chirp pulse multistage amplification system easily.
Description
Technical field
The present invention relates to chirped laser pulse, particularly a kind of chirp spread laser pulse light spectrum shaping device and method thereof.
Technical background
Chirped pulse amplification is usually used in producing terawatt (TW) even claps in watt ultrashort, super strong laser pulse experimental provision, and seed laser pulse carries out time explanation in stretcher, carry out multistage amplification again.Because the power density of the seed laser pulse behind the broadening is low excessively, amplification stage is divided into the pre-amplification of high-gain and two stages of power amplification usually.At the pre-amplification stage of high-gain,, make that the laser pulse behind final the amplification can't the original pulsewidth of compression and back because the laser pulse light spectrum that the gain narrowing effect of laser medium causes amplifying usually narrows.The pre-shaping technique of application of spectral can reduce the spectrum narrowing effect, thereby realizes the laser pulse output that pulsewidth is narrower, peak power density is bigger.In order to overcome the gain narrowing effect in the ultrashort laser pulse amplification process, people have proposed the method for several light spectrum reshapings, such as in light path, loading spike interference filter and quartzy birefringent filter, adopt reflection type grip pitch variable grating to realize the method for laser spectrum shaping, these methods have satisfied the needs of experiment to a certain extent, but also there are some problems, there are some spikes such as the spectrum after the shaping, it is more loaded down with trivial details to change spectral shape, the light path degree of regulation is required than higher, stability is bad, and device fabrication is difficulty etc. relatively.
Summary of the invention
The objective of the invention is to overcome the deficiency that above-mentioned prior art exists, a kind of chirp spread laser pulse light spectrum shaping device and method thereof are provided.This apparatus for shaping and method do not need complicated light path and mechanical hook-up, and it is very convenient to change spectral shape, flexible operation, and the efficient height is embedded into easily in the multistage amplification system of chirped pulse and goes.
The present invention is that ultimate principle is as follows:
Seed laser pulse is through grating stretching, be coupled in the single-mode fiber, choose single laser pulse through the integrated waveguide modulator that is loaded with an electric pulse, carry out the time shaping through the integrated waveguide modulator that is loaded with the shaping electric pulse again, thereby realize light spectrum reshaping.
If seed laser pulse electric field intensity is:
Behind the stretcher broadening:
In the formula:
φ ', φ " is respectively group delay, group velocity dispersion coefficient.
In the integrated waveguide modulator, carry out the time shaping:
ε (t) is the distribution function in time of laser pulse electric field intensity after the shaping.In the formula
In the formula: V
π, V
Pi/2Be respectively the half-wave voltage and 1/4th voltages of electrooptical modulation crystal, V (t) is a shaping electric pulse voltage, V
DcIt is dc offset voltage.
(3) formula is carried out Fourier transform can obtain the distribution of electric field intensity in frequency domain:
So the spectral shape of the laser pulse after the shaping is:
I(ω)∝|ε(ω)|
2 (6)
Technical solution of the present invention is as follows:
A kind of light spectrum shaping device of chirp spread laser pulse, its characteristics are: this device is by mode-locked laser, the grating stretching device, lens, pulse sample, fiber optic splitter, fiber amplifier, the synchronizable optical electrical switching device, shaping electric pulse generator and integrated waveguide electrooptic modulator constitute, its position relation is: the ultrashort laser pulse for the treatment of shaping of mode-locked laser output, through grating stretching device broadening, again through the input end of Lens Coupling to first single-mode fiber, the input end of the described pulse sample of output termination of this first single-mode fiber, the output terminal of this pulse sample connects described fiber optic splitter by second single-mode fiber, the input end of the described fiber amplifier of the first output termination of this fiber optic splitter, the output terminal of this fiber amplifier connects described synchronizable optical electrical switching device through the 5th single-mode fiber, the output terminal of this synchronizable optical electrical switching device connects described shaping electric pulse generator input end by first concentric cable, and the output terminal of this shaping electric pulse generator connects described integrated waveguide electrooptic modulator first input end by second concentric cable; Described fiber optic splitter second output terminal connects second input end of described integrated waveguide electrooptic modulator through the 3rd single-mode fiber, and by the output of the 4th single-mode fiber, spectrum has obtained shaping through shaping electric pulse modulation back in the ultrashort laser pulse for the treatment of shaping.
Above-mentioned chirp spread laser pulse light spectrum shaping device carries out the method for laser pulse light spectrum shaping, comprises the following steps:
1. the grating stretching device carries out chirp spread to the ultrashort seed laser pulse near the Fourier transform limit, makes the frequency interval and the linear corresponding relation of the time interval of laser pulse;
2. pulse sample is chosen only pulse to the high repetition frequency laser pulse sequence, makes the repetition frequency of the laser pulse behind the broadening be reduced to 1Hz;
3. use fiber optic splitter and carry out the laser pulse beam splitting, produce synchronous triggering electric pulse, promote the shaping electric pulse generator and produce the shaping electric pulse, make it and treat shaped laser pulses maintenance high level of synchronization by the synchronizable optical electrical switching device;
4. use the shaping electric pulse of shaping electric pulse generator generation and import described integrated waveguide electrooptic modulator, electric pulse shaping modulation is carried out in the ultrashort laser pulse for the treatment of shaping of importing second input end of described integrated waveguide electrooptic modulator through the 3rd single-mode fiber by described fiber optic splitter second output terminal, exported by the 4th single-mode fiber.
Technique effect of the present invention:
1, this light spectrum reshaping scheme can obtain smooth unmodulated shaping spectral waveform.
2, this light spectrum reshaping scheme does not have complicated light path, and laser pulse mainly transmits in optical fiber, and is easy to adjust, and stability is high.
3, this light spectrum reshaping scheme can change spectral waveform very easily, only needs to change the shaping electric pulse waveform.
4, laser pulse passes through broadening, chooses monopulse in this light spectrum reshaping scheme, therefore can very easily be embedded in the chirped laser pulse amplification system and go
Description of drawings
Fig. 1 is the structural representation of chirp spread laser pulse light spectrum shaping device of the present invention.
Fig. 2 is the shaping electric pulse waveform of three different modulating degree of depth.
Fig. 3 is the laser pulse light spectral shape after three different modulating degree of depth shaping electric pulses are modulated in the corresponding diagram 2.
Embodiment
The invention will be further described below in conjunction with embodiment and accompanying drawing, but should not limit protection scope of the present invention with this.
See also Fig. 1 earlier, Fig. 1 is the structural representation of chirp spread laser pulse light spectrum shaping device of the present invention.As seen from the figure, the light spectrum shaping device of chirp spread laser pulse of the present invention, by mode-locked laser 1, grating stretching device 2, lens 3, pulse sample 5, fiber optic splitter 6, fiber amplifier 7, synchronizable optical electrical switching device 8, shaping electric pulse generator 10 and integrated waveguide electrooptic modulator 11 constitute, its position relation is: the ultrashort laser pulse of described mode-locked laser 1 output, through grating stretching device 2 broadenings, be coupled to the input end of first single-mode fiber 41 again through lens 3, the input end of the output termination pulse sample 5 of this first single-mode fiber 41, the output terminal of this pulse sample 5 connects described fiber optic splitter 6 by second single-mode fiber 42, the input end of the described fiber amplifier 7 of the first output termination of this fiber optic splitter 6, the output terminal of this fiber amplifier 7 connects described synchronizable optical electrical switching device 8 through the 5th single-mode fiber 45, the output terminal of this synchronizable optical electrical switching device 8 connects described shaping electric pulse generator 10 input ends by first concentric cable 91, and the output terminal of this shaping electric pulse generator 10 connects described integrated waveguide electrooptic modulator 11 first input ends by second concentric cable 92; Described fiber optic splitter 6 second output terminals connect second input end of described integrated waveguide electrooptic modulator 11 through the 3rd single-mode fiber 43, the ultrashort laser pulse for the treatment of shaping is here through after the modulation of shaping electric pulse, by 44 outputs of the 4th single-mode fiber, spectrum has obtained shaping.
The process that described chirp spread laser pulse light spectrum shaping device carries out laser pulse light spectrum shaping comprises the following steps:
1. 2 pairs of ultrashort seed laser pulses near the Fourier transform limit by mode-locked laser 1 input of grating stretching device carry out chirp spread, make the frequency interval and the linear corresponding relation of the time interval of laser pulse;
2. the high repetition frequency laser pulse sequence of the chirp spread of 5 pairs of inputs of pulse sample is chosen monopulse, makes the repetition frequency of the laser pulse behind the broadening be reduced to 1Hz;
3. described fiber optic splitter 6 carries out the laser pulse beam splitting, and more weak light beam produces synchronous triggering electric pulse by synchronizable optical electrical switching device 8, promotes shaping electric pulse generator 10 and produces the shaping electric pulse, makes it and treat shaped laser pulses maintenance high level of synchronization;
4. use the shaping electric pulse of shaping electric pulse generator 10 generations and import described integrated waveguide electrooptic modulator 11, to carrying out electric pulse shaping modulation through the ultrashort laser pulse for the treatment of shaping of second input end of the described integrated waveguide electrooptic modulator 11 of the 3rd single-mode fiber 43 inputs, by 44 outputs of the 4th single-mode fiber by described fiber optic splitter 6 second output terminals.
For the ease of understanding the light spectrum reshaping scheme that the present invention proposes, with following embodiment this programme is described, and numerical evaluation the spectral waveform of shaping electric pulse waveform and shaping front and back:
1. mode-locked laser 1 is exported the seed laser pulse of 220fs, and the big overall with of spectrum half-shadow is 7.4nm.
2. pass through grating stretching device 2, seed laser pulse by linear broadening to 1.2ns.
3. scioptics 3 are coupled in the single-mode fiber.
4. be made of integrated waveguide modulator and 1Hz square-wave pulse generator sampler 5, choose monopulse, laser pulse frequency is reduced to 1Hz.
5. laser pulse imports to fiber optic splitter 6 by single-mode fiber, laser pulse is divided into two bundles, more weak a branch of process fiber amplifier 7 amplifies, the photoelectric conversion device 8 that desynchronizes then produces the synchronous triggering electric pulse, removes to trigger shaping electric pulse generator 10 with this electric pulse and produces the shaping electric pulse.
6. the stronger beam of laser pulse of exporting by fiber optic splitter 6, delay time through the 3rd single-mode fiber 43, be directed to integrated waveguide electrooptic modulator 11 simultaneously with the shaping electric pulse, laser pulse is through electrooptical modulation, on time by shaping, because the linear chrip laser pulse frequency interval and the time interval is linear corresponding, the spectral waveform and the time waveform of the laser pulse after the shaping are same.
Shaping electric pulse voltage waveform as shown in Figure 2 distributes in time.Fig. 3 is corresponding spectral shape, and the corresponding laser pulse of solid line is the spectrum during shaping not.The spectrum of laser pulse is through after the shaping among Fig. 3, and after tested, not only waveform becomes this shape of superelevation of flat-top by Gauss's shape, even the centre can present depression, and the complete works of wide degree of spectrum half-shadow has been widened 1～4nm before than shaping.
Claims (2)
1, a kind of light spectrum shaping device of chirp spread laser pulse, it is characterized in that: this device is by mode-locked laser (1), grating stretching device (2), lens (3), pulse sample (5), fiber optic splitter (6), fiber amplifier (7), synchronizable optical electrical switching device (8), shaping electric pulse generator (10) and integrated waveguide electrooptic modulator (11) constitute, its position relation is: the ultrashort laser pulse of mode-locked laser (1) output, through grating stretching device (2) broadening, be coupled to the input end of first single-mode fiber (41) through lens (3) again, the input end of the output termination pulse sample (5) of this first single-mode fiber (41), the output terminal of this pulse sample (5) connects described fiber optic splitter (6) by second single-mode fiber (42), the input end of the first output described fiber amplifier of termination (7) of this fiber optic splitter (6), the output terminal of this fiber amplifier (7) connects described synchronizable optical electrical switching device (8) through the 5th single-mode fiber (45), the output terminal of this synchronizable optical electrical switching device (8) connects described shaping electric pulse generator (10) input end by first concentric cable (91), and the output terminal of this shaping electric pulse generator (10) connects described integrated waveguide electrooptic modulator (11) first input end by second concentric cable (92); Described fiber optic splitter (6) second output terminals connect second input end of described integrated waveguide electrooptic modulator (11) through the 3rd single-mode fiber (43), the ultrashort laser pulse process shaping electric pulse modulation back for the treatment of shaping is by the 4th single-mode fiber (44) output, and spectrum has obtained shaping.
2, the described chirp spread laser pulse light spectrum shaping device of claim 1 carries out the method for laser pulse light spectrum shaping, it is characterized in that comprising the following steps:
1. grating stretching device (2) carries out chirp spread to the ultrashort seed laser pulse near the Fourier transform limit of mode-locked laser (1) input, makes the frequency interval and the linear corresponding relation of the time interval of laser pulse;
2. pulse sample (5) is chosen monopulse to the high repetition frequency laser pulse sequence of chirp spread, makes the repetition frequency of the laser pulse behind the broadening be reduced to 1Hz;
3. use fiber optic splitter (6) and carry out the laser pulse beam splitting, more weak beam of laser promotes shaping electric pulse generator (10) by synchronizable optical electrical switching device (8) and produces the shaping electric pulse, makes it and treat shaped laser pulses maintenance high level of synchronization;
4. use the shaping electric pulse of shaping electric pulse generator (10) generation and import described integrated waveguide electrooptic modulator (11), to carrying out electric pulse shaping modulation through the ultrashort laser pulse for the treatment of shaping of second input end of the 3rd single-mode fiber (43) the described integrated waveguide electrooptic modulator of input (11), export by the 4th single-mode fiber (44) by described fiber optic splitter (6) second output terminals.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107910736A (en) * | 2017-12-19 | 2018-04-13 | 成都师范学院 | Increase the chirped laser pulse frequency spectrum shaping system of Dare interferometer based on Mach |
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| US8279901B2 (en) * | 2010-02-24 | 2012-10-02 | Alcon Lensx, Inc. | High power femtosecond laser with adjustable repetition rate and simplified structure |
| CN101881919A (en) * | 2010-06-02 | 2010-11-10 | 苏州大学 | Optical fiber chirped pulse amplifier for ultra-short laser pulse output |
| CN103001107B (en) * | 2012-12-13 | 2014-08-13 | 中国科学院上海光学精密机械研究所 | Multi-pass chirped fiber grating pulse broadening device |
| CN104158075B (en) * | 2014-08-05 | 2017-01-25 | 中国空间技术研究院 | Super Gaussian pulse generation method and device on basis of gain reshaping |
| CN108628057B (en) * | 2018-05-11 | 2020-05-08 | 电子科技大学 | Multi-level optical pulse shaping device |
| CN109616860A (en) * | 2019-02-12 | 2019-04-12 | 北京交通大学 | A kind of fiber amplifier |
| 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 |
| CN111711052B (en) * | 2020-06-04 | 2021-09-07 | 中国科学院上海光学精密机械研究所 | Chirped pulse spectrum shaping device and method based on electro-optic modulation |
| CN113451865A (en) * | 2021-06-01 | 2021-09-28 | 中国原子能科学研究院 | Chirped pulse spectrum shaping device and method based on three-wavelength multi-order wave plate |
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| CN1233867A (en) * | 1998-04-29 | 1999-11-03 | 中国科学院福建物质结构研究所 | Optical synchronous and self-locking-mode laser and chirp pulse amplification system thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107910736A (en) * | 2017-12-19 | 2018-04-13 | 成都师范学院 | Increase the chirped laser pulse frequency spectrum shaping system of Dare interferometer based on Mach |
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