CN104577690B - Ultra wide band optics coherence tomography Chirp pulse amplification laser system - Google Patents
Ultra wide band optics coherence tomography Chirp pulse amplification laser system Download PDFInfo
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Abstract
Ultra wide band optics coherence tomography Chirp pulse amplification laser system, the system includes ultra wide band seed source, pulse stretching compression and spectrum beam splitting and closes Shu Danyuan, optically erasing unit, speculum and catadioptric mirror, Shu Danyuan is closed in described pulse stretching compression and spectrum beam splitting includes one piece high dispersion transmission flat board and eight pieces of diffraction rib grid, and described optically erasing unit includes the photoparametric amplifier of three different gains bandwidth.The present invention can carry out plus and blowup to ultra wide band laser pulse, it is to avoid Gain-narrowing effect, nonlinear effect and gain media damage, can produce joule level monocycle laser pulse.
Description
Technical field
The present invention relates to laser field, more particularly to a kind of ultra wide band optics coherence tomography Chirp pulse amplification laser system, its
It is primarily adapted for use in ultra wide band laser system, optics coherence tomography laser system, monocycle laser system, joule level high energy monocycle laser
System.
Background technology
High-energy monocycle (~3fs) laser pulse is one of forefront of current international laser technical research.2009
Gunther Krauss etc. are by two-way is homologous but femtosecond fiber Laser coherent combining of different-waveband generates that to receive joule 4.3fs mono-
Periodic laser pulse (Gunther Krauss, et.al.Synthesis of a single cycle of light with
compact erbium-doped fibre technology,Nature photonics,Vol 4,pp33,2010.)。2011
Year Shu-Wei Huang etc. is homologous but optically erasing Laser coherent combining of different-waveband generates the 15uJ monocycles by two-way
Interior laser pulse (Shu-Wei Huang, et.al.High-energy pulse synthesis with sub-cycle
waveform control for strong-field physics,Nature photonics,Vol 5,pp 475,
2011.).Although above two method achieves monocycle laser pulse, single pulse energy very little, main cause includes:
1. above two method is to carry out high power arteries and veins in optics coherence tomography, therefore transmission medium to transfer limit short pulse
The nonlinear effect and dielectric damages threshold restriction of punching composite pulse energy lift;
2. above two method is that the optics coherence tomography of two pulses is realized using double color plate, therefore high power transmitted light
Nonlinear effect and double color plate damage threshold limit composite pulse energy lift.
The enterprising line frequency domain subrane of Fourier plane in the 4f systems based on grating such as Bruno E.Schmidt in 2013
Optically erasing avoids Gain-narrowing effect, simultaneously because Fourier transform limited pulses broadening improves the pulse of amplification
Energy, generates 1.43mJ binary cycles laser pulse (Bruno E.Schmidt, et.al.Frequency domain
optical parametric amplification,Nature communications,ncomms4643,2014.).The party
Although method by the energy lift of cycle stage laser pulse to millijoule level, be difficult be promoted to again joule, several joules, even
Tens of joules of levels.Main cause is amplified for this method in Fourier plane to different frequency band pulse, per band frequency
The limited bandwidth of wave band avoids the gain narrowing of amplification medium, while the time pulsewidth of broadening reduces nonlinear effect, carried
High damage threshold.But if the bandwidth further reduced per band frequency wave band needs very highdensity grating, and it is very big
The concave mirror of bore and very long-focus, thus system scale will be extremely huge and become infeasible.
The content of the invention
It is an object of the invention to overcome the shortcomings of that above-mentioned prior art is present, it is proposed that a kind of ultra wide band optics coherence tomography Zhou
Sing pulse amplifying laser system.The system can carry out plus and blowup to ultra wide band laser pulse, it is to avoid Gain-narrowing effect,
Nonlinear effect and gain media damage, can produce joule level monocycle laser pulse.
In order to reach foregoing invention purpose, technical scheme is as follows:
A kind of ultra wide band optics coherence tomography Chirp pulse amplification laser system, its feature is that the system includes ultra wide band kind
Shu Danyuan, optically erasing unit, speculum and catadioptric mirror, described pulse are closed in component, pulse stretching compression and spectrum beam splitting
Shu Danyuan is closed in chirped and spectrum beam splitting includes one piece high dispersion transmission flat board and eight pieces of diffraction rib grid:First diffraction rib grid,
Second diffraction rib grid, the 3rd diffraction rib grid, the 4th diffraction rib grid, the 5th diffraction rib grid, the 6th diffraction rib grid, the 7th diffraction rib grid
With the 8th diffraction rib grid, described optically erasing unit includes the photoparametric amplifier of three different gains bandwidth:First light
Parameter amplifier, the second photoparametric amplifier and the 3rd photoparametric amplifier, the position relationship of above-mentioned component are as follows:
The flashlight of described ultra wide band seed source output enters pulse stretching compression and Shu Danyuan is closed in spectrum beam splitting:Through
Light beam is scattered generation space chirp based on spectrum in space after one diffraction rib grid and the second diffraction rib grid diffraction, saturating through high dispersion
Penetrate after flat board and be divided into high frequency band light beam, mf band light beam and low-frequency band light beam:
Described high frequency band light beam eliminates space chirp through the 3rd diffraction rib grid and the 4th diffraction rib grid diffraction, through first
Speculum is reflected into the first photoparametric amplifier, and the ideler frequency light after amplification is turned back through the first catadioptric mirror and changes height and position,
Through the reflection of the second speculum again through the 4th diffraction rib grid and the 3rd diffraction rib grid diffraction, through the transmission of high dispersion transmission flat board, warp
Second diffraction rib grid and the output of the first diffraction rib grid diffraction;
Described mf band light beam eliminates space chirp through the 5th diffraction rib grid and the 6th diffraction rib grid diffraction, through the 3rd
Speculum is reflected into the second photoparametric amplifier, and the ideler frequency light after amplification is turned back through the second catadioptric mirror and changes height and position,
Through the reflection of the 4th speculum through the 6th diffraction rib grid and the 5th diffraction rib grid diffraction, through high dispersion transmission flat board transmission, through second
Diffraction rib grid and the output of the first diffraction rib grid diffraction;
Described low-frequency band light beam eliminates space chirp through the 7th diffraction rib grid and the 8th diffraction rib grid diffraction, through the 5th
Speculum is reflected into the 3rd photoparametric amplifier, and the ideler frequency light after amplification is turned back through the 3rd catadioptric mirror and changes height and position,
Reflected through the 6th speculum, through the 8th diffraction rib grid and the 7th diffraction rib grid diffraction, through high dispersion transmission flat board transmission, through second
Diffraction rib grid and the output of the first diffraction rib grid diffraction.
It is parallel with the second diffraction rib grid that the first diffraction rib grid in Shu Danyuan are closed in described pulse stretching compression and spectrum beam splitting,
3rd diffraction rib grid, the 4th diffraction rib grid, the 5th diffraction rib grid, the 6th diffraction rib grid, the 7th diffraction rib grid and the 8th diffraction rib
Grid are parallel to each other, the first diffraction rib grid, the second diffraction rib grid and the 3rd diffraction rib grid, the 4th diffraction rib grid, the 5th diffraction rib grid,
6th diffraction rib grid, the 7th diffraction rib grid are antiparallel on high dispersion transmission flat board mirror image with the 8th diffraction rib grid.
Described pulse stretching compression and spectrum beam splitting close the 2nd order chromatic dispersion that Shu Danyuan introduces be bear, third-order dispersion is zero.
The first photoparametric amplifier, the second photoparametric amplifier and the 3rd optical parameter are put in described optically erasing unit
The gain bandwidth of big device is different, and high frequency band light beam, mf band light beam and low-frequency band light beam are amplified respectively.
Described first turn back mirror, second turn back mirror and the 3rd mirror of turning back is respectively provided with along the translational adjustment of optical path direction of turning back
Mechanism, realizes the delay adjustment of optics coherence tomography.
Shu Danyuan is closed in described pulse stretching compression and spectrum beam splitting, is realized for the flashlight before optically erasing unit
Time explanation based on chirp and the space beam splitting based on spectrum, realize for the ideler frequency light after optically erasing unit and are based on
Beam is closed in the time compression of chirp and the space based on spectrum.
The technique effect of the present invention is as follows:
Ultra wide band optics coherence tomography Chirp pulse amplification laser system of the present invention, in first passage pulse stretching compression and spectrum
Beam splitting is closed in Shu Danyuan, and flashlight is scattered after the first diffraction rib grid and the second diffraction rib grid based on spectrum in space, is passed through
After high dispersion transmission flat board by the 3rd diffraction rib grid and the 4th diffraction rib grid, the 5th diffraction rib grid and the 6th diffraction rib grid and
7th diffraction rib grid and the 8th diffraction rib grid are divided into high frequency band light beam, mf band light beam and low-frequency band light beam, completely
The space beam splitting based on spectrum is realized while compensation space chirp.In addition, should during flashlight be introduced into second order it is negative when
Between chirp realize the time explanation of pulse.
In optically erasing unit, high frequency band light beam, mf band light beam and low-frequency band light beam are respectively by first
Photoparametric amplifier, the second photoparametric amplifier and the amplification of the 3rd photoparametric amplifier subrane, so as to avoid gain narrowing
Effect.What it is due to amplification is time explanation pulse, so as to avoid nonlinear effect and gain media damage.Optically erasing list
The ideler frequency light of member output amplification has the time chirp opposite with flashlight, it is achieved thereby that time chirp reversion, i.e. ideler frequency light
With positive time chirp.
In Shu Danyuan is closed again by pulse stretching compression and spectrum beam splitting, high frequency band light beam ideler frequency light, intermediate wave
Section light beam ideler frequency light and low-frequency band light beam ideler frequency light are respectively by the 4th diffraction rib grid and the 3rd diffraction rib grid, the 6th diffraction
After rib grid and the 5th diffraction rib grid and the 8th diffraction rib grid and the 7th diffraction rib grid diffraction, transmitted through high dispersion after flat board
Through the second diffraction rib grid and the first diffraction rib grid diffraction, the space based on spectrum is realized while space chirp is fully compensated and is closed
Beam.In addition, should during ideler frequency light be introduced into second order bear time chirp realize pulse time compression.
The ultra wide band optics coherence tomography Chirp pulse amplification laser system of the present invention has following technology compared with prior art
Feature:
The present invention can carry out plus and blowup to ultra wide band laser pulse, it is to avoid Gain-narrowing effect, nonlinear effect
With gain media damage, joule level monocycle laser pulse can be produced.
Brief description of the drawings
Fig. 1 is ultra wide band optics coherence tomography Chirp pulse amplification laser system embodiment schematic diagram of the present invention.
Embodiment
Come that the present invention is further elaborated with reference to the accompanying drawings and examples, in the hope of being more fully apparent from geography
The structure composition situation and workflow of the present invention are solved, but the protection domain of patent of the present invention can not be limited with this.
Fig. 1 is ultra wide band optics coherence tomography Chirp pulse amplification laser system embodiment schematic diagram of the present invention, as seen from the figure, this
Invention include ultra wide band seed source 1, pulse stretching compression and spectrum beam splitting conjunction Shu Danyuan, optically erasing unit, speculum and
Shu Danyuan is closed in catadioptric mirror, described pulse stretching compression and spectrum beam splitting includes one piece high dispersion transmission flat board 4 and eight pieces of diffraction
Rib grid:First diffraction rib grid 2, the second diffraction rib grid 3, the 3rd diffraction rib grid 5, the 4th diffraction rib grid 6, the 5th diffraction rib grid 11,
6th diffraction rib grid 12, the 7th diffraction rib grid 17 and the 8th diffraction rib grid 18, described optically erasing unit include three not
With the photoparametric amplifier of gain bandwidth:First photoparametric amplifier 8, the second photoparametric amplifier 14 and the 3rd optically erasing
Device 20, the position relationship of above-mentioned component is as follows:
The output 600nm-1200nm ultra-broadband signals light of ultra wide band seed source 1 enters pulse stretching compression and spectrum beam splitting is closed
Shu Danyuan:Light beam is scattered based on spectrum in space after the first diffraction rib grid 2 and the diffraction of the second diffraction rib grid 3 produces space Zhou
Sing, be divided into 600nm-800nm high frequency bands light beam, 800nm-1000nm mf band light after transmiting flat board 4 through high dispersion
Beam and 1000nm-1200nm low-frequency band light beams:
600-800nm high frequency bands light beam eliminates space chirp through the 3rd diffraction rib grid 5 and the diffraction of the 4th diffraction rib grid 6,
The first photoparametric amplifier 8 is reflected into through the first speculum 7, the ideler frequency light after amplification is turned back and changed through the first catadioptric mirror 9
Height and position, is again introduced into pulse stretching compression through the reflection of the second speculum 10 and Shu Danyuan is closed in spectrum beam splitting:Through the 4th diffraction
The diffraction of rib grid 6, transmit, through the diffraction of the second diffraction rib grid 3, through the through the diffraction of the 3rd diffraction rib grid 5, through high dispersion transmission flat board 4
The diffraction of one diffraction rib grid 2 is exported.
800nm-1000nm mf bands light beam eliminates space through the 5th diffraction rib grid 11 and the diffraction of the 6th diffraction rib grid 12
Chirp, the second photoparametric amplifier 14 is reflected into through the 3rd speculum 13, and the ideler frequency light after amplification is through the second catadioptric folding of mirror 15
Return and change height and position, be again introduced into pulse stretching compression through the reflection of the 4th speculum 16 and Shu Danyuan is closed in spectrum beam splitting:Through
The diffraction of 6th diffraction rib grid 12, through the diffraction of the 5th diffraction rib grid 11, through high dispersion transmission flat board 4 transmit, through the second diffraction rib grid 3
Diffraction, through the diffraction of the first diffraction rib grid 2 export.
1000nm-1200nm low-frequency bands light beam eliminates space through the 7th diffraction rib grid 17 and the diffraction of the 8th diffraction rib grid 18
Chirp, the 3rd photoparametric amplifier 20 is reflected into through the 5th speculum 19, and the ideler frequency light after amplification is through the 3rd catadioptric folding of mirror 21
Return and change height and position, be again introduced into pulse stretching compression through the reflection of the 6th speculum 22 and Shu Danyuan is closed in spectrum beam splitting:Through
The diffraction of 8th diffraction rib grid 18, through the diffraction of the 7th diffraction rib grid 17, through high dispersion transmission flat board 4 transmit, through the second diffraction rib grid 3
Diffraction, through the diffraction of the first diffraction rib grid 2 export.
It is flat that the first diffraction rib grid 2 and the second diffraction rib grid 3 in Shu Danyuan are closed in described pulse stretching compression and spectrum beam splitting
OK, the 3rd diffraction rib grid 5, the 4th diffraction rib grid 6, the 5th diffraction rib grid 11, the 6th diffraction rib grid 12, the 7th diffraction rib grid 17 with
8th diffraction rib grid 18 are parallel to each other, first and second diffraction rib grid with third and fourth, five, six, seven, eight diffraction rib grid are on high dispersion
Transmit the mirror image of flat board 4 antiparallel.Described pulse stretching compression and spectrum beam splitting close 2nd order chromatic dispersion that Shu Danyuan introduces for it is negative, three
Rank dispersion is zero.
First photoparametric amplifier 8, the second photoparametric amplifier 14 and the 3rd beche-de-mer without spike in described optically erasing unit
The gain bandwidth for measuring amplifier 20 is different, and 600-800nm high frequency bands light beam, 800nm-1000nm mf band light are corresponded to respectively
Beam and 1000nm-1200nm low-frequency bands light beam complete energy amplification.
Described first turn back mirror 9, second turn back mirror 15 and the 3rd turn back mirror 21 respectively to the first photoparametric amplifier 8,
Second photoparametric amplifier 14 and the ideler frequency light of the 3rd photoparametric amplifier 20 amplification are turned back and change height and position.Described
One turn back mirror 9, the second mirror 21 of turning back of mirror 15 and the 3rd of turning back is respectively provided with along the translational adjustment of optical path direction of turning back, and realizes relevant close
Into delay adjustment.
Shu Danyuan is closed in described pulse stretching compression and spectrum beam splitting, is realized for the flashlight before optically erasing unit
Time explanation based on chirp and the space beam splitting based on spectrum, realize for the ideler frequency light after optically erasing unit and are based on
Beam is closed in the time compression of chirp and the space based on spectrum.
In Shu Danyuan is closed in first passage pulse stretching compression and spectrum beam splitting, flashlight passes through the He of the first diffraction rib grid 2
Scattered, transmitted through high dispersion after flat board 4 by the 3rd diffraction rib grid 5 and the 4th in space based on spectrum after second diffraction rib grid 3
Diffraction rib grid 6, the 5th diffraction rib grid 11 and the 6th diffraction rib grid 12 and the 7th diffraction rib grid 17 and the 8th 18 points of diffraction rib grid
For 600-800nm high frequency bands light beam, 800nm-1000nm mf bands light beam and 1000nm-1200nm low-frequency band light
Beam, the space beam splitting based on spectrum is realized while space chirp is fully compensated.In addition, flashlight is introduced into two during being somebody's turn to do
Rank, which bears time chirp, realizes the time explanation of pulse.
In optically erasing unit, 600-800nm high frequency bands light beam, 800nm-1000nm mf bands light beam and
1000nm-1200nm low-frequency bands light beam is respectively by the first photoparametric amplifier 8, the second photoparametric amplifier 14 and the 3rd beche-de-mer without spike
The amplification of the subrane of amplifier 20 is measured, so as to avoid Gain-narrowing effect.What it is due to amplification is time explanation pulse, so as to avoid
Nonlinear effect and gain media damage.When the ideler frequency light of optically erasing unit output amplification has opposite with flashlight
Between chirp, it is achieved thereby that time chirp invert, i.e., ideler frequency light has positive time chirp.
In Shu Danyuan is closed again by pulse stretching compression and spectrum beam splitting, 600-800nm high frequency band light beam ideler frequencies
Light, 800nm-1000nm mf band light beam ideler frequency lights and 800nm-1000nm low-frequency band light beams ideler frequency light are respectively by
Four diffraction rib grid 6 and the 3rd diffraction rib grid 5, the 6th diffraction rib grid 12 and the 5th diffraction rib grid 11 and the 8th diffraction rib grid 18
After the diffraction of the 7th diffraction rib grid 17, spread out after transmiting flat board 4 through high dispersion through the second diffraction rib grid 3 and the first diffraction rib grid 2
Penetrate, the space based on spectrum is realized while space chirp is fully compensated and closes beam.In addition, ideler frequency light is introduced into two during being somebody's turn to do
Rank, which bears time chirp, realizes the time compression of pulse.
Experiment shows, compared with first technology, and the present invention can carry out high increasing to 600nm-1200nm ultra wide bands laser pulse
Benefit amplification, it is to avoid Gain-narrowing effect, nonlinear effect and gain media damage, can produce joule level monocycle laser arteries and veins
Punching.
It should be noted last that, ultra wide band laser is divided into three beams i.e. three frequency band based on spectrum and entered in the present invention
Line broadening, beam splitting, amplification, conjunction beam, compression, can be divided into any beam based on spectrum according to the inventive method ultra wide band laser and appoint
Meaning frequency band enters line broadening, beam splitting, amplification, conjunction beam, compression.It will be understood by those within the art that, to this hair
Bright technical scheme is modified or equivalent, and without departure from the spirit and scope of the present invention, it all should cover in this hair
Among bright right.
Claims (3)
1. a kind of ultra wide band optics coherence tomography Chirp pulse amplification laser system, it is characterised in that the system includes ultra wide band seed
Shu Danyuan, optically erasing unit, speculum and catadioptric mirror, described pulse are closed in source (1), pulse stretching compression and spectrum beam splitting
Shu Danyuan is closed in chirped and spectrum beam splitting includes one piece high dispersion transmission flat board (4), the first diffraction rib grid (2), the second diffraction
Rib grid (3), the 3rd diffraction rib grid (5), the 4th diffraction rib grid (6), the 5th diffraction rib grid (11), the 6th diffraction rib grid (12),
Seven diffraction rib grid (17) and the 8th diffraction rib grid (18), described optically erasing unit include the with different gains bandwidth
One photoparametric amplifier (8), the second photoparametric amplifier (14) and the 3rd photoparametric amplifier (20), described speculum include
First speculum (7), the second speculum (10), the 3rd speculum (13), the 4th speculum (16), the 5th speculum (19) and
Six speculums (22);Described catadioptric mirror includes the first catadioptric mirror (9), the second catadioptric mirror (15) and the 3rd catadioptric mirror (21);
The position relationship of above-mentioned component is as follows:
The flashlight of described ultra wide band seed source (1) output enters pulse stretching compression and Shu Danyuan is closed in spectrum beam splitting:Through
Scatter generation space chirp after one diffraction rib grid (2) and second diffraction rib grid (3) diffraction in space, saturating through described high dispersion
Penetrate and be divided into high frequency band light beam, mf band light beam and low-frequency band light beam after flat board (4):
Described high frequency band light beam eliminates space chirp through the 3rd diffraction rib grid (5) and the 4th diffraction rib grid (6) diffraction, through the
One speculum (7) is reflected into the first photoparametric amplifier (8), and the ideler frequency light after amplification is turned back and changed through the first catadioptric mirror (9)
And of Varying Depth position, through the second speculum (10) reflection through the 4th diffraction rib grid (6) diffraction, through the 3rd diffraction rib grid (5) diffraction, warp
High dispersion transmission flat board (4) transmission, is exported through second diffraction rib grid (3) diffraction, through first diffraction rib grid (2) diffraction;
Described mf band light beam eliminates space chirp, warp through the 5th diffraction rib grid (11) and the 6th diffraction rib grid (12) diffraction
3rd speculum (13) is reflected into the second photoparametric amplifier (14), and the ideler frequency light after amplification is turned back through the second catadioptric mirror (15)
And change height and position, and reflected through the 4th speculum (16), through the 6th diffraction rib grid (12) and the 5th diffraction rib grid (11) diffraction,
Through high dispersion transmission flat board (4) transmission, exported through the second diffraction rib grid (3) and through first diffraction rib grid (2) diffraction;
Described low-frequency band light beam eliminates space chirp, warp through the 7th diffraction rib grid (17) and the 8th diffraction rib grid (18) diffraction
5th speculum (19) is reflected into the 3rd photoparametric amplifier (20), and the ideler frequency light after amplification is turned back through the 3rd catadioptric mirror (21)
And change height and position, and reflected through the 6th speculum (22), through the 8th diffraction rib grid (18) and the 7th diffraction rib grid (17) diffraction,
Through high dispersion transmission flat board (4) transmission, exported through the second diffraction rib grid (3) and first diffraction rib grid (2) diffraction.
2. ultra wide band optics coherence tomography Chirp pulse amplification laser system according to claim 1, it is characterised in that described
First diffraction rib grid (2) are parallel with the second diffraction rib grid (3), the 3rd diffraction rib grid (5), the 4th diffraction rib grid (6), the 5th diffraction
Rib grid (11), the 6th diffraction rib grid (12), the 7th diffraction rib grid (17) are parallel to each other with the 8th diffraction rib grid (18), the first diffraction
Rib grid, the second diffraction rib grid spread out with the 3rd diffraction rib grid, the 4th diffraction rib grid, the 5th diffraction rib grid, the 6th diffraction rib grid, the 7th
Penetrate rib grid, the 8th diffraction rib grid antiparallel on high dispersion transmission flat board (4) mirror image, described pulse stretching compression and spectrum point
Beam close Shu Danyuan introduce 2nd order chromatic dispersion be bear, third-order dispersion is zero.
3. ultra wide band optics coherence tomography Chirp pulse amplification laser system according to claim 1, it is characterised in that described
First turn back mirror (9), second turn back mirror (15) and the 3rd mirror (21) of turning back is respectively provided with along the translational adjustment machine of optical path direction of turning back
Structure, realizes the delay adjustment of optics coherence tomography.
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CN108448374B (en) * | 2018-03-26 | 2020-05-05 | 中国科学院上海光学精密机械研究所 | Periodic magnitude laser system based on hollow optical fiber space coherent beam combination |
US11449559B2 (en) * | 2019-08-27 | 2022-09-20 | Bank Of America Corporation | Identifying similar sentences for machine learning |
CN113612536A (en) * | 2021-08-04 | 2021-11-05 | 乔文超 | Laser dispersion compensation structure based on grating |
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