CN1588221A - Achromatic optical parameter chirp pulse amplifying system - Google Patents
Achromatic optical parameter chirp pulse amplifying system Download PDFInfo
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- CN1588221A CN1588221A CN 200410052916 CN200410052916A CN1588221A CN 1588221 A CN1588221 A CN 1588221A CN 200410052916 CN200410052916 CN 200410052916 CN 200410052916 A CN200410052916 A CN 200410052916A CN 1588221 A CN1588221 A CN 1588221A
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Abstract
The invention is a color-difference and optical parameter chirp eliminating pulse amplifying system, and in the forward direction of laser of a fly-second pulse generating source, it includes in turn a pulse widener, a space dispersing component, a first telescope system, a first nonlinear crystal, a total reflector; and in the reflecting light path of the total reflector, it includes in turn a second telescope system, a second nonlinear crystal, a third telescope system, a space dispersion eliminating component and a pulse compressor; and in the output light path of a pumping laser, it is provided with a beam splitting mirror, the reflected light from the mirror enters the first nonlinear crystal, and the transmitted light from the mirror enters the second one. It widens the applicability of wide-ban amplification: as the central wavelength of the amplified pulse is greater than the double of the wavelength of the pumping light, it can also realize wide-band amplification; it changes narrow-band amplification into wide-band amplification, reduces the pulse width and increases the peak power, thus able to support the amplification of ultrashort ultrastrong pulse at the width narrow to below 15 fs and the gain larger 1000, in 1600 nm wave band.
Description
Technical field
The present invention relates to laser impulse amplification system, particularly a kind of achromatism optics parameter chirped pulse amplification system.
Background technology
Ultrashort ultra-intense laser science is with the development of ultrashort ultra-intense laser, and ultrashort ultra-intense laser is a research object with the interaction and the leading basic research in cross discipline and relevant high-tech sector of material, is important science frontier.The ultrashort ultra-intense laser of miniaturization system that wherein can the output high-power pulse is the basic equipment of ultrashort ultra-intense laser scientific domain research.Here " ultrashort superpower " is meant that the time width of laser pulse is extremely narrow and (is generally less than 100 femtoseconds, 1 femtosecond promptly 10
-15Second, be called for short fs), peak power is high, and greater than 1 terawatt (TW), 1 terawatt (TW) is 10
12W is called for short TW.The time width of ultrashort pulse is subjected to the restriction of spectrum, and spectrum is wide more, and the pulse width that pulse compression may reach is just narrow more.
At present, the ultrashort ultra-intense laser of miniaturization system mainly contains two kinds of implementation methods.The first adopts chirped pulse to amplify (Chirped Pulse Amplification, be abbreviated as CPA) laser system, this technology is comparative maturity comparatively speaking, but its principle itself has the shortcoming that can't overcome, there is serious spectrum gain narrowing in, amplification process low as the input pulse signal to noise ratio (S/N ratio), and lacks the space that increases substantially and improve.It two is to adopt the optical parameter chirped pulse to amplify (Optical ParametricChirped Pulse Amplification, be abbreviated as OPCPA) and the ultrashort ultra-intense laser of chirped pulse amplification (CPA) mixed type system, utilize regenerative amplification and preamplifier state in the alternative former chirped pulse amplification system of optical parameter chirped pulse amplification (OPCPA) level, can improve greatly the output pulse signal to noise ratio (S/N ratio), avoid phenomenon such as gain narrowing, thereby make it under the situation of same pulse energy, can obtain shorter pulse width, thereby peak power is higher.
The ultimate principle of OPCPA system is: the more weak ultrashort pulse of intensity that laser oscillator directly produces, at first be admitted to stretcher, and by introducing chirp value, (1 psec equals 10 to the hundreds of psecs of the broadened one-tenth of pulse
-12Second) long pulse of magnitude; With specific direction incident nonlinear crystal, obtain to shift and next energy again, realize amplifying from monochromatic pump light; Utilize compressor reducer at last, eliminate the existing chirp value of pulse, make long pulse be compressed back ultrashort pulse, finally realize the output of ultrashort, super strong laser pulse.Wherein in nonlinear crystal, when the wave vector direction of flashlight and pump light is identical, be called conllinear OPCPA, the centre wavelength that is exaggerated pulse is about 2 times of pump light wavelength; When the wave vector direction of flashlight and pump light forms an angle, be called non-colinear OPCPA, the centre wavelength that is exaggerated pulse is less than 2 times of the pump light wavelength;
In the prior art, people such as the breadboard Igor Jovanovic of U.S. livre More provide a kind of typical miniaturization non-colinear OPCPA and the ultrashort ultra-intense laser of CPA mixed type system, see Optics Letters, Vol.27, No.18,1622-1624,2002, UCRL-JC-146224,2001, its light path arrangement is as shown in Figure 1.Titanium jewel mode locking oscillator 1 output center wavelength is the chirped pulse of pulsewidth～600ps, energy～0.5nJ at～820nm (nanometer), pulsewidth for broadened device 2 broadenings of mode locking pulse of～20fs, under the guiding of catoptron 3 and catoptron 4, inject OPCPA amplifier stage 13 as flashlight.By the pulsewidth～6.9ns of q-multiplier YAG laser instrument 5 output of a platform independent, the 532nm pulse of energy 1.5J, as pump light,, inject OPCPA amplifier stage 13 simultaneously in the non-colinear mode with flashlight by energy attenuator 6 decay backs.OPCPA amplifier stage 13 is made up of BBO (barium metaborate) crystal 7, bbo crystal 11, catoptron 8, catoptron 9, catoptron 10 and catoptron 12, and wherein bbo crystal 7 and bbo crystal 11 all are operated under the mode of non-colinear I saphe coupling.Through the amplification of OPCPA amplifier stage 13, the flashlight energy is increased to～2mJ, and is used as the pump light that CPA titanium jewel leads to amplifier stage 16 more through the residue 532nm pump light behind the OPCPA amplifier stage 13.So flashlight is under the guiding of catoptron 14, pump light injects CPA titanium jewel and leads to amplifier stage 16 more under the guiding of catoptron 15.Lead to amplifier stage 16 through CPA titanium jewel, flashlight is amplified to～45mJ more.Then, flashlight has been exported the ultrashort pulse of pulse width～60fs under the compression of pulse shortener 17.
Overlap the scale-up problem that OPCPA system similar techniques can solve near the ultrashort light pulse of centre wavelength 1064nm and 800nm with this.But the scale-up problem for the ultrashort light pulse of 1600nm wave band does not have the feasible scheme of reality.Reason is, uses the long pump light of wavelength, and the broadband OPCPA system that is set up as the titanium bijouterie laser about 800nm, Nd ion laser about 1064nm can't provide enough big gain; And use the short pump light of wavelength, and as the Nd ion double-frequency laser about 532nm, but can't realize that the broadband amplifies at the 1600nm wave band, the centre wavelength that is exaggerated pulse is less than 2 times of the pump light wavelength.
Summary of the invention
The objective of the invention is to overcome above-mentioned the deficiencies in the prior art, a kind of achromatism optics parameter chirped pulse amplification system is provided, expand the applicable wavelengths scope that amplify in the broadband with this:, can realize that also the broadband amplifies when the centre wavelength that is exaggerated pulse during greater than 2 times of pump light wavelength; The band that narrows down is enlarged into the broadband and amplifies, and has dwindled pulse width, has improved peak power, narrowly amplifies greater than 1000 ultrashort superpower pulse to the following width of 15fs, gain thereby can support at the 1600nm wave band.
The characteristics of achromatism optics parameter chirped pulse amplification system are in the OPCPA system, flashlight is introduced angular dispersion, the light composition of different frequency in the signal pulse is transmitted along phase matching direction separately in nonlinear crystal, can be implemented in the phase matching in the wide spectral range, finish broadband light and amplify.
Technical scheme of the present invention is as follows:
A kind of achromatism optics parameter chirped pulse amplification system, comprise that the source takes place femtosecond pulse, pump laser, pulse stretcher and pulse shortener, it is characterized in that the laser working direction in femtosecond pulse generation source is pulse stretcher successively, the spatial dispersion element, first telescopic system, first nonlinear crystal, total reflective mirror, be second telescopic system successively on the reflected light path of this total reflective mirror, second nonlinear crystal, the 3rd telescopic system, spatial dispersion element and pulse shortener disappear, on the output light path of pump laser, be provided with beam splitter, the reflected light of this beam splitter is injected first nonlinear crystal, and the transmitted light of this beam splitter enters second nonlinear crystal.
The ultrashort pulse row injected pulse stretcher that femtosecond pulse generation source produces is stretched to the hundreds of picosecond magnitude.Afterwards, under the effect of spatial dispersion element, flashlight has been introduced into angular dispersion.Hot spot on the spatial dispersion element is imaged on first nonlinear crystal with certain optical magnification by first telescopic system;
The short wavelength's pump light that is sent by pump laser injects nonlinear crystal at an angle with flashlight under the guiding of catoptron;
Through the first nonlinear crystal amplifying signal light, by the 3rd telescopic system and the spatial dispersion element collimation back (inverse process of the spatial dispersion element and first telescopic system just) that disappears, be incorporated into pulse shortener, export ultrashort superpower laser pulse after compression.
Described flashlight after first nonlinear crystal amplifies behind the 3rd telescopic system and the spatial dispersion element collimation that disappears, is incorporated into pulse shortener again after CPA amplifies, export ultrashort superpower laser pulse after compression.
Described achromatism optics parameter chirped pulse amplification system also comprises first beam splitter and second nonlinear crystal, described short wavelength's pump light is divided into two bundles through first beam splitter, inject first nonlinear crystal and second nonlinear crystal respectively, as the energy source of amplifier; Through the first nonlinear crystal amplifying signal light by big picture such as second telescopic system one-tenth on second nonlinear crystal.Flashlight is collimated the ultrashort superpower laser pulse of output after the pulse shortener compression by the 3rd telescopic system and the diffusing element of colour killing after amplifying.
Described flashlight after second nonlinear crystal amplifies is collimated by the 3rd telescopic system and the diffusing element of colour killing, is incorporated into pulse shortener more after compression after CPA amplifies, and exports ultrashort superpower laser pulse.
Described pump laser is q-multiplier YAG laser instrument, semiconductor laser or YAG laser instrument.
Described femtosecond pulse generation source is titanium jewel self mode-locked laser, femtosecond pulse parametric generator, femtosecond dye laser or femtosecond Nd:YLF laser instrument.
Described nonlinear crystal is lbo crystal, bbo crystal or KDP crystal.
Described spatial dispersion element is that grating or prism constitute.
The described spatial dispersion element that disappears is that grating or prism constitute, and its parameters should be identical with the spatial dispersion element, but conjugate position is got in its placement.
Described telescopic system by lens to constituting, first telescopic system and the 3rd telescopic system structure entirely with, but device puts in order and puts the cart before the horse, and long-pendingly should be 1 so the optical magnification of first telescopic system and the 3rd telescopic system is.
The present invention has following technique effect:
In the achromatism OPCPA of the present invention system, flashlight has been introduced angular dispersion by dispersion element, makes in OPCPA originally the wave band that can only the arrowband amplifies, and can realize also that now the broadband amplifies.Can realize that the wavelength coverage that amplify in the broadband has enlarged one times.At the flashlight wave band of wavelength greater than 2 times of pump lights, the band that narrows down is enlarged into the broadband and amplifies; Simultaneously, kept the advantage that OPCPA system high-gain is amplified under short wavelength's pumping again, improved the output pulse power, realized that the pulse of big spectrum width is amplified, amplifying for the ultrashort superpower pulse of 10fs magnitude provides the spectrum basis.
The present invention is further illustrated below in conjunction with accompanying drawing and embodiment.
Description of drawings
Fig. 1 is the structural representation of existing OPCPA and the ultrashort ultra-intense laser of CPA mixed type system.
Fig. 2 is the structural representation of achromatism optics parameter chirped pulse amplification system specific embodiment of the present invention.
Embodiment
See also Fig. 2 earlier, Fig. 2 is the structural representation of achromatism optics parameter chirped pulse amplification system specific embodiment of the present invention.As seen from the figure, achromatism optics parameter chirped pulse amplification system of the present invention, comprise that source 18 takes place femtosecond pulse, pump laser 20, pulse stretcher 19 and pulse shortener 30, it is characterized in that the laser working direction in femtosecond pulse generation source 18 is pulse stretcher 19 successively, spatial dispersion element 22, first telescopic system 23, first nonlinear crystal 24, total reflective mirror 29, be second telescopic system 25 successively on the reflected light path of this total reflective mirror 29, second nonlinear crystal 26, the 3rd telescopic system 27, spatial dispersion element 28 and pulse shortener 30 disappear, on the output light path of pump laser 20, be provided with beam splitter 21, the reflected light of this beam splitter 21 injects first nonlinear crystal 24, and the transmitted light of this beam splitter 21 injects second nonlinear crystal 26.
Wherein femtosecond pulse light pulse that source 18 outputs take place has that pulse width is extremely narrow, the characteristics of spectral width broad, can be femtosecond pulse lasers such as titanium jewel femtosecond mode locking pulse laser instrument, femtosecond pulse parametric generator, dye laser, Nd:YLF mode-locked laser.In the present embodiment, femtosecond mode locking pulse oscillator 18 is selected the femtosecond pulse parametric generator for use, and light impulse length is 20fs.
First nonlinear crystal 24 of the present invention and first nonlinear crystal 26 can adopt nonlinear crystals such as lbo crystal, bbo crystal, KDP crystal, select lbo crystal in the present embodiment for use.
The spatial dispersion element 28 that disappears of the present invention can be grating, prism etc.Select grating in the present embodiment for use.Its parameters should be identical with described spatial dispersion element 22, but conjugate position is got in its placement.
Described telescopic system by lens to constituting, first telescopic system 23 and the 3rd telescopic system 27 structures entirely with, but device puts in order and puts the cart before the horse, thus the optical magnification of first telescopic system 23 and the 3rd telescopic system 27 long-pending be 1.
The course of work of achromatism OPCPA system embodiment of the present invention is as follows:
(1) ultrashort pulse that source 18 produces centre wavelength 1600nm takes place in femtosecond pulse, and the individual pulse width reaches the ultrashort mode locking pulse row of 20fs;
(2) this ultrashort pulse row injected pulse stretcher 19 becomes chirped pulse under the effect of pulse stretcher 19, and broadening is to 200ps;
(3) pulse behind the broadening is produced angular dispersion by spatial dispersion element 22 (grating) institute diffraction;
(4) first telescopic systems 23 image in the hot spot on the grating 22 on first nonlinear crystal 24 according to suitable optical magnification, the optical magnification of the parameter of grating 22 and first telescopic system 23 has no particular limits, and just requires intracrystalline space divergence to be; 0.037rad/ μ m.
(4) two bundles that are divided into by beam splitter 21 of the pump light of pump laser 20 output, the energy ratio is 1: 1, reflected light and transmitted light are directed to first nonlinear crystal 24 and second nonlinear crystal 26 respectively;
(5) flashlight and the pump light that is come by 23 guidings of first telescopic system is in together in the X-Y plane of first nonlinear crystal 24 (lbo crystal), each other in 2.25 ° of angles.And pump light becomes 12.6 ° with the x axle of first nonlinear crystal 24.The power density of pump light pulse should reach 3GW/cm
2This light path of fine tuning can realize that the flashlight gain up to the fidelity power amplification more than 1000 times, has promptly kept the power amplification of pulse spectrum width;
The output optical pulse of (6) first nonlinear crystals 24 is introduced 1: 1 second telescopic system 25 of optical magnification by total reflective mirror 29, is imaged on second nonlinear crystal 26 (lbo crystal).Keep and first nonlinear crystal, 24 identical light path arrangement in second nonlinear crystal 26, the power of signal pulse is further amplified.It is to be noted that total reflective mirror 29 is not necessary element, occur just convenience here in order to draw.
(7) flashlight after the amplification is introduced into the 3rd telescope 27 and the spatial dispersion element 28 (grating) that disappears, to eliminate spatial dispersion.The final recovery of flashlight after the amplification becomes a branch of collimated light, is incorporated into pulse shortener 30 again, exports ultrashort superpower laser pulse after compression.
In addition, in order to meet design requirement, make full use of the space, or, can introduce other auxiliary optical component in order to ensure the needs of quality of output beam etc., as catoptron, lens etc.; Also can in light path, introduce devices such as attenuator, spectrum shaping, dispersion compensation, to optimize the output pulse quality.
In the achromatism OPCPA of the present invention system, the experiment proved that flashlight has been introduced angular dispersion by dispersion element, make in OPCPA originally the wave band that can only the arrowband amplifies, can realize that now the broadband amplifies.Can realize that the wavelength coverage that amplify in the broadband has enlarged one times.At the flashlight wave band of wavelength greater than 2 times of pump lights, the band that narrows down is enlarged into the broadband and amplifies; Simultaneously, kept the advantage that OPCPA system high-gain is amplified under short wavelength's pumping again, improved the output pulse power, realized that the pulse of big spectrum width is amplified, amplifying for the ultrashort superpower pulse of 10fs magnitude provides important foundation.
Claims (7)
1, a kind of achromatism optics parameter chirped pulse amplification system, comprise that source (18) takes place femtosecond pulse, pump laser (20), pulse stretcher (19) and pulse shortener (29), it is characterized in that the laser working direction in femtosecond pulse generation source (18) is pulse stretcher (19) successively, spatial dispersion element (22), first telescopic system (23), first nonlinear crystal (24), total reflective mirror (29), be second telescopic system (25) successively on the reflected light path of this total reflective mirror (29), second nonlinear crystal (26), the 3rd telescopic system (27), spatial dispersion element (28) and pulse shortener (30) disappear, on the output light path of pump laser (20), be provided with beam splitter (21), the reflected light of this beam splitter (21) is injected first nonlinear crystal (24), and the transmitted light of this beam splitter (21) enters second nonlinear crystal (26).
2, achromatism optics parameter chirped pulse amplification system according to claim 1 is characterized in that described pump laser (20) is q-multiplier YAG laser instrument, semiconductor laser or YAG laser instrument.
3, achromatism optics parameter chirped pulse amplification system according to claim 1 is characterized in that source (18) takes place described femtosecond pulse is titanium jewel self mode-locked laser, femtosecond pulse parametric generator, femtosecond dye laser or femtosecond Nd:YLF laser instrument.
4, achromatism optics parameter chirped pulse amplification system according to claim 1 is characterized in that described nonlinear crystal is lbo crystal, bbo crystal or KDP crystal.
5, achromatism optics parameter chirped pulse amplification system according to claim 1 is characterized in that described spatial dispersion element (22) is that grating or prism constitute.
6, achromatism optics parameter chirped pulse amplification system according to claim 1, it is characterized in that the described spatial dispersion element (28) that disappears is that grating or prism constitute, its parameters should be identical with spatial dispersion element (22), but conjugate position is got in its placement.
7, achromatism optics parameter chirped pulse amplification system according to claim 1, it is characterized in that described telescopic system by lens to constituting, first telescopic system (23) and the 3rd telescopic system (27) structure are entirely together, but device puts in order and puts the cart before the horse, so the amassing of the optical magnification of first telescopic system (23) and the 3rd telescopic system (27) should be 1.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100373714C (en) * | 2006-01-12 | 2008-03-05 | 复旦大学 | Method for increasing output pulse multiplexing efficiency of neodymium glass femtosecond mode locking oscillator |
| CN100431228C (en) * | 2006-11-09 | 2008-11-05 | 复旦大学 | A high rate multi-stage pulse compression method based on nonlinear cascade process |
| CN100452569C (en) * | 2007-05-29 | 2009-01-14 | 中国科学院上海光学精密机械研究所 | Optical parameter chirp impulse amplification laser system |
| CN101832776A (en) * | 2010-05-17 | 2010-09-15 | 西安电子科技大学 | Pulsar signal de-dispersion instrument based on FPGA (Filed Programmable Gate Array) |
| CN102522688A (en) * | 2012-01-04 | 2012-06-27 | 中国科学院物理研究所 | High-contrast femtosecond laser generating device |
| US8947771B2 (en) | 2006-07-12 | 2015-02-03 | Hamamatsu Photonics K.K. | Optical amplifying device |
| CN109188686A (en) * | 2018-10-19 | 2019-01-11 | 湖北航天技术研究院总体设计所 | A kind of method and apparatus that collimated light path light path shortens |
| CN111799645A (en) * | 2020-05-27 | 2020-10-20 | 杭州奥创光子技术有限公司 | Chirp pulse compression synthesis system and application method thereof |
-
2004
- 2004-07-16 CN CN 200410052916 patent/CN1588221A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100373714C (en) * | 2006-01-12 | 2008-03-05 | 复旦大学 | Method for increasing output pulse multiplexing efficiency of neodymium glass femtosecond mode locking oscillator |
| US8947771B2 (en) | 2006-07-12 | 2015-02-03 | Hamamatsu Photonics K.K. | Optical amplifying device |
| CN100431228C (en) * | 2006-11-09 | 2008-11-05 | 复旦大学 | A high rate multi-stage pulse compression method based on nonlinear cascade process |
| CN100452569C (en) * | 2007-05-29 | 2009-01-14 | 中国科学院上海光学精密机械研究所 | Optical parameter chirp impulse amplification laser system |
| CN101832776A (en) * | 2010-05-17 | 2010-09-15 | 西安电子科技大学 | Pulsar signal de-dispersion instrument based on FPGA (Filed Programmable Gate Array) |
| CN102522688A (en) * | 2012-01-04 | 2012-06-27 | 中国科学院物理研究所 | High-contrast femtosecond laser generating device |
| CN109188686A (en) * | 2018-10-19 | 2019-01-11 | 湖北航天技术研究院总体设计所 | A kind of method and apparatus that collimated light path light path shortens |
| CN111799645A (en) * | 2020-05-27 | 2020-10-20 | 杭州奥创光子技术有限公司 | Chirp pulse compression synthesis system and application method thereof |
| CN111799645B (en) * | 2020-05-27 | 2021-11-05 | 杭州奥创光子技术有限公司 | Chirp pulse compression synthesis system and application method thereof |
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