CN101764341B - Wideband optical parametric chirped pulse amplification laser system with stable carrier envelope phase - Google Patents
Wideband optical parametric chirped pulse amplification laser system with stable carrier envelope phase Download PDFInfo
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Abstract
The invention relates to a wideband optical parametric chirped pulse amplification (OPCPA) laser system with a stable carrier envelope phase. The laser system comprises a femtosecond laser device with an output wavelength of 1550nm, a spectroscope, a signal light generator, a stretcher, an angular disperser, a photonic crystal fiber frequency converter, a regenerative amplifier, multi-level Nd: yttrium aluminum garnet (YAG) amplifier, a reflection mirror, an optical parametric amplifier and a compressor. The wideband optical parametric chirped pulse amplification laser system is characterized in that a wideband signal light generated by difference frequency action has a high circular error probable (CEP) stability and a tunable characteristic of the wideband; the signal light and pump light are from the same laser device; under a condition of ignoring the environment jitter influence, the high-precision time synchronization with 10-femtosecond between a signal light pulse and a pump light pulse can be ensured, and the invention has a good frequency stabilization effect; OPCPA of the wideband is realized by means of the angular disperser, and an intermediate infrared tunable laser source is obtained.
Description
Technical field
The present invention relates to the stable wideband optical parametric chirped pulse of a kind of carrier envelope phase (abbreviating CEP as) and amplify (being designated hereinafter simply as OPCPA) laser system, belong to ultrashort superpower femtosecond pulse amplifying technique.
Background technology
The femtosecond laser amplifying technique has obtained fast development in several years in the past, for the mankind fully explore the microcosmic ultrafast phenomena and research high field physics provides practical means and opportunity to develop not seen before.Especially superpower ultrashort femtosecond laser occurs, because it has the peak power of superelevation and ultrashort pulse duration, thereby at the laser fast ignition, high-energy physics, high strength X-ray irradiation source, particle quickens, produce x-ray laser, produce the laser high order harmonic component and obtain Ah second's laser pulse, produce physics research field such as neutron and obtained using widely, some novel physical phenomenons of having brought unanticipated to arrive to scientists.
In order to obtain superpower ultrashort femto-second laser pulse, proposed by Dubietis in 1992, and in 1997 its optical parameter chirped pulse that develops is amplified (OPCPA) technology by people such as Ross, combine chirped pulse and amplify (Chirped pulse amplification, abbreviating CPA as) technology and parameter amplify the advantage separately of (OPA) technology, becomes the research focus of modern laser amplification technique.Though Cheng Gong the OPCPA technology of passing through has obtained superpower ultrashort near-infrared femto-second laser pulse, but, in the acquisition of infrared femto-second laser pulse brought challenge for the OPCPA amplifying technique, it not only requires system can produce the stable broadband signal light of CEP, amplify but also need carry out the broadband, require between flashlight and the pump light high precision synchronous simultaneously it.Therefore, research CEP stable in infrared wideband optical parametric chirped pulse amplification laser system become one of studying a question of current forefront.
People such as Chalus in 2009 at article " Design and simulation of few-cycle opticalparametric chirped pulse amplification at mid-IR wavelengths ", OpticsExpres s, Vol.16 Issue 26, among the pp.21298-21304, this mid-infrared light is learned parameter chirped pulse amplification laser system structure as shown in Figure 2.Figure 2 shows that existing mid-infrared light parameter chirped pulse amplification laser system structure chart.In Fig. 2, fiber laser 01 output center wavelength is respectively the two-color laser of 1550nm and 1050nm, its medium wavelength is that the laser of 1050nm is directly inputted to the cycle that is used to produce difference frequency signal and intensifies lithium niobate (being designated hereinafter simply as PPLN) crystal 03, and wavelength to be the laser of 1550nm also be input on the PPLN crystal 03 by postponing control 02, then this two-way laser pulse produces infrared signal light among the 3.26um by difference frequency in the PPLN crystal, this flashlight passes through stretcher 04 broadening again to picosecond magnitude, as the flashlight of OPA amplifier 08; The pump light of OPA amplifier 08 is provided by the picosecond magnitude laser 06 of another output wavelength for 1064nm.In order to realize that parameter amplifies, control by repetition rate locked plug-in unit 05 and delay 07 between pump light and the flashlight.After amplifying through OPA amplifier 08 from the flashlight of stretcher 04, again through compressor reducer 09 compression, just obtained wavelength and be 3.26um in infrared ultrashort ultra-intense laser light source.In this system, the electric Synchronization Control of synchronous employing between pump light and the flashlight has finally obtained the middle infrared excess short pulse of 56fs.Because this system adopts electric Synchronization Control, the poor stability of amplifying signal pulse, and, the two-way that is used for the difference frequency effect is only exported single-frequency light from the two-way of fiber laser, the CEP flashlight that difference frequency produces is a single-frequency, not only do not possess tunability, and the new flashlight CEP less stable that produces, thereby be subjected to bigger restriction in actual applications.
At present, the broadband seed source that the optical parameter chirped pulse amplifies in (OPCPA) laser system can adopt crystal and photonic crystal fiber to realize, normally the pump light that oscillator is produced directly is injected in crystal or the photonic crystal fiber, utilizes continuous spectrum that their high non-linearity effect produces as seed source.With regard to seed source, it is bigger that oscillator has a volume, frequency stability is poor, shortcomings such as time jitter is bigger, and, the seed source that utilizes these methods to obtain does not have the CEP stable properties, thereby brings significant damage often for the stability of optical parameter chirp impulse amplification laser system and full phototiming, and then has limited the applicable scope of OPCPA amplification system.
Summary of the invention
In order to improve the stability of system, obtain the full phototiming of high accuracy and realize that the broadband OPCPA laser of CEP high stable amplifies, the present invention proposes a kind of wideband optical parametric chirped pulse amplification laser system of carrier envelope stable phase, this system can not only improve the CEP stability of amplifying signal, and can guarantee the full phototiming of high accuracy of 10 femtosecond magnitudes between pump light and the seed light under the situation of ignoring the environment effect of jitter, realized that also infrared OPCPA amplifies in the tunable broadband.
Technical solution of the present invention is:
A kind of wideband optical parametric chirped pulse amplification laser system of carrier envelope stable phase, by output wavelength is the laser of 1550nm, the flashlight generator, stretcher, the angular dispersion device, the photonic crystal fiber frequency converter, dichroic mirror, regenerative amplifier, multistage Nd:YAG amplifier, speculum, optical parameter amplifier and compressor reducer are formed, the position of above-mentioned components and parts is as follows: the femto-second laser pulse of laser output 1550nm, by being divided into two bundles behind the spectroscope, after wherein a branch of femto-second laser pulse is incorporated into the photonic crystal fiber frequency converter by speculum, generation comprises the broadband spectral of 1064nm, this broadband spectral is then by the dichroic mirror separated into two parts, the part narrow-band spectrum that wherein comprises 1064nm is transported in regenerative amplifier and the multistage Nd:YAG amplifier amplifies, and the light pulse of the 1064nm after the amplification is as the pump light of optical parameter amplifier.Another part light that obtains by dichroic mirror and incide together in the flashlight generator by another bundle 1550nm femto-second laser pulse that spectroscope obtains, utilize their difference frequency be used for obtaining CEP stable in infrared wideband light source.The flashlight generator is controlled by temperature, thus difference frequency produce in infrared wideband light source have tunability.Infrared wideband light source passes through the stretcher broadening then to picosecond magnitude in this, broadband signal light pulse behind the broadening is again by after the effect of angular dispersion device, will be input in the optical parameter amplifier with different angles, as flashlight, so, this signal pulse with obtain amplifying by the parameter effect in the OPA amplifier from the pump light pulse of multistage Nd:YAG amplifier, signal pulse after the amplification passes through compressor compresses at last, just obtains infrared femto-second laser pulse in high-peak power tunable.
The frequency doubled light of described 1550nm femtosecond laser just in time is in the working range of titanium jewel (Ti:sapphire) laser, and ti sapphire laser synchronously is as seed source.
The centre wavelength of described femto-second laser output is positioned at the dispersion region of photonic crystal fiber, and the zero dispersion point of close photonic crystal fiber.Utilize photonic crystal fiber to carry out the ultra broadband light source that frequency inverted obtains to comprise 1064nm, help being used for producing the middle infrared spectrum of different frequency.
Described flashlight generator intensifies lithium columbate crystal by the cycle and temperature control device constitutes, and is used for producing the tunable broad band signal optical source of CEP high stable.
The difference frequency effect of the two-way light of described flashlight after by the light pulse beam splitting of same laser output obtains, and the CEP stability that obtains is higher.
Described angular dispersion device is made up of grating pair and lens, can be used to change the input angle of different frequency signals light, realizes the phase matched between unlike signal light and the pump light, and then realizes the broadband amplification easily.
Described optical parameter amplifier uses KTP or KTA crystal to realize, adopts non-colinear phase matched mode between flashlight and the pump light.
Described OPA amplifier can select to adopt one-level or multistage amplification as requested.
Described OPCPA amplification system can obtain the carrier envelope phase high stable in infrared femtosecond laser light source.
Described OPCPA amplification system, under the situation of ignoring the environment effect of jitter, full phototiming precision can reach 10 femtosecond magnitudes, can be controlled in the real process in the scope less than 10 psecs.
Great advantage of the present invention is:
The stability of system is high, full phototiming precision reaches 10 femtosecond magnitudes under the situation of ignoring the environment effect of jitter, flashlight CEP high stable and tunable, can realize that infrared OPCPA amplifies in the broadband, the tunable IR femtosecond laser light source is simple in structure in the acquisition, flexibly, be convenient to integratedly, its objective is to the high power laser light amplification system provides seed light source stable, high-contrast and is used for chirped pulse generation system.
Description of drawings
Fig. 1 is the broadband OPCPA laser amplifier system structural representation of carrier envelope stable phase of the present invention.
Fig. 2 is that existing mid-infrared light is learned parameter chirped pulse amplification laser system structural representation.
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, Fig. 1 is the stable broadband OPCPA laser amplifier system structure chart of CEP of the present invention.It also is the structural representation of one embodiment of the present of invention.As seen from Figure 1, the broadband OPCPA laser amplifier system that CEP of the present invention is stable, by output wavelength is the laser 1 of 1550nm, spectroscope 2, flashlight generator 3, stretcher 4, angular dispersion device 5, photonic crystal fiber frequency converter 7, dichroic mirror 8, regenerative amplifier 9, multistage Nd:YAG amplifier 10, first speculum 6 and second speculum 11, optical parameter amplifier 12 and compressor reducer 13 constitute, moving towards of system light path is as follows: laser 1 output 1550nm femto-second laser pulse, behind spectroscope 2, be divided into two bundles, wherein a branch of femtosecond pulse is incorporated into photonic crystal fiber frequency converter 7 backs by first speculum 6 and produces the broadband spectral that comprises 1064nm, this broadband spectral is then by dichroic mirror 8 separated into two parts, the part narrow-band spectrum that wherein comprises 1064nm is introduced in regenerative amplifier 9 and the multistage Nd:YAG amplifier 10 amplifies, and the light pulse of the 1064nm after the amplification is as the pump light of optical parameter amplifier 12.And another part wideband light source that obtains by dichroic mirror 8 and be incorporated into together in the flashlight generator 3 from another bundle femto-second laser pulse of spectroscope 2 utilizes their difference frequency effect to obtain the stable middle infrared signal light source of CEP.Process stretcher 4 broadenings are to picosecond magnitude successively then in this mid-infrared light source, and the light pulse behind the broadening is by behind the angular dispersion device 5, and the flashlight of different frequency will incide with different angles in the optical parameter amplifier 12, as flashlight.So, signal pulse with obtain amplifying by the optical parameter effect in OPA amplifier 12 from the pump light pulse of multistage Nd:YAG amplifier 10, signal pulse after the amplification compresses through compressor reducer 13 at last, just obtains infrared femtosecond laser in high-peak power tunable.
Present embodiment is compared with Fig. 2 prior art, has the following advantages:
(1) compare with Fig. 2, the broadband signal in Fig. 1 system is only tunable, and is controlled, rather than single middle infrared signal light source.
(2) OPCPA laser amplifier system shown in Figure 1 is the wideband optical parametric amplification system of a CEP high stable,
Can obtain the tunable mid-infrared laser light source of CEP high stable after the compression, Fig. 2 then can not.
(3) the OPA flashlight among Fig. 2 is that the difference frequency of the two-way light pulse by two-way output laser output is used for acquisition, and the OPA flashlight among Fig. 1 is earlier the light pulse of laser output to be divided into two bundles, utilize them to be used for obtaining then by difference frequency, compare with Fig. 2, the CEP stability of the flashlight that obtains among Fig. 1 is higher.
(4) compare with Fig. 2, the OPA flashlight is the wideband adjustable light source of CEP high stable among Fig. 1, thus this OPCPA laser amplifier system also to be that the broadband is amplified tunable, the scope of application is wider, and is wideer.
(5) pump light among Fig. 2 and flashlight be from various lasers, employing be electric Synchronization Control, synchronization accuracy is at picosecond magnitude, and Fig. 1 employing is full phototiming control, synchronization accuracy can be realized 10 femtosecond magnitudes, and synchronization accuracy is much higher, and the stability of a system is better.
Claims (5)
1. the wideband optical parametric chirped pulse amplification laser system of a carrier envelope stable phase, by output wavelength is the laser (1) of 1550nm, spectroscope (2), flashlight generator (3), stretcher (4), angular dispersion device (5), photonic crystal fiber frequency converter (7), dichroic mirror (8), regenerative amplifier (9), multistage Nd:YAG amplifier (10), first speculum (6) and second speculum (11), optical parameter amplifier (12) and compressor reducer (13) constitute, the position of light path trend and components and parts is as follows: laser (1) output 1550nm femto-second laser pulse, behind spectroscope (2), be divided into two bundles, wherein a branch of femtosecond pulse is incorporated into photonic crystal fiber frequency converter (7) by first speculum (6), generation comprises the ultra-continuous wideband spectrum of 1064nm, this broadband spectral is then by dichroic mirror (8) separated into two parts, the part narrow-band spectrum that wherein comprises 1064nm is introduced in regenerative amplifier (9) and multistage Nd:YAG amplifier (10) amplifies, the light pulse of 1064nm after the amplification is as the pump light of optical parameter amplifier (12), and another part wideband light source that obtains by dichroic mirror (8) and be incorporated into together in the flashlight generator (3) from another bundle femto-second laser pulse of spectroscope (2), utilize the difference frequency effect to obtain the middle infrared signal light source of carrier envelope stable phase, then, after the infrared signal light source passes through stretcher (4) broadening and angular dispersion device (5) successively in being somebody's turn to do, be input in the optical parameter amplifier (12), as flashlight, so, signal pulse with obtain amplifying by the optical parameter effect in optical parameter amplifier (12) from the pump light pulse of multistage Nd:YAG amplifier (10), signal pulse after the amplification passes through compressor reducer (13) at last and compresses, and just obtains infrared femtosecond laser in high-peak power tunable.
2. the wideband optical parametric chirped pulse amplification laser system of carrier envelope stable phase according to claim 1, it is characterized in that described femto-second laser (1) output center wavelength is 1550nm, pulse duration is less than 100 femtoseconds, power is positioned at the dispersion region of photonic crystal fiber greater than the light pulse of 250mW, and near the zero dispersion point of photonic crystal fiber.
3. the wideband optical parametric chirped pulse amplification laser system of carrier envelope stable phase according to claim 1 is characterized in that described flashlight generator (3) intensifies lithium columbate crystal by the cycle and temperature control device constitutes.
4. the wideband optical parametric chirped pulse amplification laser system of carrier envelope stable phase according to claim 1 is characterized in that described angular dispersion device (5) is made up of grating pair and lens.
5. the wideband optical parametric chirped pulse amplification laser system of carrier envelope stable phase according to claim 1, it is characterized in that described optical parameter amplifier (12) uses KTP or KTA crystal to realize, adopts non-colinear phase matched mode between flashlight and the pump light.
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| CN102522689B (en) * | 2011-12-21 | 2013-08-14 | 中国科学院上海光学精密机械研究所 | Wide spectral bandwidth ultrashort laser pulse seed source with stable carrier-envelope phase |
| CN103399447A (en) * | 2013-08-13 | 2013-11-20 | 中国航空工业集团公司北京长城计量测试技术研究所 | Generation method and device for dual-spectrum femtosecond laser frequency comb |
| US9244332B1 (en) | 2014-12-22 | 2016-01-26 | Deutsches Elektronen-Synchrotron Desy | Pulse light source device and method for creating fs pulses |
| DE202014010153U1 (en) | 2014-12-22 | 2015-10-29 | Deutsches Elektronen-Synchrotron Desy | Pulsed light source device for generating fs pulses |
| CN108493753B (en) * | 2018-03-12 | 2019-10-29 | 中国人民解放军国防科技大学 | Large-range wavelength tunable infrared laser based on super-continuum spectrum difference frequency |
| CN110187588B (en) * | 2019-04-29 | 2020-11-17 | 华中科技大学 | Broadband optical parametric amplification method and device based on cascade crystal |
| CN110739603B (en) * | 2019-09-30 | 2020-09-01 | 中国科学院西安光学精密机械研究所 | Medium-long wave infrared femtosecond pulse generating and amplifying device |
| CN112366504B (en) * | 2020-11-18 | 2022-10-04 | 深圳大学 | Radial polarized light parametric amplifier insensitive to polarization and amplification method |
| US11201448B1 (en) * | 2020-12-02 | 2021-12-14 | Bae Systems Information And Electronic Systems Integration Inc. | Optical mixing approach for controlling electro-magnetic attributes of emitted laser pulses |
| CN114153084B (en) * | 2021-12-01 | 2023-07-25 | 电子科技大学 | Method for regulating optical properties of direct band gap semiconductor element with ultra-high time precision |
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