CN102522689B - Wide spectral bandwidth ultrashort laser pulse seed source with stable carrier-envelope phase - Google Patents
Wide spectral bandwidth ultrashort laser pulse seed source with stable carrier-envelope phase Download PDFInfo
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Abstract
The invention relates to a wide spectral bandwidth ultrashort laser pulse seed source with a stable carrier-envelope phase (CEP). The seed source comprises a pumping source, a parametric amplification system, a spectrum widening system and a dispersion compensation system. Two difference frequency processes in parametric amplification are utilized to generate light beams with stable CEPs; a dichroic mirror is used to carry out beam combination; the combined light beam is coupled by a lens and then enters a hollow fiber to carry out spectrum widening and pulse compression; and then, a femtosecond ultrashort laser pulse output that has a stable CEP and a continuous super-wide spectral bandwidth is obtained. According to the invention, the seed source is simple and is easy to operate; a gap problem during combination of light beams with different wave bands can be solved; continuous super-wide spectral bandwidths can be obtained; and a femtosecond ultrashort laser pulse output of a monocyclic order or even a sub-cyclic order can be obtained by compression, wherein the output has a stable CEP; therefore, the seed source can be widely applied to many fields like attosecond pulse generation, pumping detection and THz generation and the like.
Description
Technical field
The present invention relates to ultrashort laser pulse, the stable wide spectral bandwidth ultrashort laser pulse seed source of a kind of carrier envelope phase (abbreviating CEP as) particularly, this device carries out spectrum widening to the stable light beam of CEP of the different-waveband of two parameter amplification process outputs simultaneously by hollow optic fibre, obtain continuous ultra-wide spectrum bandwidth, the compression back obtains the femtosecond ultrashort laser pulse in monocycle and even inferior cycle.
Background technology
For the laser pulse of cycle magnitude, obvious variation can take place in the maximum of its electric field strength in half photoperiod, and the deviation between this impulse electric field peak value and the pulse envelope peak value is called carrier envelope phase (CEP).Under different carrier phases, the vibration situation of the laser pulse of identical envelope also has very big difference, and the interaction of itself and material also has marked difference.Therefore, carrier envelope phase is significant effects factor very.
Ultra-intense ultra-short laser pulse provides strong laboratory facilities and research tool for subject research fields such as physics, chemistry and biologies, and CEP is bringing into play conclusive effect in the application facet of ultrashort, super strong laser pulse, as the generation of high order harmonic component and chirped pulse, the ionization of multi-photon and the accurate measurement of optical frequency etc.Especially the generation of high order harmonic component and chirped pulse, birth and development along with Ah second's science, study single chirped pulse and produce and survey the advanced subject that the inner phenomenon of atom has become international laser field, the high order harmonic component that ultrashort, super strong laser pulse drives inert gas generation X ray wave band obtains one of effective means of single chirped pulse just, therefore, obtain pulse duration and be as short as the cycle magnitude, the research of the femtosecond ultrashort laser pulse that CEP is stable becomes the essential condition that promotes that Ah second's science further develops.
Along with the development of ultra-intense ultra-short laser pulse, the requirement of people's pulse-width is more and more higher, and namely pulse duration is cycle, inferior cycle magnitude.This just needs wideer spectral bandwidth to support, but is subjected to the restriction of prior art, and spectrum can not be by unlimited broadening.Relevant synthesizing of light beam is exactly synthetic the light beam of different-waveband, supports few-cycle laser pulse thereby obtain the ultra-wide spectrum bandwidth.It is relevant synthetic that people such as C.Manzoni utilize the light of optical parameter amplification process output to realize, obtained the continuous spectrum (" Ultrabroadband pulse generation bycoherent synthesis of two optical parametric amplifiers " of 500-1000nm, Ultrafast Optics VIII, MontereyCA US, September 26,2011).But when the light of two wave bands did not have lap, " fracture " can appear in relevant synthetic spectrum.The centre wavelength that people such as Shu-Wei Huang adopt Waveform Synthesis Technology that the optical parameter chirped pulse is amplified the output of (OPCPA) process based on relevant wavelength division multiplexing is that the wave band of 0.87um and light that centre wavelength is the wave band of 2.15um synthesize, whole spectrum has been crossed over 1.8 octaves, obtained an inferior cycle nonsine-wave shape that can drive the experiment of high field laser physics (referring to " High-energy pulse synthesis with sub-cyclewaveform control for strong-field physics ", Nature Photonics, Vol.5, Page 475-479, August 2011), because two not stacks of wave band, the spectrum that obtains is not continuous, for obtaining the cycle and even inferior few-cycle laser pulse has brought challenge.And but hollow optic fibre paired pulses spectrum carries out broadening, if we carry out the broadening stack to the stable light beam coupling of the CEP of the different-waveband of energy amplification process output in hollow optic fibre, and then pass through Dispersion Compensation Systems and carry out pulse compression, can obtain the output of the stable cycle with ultra-wide spectrum bandwidth of CEP and even inferior few-cycle laser pulse.
Summary of the invention
The object of the present invention is to provide a kind of wide spectral bandwidth ultrashort laser pulse seed source of carrier envelope stable phase, this device utilizes the stable light source of non-CEP to realize the amplification output of two-way CEP stable light-beam, utilize hollow optic fibre to carry out spectrum widening and compression then, obtain the stable femtosecond ultrashort laser pulse with continuous ultra-wide spectrum bandwidth of CEP, for the ultrafast research field of laser and matter interaction provides necessary light source.
Concrete technical solution of the present invention is as follows:
A kind of wide spectral bandwidth ultrashort laser pulse seed source of carrier envelope stable phase, comprise pumping source, characteristics are its formation: being first beam splitting chip, first lens, white stone, second lens, second beam splitting chip and first speculum successively on the pumping light path of described pumping source output, is the 3rd beam splitting chip and second speculum in the folded light beam direction of described first beam splitting chip successively; Position of intersecting point in the folded light beam direction of the folded light beam direction of described the 3rd beam splitting chip and first speculum is the first optical parameter amplifier; Position of intersecting point in the folded light beam direction of the folded light beam direction of described second speculum and second beam splitting chip is provided with the second optical parameter amplifier; Exporting light direction at the described first optical parameter amplifier is the 3rd speculum, be dichroic mirror at the output light direction of the second optical parameter amplifier and the catoptrical position of intersecting point of the 3rd speculum, along the output light direction of this dichroic mirror successively through second lens, hollow optic fibre and Dispersion Compensation Systems, its course of work is as follows: the pump beam G of pumping source output is divided into transmitted light beam and folded light beam after through first beam splitting chip, described transmitted light beam focuses on to enter through first lens and produces the white light super continuous spectrums in the white stone, the super continuous spectrums that produces focuses on through second lens, super continuous spectrums after the focusing is used as flashlight, be divided into transmission signal light beam and reflected signal light beam through second beam splitting chip, the transmission signal light beam is in first speculum enters nonlinear crystal in the first optical parameter amplifier, and the reflected signal light beam directly enters in the second optical parameter amplifier in the nonlinear crystal; The pump beam of described reflection, be divided into transmission pump beam and reflected pump light bundle through the 3rd beam splitting chip, described reflected pump light bundle directly enters in the first optical parameter amplifier, through the time-delay mechanism in the first optical parameter amplifier and expansion (contracting) bundle device, enter the idle light I of generation that interacts in the first optical parameter amplifier nonlinearity crystal simultaneously with described transmission signal light
I1Described transmission pump beam enters in the second optical parameter amplifier, expand (contracting) bundle device through the time-delay mechanism in the second optical parameter amplifier, enter simultaneously in the second optical parameter amplifier nonlinearity crystal with transmission signal light and to interact, produce idle light I
I2Described idle light beam I
I1Behind the 3rd speculum, with the idle light beam I by the output of the second optical parameter amplifier
I2Close bundle through dichroic mirror together, close Shu Guangjing the 3rd Lens Coupling and enter and carry out spectrum widening in the hollow optic fibre, the dispersion compensating system compresses, and finally exports the stable femtosecond ultrashort laser pulse with ultra-wide spectrum bandwidth of CEP.
Nonlinear crystal in the described first optical parameter amplifier and the second optical parameter amplifier is beta-barium metaborate crystal (BBO), lithium triborate crystal (LBO) or potassium titanyl oxygenic phosphate(KTP) crystal (KTP).
Nonlinear crystal in the described first optical parameter amplifier and the second optical parameter amplifier is bbo crystal, lbo crystal or ktp crystal, and phase matched adopts I class or II class matching technique, and cutting angle is chosen by the coupling angle.
Described hollow optic fibre is the hollow optic fibre that is placed in the inert gas filled sealing device.
Described Dispersion Compensation Systems is chirped mirror or quartz plate.
Advantage of the present invention and innovative point are:
1. this device simplicity of design is easy to operate, and output beam CEP is stable.
2. this device adopts the stable light source of non-CEP, has widely to use.
3. each parameter amplification process is independently in this device, can carry out multi-stage cascade, obtains higher energy and wideer spectral bandwidth.
4. this device utilizes hollow optic fibre that the light of different-waveband is carried out the spectrum widening stack, avoided " fracture " of spectrum, can obtain to have the nearly monocycle magnitude laser pulse of continuous ultra-wide spectrum bandwidth, for the generation of seed source in the extremely ultrafast science provides a kind of new approach.
5. the pulse in this device is closed bundle part based on the Mode Coupling in the hollow optic fibre, has eliminated the effect of jitter that light path directive property etc. causes, and the dual-beam space closes the influence that the space of bundle does not match and shakes, and can obtain better coherent beam combination effect.
Description of drawings
Fig. 1 is the structural representation of the infrared femto-second laser pulse seed source of the wide spectral bandwidth embodiment of the real carrier envelope stable phase of the present invention.
Fig. 2 is the spectrum widening schematic diagram of this femto-second laser pulse seed source system of obtaining in the embodiment of the invention.
Fig. 3 is the impulse electric field envelope schematic diagram after the compression that obtains in the embodiment of the invention.
Embodiment
Below in conjunction with embodiment and accompanying drawing device is further described, but should limit protection scope of the present invention with this.
Please refer to Fig. 1, Fig. 1 is the structural representation of the infrared femto-second laser pulse seed source of the wide spectral bandwidth embodiment of the real carrier envelope stable phase of the present invention.As seen from the figure, the wide spectral bandwidth ultrashort laser pulse seed source embodiment of carrier envelope stable phase of the present invention, comprise pumping source 1, being first beam splitting chip 2, first lens 3, white stone 4, second lens 5, second beam splitting chip 6 and first speculum 7 successively on the pumping light path of described pumping source 1 output, is the 3rd beam splitting chip 8 and second speculum 9 in the folded light beam direction of described first beam splitting chip 2 successively; Position of intersecting point in the folded light beam direction of the folded light beam direction of described the 3rd beam splitting chip 8 and first speculum 7 is the first optical parameter amplifier 10; Position of intersecting point in the folded light beam direction of the folded light beam direction of described second speculum 9 and second beam splitting chip 6 is provided with the second optical parameter amplifier 11; Output light direction at the described first optical parameter amplifier 10 is the 3rd speculum 12, are dichroic mirrors 13 at the output light direction of the second optical parameter amplifier 11 and the catoptrical position of intersecting point of the 3rd speculum 12, along the output light direction of this dichroic mirror 13 successively through the 4th speculum 14, the 5th speculum 15, the 3rd lens 16, hollow optic fibre 17 and Dispersion Compensation Systems 18, the pump beam G of pumping source 1 output is divided into transmitted light beam G[T through first beam splitting chip 2] and folded light beam G[R], this transmitted light beam G[T] 3 focusing enter and produce white light super continuous spectrums WLC in the nonlinear crystal white stone 4 through first lens, control beam density by insertion aperture and adjustable density decay sheet between first beam splitting chip 2 in light path and first lens 3, to produce stable monofilament white light super continuous spectrums WLC, this white light super continuous spectrums WLC focuses on through second lens 5.White light super continuous spectrums WLC after the focusing is used as flashlight, be divided into signal transmitted light beam S[T through second beam splitting chip 6] and signal reflex light beam S[R], this signal transmitted light beam S[T] enter in the first optical parameter amplifier 10 through first speculum 7, described signal reflex light beam S[R] directly enter in the second optical parameter amplifier 11, wherein all include nonlinear crystal in the first optical parameter amplifier 10 and the second optical parameter amplifier 11, the focus of flashlight is all in nonlinear crystal separately.Pump beam G[R through 2 reflections of first beam splitting chip], be divided into transmission pump beam G[RT through the 3rd beam splitting chip 8] and reflected pump light bundle G[RR]: described reflected pump light bundle G[RR] directly enter the first optical parameter amplifier 10, through time-delay mechanism and expansion (contracting) bundle device in the first optical parameter amplifier 10, with described transmission signal light S[T] enter simultaneously in the nonlinear crystal in the first optical parameter amplifier 10; Transmission pump beam G[RT] enter the second optical parameter amplifier 11 through second speculum 9, expand (contracting) bundle device through the time-delay mechanisms in the second optical parameter amplifier 11, with described reflected signal light S[R] enter simultaneously in the second optical parameter amplifier 11 in the nonlinear crystal.Flashlight and pump light interact in the nonlinear crystal in the first optical parameter amplifier and the second optical parameter amplifier respectively, and flashlight is exaggerated and produces idle light I
I1, I
I2, it is stable that the idle light of two bundles that experiment showed, generation is CEP.Idle light beam I
I1, I
I2Carry out light beam by dichroic mirror 13 and close bundle, through the 4th speculum 14, the 5th speculum 15, the 3rd lens 16 are coupled into and carry out spectrum widening in the hollow optic fibre 17, dispersion compensating system 18 compresses again, has finally obtained the stable femtosecond ultrashort laser pulse with continuous ultra-wide spectrum bandwidth of CEP.
Described pump beam G is wavelength 800nm in the present embodiment, repetition rate 1KHz, and energy 4mJ, pulse duration is the laser pulse of 35fs.Described nonlinear crystal is bbo crystal, is of a size of 12mm*12mm*2mm, and phase matched all adopts II class matching technique.First beam splitting chip 2 is 92% for the surface is coated with the 800nm reflectivity, and transmissivity is the eyeglass of 8% rete.Second beam splitting chip 8 is 50% for being coated with the 800nm reflectivity on the surface, and transmissivity is the eyeglass of 50% rete.The 3rd beam splitting chip 6 is 50% for the surface is coated with the super continuous spectrums reflectivity, and transmissivity is the eyeglass of 50% rete.Second speculum 9 has the eyeglass that reflectivity is higher than 99% rete for the surface is coated with to 800nm.First lens 3 are the surperficial lens that are coated with the 800nm anti-reflection film, and second lens 5 are for being coated with the eyeglass to the anti-reflection rete of super continuous spectrums on the surface.Speculum in the described first optical parameter amplifier 10 and the second optical parameter amplifier 11 in time-delay mechanism and expansion (contracting) bundle device is to be coated with on the surface has the eyeglass that reflectivity is higher than 98% rete to 800nm.The 3rd speculum 12 is coated with outgoing beam I for the surface
I1Reflectivity is higher than the eyeglass of 98% rete.Described dichroic mirror 13 is coated with outgoing beam I on the surface
I1Reflectivity is greater than 98%, and to outgoing beam I
I2Transmissivity is greater than the eyeglass of 98% rete.Described the 4th speculum 14, the five speculums 15 are the surface and are coated with light beam I
I1And I
I2Reflectivity is greater than the eyeglass of 98% rete.Described the 3rd lens 16 are coated with light beam I for the surface
I1And I
I2The lens of antireflective coating.Hollow optic fibre 17 is placed in the sealing device, and the inside is filled with argon gas.The light of 18 pairs of different-wavebands of Dispersion Compensation Systems carries out dispersion compensation respectively.
In the present embodiment, by regulating the angle of nonlinear crystal BBO, can realize the phase matched of different wave length, thereby the stable idle light beam of CEP of output different-waveband, through dichroic mirror 13 carry out light beam synthetic after, be coupled into through the 3rd lens 16 and carry out spectrum widening stack in the hollow optic fibre 17, Fig. 2 is the spectrum widening schematic diagram of this femto-second laser pulse seed source system of obtaining in the embodiment of the invention.Dispersion compensating system 18 carries out pulse compression again, and Fig. 3 is the impulse electric field envelope schematic diagram after the compression that obtains in the embodiment of the invention.Thereby can obtain having the nearly monocycle magnitude ultrashort laser pulse of continuous ultra-wide spectrum bandwidth.Because the carrier envelope phase of the idle light of two bundles is stable, the carrier envelope phase of the femto-second laser pulse that obtains also is stable.
Wide spectral bandwidth ultrashort laser pulse seed source by this carrier envelope stable phase, by adopting the stable light source of non-CEP, but on the basis of output two bundle wavelength independent tunings, laser pulse that CEP is stable, utilize hollow optic fibre to carry out spectrum widening stack then and the dispersion compensation technology is carried out pulse compression, we can obtain the femtosecond ultrashort laser pulse seed source of monocycle and even inferior cycle magnitude, for further developing of Ah second's science provides advantage.
Claims (2)
1. the wide spectral bandwidth ultrashort laser pulse seed source of a carrier envelope stable phase, comprise pumping source (1), be characterised in that its formation: being first beam splitting chip (2), first lens (3), white stone (4), second lens (5), second beam splitting chip (6) and first speculum (7) successively on the pumping light path of described pumping source (1) output, is the 3rd beam splitting chip (8) and second speculum (9) in the folded light beam direction of described first beam splitting chip (2) successively; Position of intersecting point in the folded light beam direction of the folded light beam direction of described the 3rd beam splitting chip (8) and first speculum (7) is the first optical parameter amplifier (10); Position of intersecting point in the folded light beam direction of the folded light beam direction of described second speculum (9) and second beam splitting chip (6) is provided with the second optical parameter amplifier (11); Output light direction at the described first optical parameter amplifier (10) is the 3rd speculum (12), be dichroic mirror (13) at the output light direction of the second optical parameter amplifier (11) and the catoptrical position of intersecting point of the 3rd speculum (12), along the output light direction of this dichroic mirror (13) successively through the 3rd lens (16), hollow optic fibre (17) and Dispersion Compensation Systems (18), its course of work is as follows: the pump beam of pumping source (1) output is divided into transmitted light beam and folded light beam two parts after through first beam splitting chip (2), wherein said transmitted light beam focuses on to enter through first lens and produces the white light super continuous spectrums in the white stone, this super continuous spectrums focuses on through second lens (5), super continuous spectrums after the focusing is used as flashlight, be divided into transmission signal light beam and reflected signal light beam through second beam splitting chip (6), this transmission signal light beam is in first speculum (7) enters nonlinear crystal in the first optical parameter amplifier (10), and described reflected signal light beam directly enters in the second optical parameter amplifier (11) in the nonlinear crystal; Described folded light beam, be divided into transmission pump beam and reflected pump light bundle through the 3rd beam splitting chip (8), described reflected pump light bundle directly enters in the first optical parameter amplifier (10), through time-delay mechanism and the scalable bundle device in the first optical parameter amplifier (10), enter simultaneously to interact in the nonlinear crystal of the first optical parameter amplifier (10) with described transmission signal light and produce idle light beam I
I1Described transmission pump beam enters in the second optical parameter amplifier (11), through the scalable bundle device of time-delay mechanism in the second optical parameter amplifier (11), enter simultaneously in the nonlinear crystal of the second optical parameter amplifier (11) with described reflected signal light and to interact, produce idle light beam I
I2Described idle light beam I
I1Behind the 3rd speculum (12), with the idle light beam I by the output of the second optical parameter amplifier (11)
I2Close bundle through dichroic mirror (13) together, closing light behind the bundle is coupled in the hollow optic fibre (17) through the 3rd lens (16) and carries out spectrum widening, light beam dispersion compensating system (18) behind the spectrum widening compresses, and finally exports the stable femtosecond ultrashort laser pulse with ultra-wide spectrum bandwidth of CEP.
2. the wide spectral bandwidth ultrashort laser pulse seed source of carrier envelope stable phase according to claim 1, it is characterized in that the nonlinear crystal in the described first optical parameter amplifier (10) and the second optical parameter amplifier (11) is beta-barium metaborate crystal (BBO), lithium triborate crystal (LBO) or potassium titanyl oxygenic phosphate(KTP) crystal (KTP).
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| CN104218441A (en) * | 2013-05-31 | 2014-12-17 | 中自高科（苏州）光电有限公司 | Ultrafast laser pulse sequence modulation method |
| CN107688167B (en) * | 2016-08-03 | 2020-09-11 | 北京遥感设备研究所 | Multi-time-width linear frequency modulation pulse compression signal amplitude envelope curve generation method |
| CN107086428B (en) * | 2017-06-08 | 2023-06-09 | 中国电子科技集团公司第三十四研究所 | High-peak-power narrow linewidth fiber pulse laser and application method thereof |
| CN109387455B (en) * | 2017-08-04 | 2021-04-13 | 核工业西南物理研究院 | Method and system for measuring wide-area plasma density in real time |
| 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 |
| CN112909724A (en) * | 2021-01-18 | 2021-06-04 | 深圳技术大学 | Pulse amplification device, laser and equipment |
| CN115032806A (en) * | 2022-04-22 | 2022-09-09 | 北京遥测技术研究所 | Multi-wavelength laser beam expanding method and beam expanding system |
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