CN100570464C - The dual wavelength output optical parameter amplifying laser system of carrier envelope stable phase - Google Patents
The dual wavelength output optical parameter amplifying laser system of carrier envelope stable phase Download PDFInfo
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- CN100570464C CN100570464C CNB2008100408674A CN200810040867A CN100570464C CN 100570464 C CN100570464 C CN 100570464C CN B2008100408674 A CNB2008100408674 A CN B2008100408674A CN 200810040867 A CN200810040867 A CN 200810040867A CN 100570464 C CN100570464 C CN 100570464C
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Abstract
A kind of dual wavelength output optical parameter amplifying laser system of carrier envelope stable phase, its characteristics are that the dual wavelength that utilizes parameter to amplify produces, carrying out further energy amplifies, thereby obtain the output of dual wavelength infrared excess short pulse, and the idle intrinsic stable character of CEP of light of utilization, obtain the stable dual wavelength infrared excess short pulse output of CEP, the present invention has simple to operate, be easy to regulate, CEP is stable, tuning range is wide, the advantage of dual wavelength output, the light source widely that provides for Physical Experiments such as chirped pulse generations.
Description
Technical field
The present invention relates to optical parameter amplifying laser system, belong to the ultrashort pulse generating technique.The stable dual wavelength output optical parameter amplifying laser system of particularly a kind of carrier envelope phase (being designated hereinafter simply as CEP).
Background technology
The fast development of femtosecond laser in time decades recently provides practical means and opportunity to develop not seen before for the mankind fully explore the microcosmic ultrafast phenomena and study high field physics.High-octane monocycle impulse and matter interaction can produce tens even the higher hamonic wave on hundreds of rank, and the pulsed light of pumping reaches the cycle during magnitude, can export continuous higher hamonic wave, can obtain single Ah second (10 after the higher hamonic wave compression of continuous spectrum
-18S) pulse can be surveyed the process of motive material force faster, as the electron motion of atom inside.Chirped pulse is the important tool of new subjects such as developing Ah second spectroscopy, Ah second's physics and Ah second's science and technology.
The parameter of pulse is described in the cycle magnitude pulse---carrier envelope phase (CEP) has decisive influence to the non-linear experiment relevant with instantaneous electric field intensity, for example: the generation of higher hamonic wave and chirped pulse.CEP refers to the relative phase between the electric field vibration maximal value under cycle magnitude pulse envelope maximal value and the envelope, and it has determined the instantaneous electric field intensity of pulse.Along with deepening continuously of researchs such as frequency marking surveying and Ah second's science, CEP is provided stable femtosecond laser source, become one of research contents of current forefront.
A.
Realized the self-stabilization of ultrashort laser pulse CEP with regard to the ultimate principle that has proposed to utilize optical parameter to amplify (OPA) as far back as 2002 Deng the people.Studies show that the CEP of flashlight and pump light remains unchanged in amplification process in the OPA process, the CEP of unused light is then relevant with the difference of the former two CEP.Under appropriate condition, promptly when the pump light of OPA had identical CEP with signal pulse, the CEP of the unused light pulse that OPA produces was exactly the phase differential of pump light and flashlight, is constant.So the OPA method is the self-stabilization of light realization pulse CEP entirely.
People such as C.Vozzi are at article " Characterization of a high-energy self-phasestabilizednear-infrared parametric source " (J.Opt.Soc.Am.B/Vol.25, No.7/July 2008) in, seed light is become the silk broadening, produce infrared spectrum by producing different frequency composition (different frequency generation:DFG) then, amplification obtains the stable lasing light emitter of infrared cep through two-stage opa, but because the DFG process has been subjected to becoming the spectral limit of silk broadening, the output laser tunable range is not very wide.
Summary of the invention
The dual wavelength output optical parameter amplifying laser system that the purpose of this invention is to provide a kind of carrier envelope stable phase is for the experiment of laser and matter interaction provides light source widely.
Technical solution of the present invention is as follows:
The dual wavelength output optical parameter amplifying laser system that a kind of CEP is stable, its formation is included on the base plate of instrument, on the direction of advancing along incident beam G, be fixed with first aperture successively, second aperture, first catoptron and first beam splitting chip, incident beam G is divided into transmitted light beam G[t after through first beam splitting chip] and folded light beam G[f], this folded light beam G[f] through being divided into two-beam behind second beam splitting chip, be called anti-printing opacity bundle G[ft] and anti-reflecting light beam G[ff], described anti-reflecting light beam G[ff] through the 3rd aperture, second catoptron, first lens, produce super continuous spectrums WL at white stone, this super continuous spectrums WL is through second lens, the 3rd lens, arrive the first harmonic crystal after the 3rd catoptron and the 4th mirror reflects; Described anti-printing opacity bundle G[ft] through after the 4th lens, half-wave plate, first corner cube mirror, the 5th catoptron and the 6th mirror reflects, converge at simultaneously on the first harmonic crystal with described super continuous spectrums WL, super continuous spectrums WL is at the first harmonic crystal) in by described anti-printing opacity bundle G[ft] pump energy amplifies and to obtain signal beams S, and produce idle light beam I.Described transmitted light beam G[t] through the 7th catoptron, the 8th catoptron, the 9th catoptron, second corner cube mirror, after the beam-shrinked mirror group, be divided into two-beam through the 3rd beam splitting chip, a branch of is transmitted light beam P1, another bundle is folded light beam P2, this transmitted light beam P1 arrives the second harmonic crystal through the 3rd corner cube mirror, signal beams S is through the tenth catoptron, the 5th lens, after the 11 mirror reflects, converge at simultaneously on the second harmonic crystal with transmitted light beam P1, signal beams S obtains signal beams S1 by the amplification of transmitted light beam P1 pump energy in the second harmonic crystal, and produces idle light beam I1; Described folded light beam P2 arrives the third harmonic crystal through the tenth two-mirror, described idle light beam I is after the 13 catoptron, the 6th lens, the 14 mirror reflects, converge at simultaneously on the third harmonic crystal with described folded light beam P2, idle light beam I obtains signal beams S2 by the amplification of folded light beam P2 pump energy in the third harmonic crystal, and producing idle light beam I2, described white stone is positioned at the focus place of first lens.
The working condition of optical parameter amplifying laser system of the present invention is as follows:
The present invention has used first lens that the light beam that is incident on the white stone is focused on.Light beam is by the first lens center normal incidence lens, white stone is positioned at the focus place of first lens, control power density on the white stone by the size of controlling the 3rd aperture, under the situation of monofilament, producing super continuous spectrums, and adopted second lens that super continuous spectrums is collimated.
When super continuous spectrums is located and anti-transmitted light beam G[ft by the 3rd lens center] when being incident in the first harmonic crystal simultaneously, the angle of two light beams satisfies the requirement of the phase matching of crystal, and angle is enough little, can guarantee that two-beam has enough crossing volumes in the first harmonic crystal.When beginning to adjust, adjust the relative position of anti-printing opacity bundle focus and first harmonic crystal, after making the first harmonic crystal be positioned at anti-printing opacity bundle focus, and have enough and to produce the power density that OPA amplifies, control the coincidence degree of two light beams in crystal by adjusting the 6th catoptron, delay device first corner cube mirror of adjusting light path then is to reach aplanatism.At this moment first order OPA has just produced signal beams S and idle light beam I.
Folded light beam P2 is by the beam-shrinked mirror group bundle that contracts, and uses suitable beam-shrinked mirror group to guarantee pump power density the best on the third harmonic crystal; Idle light beam I by the first harmonic crystal after for dispersing output, by the 6th lens it is collimated, by focal length and the idle spot size of light beam I on the third harmonic crystal of position control of controlling the 6th lens, make it and folded light beam P2 size coupling, control the coincidence degree of two light beams in crystal by adjusting the 14 catoptron, delay device second corner cube mirror of adjusting light path then is to reach aplanatism.At this moment second level OPA has just produced signal beams S2 and idle light beam I2.According to the OPA principle, signal beams S2 is the stable light source of CEP.
Transmitted light beam P1 is by the beam-shrinked mirror group bundle that contracts, and uses suitable beam-shrinked mirror group to guarantee pump power density the best on the second harmonic crystal; Signal beams S by the first harmonic crystal after for dispersing output, by the 5th lens it is collimated, by focal length and the spot size of position control signal light beam S on the second harmonic crystal of controlling the 5th lens, make it and transmitted light beam P1 size coupling, control the coincidence degree of two light beams in crystal by adjusting the 11 catoptron, delay device the 3rd corner cube mirror of adjusting light path then is to reach aplanatism.At this moment third level OPA has just produced signal beams S1 and idle light beam I1.According to the OPA principle, idle light beam I1 is the stable light source of CEP.
Described first harmonic crystal, second harmonic crystal, third harmonic crystal are bbo crystals, or lbo crystal, or the KDP crystal; Crystal all cuts according to matching angle.
Described first beam splitting chip is that the transmitance that is coated with incident beam on a substrate equals 92%, and reflectivity equals the lamina membranacea of 8% rete.
Described second beam splitting chip is that the transmitance that is coated with incident beam on a substrate equals 90%, and reflectivity equals the lamina membranacea of 10% rete.
Described the 3rd beam splitting chip is that the transmitance that is coated with incident beam on a substrate equals 50%, and reflectivity equals the lamina membranacea of 50% rete.
Described catoptron first catoptron, second catoptron, the 5th catoptron, the 6th catoptron, the 7th catoptron, the 8th catoptron, the 9th catoptron, first corner cube mirror, second corner cube mirror are coated with on reflecting surface has reflectivity greater than 98% rete to incident beam.
Described the tenth two-mirror, the 3rd corner cube mirror are coated with on reflecting surface has reflectivity greater than 98% to incident beam, and to super continuous spectrums WL transmissivity greater than 98% rete.
Described the 3rd catoptron, the 4th catoptron, the tenth catoptron, the 11 catoptron, the 13 catoptron, the 14 catoptron are coated with on reflecting surface has reflectivity greater than 98% rete to super continuous spectrums WL.
Technique effect of the present invention:
Optical parameter amplifying laser system biggest advantage of the present invention is simple to operate, is easy to regulate, and CEP is stable, and tuning range is wide, dual wavelength output, the light source widely that provides for Physical Experiments such as chirped pulse generations.In prior art, obtain infrared spectrum owing to adopt silk to add the DFG mode, the output wavelength tunable range is narrow, and has only single channel output, the selection of light source when having limited Physical Experiment greatly.Utilize optical parameter amplifying laser system of the present invention, can realize the tuning of wide spectrum, and the stable light source of CEP of two-way separate tunable wavelength can be provided simultaneously, for the light source widely that Physical Experiments such as chirped pulse generation provide is selected.
Description of drawings
Fig. 1 is the structural representation of the dual wavelength output optical parameter amplifying laser system embodiment of carrier envelope stable phase of the present invention.
Fig. 2 exports the wavelength tuning figure of laser I1 for the optical parameter amplifying laser system that records in the embodiment of the invention.
Fig. 3 exports the wavelength tuning figure of laser S2 for the optical parameter amplifying laser system that records in the embodiment of the invention.
The optical parameter amplifying laser system synoptic diagram of Fig. 4 prior art.
Embodiment
The invention will be further described below in conjunction with embodiment and accompanying drawing, but should not limit protection scope of the present invention with this.
See also Fig. 1 earlier, Fig. 1 is the structural representation of the dual wavelength output optical parameter amplifying laser system embodiment of carrier envelope stable phase of the present invention.As seen from the figure, the dual wavelength output optical parameter amplifying laser system of carrier envelope stable phase of the present invention, constitute and be included on the base plate of instrument, on the direction of advancing along incident beam G, be fixed with first aperture 1 successively, second aperture 2, first catoptron 3 and first beam splitting chip 4, incident beam G is divided into transmitted light beam G[t after through first beam splitting chip 4] and folded light beam G[f], this folded light beam G[f] through being divided into two-beam behind second beam splitting chip 5, be called anti-printing opacity bundle G[ft] and anti-reflecting light beam G[ff], described anti-reflecting light beam G[ff] through the 3rd aperture 6, second catoptron 7, first lens 8, produce super continuous spectrums WL at white stone 9, this super continuous spectrums WL is through second lens 10, the 3rd lens 11, the 3rd catoptron 12 and the 4th catoptron 13 backs arrive first harmonic crystal 14; Described anti-printing opacity bundle G[ft] through after the 4th lens 15, half-wave plate 16, first corner cube mirror 17, the 5th catoptron 18 and 19 reflections of the 6th catoptron, converge at simultaneously on the first harmonic crystal 14 with described super continuous spectrums WL, super continuous spectrums WL in first harmonic crystal 14 by described anti-printing opacity bundle G[ft] pump energy amplifies and to obtain signal beams S, and produce idle light beam I.Described transmitted light beam G[t] through the 7th catoptron 20, the 8th catoptron 21, the 9th catoptron 22, second corner cube mirror 23, after the beam-shrinked mirror group 24, be divided into two-beam through the 3rd beam splitting chip 25, a branch of is transmitted light beam P1, another bundle is folded light beam P2, this transmitted light beam P1 arrives second harmonic crystal 27 through the 3rd corner cube mirror 26, signal beams S is through the tenth catoptron 28, the 5th lens 29, the 11 catoptron 30, converge at simultaneously on the second harmonic crystal 27 with transmitted light beam P1, signal beams S obtains signal beams S1 by the amplification of transmitted light beam P1 pump energy in second harmonic crystal 27, and produces idle light beam I1; Described folded light beam P2 arrives third harmonic crystal 32 through the tenth two-mirror 31, described idle light beam I is after the 13 catoptron 33,35 reflections of the 6th lens the 34, the 14 catoptron, converge at simultaneously on the third harmonic crystal 32 with described folded light beam P2, idle light beam I obtains signal beams S2 by the amplification of folded light beam P2 pump energy in third harmonic crystal 32, and producing idle light beam I2, described white stone 9 is positioned at the focus place of first lens 8.
Described in the present embodiment first harmonic crystal 14, second harmonic crystal 27, third harmonic crystal 32 are bbo crystals.Described first beam splitting chip 4 is that the transmitance that is coated with incident beam on a substrate equals 92%, and reflectivity equals the lamina membranacea of 8% rete.Second beam splitting chip 5 is that the transmitance that is coated with incident beam on a substrate equals 90%, and reflectivity equals the lamina membranacea of 10% rete.The 3rd beam splitting chip 25 is that the transmitance that is coated with incident beam on a substrate equals 50%, and reflectivity equals the lamina membranacea of 50% rete.Described first catoptron 3, second catoptron 7, the 5th catoptron 18, the 6th catoptron 19, the 7th catoptron 20, the 8th catoptron 21, the 9th catoptron 22, the first corner cube mirrors 17, second corner cube mirror 23 are coated with on reflecting surface has reflectivity greater than 98% rete to incident beam.Described the tenth two-mirror 31, the 3rd corner cube mirror 26 is coated with on reflecting surface that incident beam is had reflectivity greater than 98%, and to super continuous spectrums WL transmissivity greater than 98% rete.Described the 3rd catoptron 12, the 4th catoptron 13, the tenth catoptron the 28, the 11 catoptron the 30, the 13 catoptron the 33, the 14 catoptron 35 are coated with on reflecting surface has reflectivity greater than 98% rete to super continuous spectrums WL.
Use the structure of optical parameter amplifying laser system as shown in Figure 1.The wavelength X of incident beam G
0=800nm, on the direction of advancing along incident beam G, be fixed with first aperture 1 successively, second aperture 2, first catoptron 3, first beam splitting chip 4, incident beam G is divided into two-beam after through first beam splitting chip 4, and a branch of is transmitted light beam G[t], another bundle is folded light beam G[f], folded light beam G[f] through being divided into two-beam behind second beam splitting chip 5, a branch of is transmitted light beam G[ft], another bundle is folded light beam G[ff], folded light beam G[ff] through the 3rd aperture 6, second catoptron 7, first lens 8 produce super continuous spectrums WL at white stone 9, and super continuous spectrums WL is through second lens 10, the 3rd lens 11, the 3rd catoptron 12, the four catoptrons 13 arrive first harmonic crystal 14; Transmitted light beam G[ft] through the 4th lens 15, half-wave plate 16, the first corner cube mirrors 17, the five catoptrons 18, the 6th catoptron 19 converge on the first harmonic crystal 14 simultaneously with super continuous spectrums WL.Super continuous spectrums WL in first harmonic crystal 14 by transmitted light beam G[ft] pump energy amplifies and to obtain signal beams S, and produce idle light beam I.Transmitted light beam G[t] through the 7th catoptron 20, the 8th catoptron 21, the 9th catoptron 22, second corner cube mirror 23, after the beam-shrinked mirror group 24, be divided into two-beam through the 3rd beam splitting chip 25, a branch of is transmitted light beam P1, and another bundle is folded light beam P2, and transmitted light beam P1 arrives second harmonic crystal 27 through the 3rd corner cube mirror 26, signal beams S is through the tenth catoptron 28, the 5th lens 29, the 11 catoptrons 30 converge on the second harmonic crystal 27 simultaneously with transmitted light beam P1, signal beams S obtains signal beams S1 by the amplification of transmitted light beam P1 pump energy in second harmonic crystal 27, and produces idle light beam I1; Folded light beam P2 arrives third harmonic crystal 32 through the tenth two-mirror 31, idle light beam I is through the 13 catoptron 33, the 6th lens 34, the 14 catoptron 35, converge at simultaneously on the third harmonic crystal 32 with folded light beam P2, idle light beam I obtains signal beams S2 by the amplification of folded light beam P2 pump energy in third harmonic crystal 32, and produces idle light beam I2.
The laser pulse of incident is from the desk-top titanium precious stone laser multiplying arrangement of a cover kHz femtosecond, and this laser aid output energy is 6mJ, and pulse width is the ultrashort intense laser pulse of 40fs.Fig. 2,3 is the tuning figure of optical parameter amplifying laser system output Wavelength of Laser.From Fig. 2,3 as can be seen, the tuning laser of the exportable 1200-2200nm wide region of optical parameter amplifying laser system of the present invention.Through measuring, the CEP of output two-way laser in greater than one hour time the rms value all less than 150mrad.
But we can export the stable infrared pulse of CEP of two-way wavelength independent tuning simultaneously, for the light source widely that Physical Experiments such as chirped pulse generation provide is selected.
Claims (8)
1, a kind of dual wavelength output optical parameter amplifying laser system of carrier envelope stable phase, be characterised in that its formation is included on the base plate of instrument, on the direction of advancing along incident beam G, be fixed with first aperture (1) successively, second aperture (2), first catoptron (3) and first beam splitting chip (4), incident beam G is divided into transmitted light beam G[t after through first beam splitting chip (4)] and folded light beam G[f], this folded light beam G[f] through being divided into two-beam behind second beam splitting chip (5), be called anti-printing opacity bundle G[ft] and anti-reflecting light beam G[ff], described anti-reflecting light beam G[ff] through the 3rd aperture (6), second catoptron (7), first lens (8), produce super continuous spectrums WL at white stone (9), this super continuous spectrums WL is through second lens (10), the 3rd lens (11), the 3rd catoptron (12) and the 4th catoptron (13) back arrive first harmonic crystal (14); Described anti-printing opacity bundle G[ft] through after the 4th lens (15), half-wave plate (16), first corner cube mirror (17), the 5th catoptron (18) and the 6th catoptron (19) reflection, converge at simultaneously on the first harmonic crystal (14) with described super continuous spectrums WL, super continuous spectrums WL in first harmonic crystal (14) by described anti-printing opacity bundle G[ft] pump energy amplifies and to obtain signal beams S, and produce idle light beam I; Described transmitted light beam G[t] through the 7th catoptron (20), the 8th catoptron (21), the 9th catoptron (22), second corner cube mirror (23), after the beam-shrinked mirror group (24), be divided into two-beam through the 3rd beam splitting chip (25), a branch of is transmitted light beam P1, another bundle is folded light beam P2, this transmitted light beam P1 arrives second harmonic crystal (27) through the 3rd corner cube mirror (26), signal beams S is through the tenth catoptron (28), the 5th lens (29), the 11 catoptron (30), converge at simultaneously on the second harmonic crystal (27) with transmitted light beam P1, signal beams S obtains signal beams S1 by the amplification of transmitted light beam P1 pump energy in second harmonic crystal (27), and produces idle light beam I1; Described folded light beam P2 arrives third harmonic crystal (32) through the tenth two-mirror (31), described idle light beam I is after the 13 catoptron (33), the 6th lens (34), the 14 catoptron (35) reflection, converge at simultaneously on the third harmonic crystal (32) with described folded light beam P2, idle light beam I obtains signal beams S2 by the amplification of folded light beam P2 pump energy in third harmonic crystal (32), and producing idle light beam I2, described white stone (9) is positioned at the focus place of first lens (8).
2, the dual wavelength output optical parameter amplifying laser system of carrier envelope stable phase according to claim 1, it is characterized in that described first harmonic crystal (14), second harmonic crystal (27) and third harmonic crystal (32) are bbo crystals, or lbo crystal, or KDP crystal.
3, the dual wavelength output optical parameter amplifying laser system of carrier envelope stable phase according to claim 1, it is characterized in that described first beam splitting chip (4) is that the transmitance that is coated with incident beam on a substrate equals 92%, reflectivity equals the lamina membranacea of 8% rete.
4, the dual wavelength output optical parameter amplifying laser system of carrier envelope stable phase according to claim 1, it is characterized in that described second beam splitting chip (5) is that the transmitance that is coated with incident beam on a substrate equals 90%, reflectivity equals the lamina membranacea of 10% rete.
5, the dual wavelength output optical parameter amplifying laser system of carrier envelope stable phase according to claim 1, it is characterized in that described the 3rd beam splitting chip (25) is that the transmitance that is coated with incident beam on a substrate equals 50%, reflectivity equals the lamina membranacea of 50% rete.
6, the dual wavelength output optical parameter amplifying laser system of carrier envelope stable phase according to claim 1 is characterized in that described first catoptron (3), second catoptron (7), the 5th catoptron (18), the 6th catoptron (19), the 7th catoptron (20), the 8th catoptron (21), the 9th catoptron (22), first corner cube mirror (17) and second corner cube mirror (23) are coated with incident beam is had reflectivity greater than 98% rete on reflecting surface.
7, the dual wavelength output optical parameter amplifying laser system of carrier envelope stable phase according to claim 1, it is characterized in that described the tenth two-mirror (31), the 3rd corner cube mirror (26) is coated with on reflecting surface that incident beam is had reflectivity greater than 98%, and to super continuous spectrums WL transmissivity greater than 98% rete.
8, the dual wavelength output optical parameter amplifying laser system of carrier envelope stable phase according to claim 1 is characterized in that described the 3rd catoptron (12), the 4th catoptron (13), the tenth catoptron (28), the 11 catoptron (30), the 13 catoptron (33) and the 14 catoptron (35) are coated with super continuous spectrums WL is had reflectivity greater than 98% rete on reflecting surface.
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| CN103234643B (en) * | 2013-04-15 | 2015-05-13 | 中国科学院上海光学精密机械研究所 | Method for measuring carrier-envelop phase positions of few-circle femtosecond laser pulses |
| CN103311791B (en) * | 2013-05-15 | 2015-09-16 | 中国科学院上海光学精密机械研究所 | Femtosecond optical parameter amplifier |
| 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 |
| CN108880688A (en) * | 2017-05-11 | 2018-11-23 | 北京遥感设备研究所 | A kind of dual wavelength ultrashort light pulse source based on external modulation technology |
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| US20060078011A1 (en) * | 2004-07-06 | 2006-04-13 | Lucht Robert P | Injection-seeded optical parametric oscillator and system |
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