CN103576411A - Multicolor femto-second laser pulse generation device - Google Patents
Multicolor femto-second laser pulse generation device Download PDFInfo
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- CN103576411A CN103576411A CN201310419366.8A CN201310419366A CN103576411A CN 103576411 A CN103576411 A CN 103576411A CN 201310419366 A CN201310419366 A CN 201310419366A CN 103576411 A CN103576411 A CN 103576411A
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Abstract
A multicolor femto-second laser pulse generation device comprises a first aperture diaphragm, a plano-convex lens and a dichroic mirror in sequence in the forward direction of incident laser; the incident laser is divided into a transmitted beam and a reflected beam by the dichroic mirror, the reflected beam sequentially passes a long-pass filter plate, a chronotron, a second aperture diaphragm and a third high-parallelism reflection silver mirror to be incident on a nonlinear transparent solid medium; the transmitted beam sequentially passes a chirp mirror, a first high-parallelism reflection silver mirror and a second high-parallelism reflection silver mirror to be incident on a nonlinear transparent medium; a certain included angle is formed between the reflected beam and the transmitted beam incident on the nonlinear transparent medium; the chronotron is adjusted to enable the two beams to well coincide in time and space, so that a multicolor femto-second laser pulse can be generated. The device provided by the invention is simple in structure, can be applied to two-dimensional spectroscopy experiments, high-field laser experiments, coherence anti-Stokes Raman spectroscopy experiments and other different nonlinear laser spectroscopy research.
Description
Technical field
The present invention relates to femtosecond laser, particularly a kind of polychrome femtosecond laser generating device.
Background technology
The research of femtosecond laser and corresponding femtosecond laser technology is along with the expansion of femto-second laser pulse in the application of the social every field such as scientific research, biology, medical treatment, processing, communication, national defence develops rapidly with going deep into.The application of one of them importance is to utilize femto-second laser pulse and Femtosecond laser spectroscopy method to carry out Study on Protein, nano material, the ultrafast dynamics in the various types of materials such as semiconductor.Such as, can adopt Study on Protein Structural Dynamics, semiconductor and the nano material charge carrier dynamics such as femtosecond pumping-detection technology and femtosecond stimulated Raman scattering technology.And two-dimension spectrum is learned experiment, high field Laser Experiments and coherent antistockes Raman spectroscopy and is learned the polychrome femtosecond pumping-detection experiments such as experiment, need to two and the femto-second laser pulse of above different frequency.Therefore, a kind of polychrome femtosecond laser generating device simple in structure is significant.At present, polychrome femtosecond laser is mainly to utilize the femtosecond laser beam of two bundle different frequencies to produce in non-linear solid dielectric cascade four-wave mixing (CFWM) with certain angle.
Summary of the invention
The object of the present invention is to provide a kind of polychrome femto-second laser pulse generation device, this apparatus structure is simple, and modularization, can be applied to two-dimension spectrum and learn the different nonlinear leaser spectroscopy researchs such as experiment, high field Laser Experiments and coherent antistockes Raman spectroscopy experiment.
Technical solution of the present invention is as follows:
A kind of polychrome femtosecond laser generating device, feature is that its formation comprises: along the direction of advancing of incident laser, the first aperture successively, plano-convex lens and dichronic mirror, incident laser is divided into transmitted light beam and folded light beam through described dichronic mirror, along folded light beam direction successively through long pass filter sheet, chronotron, the flat reflection silver mirror of second orifice diaphragm and third high, incide on non-linear transparent solid medium, described transmitted light beam passes through chirped mirror successively, the first high flat reflection silver mirror and the second high flat reflection silver mirror, incide on described non-linear transparent medium, the described transmitted light beam and the folded light beam that incide described non-linear transparent medium have certain angle, regulate described chronotron, two light beams were well overlapped in time and space, thereby produce polychrome femto-second laser pulse.
Described chronotron for by two high flat reflection silver mirrors be positioned at same translation stage at the same time and form.
First, this device is based on cascade four-wave mixing principle, the index path of this device as shown in Figure 1, the direction of advancing along incident laser 1, be followed successively by aperture 2, plano-convex lens 3 and dichronic mirror 4, incoming laser beam is punished into two-way at dichronic mirror, one tunnel is through dichronic mirror reflection, successively by long pass filter sheet 13, chronotron 14(dotted line frame: wherein chronotron is by two high flat reflection silver mirrors 5, 6 form with translation stage), aperture 15 and Gao Ping reflection silver mirror 9, incide on non-linear transparent solid medium 11, another bundle sees through dichronic mirror, pass through successively chirped mirror 10, high flat reflection silver mirror 7 and 8, last and dichronic mirror folded light beam coincides with on non-linear transparent medium 11 with certain angle, regulate chronotron, two light beams were well overlapped in time and space, thereby produce polychrome femto-second laser pulse, , the spectrometer 12 being positioned at below receives measure spectrum.
In apparatus structure, aperture 2 and aperture 15 are convenient to regulate light path to use.The focal length of plano-convex lens 3 is that the whole light path inciding on non-linear transparent medium 11 according to two-way light beam is selected, and the two-way light hot spot overlapping is positioned near focus.Dichronic mirror is to select according to the wave band of incoming laser beam 1, is mainly incident beam to be divided into the light beam of a long and short two wave band.The selection of long pass filter sheet, depends on through the wave band of dichronic mirror 4 reflected light light beams and the heterogeneous light centre frequency that needs generation below.The temporal resolution of chronotron 14 determines by the translation precision of translation stage, and the pulsewidth of two light beams is depended in the selection of its temporal resolution.Chirped mirror is for compensating just warbling of incident beam, so that short-wave band laser pulse is warbled for negative, the order of reflection of light between chirped mirror determined by the positive chirp value of incident light and the chromatic dispersion compensation quantity parameter of chirped mirror.5,6,7,8,9 for having the plane mirror of high reflectance, or silver mirror, or aluminium mirror, can be also dielectric mirror, and the centre frequency by incident light in specific experiment determines, selects the highest plane mirror of corresponding reflectivity.Non-linear transparent medium 11 can be bbo crystal, Sapphire, Fused silica, CaF
2etc. non-linear transparent medium, in experiment, to the selection of non-linear transparent dielectric material 11, require material transparent to incident laser, it is high that third-order non-linear coefficient is wanted, and thickness is suitable.Spectrometer 12 can be selected the spectrometer of high spectral accuracy, for improving measuring accuracy and measuring the inferior polychromatic light spectrum of all levels.
Fixed length wave band light beam, by regulating high flat reflector 7 and 8, short-wave band light beam and long-wave band light beam are spatially well coincided with on non-linear transparent medium 11 with long-wave band light beam, regulate chronotron, two light beams are overlapped in time to greatest extent, so just produced the femto-second laser pulse of multiple color limpid in sight.Translation is positioned at the spectrometer 12 after non-linear transparent medium 11, measures one by one the polychromatic light spectrum of not at the same level time.It should be noted that and regulate high flat reflector 7 and 8, can change the angle between long and short wave band two light beams, thereby play tuning effect.
The present invention has following outstanding feature:
(a) the present invention is a modular polychromatic light generation device, can directly by changing different dichronic mirrors and catoptron, carry out regulating device, makes device be applicable to the incident laser pulse of different-waveband.
(b) this contrive equipment is simple in structure, only utilizes several catoptrons, a dichronic mirror and a pair of chirped mirror, has just produced the femto-second laser pulse of a plurality of colors.
(c) in this device, the energy range for incident laser pulse can be very large, because can select the non-linear transparent medium of different materials different-thickness, the non-linear transparent medium of selecting suitable material and thickness, can obtain higher-energy, and pulsewidth is less than the Multi Colour Lasers pulse of 10 femtoseconds.
(d) in apparatus of the present invention, the compensating action of chirped mirror to the incident light with just warbling, short-wave band light beam is warbled for negative, and long-wave band is not passed through chirp compensation, itself is just for just warbling, in the frequency producing like this, change light just with a certain amount of negative warbling, by glass sheet, just can compress its pulsewidth.
(e) by controlling the thickness of incident light energy, pulsewidth and non-linear transparent medium, can reach energy and the pulsewidth of controlling the Multi Colour Lasers pulse producing.
Accompanying drawing explanation
Fig. 1 is the light channel structure figure of polychrome femtosecond laser generating device embodiment of the present invention.
Fig. 2 is the incident light spectrogram of the present embodiment.
Fig. 3 is short-wave band spectrogram.
Fig. 4 is long-wave band spectrogram.
Fig. 5 utilizes apparatus of the present invention, at incident light wave band, be 640-910nm, short-wave band light beam carrys out back reflective 4 times between chirped mirror, and long-wave band and short-wave band light beam be take angle as θ=4.09 ° coincide with on the Sapphire crystal that thickness is 2.0mm, the polychrome femto-second laser pulse producing.
Fig. 6 utilizes apparatus of the present invention, constant in other conditions, and non-linear transparent medium is changed to the Sapphire crystal that thickness is 0.15mm, the polychrome femto-second laser pulse producing.
Embodiment
First refer to Fig. 1, Fig. 1 is the light channel structure figure of polychrome femtosecond laser generating device embodiment of the present invention.As seen from the figure, polychrome femtosecond laser generating device of the present invention, comprise: along the direction of advancing of incident laser 1, the first aperture 2 successively, plano-convex lens 3 and dichronic mirror 4, incident laser is divided into transmitted light beam and folded light beam through described dichronic mirror 4, along folded light beam direction successively through long pass filter sheet 13, chronotron 14, the flat reflection silver mirror 9 of second orifice diaphragm 15 and third high, incide on non-linear transparent solid medium 11, described transmitted light beam passes through chirped mirror 10 successively, the first high flat reflection silver mirror 7 and the second high flat reflection silver mirror 8, incide on described non-linear transparent medium 11, the described transmitted light beam and the folded light beam that incide described non-linear transparent medium 11 have certain angle, regulate described chronotron, two light beams were well overlapped in time and space, thereby produce polychrome femto-second laser pulse.Described chronotron 14 is for by two high flat reflection silver mirrors 5,6 and be positioned at the same time same translation stage and form.
To by the incoming laser beam 1 after hollow optic fibre broadening, by dichronic mirror 4, be divided into two-way, produced the polychrome femto-second laser pulse of not at the same level time.In the light path of the present embodiment, the centre wavelength of the incoming laser beam 1 that Optical Maser System produces is 800nm, repetition frequency is 1kHz, pulsewidth is that the laser beam of 40fs is by being filled with after the hollow optic fibre broadening of 1 atmospheric pressure argon gas, spectral range broadening has become 610--910nm(as shown in Figure 2), the incoming laser beam 1 after broadening passes through aperture 2 successively, the plano-convex lens 3 that focal length is f=50cm, reflection and the transmission of the dichronic mirror 4 that is 805nm through cutoff wavelength again, be divided into two-way light beam.Through dichronic mirror 4 reflection Yi road light beams, the long pass filter sheet 13 that is 800nm by cutoff wavelength, its spectrum be 790--910nm(as shown in Figure 4), energy is 6.6 μ J, the chronotron 14 that elapsed time resolution is 3fs, again through the flat reflection silver mirror 9 of height, incide on non-linear transparent medium 11, another road light beam is through dichronic mirror transmission, spectrum be 610--805nm(as shown in Figure 3), energy is 7.0 μ J, through chirp parameter, is-40fs
2chirped mirror 10 carry out back reflective 4 times, make light beam with a certain amount of negative warbling, then penetrate silver mirror 7 and 8 and also incide on non-linear transparent medium 11 through too high redressing.Two-way light beam finally be take angle as θ=4.09 °, coincide with on non-linear transparent medium 11, regulate high flat reflection silver mirror 7 and 8, two-way light beam is spatially overlapped to greatest extent, regulate chronotron 14, two-way light beam is well overlapped in time, because cascade four-wave mixing (CFWM) process in medium is just after non-linear transparent medium 11, obtained different wave length, the polychrome femto-second laser pulse of different colours.In the implementation case, non-linear transparent medium 11 had been used the Sapphire crystal that thickness is 2.0mm before this, the experimental result obtaining as shown in Figure 5, in Fig. 5, (a) figure as1 changes the spectrogram of light in the one-level frequency recording, and (b) figure as2 changes the spectrum of light in the secondary frequency recording.From spectrum spectrum width, two-stage time spectrum carries out the conversion of Fourier's limit, has all reached below 10fs.The Sapphire crystal that Fig. 6 is is 0.15mm with thickness is as the resulting experimental result of non-linear transparent medium.In Fig. 6, (a) figure as1 changes the spectrogram of light in the one-level frequency recording, and (b) figure as2 changes the spectrogram of light in the secondary frequency recording.From spectral shape, chirp value is larger, but the heterogeneous light Fourier's limit conversion pulsewidth producing is less than 10fs.In conjunction with Fig. 3 and Fig. 4, visible, the nonlinear material of selection suitable thickness, carries out to light beam the Gaussian Multi Colour Lasers pulse that suitable chirp compensation just can obtain narrow pulsewidth (being less than 10fs), higher-energy (μ J magnitude).
Claims (2)
1. a polychrome femtosecond laser generating device, be characterised in that its formation comprises: along the direction of advancing of incident laser (1), the first aperture (2) diaphragm successively, plano-convex lens (3) and dichronic mirror (4), incident laser is divided into transmitted light beam and folded light beam through described dichronic mirror (4), along folded light beam direction successively through long pass filter sheet (13), chronotron (14), second orifice diaphragm (15) and the flat reflection silver mirror of third high (9), incide on non-linear transparent solid medium (11), described transmitted light beam passes through chirped mirror (10) successively, the first high flat reflection silver mirror (7) and the second high flat reflection silver mirror (8), incide on described non-linear transparent medium (11), the described transmitted light beam and the folded light beam that incide described non-linear transparent medium (11) have certain angle, regulate described chronotron, two light beams were well overlapped in time and space, thereby produce polychrome femto-second laser pulse.
2. polychrome femtosecond laser generating device according to claim 1, is characterized in that described chronotron (14) is by two high flat reflection silver mirrors (5,6) and is positioned at the same time same translation stage formation.
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Cited By (4)
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| CN104112976A (en) * | 2014-07-22 | 2014-10-22 | 中国科学院上海光学精密机械研究所 | White light generation based multi-color femtosecond laser generation device |
| CN104570544A (en) * | 2015-01-04 | 2015-04-29 | 中国科学院上海光学精密机械研究所 | Multi-color femtosecond laser generating device based on air filamentation |
| CN104914645A (en) * | 2015-06-30 | 2015-09-16 | 中国科学院上海光学精密机械研究所 | Multi-color femtosecond laser generating device |
| CN110908128A (en) * | 2019-11-08 | 2020-03-24 | 中国科学院上海光学精密机械研究所 | Multicolor ultrafast laser generating device |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104112976A (en) * | 2014-07-22 | 2014-10-22 | 中国科学院上海光学精密机械研究所 | White light generation based multi-color femtosecond laser generation device |
| CN104112976B (en) * | 2014-07-22 | 2018-01-12 | 中国科学院上海光学精密机械研究所 | Based on multicolor femto-second laser pulse generation caused by white light |
| CN104570544A (en) * | 2015-01-04 | 2015-04-29 | 中国科学院上海光学精密机械研究所 | Multi-color femtosecond laser generating device based on air filamentation |
| CN104570544B (en) * | 2015-01-04 | 2017-07-14 | 中国科学院上海光学精密机械研究所 | Based on air into silk multicolor femto-second laser pulse generation |
| CN104914645A (en) * | 2015-06-30 | 2015-09-16 | 中国科学院上海光学精密机械研究所 | Multi-color femtosecond laser generating device |
| CN104914645B (en) * | 2015-06-30 | 2018-02-13 | 中国科学院上海光学精密机械研究所 | Multicolor femto-second laser pulse generation |
| CN110908128A (en) * | 2019-11-08 | 2020-03-24 | 中国科学院上海光学精密机械研究所 | Multicolor ultrafast laser generating device |
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