CN103576411B - Multicolor femto-second laser pulse generation - Google Patents
Multicolor femto-second laser pulse generation Download PDFInfo
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- CN103576411B CN103576411B CN201310419366.8A CN201310419366A CN103576411B CN 103576411 B CN103576411 B CN 103576411B CN 201310419366 A CN201310419366 A CN 201310419366A CN 103576411 B CN103576411 B CN 103576411B
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Abstract
A kind of polychrome femto-second laser pulse generation device, direction of advance along incident laser, it is the first aperture successively, planoconvex spotlight and dichronic mirror, incident laser is divided into transmitted light beam and reflection light beam through described dichronic mirror, along reflection beam direction successively through long pass filter sheet, delayer, second orifice diaphragm and the 3rd high flat reflective silver mirror, incide on non-linear transparent solid medium, described transmitted light beam sequentially passes through chirped mirror, first high flat reflective silver mirror and the second high flat reflective silver mirror, incide on described non-linear transparent medium, the described transmitted light beam and the reflection light beam that incide described non-linear transparent medium have certain angle, delayer described in regulation, two light beams were well overlapped in time and space, thus produce polychrome femto-second laser pulse.Apparatus of the present invention simple in construction, can apply to the different nonlinear leaser spectroscopy researchs such as two-dimension spectrum experiment, high field Laser Experiments and coherent antistockes Raman spectroscopy experiment.
Description
Technical field
The present invention relates to femtosecond laser, particularly a kind of multicolor femto-second laser pulse generation.
Background technology
The research of femtosecond laser and corresponding femtosecond laser technology along with femto-second laser pulse scientific research, biology, medical treatment,
The expansion of the application of the society such as processing, communication, national defence every field develops rapidly with going deep into.One of them is important
The application of aspect be utilize femto-second laser pulse and Femtosecond laser spectroscopy method to study protein, nano material,
Ultra-fast dynamics characteristic in the various types of materials such as semiconductor.Such as, femtosecond pumping-detection technology and femtosecond can be used to be subject to
Swash the research protein structure dynamics such as Raman scattering techniques, semiconductor and nano material carrier dynamics.And two
The polychrome femtosecond pumping-spies such as dimension spectroscopy experiment, high field Laser Experiments and coherent antistockes Raman spectroscopy experiment
Survey experiment, need two and the femto-second laser pulse of above different frequency.Therefore, many safis of a kind of simple in construction
Second laser generator is significant.At present, polychrome femtosecond laser is mainly by two bundle different frequencies
Femtosecond laser beam produces non-linear solid dielectric cascade four-wave mixing (CFWM) with certain angle.
Summary of the invention
It is an object of the invention to provide a kind of polychrome femto-second laser pulse generation device, this apparatus structure is simple, and
And modularization, can apply to two-dimension spectrum experiment, high field Laser Experiments and coherent antistockes Raman spectroscopy
Learn the different nonlinear leaser spectroscopy researchs such as experiment.
The technical solution of the present invention is as follows:
A kind of multicolor femto-second laser pulse generation, feature is that its composition includes: along the direction of the advance of incident laser,
Being the first aperture, planoconvex spotlight and dichronic mirror successively, incident laser is divided into transmitted light beam through described dichronic mirror
With reflection light beam, reflection beam direction in edge is high through long pass filter sheet, delayer, second orifice diaphragm and the 3rd successively
Flat reflective silver mirror, incides on non-linear transparent solid medium, described transmitted light beam sequentially pass through chirped mirror,
One high flat reflective silver mirror and the second high flat reflective silver mirror, incide on described non-linear transparent medium, incide institute
The described transmitted light beam of the non-linear transparent medium stated and reflection light beam have certain angle, the time delay described in regulation
Device so that two light beams well overlapped in time and space, thus produce polychrome femto-second laser pulse.
Described delayer is for be made up of with being positioned at same translation stage at the same time two pieces high flat reflective silver mirrors.
First, this device is that the index path of this device is as it is shown in figure 1, edge is incident based on cascade four-wave mixing principle
The direction that laser 1 advances, is followed successively by aperture 2, planoconvex spotlight 3 and dichronic mirror 4, and incoming laser beam is at dichronic mirror
Being divided into two-way, a road, through dichroic mirror, passes sequentially through long pass filter sheet 13, delayer 14(dotted line frame:
Wherein delayer is to be made up of two pieces high flat reflective silver mirrors 5,6 and translation stage), aperture 15 and high flat reflective silver mirror 9,
Inciding on non-linear transparent solid medium 11, another bundle, through dichronic mirror, sequentially passes through chirped mirror 10, Gao Ping
Reflection silver mirror 7 and 8, last and dichroic mirror light beam coincides with on non-linear transparent medium 11 with certain angle,
Regulation delayer so that two light beams well overlapped in time and space, thus produced polychrome femto-second laser pulse,
Measure spectrum is received by the spectrometer 12 being positioned at below.
In apparatus structure, aperture 2 and aperture 15 are easy for regulating light path.The focal length of planoconvex spotlight 3 is root
The whole light path incided on non-linear transparent medium 11 according to two-way light beam selects so that the two-way light hot spot of coincidence
It is positioned near focal point.Dichronic mirror is that the wave band according to incoming laser beam 1 selects, and is mainly divided into by incident beam
The light beam of long and short two wave band.The selection of long pass filter sheet, depend on through dichronic mirror 4 reflect the wave band of light light beam with
And need the heterogeneous light centre frequency produced below.The temporal resolution of delayer 14 is by the translation precision of translation stage
Determining, the pulsewidth of two light beams is depended in the selection of its temporal resolution.Chirped mirror is for compensating the positive Zhou of incident beam
Singing, so that short-wave band laser pulse is warbled for negative, light order of reflection between chirped mirror is by the positive Zhou of incident light
The chromatic dispersion compensation quantity parameter of the amount of singing and chirped mirror determines.5,6,7,8,9 is the plane reflection with high reflectance
Mirror, or silver mirror, or aluminium mirror, it is also possible to be dielectric mirror, by the center of incident light in specific experiment
Frequency determines, selects the plane mirror that corresponding reflectivity is the highest.Non-linear transparent medium 11 can be that BBO is brilliant
Body, Sapphire, Fused silica, CaF2Etc. non-linear transparent medium, to non-linear transparent dielectric material in experiment
The selection of 11 requires material on incident laser-light transparent, and third-order nonlinear optical coefficient wants height, and thickness wants suitable.Spectrum
Instrument 12 can select the spectrometer of EO-1 hyperion precision, for improving certainty of measurement and measuring the polychromatic light light of all levels time
Spectrum.
Fixing long-wave band light beam, by regulating high flat reflector 7 and 8 so that short-wave band light beam and long-wave band light beam
Spatially well coincide with long-wave band light beam on non-linear transparent medium 11, regulate delayer so that two light
Bundle overlaps the most to greatest extent, this creates the terminal 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 the polychromatic light spectrum of the most at the same level time one by one.Value
Obtain it is noted that regulate high flat reflector 7 and 8, thus it is possible to vary the angle between long and short wave band two light beams,
Thus play the effect of tuning.
The present invention has a following outstanding feature:
A () present invention is a modular polychromatic light generation device, can be directly by changing different dichronic mirror with anti-
Penetrate mirror and carry out adjusting means so that device is applicable to the incident laser pulse of different-waveband.
B () this invention apparatus structure is simple, just with several pieces of speculums, one piece of dichronic mirror and a pair chirped mirror,
Just create the femto-second laser pulse of multiple color.
C in () this device, the energy range for incident laser pulse can be very big, because different materials can be selected
The non-linear transparent medium of different-thickness, selects suitable material and the non-linear transparent medium of thickness, it is possible to obtain relatively
High-energy, pulsewidth is less than the Multi Colour Lasers pulse of 10 femtoseconds.
D, in () apparatus of the present invention, chirped mirror is to the compensating action with the incident light just warbled so that short-wave band light
Bundle is warbled for negative, and long-wave band is not through chirp compensation, inherently for just to warble, the frequency so produced turns
Change light just to warble with a certain amount of bearing, just its pulsewidth can be compressed by sheet glass.
E (), by controlling incident light energy, pulsewidth and the thickness of non-linear transparent medium, can reach to control to produce
The energy of Multi Colour Lasers pulse and pulsewidth.
Accompanying drawing explanation
Fig. 1 is the light channel structure figure of multicolor femto-second laser pulse generation 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 is to utilize apparatus of the present invention, is 640-910nm at incident light wave band, short-wave band light beam chirped mirror it
Between roundtrip 4 times, long-wave band and short-wave band light beam with angle as θ=4.09 ° coincide with thickness as 2.0mm
On Sapphire crystal, produced polychrome femto-second laser pulse.
Fig. 6 is to utilize apparatus of the present invention, constant in other conditions, and it is 0.15mm that non-linear transparent medium is changed to thickness
Sapphire crystal, produced polychrome femto-second laser pulse.
Detailed description of the invention
First refer to the light channel structure figure that Fig. 1, Fig. 1 are multicolor femto-second laser pulse generation embodiment of the present invention.By
Scheme visible, multicolor femto-second laser pulse generation of the present invention, including: along the direction of the advance of incident laser 1, successively
Being the first aperture 2, planoconvex spotlight 3 and dichronic mirror 4, incident laser is divided into transmission light through described dichronic mirror 4
Bundle and reflection light beam, along reflection beam direction successively through long pass filter sheet 13, delayer 14, second orifice diaphragm
15 and the 3rd high flat reflective silver mirror 9, incide on non-linear transparent solid medium 11, described transmitted light beam is successively
Through chirped mirror the 10, first high flat reflective silver mirror 7 and the second high flat reflective silver mirror 8, incide described non-linear
On transparent medium 11, incide described transmitted light beam and the reflection light beam tool of described non-linear transparent medium 11
There is certain angle, the delayer described in regulation so that two light beams well overlapped in time and space, thus produced
Polychrome femto-second laser pulse.Described delayer 14 is by two pieces high flat reflective silver mirrors 5,6 and to be positioned at same at the same time
One translation stage is constituted.
To by the incoming laser beam 1 after hollow optic fibre broadening, dichronic mirror 4 it is divided into two-way, creates the most at the same level
Secondary polychrome femto-second laser pulse.In the light path of the present embodiment, the incoming laser beam 1 that Optical Maser System produces
Centre wavelength is 800nm, and repetition rate is 1kHz, and pulsewidth is that the laser beam of 40fs is by being filled with 1 atmospheric pressure
After the hollow optic fibre broadening of argon gas, spectral region broadening has become 610--910nm(as shown in Figure 2), entering after broadening
Penetrating laser beam 1 and sequentially pass through aperture 2, focal length is the planoconvex spotlight 3 of f=50cm, then through cutoff wavelength is
The reflection of the dichronic mirror 4 of 805nm and transmission, divide into two-way light beam.Through a road light beam of dichronic mirror 4 reflection,
By the long pass filter sheet 13 that cutoff wavelength is 800nm, its spectrum be 790--910nm(as shown in Figure 4), energy
Amount is 6.6 μ J, and elapsed time resolution ratio is the delayer 14 of 3fs, then through high flat reflective silver mirror 9, incides non-thread
On property transparent medium 11, another road light beam through dichronic mirror transmission, spectrum be 610--805nm(as shown in Figure 3),
Energy is 7.0 μ J, is-40fs through chirp parameter2Chirped mirror 10 roundtrip 4 times so that light beam is with one
Quantitatively negative is warbled, more also incides on non-linear transparent medium 11 through too high flat reflective silver mirror 7 and 8.Two-way light
Bundle last with angle as θ=4.09 °, coincide with on non-linear transparent medium 11, regulate high flat reflective silver mirror 7 and 8,
Two-way light beam is overlapped the most to greatest extent, regulates delayer 14 so that two-way light beam is the most very
Good coincidence, owing to cascade four-wave mixing (CFWM) process in medium is just after non-linear transparent medium 11,
Obtain different wave length, the polychrome femto-second laser pulse of different colours.Non-linear transparent medium in the implementation case
The Sapphire crystal that 11 had used thickness to be 2.0mm before this, the experimental result obtained is as it is shown in figure 5, in Fig. 5 (a)
Figure as1 is the spectrogram changing light on the primary frequency recorded, and (b) figure as2 is conversion light on the Second Level Frequency recorded
Spectrum.For spectrum spectrum width, two-stage time spectrum carries out Fourier's limit conversion, has all reached below 10fs.
Fig. 6 is as the experimental result obtained by non-linear transparent medium with the Sapphire crystal that thickness is 0.15mm.
In Fig. 6, (a) figure as1 is the spectrogram changing light on the primary frequency recorded, and (b) figure as2 is two grades recorded
The spectrogram of frequency upooaversion light.From the point of view of spectral shape, chirp value is bigger, but heterogeneous light Fu produced
In leaf limit conversion pulsewidth less than 10fs.In conjunction with Fig. 3 and Fig. 4, it is seen then that select the nonlinear material of suitable thickness,
Light beam is carried out suitable chirp compensation and can be obtained by narrow spaces (less than 10fs), the height of higher-energy (μ J magnitude)
This type Multi Colour Lasers pulse.
Claims (2)
1. a multicolor femto-second laser pulse generation, is characterised by that its composition includes: before incident laser (1)
The direction entered, is the first aperture (2) diaphragm, planoconvex spotlight (3) and dichronic mirror (4), incident laser warp successively
Described dichronic mirror (4) is divided into transmitted light beam and reflection light beam, along reflection beam direction successively through long pass filter sheet
(13), delayer (14), second orifice diaphragm (15) and the 3rd high flat reflective silver mirror (9), incide non-thread
Property transparent solid medium (11) on, described transmitted light beam sequentially passes through chirped mirror (10), the first high flat reflective silver
Mirror (7) and the second high flat reflective silver mirror (8), incide on described non-linear transparent medium (11), incide
The described transmitted light beam of described non-linear transparent medium (11) and reflection light beam have certain angle, regulate institute
The delayer stated so that two light beams well overlapped in time and space, thus produce polychrome femto-second laser pulse.
Multicolor femto-second laser pulse generation the most according to claim 1, it is characterised in that described delayer
(14) for by two pieces high flat reflective silver mirrors (5,6) be positioned at same translation stage at the same time and constitute.
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| 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 |
| 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 |
| CN110908128B (en) * | 2019-11-08 | 2021-09-07 | 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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| CN101211088A (en) * | 2006-12-28 | 2008-07-02 | 中国科学院西安光学精密机械研究所 | Single crystal tunable broadband non-collinear femtosecond optical parametric amplification method and device |
| CN203535349U (en) * | 2013-09-13 | 2014-04-09 | 中国科学院上海光学精密机械研究所 | Multicolor femtosecond laser generating device |
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| CN101211088A (en) * | 2006-12-28 | 2008-07-02 | 中国科学院西安光学精密机械研究所 | Single crystal tunable broadband non-collinear femtosecond optical parametric amplification method and device |
| CN203535349U (en) * | 2013-09-13 | 2014-04-09 | 中国科学院上海光学精密机械研究所 | Multicolor femtosecond laser generating device |
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