CN102169021B - Frequency resolution optical switch method measuring device - Google Patents
Frequency resolution optical switch method measuring device Download PDFInfo
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- CN102169021B CN102169021B CN2010106205011A CN201010620501A CN102169021B CN 102169021 B CN102169021 B CN 102169021B CN 2010106205011 A CN2010106205011 A CN 2010106205011A CN 201010620501 A CN201010620501 A CN 201010620501A CN 102169021 B CN102169021 B CN 102169021B
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Abstract
The invention belongs to the technical field of laser parameter measurement, and discloses a frequency-resolved optical switching method measuring device which comprises a light splitting plate, a cylindrical lens, a first reflecting mirror, a second reflecting mirror, a third reflecting mirror, a nonlinear medium, a light barrier, a spectrometer and a computer provided with an FROG iteration program. Wherein the nonlinear medium adopts a medium sheet which is transparent to ultraviolet light. The device can be suitable for single ultraviolet ultrashort pulse laser frequency resolution optical switch method measurement.
Description
Technical field
The invention belongs to the laser parameter measurement technical field, be specifically related to the device that a kind of frequency resolution optical shoulder rotation (Frequency-Resolved-Optical-Gating is called for short FROG) is measured the ultra-short pulse laser parameter.
Background technology
FROG is a strong instrument of measuring ultra-short pulse laser; Its principle is that autocorrelation function analyzer and spectrometer are combined; Obtain the two-dimentional spectrogram of time domain-frequency domain quadrature, utilize the computer iterations algorithm to restore the information such as waveform, spectrum, phase place, pulsewidth, bandwidth of laser pulse again.According to document
" Frequency-Resolved-Optical-Grating:The Measurement of Ultrashort Laser Pulses; Rick Trebino; 2000 Kluwer Academic Publishers " report; At present development abroad FROG measuring systems such as the method for quadratic harmonics, third harmonic method, self-diffraction method, polarization method, transient grating diffraction approach, wherein the method for quadratic harmonics is commonplace, and has formed product.Domesticly also carried out relevant research, but major part concentrates on the method for quadratic harmonics FROG Research on Measurement System.
Method of quadratic harmonics FROG system energy measurement is visible, the infrared excess short pulse, but can't measure ultraviolet ultrashort-pulse, in default of the frequency-doubling crystal from the ultraviolet to the deep ultraviolet.Simultaneously, method of quadratic harmonics FROG system majority concentrates on ultra-short pulse laser how to measure repetition frequency, and the ultra-short pulse laser for can only single emission just need design light path again.
Summary of the invention
(1) goal of the invention
Two defectives to second harmonic FROG system prior art: the one, energy measurement ultraviolet pulse not; The 2nd, energy measurement single pulse not, the present invention provides a kind of single ultraviolet ultrashort-pulse laser frequency resolution optical shoulder rotation measurement mechanism that utilizes the design of transient grating diffraction approach.
(2) technical scheme
For realizing above-mentioned purpose, the present invention provides following technical scheme:
A kind of frequency resolution optical shoulder rotation measurement mechanism comprises beam-splitter, post lens, first catoptron, second catoptron, the 3rd catoptron, nonlinear medium, light barrier, spectrometer and is furnished with the computing machine of FROG iterative program.
Said beam-splitter is on one flat plate, to dig out three identical rectangular openings, and three rectangular openings are centered close on foursquare three summits, and beam-splitter is divided into parallel three beams with incident laser, and wherein two bundles are as switch light, a branch of as surveying light;
Said post lens focus on the three-beam of telling, and focal line is on nonlinear medium;
Said first catoptron, second catoptron, the 3rd catoptron are positioned in the middle of post lens and the nonlinear medium, and second catoptron and the 3rd catoptron are compact to be placed, and the minute surface normal has 7～8 degree angles, and first catoptron is positioned at second catoptron and the 3rd catoptron top;
Said nonlinear medium adopts the media sheet of passing through ultraviolet light;
Said light barrier blocks the residue switch light and detection light from the nonlinear medium outgoing, only lets diffracted beam pass through;
Said spectrometer receives diffracted beam, forms the FROG collection of illustrative plates;
The computing machine of the said FROG of being furnished with iterative program carries out iterative computation with the FROG collection of illustrative plates, restores the information such as waveform, pulsewidth, spectrum, bandwidth, phase place of single ultraviolet ultrashort-pulse.
(3) invention effect
In technique scheme, when two beam switch light time and space on nonlinear medium all overlap, just to interfere each other to form the refractive index transient grating, grating line is exactly the interference fringe of two-beam, and their vertical focal lines distribute.This transient grating carries out diffraction along focal line to forward position, center, the edge, back of detecting optical pulses simultaneously; Like this; The single emission that only needs pulse; The time delay information of pulse just is mapped on the spatial beam cross section of diffraction light one by one, thereby has solved the indeterminable single measurement problem of method of quadratic harmonics FROG system.In addition; Since diffracted beam be produced as the transient grating diffraction process, so the wavelength of diffracted beam and pulse consistent wavelength to be measured that is to say; This measuring method and Wavelength-independent; Not only can realize the measurement of ultraviolet band pulse, can also be used for the measurement of its all band pulse, can not be thereby solved method of quadratic harmonics FROG system in the problem of ultraviolet band measurement.Also have,, can slightly reduce so build the cost of device owing to do not use expensive frequency-doubling crystal.
Description of drawings
Fig. 1 is a frequency resolution optical shoulder rotation measurement mechanism schematic diagram.Wherein, 1 is the testing laser pulse; 2 is beam-splitter; K1, k2, k3 are the three-beam that beam-splitter 2 is told; 3 is the post lens; 4-1,4-2,4-3 are respectively first catoptron, second catoptron and the 3rd catoptron; 5 is nonlinear medium; 6 is light barrier; Ks is a diffracted beam; 7 is spectrometer; 8 for having the computing machine of FROG iterative program.
Fig. 2 is the beam-splitter structural representation.
Fig. 3 is the light barrier structural representation.
Fig. 4 is the inner diffraction process stereographic map of nonlinear medium.Wherein: k1, k2, k3 are the three-beams that beam-splitter 2 branches away, and G is the transient gratings that light beam k2 and k3 form in nonlinear medium 5 inside, and light beam k1 is by transient grating G diffraction, and diffracted beam is ks.
Fig. 5 is that the master that present embodiment measures is put the FROG image.
Fig. 6 is that the present embodiment master is put pulse waveform and PHASE DISTRIBUTION thereof.
Fig. 7 is spectrum and the distributed wave thereof that the present embodiment master is put the output pulse.
Embodiment
Below in conjunction with accompanying drawing, technical scheme provided by the present invention is done further to set forth.
Like Fig. 1, Fig. 2 and shown in Figure 3; A kind of single ultraviolet ultrashort-pulse laser frequency resolution optical shoulder rotation measurement mechanism comprises beam-splitter 2, post lens 3, the first catoptron 4-1, the second catoptron 4-2, the 3rd catoptron 4-3, nonlinear medium 5, light barrier 6, spectrometer 7 and computing machine 8.
Beam-splitter 2 is on one flat plate, to dig out three identical rectangular openings, and three rectangular openings are centered close on foursquare three summits, and in the present embodiment, rectangular opening is of a size of 10mm * 2mm, and the hole is in the heart apart from 15mm.The first catoptron 4-1, the second catoptron 4-2, the 3rd catoptron 4-3 are positioned in the middle of post lens and the nonlinear medium, and the second catoptron 4-2 and the 3rd catoptron 4-3 mirror are compact to be placed, and the minute surface normal has 7～8 degree angles, and present embodiment is designed to 7.5 degree angles; First catoptron is positioned at second catoptron and the 3rd catoptron top.Beam-splitter 2 is divided into shape identical three beams directional light k1, k2, k3 with testing laser pulse 1, and the three beams directional light is that 30mm * 30mm, focal length are that post lens 3 line focuss of 500mm are to nonlinear medium 5 by sectional dimension.Wherein light beam k1 and k2 through the first catoptron 4-1 and second catoptron 4-2 reflection after, incide on the nonlinear medium 5, light beam k3 also incides on the nonlinear medium 5 after reflecting with the 3rd catoptron 4-3 through first catoptron 4-1 reflection.
Nonlinear medium 5 thickness are 0.7～0.8mm, and material adopts fused quartz.As shown in Figure 4, in nonlinear medium 5 inside, light beam k2 and light beam k3 cross-coincidence; When the time is synchronous, form refractive index transient grating G, light beam k1 is by transient grating G diffraction; Form diffracted beam ks, from four bundle light k1, k2, k3 and the ks beam cross section of nonlinear medium 5 outgoing, be formed centrally a square, wherein k1, k2, k3 are blocked by light barrier 6; Only let diffracted beam ks pass through, diffracted beam ks is parallel with surface level, is introduced and carries out frequency discrimination in the spectrometer 7; Form the FROG collection of illustrative plates, show and the iteration reduction by computing machine 8 at last.
In the present embodiment, the temporal resolution of measurement mechanism is 37.2fs, and spectral resolution is 0.038nm, and hour range is 8.9ps, and the spectrum range is 9.7nm.Utilizing the wavelength of this measurement device " No. one, the daylight " electron beam pumping KrF PRK main amplifier output is the single ultraviolet ultrashort-pulse laser of 248nm; Obtained the FROG collection of illustrative plates, and restored waveform, spectrum, phase place, pulsewidth and the bandwidth information of single pulse with the computing machine iterative program.The FROG collection of illustrative plates is as shown in Figure 5, and the pulse waveform structure and the time phase that restore are as shown in Figure 6, can have the subpulse structure by read pulse from Fig. 6, and the time overall with is about 4ps, is the parabolic structure that Open Side Down time phase, explains that pulse just has to warble.The pulse spectrum structure and the spectrum phase that restore are as shown in Figure 7, can read spectrum from Fig. 7 and have structure, and the spectrum overall with is about 2.5nm, and spectrum phase is the parabolic structure that opening makes progress, and explain equally that pulse just has to warble.
Obviously those skilled in the art can carry out various modifications and modification and not break away from the spirit and scope of the present invention the present invention.Like this, if of the present invention these revise and modification belongs in the scope of its equivalent technologies of claim of the present invention, then the present invention also is intended to comprise these modifications and modification.
Claims (3)
1. a frequency resolution optical shoulder rotation measurement mechanism comprises beam-splitter (2), post lens (3), first catoptron (4-1), second catoptron (4-2), the 3rd catoptron (4-3), nonlinear medium (5), light barrier (6), spectrometer (7) and computing machine (8);
Said beam-splitter (2) is on one flat plate, to dig out three identical rectangular openings; Three rectangular openings are centered close on foursquare three summits; Beam-splitter (2) is divided into parallel three beams with incident laser, and wherein two bundles are as switch light, a branch of as surveying light;
Said post lens (3) focus on the three-beam of telling, and focal line is on nonlinear medium (5);
Said first catoptron (4-1), second catoptron (4-2), the 3rd catoptron (4-3) are positioned in the middle of post lens (3) and the nonlinear medium (5); The minute surface normal of second catoptron (4-2), the 3rd catoptron (4-3) has 7～8 degree angles, and first catoptron (4-1) is positioned at second catoptron (4-2), the 3rd catoptron (4-3) top;
Said nonlinear medium (5) adopts the media sheet of passing through ultraviolet light;
Said light barrier (6) blocks the residue switch light and detection light from nonlinear medium (5) outgoing, only lets diffracted beam (ks) pass through;
Said spectrometer (7) receives diffracted beam (ks), forms the FROG collection of illustrative plates;
Said computing machine (8) is furnished with the FROG iterative program, and the FROG collection of illustrative plates is carried out iterative computation, restores the information such as waveform, pulsewidth, spectrum, bandwidth, phase place of single ultraviolet ultrashort-pulse.
2. frequency resolution optical shoulder rotation measurement mechanism according to claim 1 is characterized in that: the minute surface normal angle of described second catoptron (4-2), the 3rd catoptron (4-3) is 7.5 degree.
3. frequency resolution optical shoulder rotation measurement mechanism according to claim 1 is characterized in that: the thickness of described nonlinear medium (5) is 0.7～0.8mm, and material is a fused quartz.
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| CN2010106205011A CN102169021B (en) | 2010-12-23 | 2010-12-23 | Frequency resolution optical switch method measuring device |
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| CN106052751B (en) * | 2016-05-13 | 2019-10-25 | 中国科学院物理研究所 | A kind of frequency resolution optical switch laser measuring device based on transient grating |
| CN111221198A (en) * | 2019-11-21 | 2020-06-02 | 中国科学院上海光学精密机械研究所 | Novel all-optical switch device |
| CN112180537B (en) * | 2020-09-28 | 2021-08-10 | 北京大学 | Array mirror frame for measuring ultrafast optical signal |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6008899A (en) * | 1997-06-18 | 1999-12-28 | Sandia Corporation | Apparatus and method for optical pulse measurement |
| CN1693861A (en) * | 2005-06-08 | 2005-11-09 | 中国科学院上海光学精密机械研究所 | Ultrashort pulse frequency resolution optical switching method measuring device |
| CN2921800Y (en) * | 2006-06-09 | 2007-07-11 | 中国科学院上海光学精密机械研究所 | Accurate real-time measuring device of ultrashort pulse |
| CN201043917Y (en) * | 2006-06-30 | 2008-04-02 | 中国科学院上海光学精密机械研究所 | Ultrashort pulse frequency resolution optical switching method measuring device |
| CN101769796A (en) * | 2010-02-05 | 2010-07-07 | 北京航空航天大学 | Frequency-resolved optical gating method based femtosecond laser pulse testing platform |
-
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- 2010-12-23 CN CN2010106205011A patent/CN102169021B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6008899A (en) * | 1997-06-18 | 1999-12-28 | Sandia Corporation | Apparatus and method for optical pulse measurement |
| CN1693861A (en) * | 2005-06-08 | 2005-11-09 | 中国科学院上海光学精密机械研究所 | Ultrashort pulse frequency resolution optical switching method measuring device |
| CN2921800Y (en) * | 2006-06-09 | 2007-07-11 | 中国科学院上海光学精密机械研究所 | Accurate real-time measuring device of ultrashort pulse |
| CN201043917Y (en) * | 2006-06-30 | 2008-04-02 | 中国科学院上海光学精密机械研究所 | Ultrashort pulse frequency resolution optical switching method measuring device |
| CN101769796A (en) * | 2010-02-05 | 2010-07-07 | 北京航空航天大学 | Frequency-resolved optical gating method based femtosecond laser pulse testing platform |
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