CN107436197A - Big bandwidth, the autocorrelation function analyzer of microminiature single-shot automatic measurement femtosecond laser pulsewidth - Google Patents
Big bandwidth, the autocorrelation function analyzer of microminiature single-shot automatic measurement femtosecond laser pulsewidth Download PDFInfo
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- CN107436197A CN107436197A CN201710460445.1A CN201710460445A CN107436197A CN 107436197 A CN107436197 A CN 107436197A CN 201710460445 A CN201710460445 A CN 201710460445A CN 107436197 A CN107436197 A CN 107436197A
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- 238000005259 measurement Methods 0.000 title claims abstract description 16
- 238000005311 autocorrelation function Methods 0.000 title claims abstract description 14
- 239000013078 crystal Substances 0.000 claims abstract description 11
- 239000011159 matrix material Substances 0.000 claims abstract description 7
- 238000012360 testing method Methods 0.000 claims abstract description 4
- 230000001427 coherent effect Effects 0.000 claims abstract 5
- 230000003287 optical effect Effects 0.000 claims description 5
- 238000013519 translation Methods 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims 1
- 230000010287 polarization Effects 0.000 claims 1
- 241001269238 Data Species 0.000 abstract 1
- 238000000034 method Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 102000003729 Neprilysin Human genes 0.000 description 1
- 108090000028 Neprilysin Proteins 0.000 description 1
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- 235000008429 bread Nutrition 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009022 nonlinear effect Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J11/00—Measuring the characteristics of individual optical pulses or of optical pulse trains
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- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
- Lasers (AREA)
Abstract
The invention discloses a kind of big bandwidth, the autocorrelation function analyzer of microminiature single-shot automatic measurement femtosecond laser pulsewidth, including aperture, spectroscope, speculum, frequency-doubling crystal, Matrix C CD, computer, testing laser pulse obtains calibration pulse by aperture, incident laser is divided into two beams by spectroscope again, spatially merge after certain light delay is introduced between two-beam, focus on frequency-doubling crystal and carry out from relevant, detect from coherent pulse by Matrix C CD and the data detected are sent on computer, obtain removing the detailed datas such as pulse intensity distribution curve map and the pulse width of bias light by a series of processing of computer software.Apparatus of the present invention are simple and compact for structure, and measurement accuracy is high, can measure the pulsewidth of single laser pulse, simple to operate.
Description
Technical field
The present invention relates to femtosecond laser technology field, and in particular to a kind of big bandwidth single-shot automatic measurement femtosecond laser pulsewidth
Autocorrelation function analyzer.
Background technology
As femtosecond laser is in scientific research, the extensive use of industrial circle, at present in physics, biology and chemical field
In, produce radiographic source using femto-second laser pulse and observe various dynamic processes and supper-fast phenomenon, it has also become be a kind of fine
New and effective research meanses, it is corresponding, it is necessary to working site it is convenient, it is efficient, accurately measure femtosecond laser pulse width
Measurement be also particularly important.At present through frequently with correlation method, there is compact-sized, regulation simply, high resolution is sensitive
The features such as high is spent, is the instrument that femtosecond laser pulse width measurement generally uses.
The measuring principle of autocorrelation function analyzer is to make two identical pulse generation times poor so that the two pulse lasers are in frequency-doubling crystal
In due to nonlinear effect produce frequency doubled light, then with CCD gather signal, by the time for constantly adjusting two pulse lasers
Difference, the change according to signal with the time difference, measurement obtain the width of pulse.This method needs mechanical original paper to adjust multiple pulses
Time difference, take longer, it is impossible to quickly measure the width of single laser pulse, and in order to produce burst length difference, it is necessary to
Optical element it is more, cause equipment instrument larger, cost is higher.
The content of the invention
It is inexpensive it is an object of the present invention to provide one kind for the disadvantages described above and Improvement requirement of prior art, big bandwidth
Microminiature single-shot automatic measurement femtosecond laser pulsewidth and it is easy to carry, the autocorrelation function analyzer that working stability, measurement accuracy are higher.This
One laser pulse is divided into two by invention by beam splitting, allows two laser pulses to produce frequency doubled light, by measuring frequency multiplication light intensity
The distribution of degree, by the anti-pulsewidth for releasing pulse laser in space, the width of single laser pulse can be measured using this technology, is had
Rapidly and efficiently, the characteristics of precision is high, and component used is less, small volume, is easy to carry, and cost is low.
Big bandwidth, the autocorrelation function analyzer of microminiature single-shot automatic measurement femtosecond laser pulsewidth, including：Aperture, spectroscope, first and second,
3rd, four speculum, frequency-doubling crystal, planoconvex spotlight, Matrix C CD, processor, accurate translation stage；.
The present invention by the optimization design of optical module, improve, make equipment instrument small, it is in light weight, be easy to carry；By optimizing light
Road, eyeglass is saved, has saved substantial amounts of cost；By independent development Survey Software, very simple, the fitting degree of accuracy is operated with
Higher, measurement result is accurate.Nonlinear optical element BBO is using the type II series of ultra-thin low dispersion, measurement angle scope
Extensively, it is more accurate to measure.
Brief description of the drawings：
Fig. 1 is autocorrelation function analyzer structure chart of the present invention；
Fig. 2 is autocorrelation function analyzer local structural graph of the present invention；
Fig. 3 is the experimental result that autocorrelation function analyzer of the present invention is tested；
Embodiment：
In order that the object, technical solution and advantage of autocorrelation function analyzer of the present invention are more clearly understood, below in conjunction with accompanying drawing and example,
The present invention will be described in further detail.
Aperture 1, spectroscope 2, speculum 3-6, frequency-doubling crystal 7, aperture 8, planoconvex spotlight 9, Matrix C CD10, processor 11 and essence
Close translation stage, first testing laser pulse obtain calibration pulse by aperture, then calibration pulse is divided into two beam phases by spectroscope
Reflect straight up with pulse is a branch of, it is a branch of to penetrate；Two pulses pass through 5,6 two articles of light of speculum 3,4 and speculum respectively
Road reflection after converge on the bbo crystals of Type II, after after the vertical axis of the bbo crystals of Type II pass through Matrix C CD detection times
Frequency light pulse, then the spatial-intensity data detected are transmitted to computer, single laser pulse width is calculated by computer.
The aperture 1 in above-mentioned invention, spectroscope 2, speculum 5,6 is in one plane；Reflective mirror 3,4, BBO 7, aperture 8,
Convex lens 9, in approximately the same plane, two levels difference 50mm, described device is each attached on same bread board CCD 10,
The reflected light angle of speculum 4 and 6 is within 20 °.
An instantiation is lifted below：
Measure a Gauss laser pulse, near wavelength 800nm, using grey point CCD, pixel size is 6 microns × 6 microns, use
Labview writes and be issued as can installation procedure.By adjusting displacement platform, two-beam road is set to produce optical path difference, Fig. 3 is test
The experimental result arrived.Using this data of software processing, frequency doubled light spatial distribution is converted into the time width of pulse, measures pulsewidth
For 77 femtoseconds.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not limiting
The present invention, all any modification, equivalent and improvement made within the spirit and principles of the invention etc., it should be included in this
Within the protection domain of invention.
Claims (3)
1. the autocorrelation function analyzer of big bandwidth, microminiature single-shot automatic measurement femtosecond laser pulsewidth, it is characterised in that including：Aperture
（1）, spectroscope（2）, first, second, third and fourth speculum（3、4、5、6）, frequency-doubling crystal（7）, aperture（8）, planoconvex spotlight（9）, square
Battle array CCD（10）, processor（11）, accurate translation stage；
Aperture（1）, for testing laser pulse to be adjusted into calibration pulse；Spectroscope（2）It is placed in aperture（1）Rear, for inciting somebody to action
Calibration pulse is divided into that two beam identical pulses are a branch of to reflect straight up, a branch of to penetrate；First speculum（3）For will be spectroscopical
The light polarization state reflected back changes 90 ° of horizontal reflections in the second speculum（4）On；Second speculum（4）For by first
The light that speculum reflects back is reflexed on the frequency-doubling crystals of Type II 2；Third and fourth speculum（5、6）Form corner cube mirror,
For by spectroscope transmitted through come laser and the second speculum（4）Light be superimposed on two frequency-doubling crystals；Frequency-doubling crystal（7）With
Frequency multiplication is produced in causing two beam identical pulses；Aperture（8）For filtering out, other optical signals in addition to frequency-doubled signal；Convex lens
（9）For amplifying frequency-doubled signal；Matrix C CD（10）For gathering frequency-doubled signal；Processor（11）For according to Matrix C CD（10）
The pulse signal strength of collection calculates pulse width；Accurate translation stage is used to place third and fourth speculum（5,6）, pass through position
Movement is adjusted to first from coherent point and second from coherent point, for correcting.
2. the autocorrelation function analyzer of big bandwidth according to claim 1, microminiature single-shot automatic measurement femtosecond laser pulsewidth, it is special
Sign is, is specially：
Pass through mobile third and fourth mobile speculum of precise mobile platform adjustment（5,6）Position, so as to adjust the time of two pulses
Delay, is adjusted to first from coherent point and second from coherent point, for correcting.
3. the autocorrelation function analyzer of big bandwidth according to claim 1, microminiature single-shot automatic measurement femtosecond laser pulsewidth, it is special
Sign is, is specially：
Convex lens（9）For amplifying frequency-doubled signal, make the spacing wave that measures clear, be easy to be converted into laser pulse width letter
Number.
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| Application Number | Priority Date | Filing Date | Title |
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|---|---|---|---|
| CN201710460445.1A CN107436197A (en) | 2017-06-17 | 2017-06-17 | Big bandwidth, the autocorrelation function analyzer of microminiature single-shot automatic measurement femtosecond laser pulsewidth |
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|---|---|---|---|---|
| JPH07270246A (en) * | 1994-03-31 | 1995-10-20 | Tera Tec:Kk | Indirect measuring device for width of pulse of ultrashort optical pulse |
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| CN2519256Y (en) * | 2002-01-29 | 2002-10-30 | 中国科学院物理研究所 | Bifunction miniature super short laser pulse self correlation measuring apparatus |
| CN201096527Y (en) * | 2007-08-15 | 2008-08-06 | 中国科学院大连化学物理研究所 | Autocorrelation instrument for measuring femtosecond laser pulse wavefront characteristic |
| US7420685B1 (en) * | 2005-04-29 | 2008-09-02 | University Of Rochester | Dispersion-free, automatically phase-matched, and broad spectral-band femtosecond autocorrelation technique |
| CN102353465A (en) * | 2011-09-30 | 2012-02-15 | 湖南大学 | Time pulse width measurement system for ultrashort pulses in different spatial positions and measurement method thereof |
| CN103808417A (en) * | 2014-03-05 | 2014-05-21 | 河南师范大学 | Measurement device for femtosecond laser pulse width |
| CN104483027A (en) * | 2014-12-04 | 2015-04-01 | 华中科技大学 | Automatic laser pulse width measurement autocorrelator and measurement method |
| CN104697647A (en) * | 2015-02-13 | 2015-06-10 | 中国科学院上海光学精密机械研究所 | Ultra-short pulse time waveform and chirp rate measuring device and method |
| CN104880258A (en) * | 2015-06-04 | 2015-09-02 | 中国科学院上海光学精密机械研究所 | Device and method for measuring near-field correlation pulse width of ultrashort optical pulses |
| CN106289545A (en) * | 2016-08-29 | 2017-01-04 | 中国科学院上海光学精密机械研究所 | High-resolution femtosecond laser pulse width measuring instrument |
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2017
- 2017-06-17 CN CN201710460445.1A patent/CN107436197A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07270246A (en) * | 1994-03-31 | 1995-10-20 | Tera Tec:Kk | Indirect measuring device for width of pulse of ultrashort optical pulse |
| CN1358987A (en) * | 2001-11-30 | 2002-07-17 | 中国科学院上海光学精密机械研究所 | Single scaling second-order monoemitting autocorrelation measurer |
| CN2515663Y (en) * | 2001-12-26 | 2002-10-09 | 中国科学院上海光学精密机械研究所 | Optical pulse information measurer capable of measuring and calibrating at same time |
| CN2519256Y (en) * | 2002-01-29 | 2002-10-30 | 中国科学院物理研究所 | Bifunction miniature super short laser pulse self correlation measuring apparatus |
| US7420685B1 (en) * | 2005-04-29 | 2008-09-02 | University Of Rochester | Dispersion-free, automatically phase-matched, and broad spectral-band femtosecond autocorrelation technique |
| CN201096527Y (en) * | 2007-08-15 | 2008-08-06 | 中国科学院大连化学物理研究所 | Autocorrelation instrument for measuring femtosecond laser pulse wavefront characteristic |
| CN102353465A (en) * | 2011-09-30 | 2012-02-15 | 湖南大学 | Time pulse width measurement system for ultrashort pulses in different spatial positions and measurement method thereof |
| CN103808417A (en) * | 2014-03-05 | 2014-05-21 | 河南师范大学 | Measurement device for femtosecond laser pulse width |
| CN104483027A (en) * | 2014-12-04 | 2015-04-01 | 华中科技大学 | Automatic laser pulse width measurement autocorrelator and measurement method |
| CN104697647A (en) * | 2015-02-13 | 2015-06-10 | 中国科学院上海光学精密机械研究所 | Ultra-short pulse time waveform and chirp rate measuring device and method |
| CN104880258A (en) * | 2015-06-04 | 2015-09-02 | 中国科学院上海光学精密机械研究所 | Device and method for measuring near-field correlation pulse width of ultrashort optical pulses |
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