CN106289544A - The pulse measuring method of high-contrast and measurement apparatus - Google Patents
The pulse measuring method of high-contrast and measurement apparatus Download PDFInfo
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- CN106289544A CN106289544A CN201610629555.1A CN201610629555A CN106289544A CN 106289544 A CN106289544 A CN 106289544A CN 201610629555 A CN201610629555 A CN 201610629555A CN 106289544 A CN106289544 A CN 106289544A
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- 238000005259 measurement Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 35
- 230000008859 change Effects 0.000 claims abstract description 5
- 230000007246 mechanism Effects 0.000 claims abstract description 4
- 230000005540 biological transmission Effects 0.000 claims description 11
- 239000000835 fiber Substances 0.000 claims description 10
- 210000001367 artery Anatomy 0.000 claims description 8
- 210000003462 vein Anatomy 0.000 claims description 8
- 238000004080 punching Methods 0.000 claims description 7
- 238000004458 analytical method Methods 0.000 claims description 6
- 238000001228 spectrum Methods 0.000 claims 1
- 230000009022 nonlinear effect Effects 0.000 abstract description 7
- 239000013078 crystal Substances 0.000 abstract description 6
- 239000013307 optical fiber Substances 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 230000010287 polarization Effects 0.000 description 5
- 230000033228 biological regulation Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000005311 autocorrelation function Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000009466 transformation Effects 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
Abstract
The present invention relates to pulse measuring method and the measurement apparatus of a kind of high-contrast, a beam splitting arrangement is passed through in pulse to be measured, is classified as identical two-way, and a road pulse is exported by modulators modulate；Another pulse carries out time delay by time-delay mechanism；Last two-way pulse is followed by audiofrequency spectrometer by beam merging apparatus；Obtain along with the modulated signal from high to low or from low to high of delay length change from audiofrequency spectrometer, this modulated signal is the pulse autocorrelation signal showed with logarithmic form, analyzed and processed by computer, finally give the width of pulse to be measured and the contrast of pulse.Avoid the method that traditional nonlinear effect utilizing frequency-doubling crystal measures autocorrelation signal, decrease the interference of noise signal introduced due to nonlinear effect, and the present invention is possible not only to measure pulse width and can directly tell the contrast of pulse, so measuring more accurate, the margin of error is less.
Description
Technical field
The present invention relates to a kind of laser parameter measurement technology, particularly to pulse measuring method and the survey of a kind of high-contrast
Amount device.
Background technology
Recently as the continuous progress of laser technology, laser pulse constantly develops to the direction of ultra-short pulse laser.
Physics, chemistry and field of biology, utilize femtosecond pulse laser to observe various dynamic processes, various ultrafast phenomenas with
And bio-imaging process has become the important means of research.And pulse width measuring the most accurately can largely affect various sight
The precision surveyed is so the accurate measurement for pulse width is just particularly important.
Based on current technological means, the instrument of current Laser Measurement pulse width is mainly autocorrelation function analyzer, autocorrelation function analyzer
Compact conformation, uses simple, has higher resolution and sensitivity, is the main method measuring ultra-short pulse width.It is surveyed
Amount principle is that pulse is divided into identical two-way, a road there is time delays, and another road does not occur time delay, makes two-way arteries and veins the most again
Punching, by frequency-doubling crystal, utilizes the second order nonlinear effect of frequency-doubling crystal, produces frequency-doubled signal, then with frequency-doubled signal to original
Pulse is scanned, and changes relative time delay equably and can obtain pulse autocorrelation signal from high to low or from low to high, then
This signal is read relevant parameter by oscillograph, thus is gone out the width of ultrashort pulse by auto-correlation formula to calculating.Use
Oscillograph reads parameter, can there is error, takes the method for repetitive measurement can reduce error, but can not show from basic elimination
The measurement error that ripple device is brought.And measuring the main method of contrast ration is to utilize second order nonlinear effect to produce frequency multiplication letter
Number, then fundamental frequency signal is injected in crystal together with frequency-doubled signal, produces and frequency signal, using with frequency signal as detectable signal pair
Measured signal is scanned, and obtains autocorrelation signal from high in the end or from low to high.The right of pulse can be obtained by calculating
Degree of ratio.Owing to detectable signal is the signal extracting from measured signal and being refined, so the details of measured signal just may be used
To be accurately obtained by scanning, the pulse width measured is the most accurate.But the pulse width that the method is measured or pulse
Contrast there is also some shortcomings, when the intensity of measured signal is relatively low, since it is desired that by twice non-linear process, and frequency multiplication
Or and frequently there is certain transformation efficiency, it is possible that frequency multiplication or too low with the signal that frequency obtains can be caused.So may result in
The autocorrelation signal indeterminacy of pulse width or measure less than autocorrelation signal due to the impact of noise signal.
Summary of the invention
The present invention be directed to the problem that measurment of laser pulse width method exists, it is proposed that the pulse of a kind of high-contrast is surveyed
Metering method and measurement apparatus, the present invention avoids utilizing the opto-electronic conversion of the second order nonlinear effect of frequency-doubling crystal and utilizing oscillography
The device process to the reading of relevant parameter, reduces the measurement error that oscillograph brings, and the autocorrelation signal measured is with logarithm
Form show, measuring the pulse width that obtains the most accurate, contrast ration is higher.
The technical scheme is that the pulse measuring method of a kind of high-contrast, pulse to be measured is filled by a beam splitting
Putting, be classified as identical two-way, a road pulse is exported by modulators modulate；Another pulse is prolonged by time-delay mechanism
Time；Last two-way pulse is followed by audiofrequency spectrometer by beam merging apparatus；Obtain from audiofrequency spectrometer along with delay length change by
High to Low or modulated signal from low to high, this modulated signal is the pulse autocorrelation signal showed with logarithmic form, logical
Cross computer analyzing and processing, finally give the width of pulse to be measured and the contrast of pulse.
The measurement apparatus of the pulse measuring method of described high-contrast, pulse to be measured is divided into identical two by beam splitter
Road, leads up to and arrives light combination mirror after adjustable time delay, and manipulator, first by 45 degree lens reflectings, is then passed through in another road,
Rear arrival light combination mirror, light combination mirror two-way pulse is combined into again a branch of after send audiofrequency spectrometer.
The measurement apparatus of the pulse measuring method of described high-contrast, pulse to be measured is divided into two-way after entering beam splitter, and one
Road pulse transmission, is reflected by the reflecting mirror after manipulator and manipulator, more return by manipulator, anti-finally by beam splitter
Inject audiofrequency spectrometer；And after another road pulse is reflected by beam splitter, by another reflecting mirror being contained on the motor moved up and down
After reflection, then be transmitted into audiofrequency spectrometer by beam splitter, beam splitter by by modulation with by the two paths of signals of motor time delay again
With for a branch of entrance audiofrequency spectrometer.
The measurement apparatus of the pulse measuring method of described high-contrast, pulse to be measured is divided into identical two by beam splitter
Bundle, a branch of transmission, the pulse of transmission pass sequentially through a piece of 1/2nd wave plates, the reflection of polarization beam apparatus, a piece of four/
After one wave plate, reflecting mirror return again to by quarter-wave plate after reflecting, then be transmitted to bundling device by polarization beam apparatus；And
Another bundle reflected impulse is by passing through manipulator after 45 degree lens reflectings to bundling device, and last two-way pulse is by bundling device again
It is combined into a road and enters audiofrequency spectrometer.
The measurement apparatus of the pulse measuring method of described high-contrast, pulse to be measured is divided into phase by the bonder of 1:1
With two-way, lead up to and returned it into by the first Faraday rotator after fiber delay time device, and separately lead up to after manipulator
Being returned it into by the second Faraday rotator, two-way returns pulse and is exported audiofrequency spectrometer by the other end of bonder.
The measurement apparatus of the pulse measuring method of described high-contrast, pulse to be measured is divided into identical by the first bonder
Two-way, leads up to fiber delay time device, separately leads up to manipulator, finally by the second bonder, output two-way pulse is combined into one
Road enters audiofrequency spectrometer.
The beneficial effects of the present invention is: the pulse measuring method of high-contrast of the present invention and measurement apparatus, do not utilize
The second order nonlinear effect of crystal, does not the most introduce the noise brought by nonlinear effect, so the signal to noise ratio measured
Higher, and its pulse width and contrast ration can also be measured measured signal is more weak when；The measurement pulse proposed
The method of width both can measure the width of pulse, it is also possible to measures the contrast of pulse；Traditional utilizes frequency multiplication as scanning
The signal gone out of the survey pulse method of signal is the autocorrelation signal under linear coordinate, and the signal that the present invention measures is based on right
The signal of number coordinate, so its precision is higher, the pulse width of measurement is the most accurate.
Accompanying drawing explanation
Fig. 1 is the impulsive measurement apparatus structure block diagram of high-contrast of the present invention；
Fig. 2 is space structure impulsive measurement device embodiment one figure of the present invention；
Fig. 3 is space structure impulsive measurement device embodiment two figure of the present invention；
Fig. 4 is space structure impulsive measurement device embodiment three figure of the present invention；
Fig. 5 is optical fiber structure impulsive measurement device embodiment one figure of the present invention；
Fig. 6 is optical fiber structure impulsive measurement device embodiment two figure of the present invention.
Detailed description of the invention
The pulse measuring method of high-contrast of the present invention makes output pulse pass through a beam splitting arrangement, by it the most exactly
Being divided into identical two-way, manipulator is passed through in a road pulse, and time-delay mechanism is passed through in another pulse；Last two-way light is got one's things ready by conjunction
Postpone and receive on audiofrequency spectrometer；The letter of modulation from high to low or from low to high along with delay length change is obtained from audiofrequency spectrometer
Number, this modulated signal is the pulse autocorrelation signal showed with logarithmic form, is analyzed and processed by computer, finally gives
The width of measured pulse and the contrast of pulse.
The impulsive measurement apparatus structure block diagram of high-contrast as shown in Figure 1, including beam splitter, chronotron, manipulator, closes bundle
Device, audiofrequency spectrometer.Pulse to be measured is divided into identical two-way, a road to be used for adding modulated signal by beam splitter, and a road is used for making pulses generation
Time delay；Chronotron so that it is in a road pulses generation time delay；Manipulator, makes pulse to be measured add modulated signal；Bundling device, by two
Road pulse is combined into a road；Audiofrequency spectrometer for measuring the presence or absence of modulated signal, then by measurement to autocorrelation signal divided by computer
Analyse and be calculated the width of pulse and the contrast of pulse.
With the various embodiments of the survey pulse width of space structure and optical fiber structure, the present invention is made furtherly below
Bright.
Such as Fig. 2 space structure impulsive measurement device embodiment one figure, the present invention is carried 45 degree instead by a beam splitter 1,
Penetrate the chronotron 2 of mirror, a piece of reflecting mirror 4, light combination mirror 5 of 3, manipulator and audiofrequency spectrometer 6 to form.Beam splitter 1 will input
Pulse is divided into identical two-way, and chronotron 2 of leading up to arrives light combination mirror 5 afterwards, and another road is first reflected by 45 degree of eyeglasses 3,
Then by manipulator 4, light combination mirror 5 is finally arrived.Two-way pulse is combined into a branch of by light combination mirror again, audiofrequency spectrometer 6 measure
Be the autocorrelation signal from high to low or from low to high of manipulator.Concrete operations be regulation chronotron 2, then it is observed that
Modulated signal change from high to low or from low to high, then by the analyzing and processing to modulated signal, obtains the width of pulse
And the contrast of pulse.
Space structure impulsive measurement device embodiment two figure as shown in Figure 3, surveys pulse width for space structure of the present invention
Another kind of scheme.By a beam splitter 10, two panels reflecting mirror 11,12, a manipulator 13, a motor 14 and audiofrequency spectrometer 15 groups
Become.Incident pulse is divided into two-way after entering beam splitter 10, a road pulse transmission, then by manipulator 13, then by reflecting mirror 12
Reflection, then by manipulator 13, reflect finally by beam splitter 10；And after another road pulse is reflected by beam splitter 10, by dress
After reflecting mirror 11 reflection on the motor 14 moved up and down, finally by beam splitter 10 transmission.Beam splitter 10 will by modulation with
Again and be a branch of by the two paths of signals of motor time delay, then by audiofrequency spectrometer 15 measure obtain by height on earth or from low to high from
Coherent signal, by analysis and the calculating of computist, draws the width of pulse to be measured and the contrast of pulse.
Such as Fig. 4 space structure impulsive measurement device embodiment three figure, survey the signal of pulse width for space structure of the present invention
Figure.Such as figure, the present invention is by a beam splitter 20, a piece of 1/2nd wave plates, a polarization beam apparatus, a piece of quarter-wave
Sheet, reflecting mirror, a bundling device, a manipulator, spectrogrph forms.Incident pulse is divided into identical two by beam splitter 20
Bundle, a branch of transmission, the pulse of transmission passes sequentially through a piece of 1/2nd wave plates 21, and a polarization beam apparatus 22 reflects, and a piece of four
/ mono-wave plate 23, again by quarter-wave plate 23, the most again polarization beam apparatus 22 transmission after being reflected by reflecting mirror 24；And it is another
A branch of reflected impulse passes through manipulator 26 after being reflected by 45 degree of eyeglasses 25.Last two-way pulse is combined into again by bundling device 27
One tunnel, can be obtained from high to low at audiofrequency spectrometer 28 by the length of regulation time delay or have low to high autocorrelation signal, pass through
Computer, to the analysis of signal and process, can obtain width and the contrast of pulse.
Optical fiber structure impulsive measurement device embodiment one figure as shown in Figure 5, the present invention is the survey pulse width of optical fiber structure
Method.By the bonder of a 1:1, two Faraday rotators, a manipulator, a fiber delay time device and audiofrequency spectrometer group
Become.Pulse the most to be measured is divided into identical two-way by the bonder 30 of 1:1, leads up to after fiber delay time device 31 by farad
Rotator 32 returns it into, and separately leads up to and returned it into by Faraday rotator 34 after manipulator 33, last two-way arteries and veins
Punching is exported on audiofrequency spectrometer 35 by the other end of bonder 30.By regulation fiber delay time device 31, can obtain from high to low or
Autocorrelation signal from low to high, then by computer analysis and process, extrapolates width and the contrast ration of pulse.
Optical fiber structure impulsive measurement device embodiment two figure as shown in Figure 6, measures another of pulse width for optical fiber structure
The scheme of kind, is made up of the bonder of two 1:1, a manipulator, a fiber delay time device and audiofrequency spectrometer.First by input pulse
It is divided into identical two-way by bonder 40, leads up to fiber delay time device 41, separately lead up to manipulator 42, finally by coupling
Two-way pulse is combined into a road and is measured its modulated signal by audiofrequency spectrometer 44 by device 43.By regulation fiber delay time device, can be by frequency
Autocorrelation signal from high to low or from low to high measured by spectrometer, then by computer analysis and process, extrapolates pulse
Width and contrast ration.
Claims (6)
1. the pulse measuring method of a high-contrast a, it is characterised in that beam splitting arrangement is passed through in pulse to be measured, is classified as
Identical two-way, a road pulse is exported by modulators modulate；Another pulse carries out time delay by time-delay mechanism；Last two-way arteries and veins
Punching is followed by audiofrequency spectrometer by beam merging apparatus；Obtain from audiofrequency spectrometer along with delay length change from high to low or by low to
High modulated signal, this modulated signal is the pulse autocorrelation signal showed with logarithmic form, at computer analysis
Reason, finally gives the width of pulse to be measured and the contrast of pulse.
The measurement apparatus of the pulse measuring method of high-contrast the most according to claim 1, it is characterised in that described arteries and veins to be measured
Punching is divided into identical two-way by beam splitter, leads up to and arrives light combination mirror after adjustable time delay, and another road is first by 45 degree of mirrors
Sheet reflects, and then by manipulator, finally arrives light combination mirror, light combination mirror two-way pulse is combined into again a branch of after send frequency spectrum
Instrument.
The measurement apparatus of the pulse measuring method of high-contrast the most according to claim 1, it is characterised in that described arteries and veins to be measured
It is divided into two-way after rushing in beam splitter, a road pulse transmission, reflected by the reflecting mirror after manipulator and manipulator, more return logical
Ovennodulation device, is reflected into audiofrequency spectrometer finally by beam splitter；And after another road pulse is reflected by beam splitter, by being contained in up and down
After another reflecting mirror reflection on the motor of movement, then being transmitted into audiofrequency spectrometer by beam splitter, beam splitter will be by modulation with logical
The two paths of signals crossing motor time delay again and is a branch of entrance audiofrequency spectrometer.
The measurement apparatus of the pulse measuring method of high-contrast the most according to claim 1, it is characterised in that described arteries and veins to be measured
Punching is divided into two identical bundles, a branch of transmission by beam splitter, the pulse of transmission pass sequentially through a piece of 1/2nd wave plates, one partially
Shake after beam splitter reflection, a piece of quarter-wave plate, reflecting mirror return again to by quarter-wave plate after reflecting, then by partially
The beam splitter that shakes is transmitted to bundling device；And another bundle reflected impulse is by passing through manipulator after 45 degree lens reflectings to bundling device,
Last two-way pulse is again combined into a road and enters audiofrequency spectrometer by bundling device.
The measurement apparatus of the pulse measuring method of high-contrast the most according to claim 1, it is characterised in that described arteries and veins to be measured
Punching is divided into identical two-way by the bonder of 1:1, leads up to it after fiber delay time device by the first Faraday rotator
Returning, and separately lead up to and returned it into by the second Faraday rotator after manipulator, two-way returns another by bonder of pulse
One end exports audiofrequency spectrometer.
The measurement apparatus of the pulse measuring method of high-contrast the most according to claim 1, it is characterised in that described arteries and veins to be measured
Punching is divided into identical two-way by the first bonder, leads up to fiber delay time device, separately leads up to manipulator, finally by second
Output two-way pulse is combined into a road and enters audiofrequency spectrometer by bonder.
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Cited By (9)
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| CN108072878A (en) * | 2017-11-22 | 2018-05-25 | 北京理工大学 | A kind of time domain super-resolution compressed sensing Full wave shape laser radar range method and device |
| CN108519567A (en) * | 2018-04-23 | 2018-09-11 | 中国科学院物理研究所 | Pulse magnetic field measurement method and corresponding device |
| CN108760058A (en) * | 2018-04-17 | 2018-11-06 | 厦门大学 | A kind of measurement method and device of ultra-short laser impulse width |
| CN109883557A (en) * | 2019-02-28 | 2019-06-14 | 上海交通大学 | Integrated optics autocorrelation function analyzer and measurement method based on selenizing molybdenum two-photon absorption |
| CN110031229A (en) * | 2018-12-30 | 2019-07-19 | 瑞声科技(新加坡)有限公司 | A kind of measurement method and device of motor bandwidth |
| CN111637980A (en) * | 2020-06-06 | 2020-09-08 | 浙江大学 | Integrated optical autocorrelator based on two-dimensional material transverse double frequency effect |
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| CN116067630A (en) * | 2023-03-22 | 2023-05-05 | 武汉中科锐择光电科技有限公司 | Device, system and method for evaluating spontaneous emission duty ratio with low repetition frequency |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108072878A (en) * | 2017-11-22 | 2018-05-25 | 北京理工大学 | A kind of time domain super-resolution compressed sensing Full wave shape laser radar range method and device |
| CN108760058A (en) * | 2018-04-17 | 2018-11-06 | 厦门大学 | A kind of measurement method and device of ultra-short laser impulse width |
| CN108760058B (en) * | 2018-04-17 | 2020-01-17 | 厦门大学 | Method and device for measuring ultra-short laser pulse width |
| CN108519567A (en) * | 2018-04-23 | 2018-09-11 | 中国科学院物理研究所 | Pulse magnetic field measurement method and corresponding device |
| US11169031B2 (en) | 2018-05-25 | 2021-11-09 | National Chiao Tung University | Measuring device and measuring method |
| US11733103B2 (en) | 2018-05-25 | 2023-08-22 | National Yang Ming Chiao Tung University | Measuring device and measuring method |
| CN110031229A (en) * | 2018-12-30 | 2019-07-19 | 瑞声科技(新加坡)有限公司 | A kind of measurement method and device of motor bandwidth |
| CN110031229B (en) * | 2018-12-30 | 2021-03-26 | 瑞声科技(新加坡)有限公司 | Motor bandwidth measuring method and device |
| CN109883557A (en) * | 2019-02-28 | 2019-06-14 | 上海交通大学 | Integrated optics autocorrelation function analyzer and measurement method based on selenizing molybdenum two-photon absorption |
| CN109883557B (en) * | 2019-02-28 | 2020-10-16 | 上海交通大学 | Integrated optical autocorrelator based on molybdenum selenide two-photon absorption and measuring method |
| CN111637980A (en) * | 2020-06-06 | 2020-09-08 | 浙江大学 | Integrated optical autocorrelator based on two-dimensional material transverse double frequency effect |
| CN112834057B (en) * | 2020-12-30 | 2022-05-20 | 中国科学院西安光学精密机械研究所 | Multi-window pulse measuring device and method |
| CN112834057A (en) * | 2020-12-30 | 2021-05-25 | 中国科学院西安光学精密机械研究所 | Multi-window pulse measuring device and method |
| CN116067630A (en) * | 2023-03-22 | 2023-05-05 | 武汉中科锐择光电科技有限公司 | Device, system and method for evaluating spontaneous emission duty ratio with low repetition frequency |
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