CN101520955A - Method for accurately measuring and controlling time delay of two beams of ultrashort pulse laser - Google Patents
Method for accurately measuring and controlling time delay of two beams of ultrashort pulse laser Download PDFInfo
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Abstract
The invention relates to a method for accurately measuring and controlling time delay of two beams of ultrashort pulse laser. The method of the invention comprises the following steps: a. cross-correlation parallel light path arrangement; b. determining zero synchronization reference time; c. and the space movement of the peak position of the cross-correlation signal is utilized to accurately measure and control the time delay of the two-pulse laser. The invention can accurately measure and control the time delay between two beams of femtosecond-magnitude ultrashort pulse laser, acquire the evolution rule of the plasma during plasma detection, control the focusing power density of the laser beams during multi-beam combination, and overcome the influence of factors such as mechanical return difference, step drop and the like when a stepping motor drives a time delay light path.
Description
Technical field
The invention belongs to the field of measuring technique of ultra-short pulse laser, be specifically related to the method for a kind of accurate measurement and the time-delay of control two ultra-short pulse lasers.
Background technology
In the high field Physical Experiment, light laser and target matter interaction produce plasma, carry out the accurate diagnosis of plasma parameter, need probe light a branch of and the main laser precise synchronization toward contact, by changing the time-delay between main laser and the probe light, know the evolution rule of plasma, therefore, need the synchronized relation between accurately measurement and control main laser and the probe light, to obtain physical data and rule accurately.In addition, carry out multiple beam in the light laser field and close in bundle and the research field at some other ultrafast process, the synchronous requirement between restrainting and restrainting is also very strict, need accurately measure and control the time-delay between restrainting and restrainting.The method of delaying time between the measurement two bundle laser pulses commonly used at present is that photoelectric tube adds oscillograph, and its precision generally can only reach nanosecond to hundreds of picosecond magnitudes; Measure with the streak camera that precision is higher, its precision also can only reach picosecond magnitude, and apparatus expensive, adjusts inconvenience.The synchro measure of femtosecond magnitude and control technology still can't realize with conventional method.
Summary of the invention
The method that the purpose of this invention is to provide a kind of accurate measurement and the time-delay of control two ultra-short pulse lasers.
The method of accurate measurement of the present invention and the time-delay of control two ultra-short pulse lasers may further comprise the steps:
A. cross-correlation parallel optical path arrangement;
Laser pulse forms two bundle laser after beam split, be designated light beam 1 and light beam 2, and then tell fraction laser be designated light beam 3 and light beam 4 respectively from light beam 1 and light beam 2; Light beam 1 and light beam 2 focus on the back and beat on same target spot, place first frequency-doubling crystal at the target spot place, light beam 1 and light beam 2 are interacted in first frequency-doubling crystal obtain and the frequency signal; Light beam 3 and light beam 4 are beaten on second frequency-doubling crystal with certain angle, overlap to carry out producing the single cross-correlated signal with frequency in second frequency-doubling crystal; Be placed with two right angle reflective time-delay light path A and time-delay light path B in the light path, in order to change the time-delay between light beam 1 and light beam 2 and light beam 3 and the light beam 4;
Determining of b, zero synchronous base time;
Adjustment time-delay light path A and time-delay light path B all have second frequency-doubling crystal and the first frequency-doubling crystal place and light generation frequently, receiving with the CCD camera with frequency light of the second frequency-doubling crystal place can obtain and the spatial light intensity distribution of light frequently, obtain the cross-correlated signal of two pulses thus, continuously change the time-delay of time-delay light path B, the first frequency-doubling crystal place be two pulses when maximum with the frequency light intensity synchronous fully, the peak of coherent signal was defined as for zero synchronous base time on this moment CCD camera;
C, utilize the spatial movement of cross-correlated signal peak position to carry out the accurate measurement and the control of the time-delay of two pulse lasers;
Adjust time-delay light path A, between light beam 1 and the light beam 2 and the time-delay between light beam 3 and the light beam 4 will change simultaneously, cross-correlated signal peak position on the CCD camera can be moved, the time-delay of the amount of movement of peak position and two pulses changes linear, the accurate delay of mobile control two pulses by peak position.
The angle of described light beam 3 and 4 dozens of certain angles on second frequency-doubling crystal of light beam is that 3 degree are to 90 degree.
Adopt the present invention can accurately measure and control two time-delays of restrainting between the femtosecond magnitude ultra-short pulse lasers, in the evolution rule of carrying out knowing when plasma is surveyed plasma, in the focusing power density that multiple beam closes bundle time control controlling laser beam, machinery backhaul difference and fall the influence of factors such as step when overcoming step motor drive time-delay light path.
The invention will be further described below in conjunction with accompanying drawing.
Description of drawings
Fig. 1 is the optical path arrangement synoptic diagram of the accurate measurement and the time-delay of control two ultra-short pulse lasers of the embodiment of the invention
Fig. 2 (a) is the cross-correlated signal peak shift cardon of the embodiment of the invention
Fig. 2 (b) is the cross-correlated signal peak shift cardon of the embodiment of the invention
Fig. 2 (c) is the scanning cross-correlated signal figure of the embodiment of the invention
Embodiment
As can be seen from Figure 1, the high-acruracy survey and the control of delaying time between the light path realization two ultra-short pulse lasers of the present invention by accurate measurement and the time-delay of control two ultra-short pulse lasers.Among the figure, the laser pulse of 800nm is divided into two bundles behind spectroscope 1: light beam 1 and light beam 2.Light beam 1 reflects through catoptron (3,4) after spectroscope 2 reflections again, after lens 19 focus on target spot 22; Light beam 2 reflects through catoptron (9,10,11,12,13,14) after catoptron (5,6,7) and spectroscope 8 reflections again, after lens 20 focus on target spot 22.Light beam 1 forms light beam 3 in spectroscope 2 top transmissions, and light beam 3 is injected crystal 21 behind catoptron (15,16,17); Light beam 2 forms light beam 4 in spectroscope 8 top transmissions, and light beam 4 is injected crystal 21 behind catoptron 18; Light beam 3 and light beam 4 overlap in crystal 21 and produce and the frequency signal, by the cross-correlated signal that CCD camera 23 is gathered and the spatial light intensity distribution of signal directions X can obtain two-beam frequently.
Catoptron 6 and catoptron 7 vertical placements, catoptron 10 and catoptron 11 vertical placements are formed time-delay light path A and time-delay light path B respectively.Time-delay light path step motor drive, catoptron 6 and catoptron 7 move simultaneously, and catoptron 10 and catoptron 11 move simultaneously.Adjust time-delay light path B and can change the time-delay of light beam 1 and light beam 2, adjust time-delay light path A and then can change time-delay between light beam 1 and light beam 2 and light beam 3 and the light beam 4 simultaneously at target spot 22 places.
Place one and frequency crystal at the target spot place, at first adjustment time-delay light path A and time-delay light path B all have crystal 21 and target spot 22 places and light generation frequently, crystal 21 place receives the spatial light intensity distribution that can obtain along directions X, the i.e. cross-correlated signal of two pulses with frequency light with CCD camera 23; What target spot 22 places obtained surveys with photomultiplier with frequency light, adjust the time-delay of time-delay light path B continuously, can obtain scanning cross-correlated signal, target spot 22 places be two pulses when maximum with the frequency light intensity synchronous fully, the peak on this moment CCD camera 23 was defined as for zero synchronous base time; Constant time lag light path B, adjust time-delay light path A, between light beam 1 and the light beam 2 and the time-delay meeting between light beam 3 and the light beam 4 change simultaneously, the peak shift momentum of cross-correlated signal changes linear with time-delay on the CCD camera 23, the time-delay that can obtain between light beam 3 and light beam 4 and light beam 1 and the light beam 2 from the amount of movement of peak position changes, and can accurately control the time-delay of two pulses by the spatial movement of control cross-correlated signal peak position.
Light beam 3 and light beam 4 are 4.91 degree in incident crystal 21 leading angle in the present embodiment, and crystalline material is KDP.Target spot is disposed bbo crystal, and in order to produce and the frequency signal, the CCD camera adopts line array CCD, and the pixel directions X is of a size of 7 microns.
Fig. 2 (a) is the cross-correlated signal peak shift cardon that embodiment obtains, two-beam is with the angle incident of 4.91 degree, in a light path, make the optical path difference of light beam 3 and light beam 4 change 54um after accessing cross-correlated signal with standard film, peak position has moved 90 picture numbers, can obtain the Time delay measurement coefficient and be: 2fs/pix.
Situation when Fig. 2 (b) is a two-beam with 76.84 degree angle incidents, light path inserts after three quartzy standard films (3 * 447um), the peak position of coherent signal has moved 83 picture numbers, and quartzy refractive index is 1.54, can obtain the Time delay measurement coefficient and be: 29fs/pix.The angle that changes two-beam can be adjusted the precision and the measurement range of Time delay measurement, can select suitable beam angle and crystal parameter according to concrete measurement requirement in the reality.
Fig. 2 (c) is the scanning simple crosscorrelation curve that the light of 800nm and 400nm focuses on and the frequency back obtains by the adjusting time-delay.Can determine reference time by peak.
Be the Time delay measurement and the control of two bundle laser pulses in the foregoing description, method of the present invention also can be used for the measurement and the control of delaying time between the multiple laser pulse.Method of the present invention both had been applicable to that the laser pulse of identical wavelength also was applicable to the different wavelength of laser pulse, for example can be with light beam 2 frequencys multiplication, light beam 2 after the desire control frequency multiplication and the time-delay of light beam 1 at target spot 22 places, select suitable crystal parameter can make frequency doubled light light beam 4 and fundamental frequency light light beam 3 produce cross-correlated signal at crystal 21 place, by the time-delay of peak position traverse measurement and control bundle 1 and light beam 2.In addition, method of the present invention both had been applicable to that femto-second laser pulse also was applicable to the laser pulse of subpicosecond and picosecond magnitude.
What produce the cross-correlated signal use in the foregoing description is frequency-doubling crystal, in fact also can utilize the device of two-photon absorption effect to produce cross-correlated signal.
In sum, method of the present invention is a kind of convenient enforcement, simple and effective Time delay measurement and control method, can accurately measure and control the time-delays between the two bundle femtosecond magnitude ultra-short pulse lasers, machinery backhaul difference and fall the influence of factors such as step when overcoming step motor drive time-delay light path.
Claims (2)
1. accurately measure and the method for control two ultra-short pulse lasers time-delay for one kind, may further comprise the steps:
A. cross-correlation parallel optical path arrangement;
Laser pulse forms two bundle laser after beam split, be designated light beam 1 and light beam 2, and then tell fraction laser be designated light beam 3 and light beam 4 respectively from light beam 1 and light beam 2; Light beam 1 and light beam 2 focus on the back and beat on same target spot, place first frequency-doubling crystal at the target spot place, light beam 1 and light beam 2 are interacted in first frequency-doubling crystal obtain and the frequency signal; Light beam 3 and light beam 4 are beaten on second frequency-doubling crystal with certain angle, overlap to carry out producing the single cross-correlated signal with frequency in second frequency-doubling crystal; Be placed with two right angle reflective time-delay light path A and time-delay light path B in the light path, in order to change the time-delay between light beam 1 and light beam 2 and light beam 3 and the light beam 4;
B. zero synchronous base time determines;
Adjustment time-delay light path A and time-delay light path B all have second frequency-doubling crystal and the first frequency-doubling crystal place and light generation frequently, receiving with the CCD camera with frequency light of the second frequency-doubling crystal place can obtain and the spatial light intensity distribution of light frequently, obtain the cross-correlated signal of two pulses thus, continuously change the time-delay of time-delay light path B, the first frequency-doubling crystal place be two pulses when maximum with the frequency light intensity synchronous fully, the peak of coherent signal was defined as for zero synchronous base time on this moment CCD camera;
C. utilize the spatial movement of cross-correlated signal peak position to carry out accurate measurement and the control that two pulse lasers are delayed time;
Adjust time-delay light path A, between light beam 1 and the light beam 2 and the time-delay between light beam 3 and the light beam 4 will change simultaneously, cross-correlated signal peak position on the CCD camera can be moved, the time-delay of the amount of movement of peak position and two pulses changes linear, the accurate delay of mobile control two pulses by peak position.
2. the method for accurate measurement according to claim 1 and the time-delay of control two ultra-short pulse lasers is characterized in that: the angle of described light beam 3 and 4 dozens of certain angles on second frequency-doubling crystal of light beam is that 3 degree are to 90 degree.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101799332A (en) * | 2010-02-12 | 2010-08-11 | 华东师范大学 | Ultra-short pulse diagnostic method based on molecular arrangement and orientation |
| CN103776550A (en) * | 2014-01-07 | 2014-05-07 | 浙江大学 | Supercontinuum pulse laser measurement device based on nonlinear nano material and method |
| CN104121995A (en) * | 2014-07-01 | 2014-10-29 | 华南师范大学 | Device and method for measuring time-domain width of femtosecond pulse |
| CN105024270A (en) * | 2015-07-16 | 2015-11-04 | 中国工程物理研究院激光聚变研究中心 | Synchronization precise control method of ultra-short pulses in different angles at target point |
| CN105071209A (en) * | 2015-07-21 | 2015-11-18 | 中国工程物理研究院激光聚变研究中心 | Method for debugging compressor of ultra-short pulse laser system |
| CN110174664A (en) * | 2019-05-31 | 2019-08-27 | 深圳市速腾聚创科技有限公司 | The determination method of laser radar system and laser radar echo signal |
| CN113393947A (en) * | 2021-06-07 | 2021-09-14 | 核工业西南物理研究院 | Laser blowing system with strong field side injection |
| CN113686312A (en) * | 2021-08-27 | 2021-11-23 | 中国科学院西安光学精密机械研究所 | Ultra-high-speed continuous sampling stripe camera imaging method and system |
| CN114061457A (en) * | 2021-11-18 | 2022-02-18 | 中国工程物理研究院激光聚变研究中心 | Two-photon fluorescence effect based target positioning system and method of tightly-focused laser device |
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2008
- 2008-12-05 CN CN 200810147783 patent/CN101520955B/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101799332A (en) * | 2010-02-12 | 2010-08-11 | 华东师范大学 | Ultra-short pulse diagnostic method based on molecular arrangement and orientation |
| CN103776550A (en) * | 2014-01-07 | 2014-05-07 | 浙江大学 | Supercontinuum pulse laser measurement device based on nonlinear nano material and method |
| CN104121995A (en) * | 2014-07-01 | 2014-10-29 | 华南师范大学 | Device and method for measuring time-domain width of femtosecond pulse |
| CN105024270A (en) * | 2015-07-16 | 2015-11-04 | 中国工程物理研究院激光聚变研究中心 | Synchronization precise control method of ultra-short pulses in different angles at target point |
| CN105071209A (en) * | 2015-07-21 | 2015-11-18 | 中国工程物理研究院激光聚变研究中心 | Method for debugging compressor of ultra-short pulse laser system |
| CN110174664A (en) * | 2019-05-31 | 2019-08-27 | 深圳市速腾聚创科技有限公司 | The determination method of laser radar system and laser radar echo signal |
| CN113393947A (en) * | 2021-06-07 | 2021-09-14 | 核工业西南物理研究院 | Laser blowing system with strong field side injection |
| CN113686312A (en) * | 2021-08-27 | 2021-11-23 | 中国科学院西安光学精密机械研究所 | Ultra-high-speed continuous sampling stripe camera imaging method and system |
| CN113686312B (en) * | 2021-08-27 | 2022-10-04 | 中国科学院西安光学精密机械研究所 | Ultra-high-speed continuous sampling stripe camera imaging method |
| CN114061457A (en) * | 2021-11-18 | 2022-02-18 | 中国工程物理研究院激光聚变研究中心 | Two-photon fluorescence effect based target positioning system and method of tightly-focused laser device |
| CN114061457B (en) * | 2021-11-18 | 2023-12-05 | 中国工程物理研究院激光聚变研究中心 | Target positioning system and method for tightly focused laser device based on two-photon fluorescence effect |
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