CN105024270A - Synchronization precise control method of ultra-short pulses in different angles at target point - Google Patents
Synchronization precise control method of ultra-short pulses in different angles at target point Download PDFInfo
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- CN105024270A CN105024270A CN201510416830.7A CN201510416830A CN105024270A CN 105024270 A CN105024270 A CN 105024270A CN 201510416830 A CN201510416830 A CN 201510416830A CN 105024270 A CN105024270 A CN 105024270A
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- plasma
- diagnostic light
- main laser
- pulse
- femtosecond
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Abstract
The invention discloses a synchronization precise control method of ultra-short pulses in different angles at a target point. According to the method, femtosecond main laser and other main laser are utilized to generate plasmas; the plasmas are imaged through diagnosis light, so that the synchronization of the pulses can be measured. With the method of the invention adopted, the time delay of pulses in different angles can be controlled. The synchronization precise control method has the advantages of high accuracy, simple operation and the like, and can control the synchronization error of the pulses at a magnitude order of hundreds of femtoseconds.
Description
Technical field
The present invention relates to ultrashort pulse synchronisation control means field, specifically a kind of different angles ultrashort pulse is at the synchronous accuracy control method of target spot.
Background technology
Along with the development of ultra high power Ultrashort pulse technology, femtosecond (10 can be produced at present
-15s), watts (10 are clapped
15w) ultrashort pulse.Ultrashort pulse technology is in Physical Experiment, and as laser fast ignition, optically erasing and plasma are obtained in Raman amplifiction dorsad and apply widely.In Physical Experiment, often require that the short pulse of multi beam different directions is practiced shooting simultaneously, paired pulses synchronously it is also proposed very high requirement, between pulse, delay requirement is in 1 psec (10
-12s) below.
When the synchronous main fast photodiode of pre-test short pulse, its response time is picosecond magnitude.Adopt fast photodiode and the high-speed oscilloscope certainty of measurement limit to be 10 picoseconds, cannot meet the requirement that current high-energy physics experiment paired pulses is synchronous.Short pulse method for synchronously measuring relatively more conventional in another is the spectrum coherent measurement method of pulse, and its cardinal principle is the delayed data being obtained pulse by the spectrum coherent image of delay pulse.Impulsive synchronization control errors can be made by this method at 1 below ps.But this method is mainly used in the measurement of pulse delay in the same way, for reverse or angled laser pulse, be very difficult to the spectrum realized between pulse and be concerned with.In addition, in physics Targeting, need laser pulse to focus on, spectrum coherent method also cannot ranging pulse in the time delay of target spot.
So current sync control technology is difficult to realize synchronous at focus place of different angles short pulse.
summary of the inventionthe object of this invention is to provide the synchronous accuracy control method of a kind of different angles ultrashort pulse at target spot, to solve prior art Problems existing.
In order to achieve the above object, the technical solution adopted in the present invention is:
Different angles ultrashort pulse, at the synchronous accuracy control method of target spot, is characterized in that:
First femtosecond main laser is carried out beam splitting by spectroscope, the light of 90% focuses on target spot by spectroscope and punctures air generation plasma formation heating region, the femtosecond short pulse of 10% is as diagnostic light, subsequently, diagnostic light carries out imaging by heating region plasma after a delay line, utilize imaging len, CCD to gather image, according to the presence or absence of plasma picture judge diagnostic light and main laser in advance or backwardness;
Then the time delay of diagnostic light is regulated, obtain with or without two contrary width images of the state of plasma formation, then the delay adjustment of diagnostic light to time delay middle corresponding to two width images, collect a sub-picture, the presence or absence plasma two width image that the image construction that its state of this image and previous step is contrary is new, because the delay inequality of pulse is always in or without between delay inequality corresponding to Plasma picture, repetition said process progressively can reduce the delay inequality between pulse, finally can the synchronization discrepancy of diagnostic light and main laser be controlled in hundred femtosecond magnitudes, adopting uses the same method can control the synchronization discrepancy of diagnostic light and other main laser.
The principle of the invention is: when Focal intensity reaches certain degree time, and laser can produce plasma by ionized air.Initial ionization mode is multiphoton ionization, and ionization power density is about 10
13w/cm
2, the multiphoton ionization time is about psec to nanosecond (10
-9s) between.Further raising laser power density, air can be made to produce tunnelling ionization, and ionization power density is higher than 10
15w/cm
2, ionization time is several laser cycle (about 10 fs), now, can think at the moment generation plasma that pulse is passed through, just can realize the synchronous accurate control of paired pulses by the state of monitoring of plasma.When diagnostic light is by heating region, because the refractive index of plasma and air refraction have certain difference, CCD can collect the picture of plasma.Can by CCD judges the time delay between diagnostic light and laser focusing with or without plasma.
The present invention can control the time delay of different angles pulse, and it is high to have accuracy, simple operation and other advantages, the synchronous error of pulse can be controlled in hundred femtosecond magnitudes.
The present invention has the following advantages:
1, can realize the synchronous of different angles multi beam ultrashort pulse accurately to control, synchronization accuracy can control within the scope of femtosecond.
The presence or absence of 2, adopting plasma channel by CCD judges the time delay between regulating impulse, and without the need to other data handling procedure, operation is practical simple.
As long as diagnostic light is by heating region in 3, measuring, the On-line Control of impulsive synchronization in Physical Experiment can be realized.
Accompanying drawing explanation
Fig. 1 is principle of the invention schematic diagram.
Fig. 2 is the Plasma picture that between the diagnostic light of the inventive method acquisition and femtosecond main laser 1 and 7, time delay is corresponding.
Embodiment
As shown in Figure 1, the present invention includes three parts: a part is by femtosecond main laser 1,45 ° of total reflective mirror 3.1-3.3, condenser lens, 4, condenser lens 6, main laser 7(pulsewidth is femtosecond or picosecond magnitude) composition, Main Function be scioptics short pulse 1,7 focus on target spot punctures air produce plasma; Part II is by spectroscope 2, and delay line 5,45 ° of total reflective mirrors 3.4 form.Wherein spectroscope 2 act as and separates sub-fraction light as diagnostic light from femtosecond main laser 1, and 5, delay line produces an adjustable time delay to diagnostic light; Part III is made up of imaging len 8 and CCD 9, is the imaging system of plasma.
Implementation process is as follows: first, blocks main laser 7 with diaphragm.Adjust short pulse Isosorbide-5-Nitrae 5 ° of total reflective mirror 3.1-3.3 and lens 4, make femtosecond main laser 1 puncture air at target spot and produce plasma.Adjust spectroscope 2 subsequently, allow femtosecond main laser 1 separate a part of light as diagnostic light, adjust 45 ° of total reflective mirrors 3.4 and make diagnostic light by target spot, then adjust lens 8 and CCD 9, CCD 9 collects the picture of target spot.If CCD 9 can collect Plasma picture, illustrate that diagnostic light is later than femtosecond main laser 1 and arrives target spot, otherwise illustrate that diagnostic light arrives target spot early than femtosecond main laser 1.Control lag line 5 obtains with or without plasma two width image, then femtosecond main laser 1 and diagnostic light time delay are between time delay corresponding to two width images.Continue the delay line 5 regulating diagnostic light, to the time delay middle that two width images are corresponding, observe the image that now CCD collects.If there is plasma, then it and previous step do not have the image of plasma form two new width with or without Plasma picture (otherwise, if there is no plasma, then there is the image sets that the image construction of plasma is new with previous step), at this moment, diagnostic light should be between time delay corresponding to new images group with the time delay of femtosecond main laser 1.Repeat above-mentioned steps, the delay inequality between two width images is to the last enough little and meet the requirement of synchronization accuracy.Next synchronous for what regulate between diagnostic light and main laser 7, method, with consistent, unlike being at this moment benchmark with diagnostic light, regulates the time delay of main laser 7 above.At this time need to block femtosecond main laser 1, and allow main laser 7 produce plasma at target spot, equally by obtaining the time delay determining between diagnostic light and main laser with or without the corresponding time delay of plasma two width image.Require it is namely reach target when the delay inequality of image is little to meeting synchronization accuracy.Like this, take diagnostic light as standard, the accurate control that multi beam different angles main laser is synchronous can be realized.
Fig. 2 gives the Plasma picture that between diagnostic light and femtosecond main laser 1, time delay is corresponding obtained by the inventive method, and the delay inequality of their correspondences is 0.7 ps(a, b), illustrates that the delay inequality between diagnostic light and femtosecond main laser is less than 0.7 ps.Meanwhile, obtain two width Plasma picture of diagnostic light and main laser 7 correspondence, the delay inequality of their correspondences is 0.5 ps(c, d), illustrates that the delay inequality between diagnostic light and femtosecond short pulse is less than 0.5 ps.
Here is the design parameter of the embodiment of the present invention:
1, femtosecond main laser 1 wavelength is 800 nm, and pulsewidth is 30 fs, and energy is 5-10 mJ, and before focusing, beam diameter is about 10 mm.
2, the light splitting ratio of spectroscope 2 is about 9:1, the light of 90% by spectroscope as the main laser producing plasma, the light of 10% by dichroic mirror as diagnostic light.
3,45 ° of speculums are all-trans to 800 nm laser to 3.1-3.4.Delay line 5 comprises a moving guide rail and two 45 ° of total reflective mirrors, and the range of guide rail is 10 mm, and degree of regulation is 0.02 mm, and corresponding time delay is about 70 fs.
4, condenser lens 4,6 focal length is about 50-200 mm, and lens 8 focal length is not limit.
5, main laser 7 wavelength is not limit, and the direction of propagation is not limit, and between pulsewidth 30 fs to 100 ps, energy 10 mJ is to 40 J.
6, CCD 9 can be laser induced to 800 nm.
Claims (1)
1. different angles ultrashort pulse is at the synchronous accuracy control method of target spot, it is characterized in that:
First femtosecond main laser is carried out beam splitting by spectroscope, the light of 90% focuses on target spot by spectroscope and punctures air generation plasma formation heating region, the femtosecond short pulse of 10% is as diagnostic light, subsequently, diagnostic light carries out imaging by heating region plasma after one postpones, utilize imaging len, CCD to gather image, according to the presence or absence of plasma picture judge diagnostic light and main laser in advance or backwardness;
Then the time delay of diagnostic light is regulated, obtain with or without two contrary width images of the state of plasma formation, then the delay adjustment of diagnostic light to time delay middle corresponding to two width images, collect a sub-picture, the presence or absence plasma two width new images that the image construction that this image is contrary with its state with previous step is new, because the delay inequality of pulse is always in or without between delay inequality corresponding to Plasma picture, repetition said process progressively can reduce the delay inequality between pulse, finally can the synchronization discrepancy of diagnostic light and main laser be controlled in hundred femtosecond magnitudes, adopting uses the same method can control the synchronization discrepancy of diagnostic light and other main laser.
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| CN101520955A (en) * | 2008-12-05 | 2009-09-02 | 中国工程物理研究院激光聚变研究中心 | Accurate delay measuring and controlling method of two ultra-short pulse lasers |
| 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 |
| CN102545011A (en) * | 2012-02-22 | 2012-07-04 | 中国科学院上海光学精密机械研究所 | Adjustment and control device and method for ultra intense and ultra short laser pulse super-continuum spectrum |
| CN103887693A (en) * | 2014-03-07 | 2014-06-25 | 中国科学院上海光学精密机械研究所 | Ultrashort laser pulse femtosecond magnitude delay synchronization method |
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2015
- 2015-07-16 CN CN201510416830.7A patent/CN105024270A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1560699A (en) * | 2004-02-16 | 2005-01-05 | �й���ѧԺ�Ϻ���ѧ���ܻ�е�о��� | Superquick pulse x-ray phase contrast imaging device |
| WO2006107765A1 (en) * | 2005-04-05 | 2006-10-12 | The Board Of Trustees Of The Leland Stanford Junior University | Femtosecond spectroscopy using minimum phase functions |
| CN101520955A (en) * | 2008-12-05 | 2009-09-02 | 中国工程物理研究院激光聚变研究中心 | Accurate delay measuring and controlling method of two ultra-short pulse lasers |
| 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 |
| CN102545011A (en) * | 2012-02-22 | 2012-07-04 | 中国科学院上海光学精密机械研究所 | Adjustment and control device and method for ultra intense and ultra short laser pulse super-continuum spectrum |
| CN103887693A (en) * | 2014-03-07 | 2014-06-25 | 中国科学院上海光学精密机械研究所 | Ultrashort laser pulse femtosecond magnitude delay synchronization method |
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