CN1444024A - Device for precisely measuring ultrashort laser pulse time synchronization - Google Patents
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Abstract
A time synchronizer for precisely measuring the ultrashort laser pulses is composed of a thin reflecting-transmitting mirror for outputting a collinear laser beam, a 1/4 wave plate and polarizing plate for dividing two beams of laser beams with similar intensity and vertical polarization directions into a nonlinear crystal, a linear crystal for mutual action between pulses in nonlinear crystal to obtain a series of secondary harmonic pulses, a linear array CCD connected with oscilloscope for measuring the distribution of secondary harmonic pulses in space, a series of pulse waveforms on oscilloscope, and a time delay unit for measuring the time delay between multiple ultrashort pulses. The device of the invention can precisely measure the time delay between the ultrashort laser pulses, has high measurement precision reaching fs magnitude and small measurement error.
Description
Technical field:
The present invention a kind ofly converges in the mutual time synchronized of ultrashort laser pulse of space point or the device of time-delay about two of accurate measurements, be applicable to that mainly two wavelength of precision measurement are identical, identical or the orthogonal ultrashort laser pulse in polarization direction converges in the space and puts mutual time delays length, is applied to the laser research field.
Background technology:
In some important application of ultrashort laser pulse, for example in ultrashort laser pulse and matter interaction Physical Experiment and the little machining experiment of ultrashort laser pulse, require the different operation wavelength of two powers identical, identical or the orthogonal ultrashort laser pulse in polarization direction spatially pools a bit, and require to keep between the ultrashort laser pulse certain time interval, this just requires interpulse mutual time-delay to be measured accurately, in the hope of obtaining correct time time-delay and the synchronous situation between ultrashort pulse.Just require interpulse Time delay measurement that the precision of fs level is arranged for the Time delay measurement between the ultrashort pulse of fs level.Formerly in the technology, people such as C.Y.Chien provide a kind of typical regulating device (Optics Letters, Vol.25, No.8,578-580,2000), and its light path arrangement is seen shown in Figure 1.Pulse is directly incident on the nonlinear crystal KDP sheet 5 as pump light in the ultrashort laser pulse that pulse width is 2ps, and another operation wavelength is identical, the ultrashort laser pulse of polarization direction and the orthogonal 2ps of pump light pulse is incided on the catoptron 1 as detecting optical pulses, reflex on the catoptron 4 by catoptron 1, reflex to again on the catoptron 3, by after catoptron 2 reflections, detecting optical pulses incides on the nonlinear crystal KDP sheet 5 of II saphe coupling at last.The space intersection point of pump light pulse and detecting optical pulses is in nonlinear crystal KDP sheet 5.Catoptron 3 and catoptron 4 mutual angles are the right angle, form right angle reflector 6, and right angle reflector 6 can reflect back the contrary direction of detecting optical pulses along incident direction, and right angle reflector 6 can move forward and backward along the incident direction of detecting optical pulses.When detecting optical pulses and pump light pulse arrive on the nonlinear crystal KDP sheet 5 simultaneously, on nonlinear crystal KDP sheet 5, produce second harmonic, by moving forward and backward corner reflector 6 along the detecting optical pulses incident direction, can obtain two spaces time-delays between the light pulse by the displacement of measuring right angle reflector 6, can convert then obtains time delays between the pulse.
In said apparatus, fetch between the measurement of the time-delay between the pulse and obtain by displacement, but the measuring accuracy of mobile platform or vernier caliper generally is up to 10 μ m, with respect to the time measurement precision be＞33fs, and there are machine error and a reading error equal error, this precision is for the adjusting and the measurement of synchronizing relay between the ultrashort pulse of pulse width＜50fs, precision is not enough, also have a kind of device that utilizes piezoelectric ceramics to control the time-delay light path can obtain very high precision, but reading is inconvenient and cost an arm and a leg, and the distance that piezoelectric ceramics moves is limited, generally at tens microns, the dynamic range of corresponding measurement ultrashort pulse interbody spacer and all requires the polarization direction between the two-beam vertical mutually just in 500 femtoseconds, can satisfy II saphe matching condition generation second harmonic.
Summary of the invention:
The technical problem to be solved in the present invention is to overcome the deficiency of above-mentioned technology formerly, and a kind of device of precision measurement ultrashort laser pulse time synchronized is provided, to reach the measuring accuracy height, fs magnitude, the purpose that measuring error is little.
The basic thought of technical solution of the present invention is to utilize a thin reflection-diaphotoscope the wavelength of conllinear is not identical with two, identical or the orthogonal ultrashort laser pulse of converging in polarization direction is gathered into a branch of dipulse light beam at convergent point, the beam splitter of forming by a quarter wave plate and polaroid is divided into the orthogonal light in equicohesive two bundle polarization directions, incide jointly on the nonlinear crystal sheet, acquisition frequency multiplication output postpones by measuring the relative time that the relative position of a plurality of frequency doubled lights in the space obtain between a plurality of pulses.
Technical solution of the present invention is as follows:
A kind of device of precision measurement ultrashort laser pulse time synchronized, its light path arrangement as shown in Figure 2.It is characterized in that it mainly comprises: thin reflection-diaphotoscope 8,45 ° of total reflective mirrors 7, the beam splitter 18 that constitutes by quarter wave plate 11 and polaroid 10, total reflective mirror 12, by 45 ° of total reflective mirrors 13 and 45 ° of 14 total reflective mirror right angle and form right angle reverberator 15 each other, total reflective mirror 16, total reflective mirror 19, nonlinear crystal KDP sheet 22, line array CCD 21 and oscillograph 9, its position relation is as follows: thin reflection-diaphotoscope 8 places the convergent point of the light beam to be measured of two different directions incidents, this two-beam pulse is gathered into the dipulse light beam of a branch of parallel outgoing, reflection through 45 ° of total reflective mirrors 7 enters beam splitter 18, quarter wave plate 11 in the beam splitter 18 is used for incident light is become circularly polarized light, substantially equate and the orthogonal two bundle laser in polarization direction through polaroid 10 formation intensity, its reflected light is through total reflective mirror 12, right angle reflector 15 and total reflective mirror 16 are mapped on the nonlinear crystal KDP sheet 22, polarized light by polaroid 10 transmissions reflexes on the nonlinear crystal KDP sheet 22 through total reflective mirror 19, interaction produces second harmonic to this orthogonal laser pulse in two bundle polarization directions with crystal in crystal, survey this second harmonic in the position in space by line array CCD 21, oscillograph 9 connects linear array CCD21.
In order to improve device, between total reflective mirror 19 and nonlinear crystal KDP sheet 22, also has catoptron 20 and 21, as shown in Figure 3.
Described right angle reflector (15) can move forward and backward along the incident light direction.
The device of described precision measurement ultrashort laser pulse time synchronized will be calibrated before use, and calibration comprises following measurement concrete steps:
(1) at first will approach reflection-diaphotoscope 8 and be placed on two pulsed light beams to be measured on the intersection point in space, regulate the direction of thin reflection-diaphotoscope 8, make a light beam incide thin reflection-diaphotoscope 8 parts and see through thin reflection-diaphotoscope 8 outgoing, and the light beam part that another bundle incides on the thin reflection-diaphotoscope 8 is reflected by thin reflection-diaphotoscope 8, and forms co-linear beams;
(2) reflect a branch of directional light that enters in the correlation-measuring instrument 17 by 45 ° of total reflective mirrors 7, at first regulate quarter wave plate 11 and make and become circularly polarized light, polaroid 10 is divided into the essentially identical two-way of intensity polarization direction vertical reflection and transmission-polarizing light with the circularly polarized light of incident;
(3) after a branch of polarized light of going out by polaroid 10 transmissions reflects through total reflective mirror 19, incide on the nonlinear crystal KDP sheet 22;
(4) a branch of polarized light by polaroid 10 reflections reflects the reverberator 15 that meets at right angles that enters by 45 ° of total reflective mirrors 13 and 45 ° of total reflective mirror 14 structures through total reflective mirror 12, through total reflective mirror 16 this bundle polarized light is reflexed on the nonlinear crystal KDP sheet 22 again;
(5) block a direction and incide the pulse that approaches on the reflection-diaphotoscope 8, only stay any one monopulse incident, regulate the position of right angle reflector 15 before and after careful, the second harmonic that feasible two bundle polarized lights on inciding nonlinear crystal KDP sheet 22 produce nonlinear crystal KDP sheet 22 is along the angular bisector outgoing of two bundle incident polarized light; Show this moment from the light path of the orthogonal two-way light beam arrival in the two-way polarization direction of beam splitter 18 outputs nonlinear crystal KDP sheet 20 identical.
(6 pulses that will incide on the thin reflection-diaphotoscope 8 all let slip, and produce three second harmonic pulses that the space exit direction is different on nonlinear crystal KDP sheet 22, incide on the line array CCD 23;
(7) multipulse signal that on test linear array CCD21 on the oscillograph 9, collects.
(8) mobile then right angle reflector 15 changes the light path of one road polarized light, and movable length is L, is measuring the change amount T that incides the second harmonic position on the line array CCD 21 on the oscillograph 9
0, the recurrent interval Δ T time corresponding that then obtains on the oscillograph 9 is:
t＝2LΔT/T
0C
C is the light velocity in the vacuum in the formula.
Principle of the present invention is seen Fig. 4.At first two ultrashort pulses in space are merged into the parallel beam of a branch of dipulse, are divided into the essentially identical two bundle dipulse parallel beams of intensity then.With mutual delay is that the dipulse of Δ t is an example, close A that Shu Houzai is divided into and B two-way dipulse light beam in nonlinear crystal KDP sheet 22, three kinds of interaction modes just like Fig. 4 (a), Fig. 4 (b) and Fig. 4 (c) description, the second harmonic that will produce the outgoing of three beams different directions in the space incides on the line array CCD 21, and shows the pulse waveform shown in Fig. 4 (d) on oscillograph 9.Three pulses are equally spaced, and interval delta T is with regard to the time-delay Δ t between the corresponding dipulse.According to the result of calibration, just can extrapolate pulse delay Δ t from the recurrent interval Δ T that oscillograph 9 shows.
The principle of measuring is, when A road light and B road light were staggered in crystal, two pulses in the light of A road and two pulse meetings in the light of B road were intersected four positions respectively.Wherein, Fig. 4 (a) is when the previous pulse in previous pulse in the light of A road and the B road light is intersected, because identical time-delay is arranged, a back pulse and the back pulse in the light of B road in nonlinear crystal KDP sheet 20 in same A road, the position light are intersected; When Fig. 4 (b) intersects when the back pulse in the light of A road and the previous pulse in the light of B road, because with different time-delay among Fig. 4 (a), so their intersection points in nonlinear crystal KDP sheet 20 are also different with the intersection point under Fig. 4 (a) situation, when Fig. 4 (c) intersects when the back pulse in previous pulse in the light of A road and the B road light, because with different time-delay among Fig. 4 (a), Fig. 4 (b), so their intersection points in nonlinear crystal KDP sheet 20 are also different with the intersection point under Fig. 4 (a), Fig. 4 (b) situation.Simultaneously because the time-delay of former and later two pulses is identical, so three intersection points in the nonlinear crystal KDP sheet 20 are equidistant.Between the intersection point under intersection point on the time-delay Δ t of two ultrashort pulses in space and the nonlinear crystal KDP sheet 20 under Fig. 4 (a) situation and Fig. 4 (b) situation apart from x
0The pass be:
Wherein is that two-beam incides the angle on the nonlinear crystal KDP sheet 20, and n is the refractive index of nonlinear crystal KDP sheet 20.x
0The recurrent interval Δ T that shows on oscillograph 9 just can extrapolate recurrent interval Δ t from the recurrent interval Δ T that oscillograph 9 shows.
Compare with first technology, the present invention has outstanding feature:
1, adopt thin reflection-diaphotoscope that the pulse of two different directions incidents is merged into the directional light of a branch of dipulse, beam splitting converges in the nonlinear crystal sheet and produces second harmonic then.And be that two pulses directly produce second harmonic in the nonlinear crystal sheet in the technology formerly.
2, after calibration, do not need to change light path in the time of measurement, measuring method is simple, does not have machine error and reading error.And formerly in the technology, need measure interval between the pulse by the position of mobile right angle reflector.
3, the precision height of Ce Lianging can reach the magnitude of fs.And formerly in the technology, owing to be subjected to the restriction of screw rod precision, the magnitude of the precision＞33fs of measurement.
4, two beam pulse light can be angles at any angle, and formerly in the technology angle of two-beam be subjected to the restriction of the matching angle of crystal.
5, do not need to adopt expensive components such as piezoelectric ceramics, and it is big to measure dynamic range, can reaches the magnitude of ps.
Description of drawings:
Fig. 1 is the structural representation of ultrashort laser pulse time synchronism apparatus of technology precision measurement formerly and method.
Fig. 2 is precision measurement ultrashort laser pulse time synchronism apparatus embodiment one structural representation of the present invention.
Fig. 3 is precision measurement ultrashort laser pulse time synchronism apparatus embodiment two structural representations of the present invention.
Fig. 4 is the schematic diagram of precision measurement ultrashort laser pulse method for synchronizing time of the present invention.
Fig. 5 is an oscillogram of utilizing precision measurement ultrashort laser pulse time synchronism apparatus of the present invention to measure.
Embodiment:
See also Fig. 2, Fig. 3 earlier, ultrashort pulse time synchronized precision measurement apparatus of the present invention mainly comprises: thin 8,45 ° of total reflective mirrors 7 of reflection-diaphotoscope.The beam splitter 18 that quarter wave plate 11 and polaroid 10 constitute.To reflex in the beam splitter 18 by the light of thin reflection-diaphotoscope 8 outputs by 45 ° of total reflective mirrors 7.45 ° of total reflective mirrors 13 and 45 ° of total reflective mirror 14 mutual angles are the right angle, form right angle reverberator 15, and right angle reflector 15 can move forward and backward along the incident light direction.Right angle reflector 15, total reflective mirror 12, total reflective mirror 16, total reflective mirror 19 place between beam splitter 18 and the nonlinear crystal KDP sheet 22.Right angle reflector 15, total reflective mirror 12, total reflective mirror 16, total reflective mirror 19, beam splitter 18, nonlinear crystal KDP sheet 22 and line array CCD 21 common formation correlation-measuring instruments 17.Place the line array CCD 21 behind the nonlinear crystal KDP sheet 20 to be connected on the oscillograph 9.
As mentioned above, apparatus of the present invention comprise: thin reflection-diaphotoscope 8, be used for the ultrashort laser pulse of converging of two different directions incidents to be measured is gathered into the light beam of the dipulse of a branch of parallel outgoing, thin reflection-diaphotoscope 8 thickness are 2 μ m, place the convergent point of two-beam.Different according to the angle of incident light and intensity, thin corresponding reflection of reflection-diaphotoscope 8 platings and transmission film, make a branch of light beam that incides on the thin reflection-diaphotoscope 8 partly see through thin 45 ° of total reflective mirrors 7 of reflection-diaphotoscope 8 directives, and the light beam part that another bundle incides on the thin reflection-diaphotoscope 8 is reflected by thin reflection-diaphotoscope 8, along 45 ° of total reflective mirrors 7 of transmission direction of light incident, make that the intensity of two conllinear pulses of 45 °-total reflective mirror of incident 7 is close.45 ° of total reflective mirrors 7 are used for reflected light.Quarter wave plate 11 and polaroid 10 constitutes beam splitters 18, and being used for a branch of light with incident, to be divided into intensity equal substantially, and the orthogonal two bundle laser in polarization direction, wherein quarter wave plate 11 is used for the polarization of incident light direction is become circularly polarized light.Total reflective mirror 12, right angle reflector 15 and total reflective mirror 16 will reflex on the nonlinear crystal KDP sheet 22 by a branch of polarized light of the 10 reflection outputs of polaroid in the beam splitter 18.Total reflective mirror 19 will reflex on the nonlinear crystal KDP sheet 22 by another bundle polarized light of polaroid 10 transmissions output in the beam splitter 18.Right angle reflector 15 can be extended into to be penetrated light direction and moves forward and backward, be used to regulate light path, make from the polaroid 10 equivalent optical paths on the two bundle polarized lights arrival nonlinear crystal KDP sheets 22 of reflection respectively and transmission by this road polarized light of polaroid 10 reflection outputs.This orthogonal light in two bundle polarization directions intersects in nonlinear crystal KDP sheet 20.Nonlinear crystal KDP sheet 22 is according to the cutting of II saphe coupling angle, and interaction produces second harmonic to the orthogonal laser pulse in polarization direction with crystal in crystal.Place the line array CCD 21 behind the nonlinear crystal KDP sheet 22 to be used to survey the position of second harmonic in the space.Oscillograph 9 connects linear array CCD21 and is used to measure the pulse signal that collects on the CCD.
In apparatus and method of the present invention, according to the difference of ultrashort laser pulse operation wavelength, various optical elements need and the operation wavelength correspondence in the device.Apparatus of the present invention and method are applicable to the time synchronized between the identical identical or orthogonal pulse in two polarization directions of wavelength and the measurement of time-delay.Adopting thin reflection-diaphotoscope 8 is the light beams that are used for the ultrashort laser pulse of converging of two different directions incidents to be measured is gathered into the dipulse of a branch of parallel outgoing, and beam splitter 18 to be laser beam with a branch of incident be divided into the laser beam that two-way intensity equates substantially, the polarization direction is vertical.Owing to be measurement to ultrashort laser pulse, adopted transmission optical component in the beam splitter 18, require various transmission optical components thinner, avoiding causing ultrashort laser pulse to pass through transmission optical component afterpulse width opens up too widely and pulse peak power decline, influence last second harmonic output, although pulse strenching does not influence the precision of measurement.
Above-mentioned precision measurement ultrashort laser pulse time synchronism apparatus, its structure as shown in Figure 2, the precision measurement ultrashort laser pulse time synchronism apparatus that the present invention describes was needing to calibrate before formal the measurement.The step of calibration is as follows:
(1) at first will approach reflection-diaphotoscope 8 and be placed on dipulse on the intersection point in space, regulate the direction of thin reflection-diaphotoscope 8, make a branch of light beam that incides on the thin reflection-diaphotoscope 8 partly see through thin reflection-diaphotoscope 8 outgoing, and the light beam part that another bundle incides on the thin reflection-diaphotoscope 8 is reflected by thin reflection-diaphotoscope 8, make that along the exit direction outgoing of transmitted light this two bundle is respectively through approaching the light-beam collinear of 8 reflections of reflection-diaphotoscope and transmission output.
(2), will be reflected into by right angle reflector 15 total reflective mirror 12 by a branch of directional light of thin reflection-diaphotoscope 8 outputs through 7 reflections of 45 ° of total reflective mirrors, total reflective mirror 16, total reflective mirror 19, beam splitter 18 is in the correlation-measuring instrument 17 that nonlinear crystal KDP sheet 20 and line array CCD 21 are formed.
(3) a branch of directional light that enters in the correlation-measuring instrument 17 by 7 reflections of 45 ° of total reflective mirrors at first enters in the beam splitter of being made up of quarter wave plate 11 and polaroid 10 18 through quarter wave plate 11, regulate quarter wave plate 11 and change the polarization of incident light attitude, make that a branch of directional light incide on the polaroid 10 by quarter wave plate 11 is a circularly polarized light, polaroid 10 is divided into the circularly polarized light of incident that the vertical linear polarization directional light in the essentially identical two-way of intensity polarization direction reflects respectively and beam splitter 18 is derived in transmission.
(4) after a branch of polarized light of going out by polaroid 10 transmissions reflects through total reflective mirror 19, incide on the nonlinear crystal KDP sheet 20.
(5) a branch of polarized light that reflects away by polaroid 10 reflects in the reverberator 15 that meets at right angles that enters by 45 ° of total reflective mirrors 13 and 45 ° of total reflective mirror 14 structures through total reflective mirror 12, light beam is reflexed on the total reflective mirror 16 by right angle reflector 15 then, and total reflective mirror 16 incides this bundle polarized light on the nonlinear crystal KDP sheet 20 equally.The orthogonal polarized light in polarization direction that two-way incides on the nonlinear crystal KDP sheet 20 intersects in nonlinear crystal KDP sheet 20, the angle of cut of two-beam～10 degree.
(6) reverberator 15 that meets at right angles by 45 ° of total reflective mirrors 13 and 45 ° of total reflective mirror 14 structures can will reflex on the total reflective mirror 16 along its contrary direction from the light beam of total reflective mirror 12 incidents, and right angle reflector 15 can move forward and backward along the incident direction of light from total reflective mirror 12 incidents and the light path that keeps reflexing on the total reflective mirror 16 is constant.
(7) block a direction and incide the pulse that approaches on the reflection-diaphotoscope 8, only stay any one monopulse incident, regulate the position of right angle reflector 15 before and after careful, make that two bundle polarized lights on inciding nonlinear crystal KDP sheet 20 produce the angular bisector outgoing of second harmonic along two bundle incident polarized light nonlinear crystal KDP sheet 20.Show this moment from the light path of the orthogonal two-way light beam arrival in the two-way polarization direction of beam splitter 18 outputs nonlinear crystal KDP sheet 20 identical.
(8) pulse that will incide on the thin reflection-diaphotoscope 8 all lets slip, and produces three second harmonic pulses that the space exit direction is different on nonlinear crystal KDP sheet 20, incides on the line array CCD 21.
(9) showing the multipulse signal that collects on the linear array CCD21 on the oscillograph 9.
Identical with above-mentioned steps from step (1) to step (9), mobile then right angle reflector 15 changes the light path of one road polarized light, and movable length is L, is measuring the change amount T that incides the second harmonic position on the line array CCD 21 on the oscillograph 9
0, the recurrent interval Δ T time corresponding that then obtains on the oscillograph 9
t＝2LΔT/T
0C
C is the light velocity in the vacuum in the formula.
Movable length L and corresponding T thereof
0Can repeatedly measure and average, reduce the error of machinery and linear measure longimetry reading, increase the precision of calibration.
Movable length L and corresponding T thereof
0Can repeatedly measure and average, reduce the error of machinery and linear measure longimetry reading, increase the precision of calibration.
Use structure as shown in Figure 3, in the interaction experiment of ultrashort pulse and semiconductor substance, the identical linearly polarized light ultrashort pulse in polarization direction that to have two pulsewidths be 50fs converges to a bit in the space, respectively as pumping pulse and direct impulse, merge into a branch of dipulse directional light by thin reflection-diaphotoscope 8 and be reflected in the correlation-measuring instrument 17, change linearly polarized light into circularly polarized light by quarter wave plate 11 by 45 ° of total reflective mirrors 7.Produce the three beams second harmonic and output on the line array CCD 23 in nonlinear crystal KDP sheet 22, display waveform is seen Fig. 5 on oscillograph.Obtain by calibration that reading 4ms is spaced apart 1.432ms between two adjacent pulses corresponding to 1125fs among Fig. 5 on oscillograph, therefore measure the 403fs that is spaced apart between two pulses.
Claims (4)
1, a kind of device of precision measurement ultrashort laser pulse time synchronized, it is characterized in that it mainly comprises: thin reflection-diaphotoscope (8), 45 ° of total reflective mirrors (7), beam splitter (18) by quarter wave plate (11) and polaroid (10) formation, total reflective mirror (12), by 45 ° of total reflective mirrors (13) and 45 ° of total reflective mirrors (14) right angle and form right angle reverberator (15) each other, total reflective mirror (16), total reflective mirror (19), nonlinear crystal KDP sheet (22), line array CCD (21) and oscillograph 9, its position relation is as follows: thin reflection-diaphotoscope (8) places the convergent point of the light beam to be measured of two different directions incidents, this two-beam pulse is gathered into the dipulse light beam of a branch of parallel outgoing, reflection through 45 ° of total reflective mirrors (7) enters beam splitter (18), quarter wave plate (11) in the beam splitter (18) is used for incident light is become circularly polarized light, substantially equate and the orthogonal two bundle laser in polarization direction through polaroid (10) formation intensity, its reflected light is through total reflective mirror (12), right angle reflector (15) and total reflective mirror (16) are mapped on the nonlinear crystal KDP sheet (22), polarized light by polaroid (10) transmission reflexes on the nonlinear crystal KDP sheet (22) through total reflective mirror (19), interaction produces second harmonic to this orthogonal laser pulse in two bundle polarization directions with crystal in crystal, survey the position of this second harmonic in the space by line array CCD (21), oscillograph (9) connects line array CCD (21).
2, the device of precision measurement ultrashort laser pulse time synchronized according to claim 1 is characterized in that in the transmitted light path, also has catoptron (20,21) between total reflective mirror (19) and nonlinear crystal KDP sheet (22).
3, the device of precision measurement ultrashort laser pulse time synchronized according to claim 1 is characterized in that described right angle reflector (15) can move forward and backward along the incident light direction.
4, the calibrating method of the device of precision measurement ultrashort laser pulse time synchronized according to claim 1 is characterized in that comprising following concrete steps:
(1) at first will approach reflection-diaphotoscope (8) and be placed on two pulsed light beams to be measured on the intersection point in space, regulate the direction of thin reflection-diaphotoscope (8), make a light beam incide thin reflection-diaphotoscope (8) part and see through thin reflection-diaphotoscope (8) outgoing, and the light beam part that another bundle incides on the thin reflection-diaphotoscope (8) is reflected by thin reflection-diaphotoscope (8), and forms co-linear beams;
(2) reflect a branch of directional light that enters in the correlation-measuring instrument (17) by 45 ° of total reflective mirrors (7), at first regulate quarter wave plate (11) and make and become circularly polarized light, polaroid (10) is divided into the essentially identical two-way of intensity polarization direction vertical reflection and transmission-polarizing light with the circularly polarized light of incident;
(3) after a branch of polarized light of going out by polaroid (10) transmission reflects through total reflective mirror (19), incide on the nonlinear crystal KDP sheet (22);
(4) a branch of polarized light by polaroid (10) reflection reflects the reverberator that meets at right angles (15) that enters by 45 ° of total reflective mirrors (13) and 45 ° of total reflective mirrors (14) structure through total reflective mirror (12), through total reflective mirror (16) this bundle polarized light is reflexed on the nonlinear crystal KDP sheet (22) again;
(5) block a direction and incide the pulse that approaches on the reflection-diaphotoscope (8), only stay any one monopulse incident, regulate the position of right angle reflector (15) before and after careful, the second harmonic that feasible two bundle polarized lights on inciding nonlinear crystal KDP sheet (22) produce nonlinear crystal KDP sheet (22) is along the angular bisector outgoing of two bundle incident polarized light; Show from the light path of the orthogonal two-way light beam arrival nonlinear crystal KDP sheet in the two-way polarization direction that beam splitter (18) is exported (22) identical this moment.
(6 pulses that will incide on the thin reflection-diaphotoscope (8) all let slip, and go up at nonlinear crystal KDP sheet (22) and produce three second harmonic pulses that the space exit direction is different, incide on the line array CCD (23);
(7) go up the multipulse signal that collects on the test line array CCD (21) at oscillograph (9).
(8) mobile then right angle reflector (15) changes the light path of one road polarized light, and movable length is L, goes up at oscillograph (9) and measures the change amount T that incides the second harmonic position on the line array CCD (21)
0, the recurrent interval Δ T time corresponding that then obtains on the oscillograph (9) is:
t＝2LΔT/T
0C
C is the light velocity in the vacuum in the formula.
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| CN100393105C (en) * | 2005-12-05 | 2008-06-04 | 中国科学院武汉物理与数学研究所 | Apparatus for synchronizing camera with supershort pulse laser lighting |
| CN104964751A (en) * | 2015-07-01 | 2015-10-07 | 北京无线电计量测试研究所 | Device and method for relative time synchronization based on ultrashort pulses |
| CN105157857A (en) * | 2015-09-21 | 2015-12-16 | 中国工程物理研究院上海激光等离子体研究所 | Ultra-short pulse time synchronization measurement device and measurement method |
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2003
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100373143C (en) * | 2004-07-13 | 2008-03-05 | 中国科学院上海光学精密机械研究所 | Double-color field X-ray cross correlation measuring instrument |
| CN100393105C (en) * | 2005-12-05 | 2008-06-04 | 中国科学院武汉物理与数学研究所 | Apparatus for synchronizing camera with supershort pulse laser lighting |
| CN104964751A (en) * | 2015-07-01 | 2015-10-07 | 北京无线电计量测试研究所 | Device and method for relative time synchronization based on ultrashort pulses |
| CN105157857A (en) * | 2015-09-21 | 2015-12-16 | 中国工程物理研究院上海激光等离子体研究所 | Ultra-short pulse time synchronization measurement device and measurement method |
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