CN106647096A - Double-switching-pulse type femtosecond optical Kerr-gate and implementation method thereof - Google Patents
Double-switching-pulse type femtosecond optical Kerr-gate and implementation method thereof Download PDFInfo
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- CN106647096A CN106647096A CN201710093448.6A CN201710093448A CN106647096A CN 106647096 A CN106647096 A CN 106647096A CN 201710093448 A CN201710093448 A CN 201710093448A CN 106647096 A CN106647096 A CN 106647096A
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/3511—Self-focusing or self-trapping of light; Light-induced birefringence; Induced optical Kerr-effect
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/3515—All-optical modulation, gating, switching, e.g. control of a light beam by another light beam
Abstract
The invention discloses a double-switching-pulse type femtosecond optical Kerr-gate and an implementation method thereof. The double-switching-pulse type femtosecond optical Kerr-gate and the implementation method thereof have the advantages that switching pulse of a traditional optical Kerr-gate is divided into two beams, an optical path of a first switching pulse beam is as same as traditional switching light, a polarization direction of a second switching pulse beam is adjusted to be perpendicular to a first switching light polarization direction through a half-wave plate, and attenuation slices and optical delay lines can adjust the intensity and the optical length; the second switching pulse beam is introduced, the intensity and relative delay time of the second switching pulse beam are adjusted continuously relatively to the first switching pulse beam, and then the optical Kerr-gate is effectively controlled by the second switching pulse beam in a first switching pulse excitation turn-off phase, so that transmittance of the optical Kerr-gate can mainly depend on the first switching pulse beam, switching-off time of the optical Kerr-gate is greatly shortened under regulation of the second switching pulse beam, and high transmittance and ultrafast switching time of the femtosecond optical Kerr-gate are achieved.
Description
Technical field
The invention belongs to supper-fast imaging and field of measuring technique, be related to a kind of biswitch pulse femtosecond light Kerr-gate and
Its implementation.
Background technology
Develop supper-fast imaging and e measurement technology, in transient states such as high velocity impact, detonation process, electrion, vision mechanisms
, there is important using value in process study field.Generally, the high time of millisecond to subpicosecond can be realized using photoelectric technology
Resolution imaging, but in molecular structure kinetics is supper-fast surface vibration process, most time resolved fluorometric micro-imaging, strong
The research fields such as scattering object internal objects identification, it is necessary to which using the ultra-fast imaging techniques based on photon technology, such as femtosecond is complete
Breath imaging and nonlinear optics door gated imaging technique.
Light Kerr-gate gating imaging technique is a kind of typical nonlinear optics door gated imaging technique.This imaging technique
The optical shutter constructed using optical kerr effect, commonly known as light Kerr-gate, it gates photon efficiency without the need for phase matched
Height, the switch time for possessing reachable femtosecond magnitude.Therefore, light Kerr-gate gating imaging technique record in ultrafast dynamic process, it is high
The research fields such as time-resolved fluorescence microtechnique, the identification of strong scatterer internal objects, are widely used, with important
Scientific meaning and using value.
In traditional light Kerr-gate gating imaging technique, in order to ensure higher Signature penetrating rate, light gram is often required that
Your medium has a nonlinear effect of higher-strength, and the nonlinear optical effect origin of this kind of material usually contains heavy non-
Electronic response mechanism.Such as most currently used light kerr medium Carbon bisulfide, its third-order nonlinear optical effect is main
Source and Molecular reorientation effect, after switching pulse excitation disappears, can be present the longer molecular relaxation time in it, cause with two
Nitric sulfid increases for the light Kerr-gate shut-in time of medium, and the temporal resolution of gated imaging is restricted.On the other hand, light gram
If your door originates from completely the light kerr medium of electronic response, such as quartz glass, its switch time using nonlinear response
Will be very fast, the width of switching pulse is primarily limited to, but the optical nonlinearity intensity of this kind of material is often weaker, formation
Under equal conditions, Signature penetrating rate is relatively low for light Kerr-gate.Therefore, various technologies are developed, while lifting the switch of light Kerr-gate
Time and transmitance, for its application has very important significance.
The content of the invention
It is an object of the invention to provide the femtosecond light Ke Er of high permeability, fast switch time is realized in a kind of biswitch pulse
The method and its device of door.
To reach above-mentioned purpose, the technical solution used in the present invention is：
A kind of femtosecond light Kerr-gate device of biswitch pulse includes femto-second laser, in the transmitting light path of femto-second laser
The first beam splitting chip is provided with, light path is divided into detection light path and switch light path by the first beam splitting chip, wherein setting successively in detection light path
There are the second attenuator, the second convex lenss, the polarizer, light kerr medium, analyzer, the 3rd convex lenss, long pass filter and detection
Device, makes detection light by the light Kerr-gate gating of biswitch light；The polarization direction of the polarizer detects arteries and veins with the femtosecond in detection light path
The polarization direction washed off is identical, and the polarization direction of analyzer is vertical with the polarization direction of femtosecond direct impulse light.In switch light path
It is sequentially provided with the first optical time delay line for adjusting the light path of switching pulse and for switch light to be divided into into second point of two beams
Beam piece；First beam switch light through the 3rd attenuator, the second half-wave plate, by the polarization direction of first switch pulsed light be adjusted to
Detection light polarization direction reaches light kerr medium into 30 °～60 °, then through the 4th convex lenss；Second beam switch light is through being used for
First attenuator of adjustment light intensity, the second optical time delay line for adjusting the second beam switch pulse light path, through the first half
Wave plate, is adjusted to vertical with first switching pulse polarization direction by its polarization direction, then through the first convex lenss, reaches light gram
That medium.And two beam femtosecond switching pulse light incide locus inside light kerr medium with femtosecond direct impulse light in light
Locus inside kerr medium overlap.
There is regular hour delay between two separate beam switch light, be equivalent to two light Kerr-gates for successively occurring.
Second light Kerr-gate is approximately on a timeline the dwell period of first light Kerr-gate, two in this period light gram
You produce the effect cancelled out each other at effect, so as to accelerate the closing velocity of light Kerr-gate；The relative position of two doors can be by the
Two optical time delay lines are adjusted, and the switching pulse intensity rate of two doors can be adjusted by the first attenuator.
Described femto-second laser is the fs-laser system containing amplifier；
Described the first beam splitting chip and the splitting ratio of the second beam splitting chip is 1:(1～4).
First, second, and third described attenuator is neutral filter, including the neutral filter of fixed optical density (OD)
Or variable neutral density attenuator.
Accurate stepping mobile platform and put that described the first optical time delay line and the second optical time delay line is controlled by computer
The two orthogonal reflecting mirrors put on accurate stepping mobile platform are constituted, and two orthogonal reflecting mirrors are opened femtosecond
GUAN-pulse is washed off carries out retroreflection；Accurate stepping mobile platform is adjusted to the light path of femtosecond switching pulse light, adjustment essence
Spend for 1.5～15 microns, the minimum light path knots modification of the first optical time delay line and the second optical time delay line is 10～100fs.
Described the first half-wave plate and the second half-wave plate is zero-order half-wave piece, and its material is quartz material or BK glass.
The described polarizer and analyzer is that prism polarizers or extinction ratio are more than 104:1 thin film polarizer；Wherein rib
Mirror polariser includes Nicol polariser, Glan-Taylor prism polariser or wollaston prism polariser.
The light kerr medium for being used is third order non-linear optical material.
Described light kerr medium includes Carbon bisulfide, Nitrobenzol, carbon tetrachloride, benzene, NMP etc..
A kind of implementation method of the femtosecond light Kerr-gate of biswitch pulse, comprises the following steps：
1) beam splitting chips of femtosecond pulse Jing first of the polarization of femto-second laser outgoing are divided into into two beams, wherein a branch of work
For direct impulse light, another Shu Zuowei switching pulses light；
2) the second attenuators of femtosecond direct impulse light Jing decay, after the second convex lens focus, sequentially through the polarizer, light gram
That medium and analyzer, the wherein polarizer, light kerr medium and analyzer constitute femtosecond light Kerr-gate.Respectively adjust the polarizer and
Analyzer is to the parallel direction and vertical direction for detecting light polarization direction.
3) femtosecond switching pulse light is Jing after the first optical time delay line adjusts its light path, then is divided into two beams through the second beam splitting chip
Switching pulse light.
4) the first beam switch light incides light kerr medium through the 3rd attenuator, the second half-wave plate and the 4th convex lenss
On；It is 30 °～60 ° with detection light polarization direction to adjust the second half-wave plate and make the first beam switch light polarization direction, adjusts the first light
Learning delay line makes the first beam switch light light path identical with detection light.
5) the second beam switch light is through the first attenuator, the second optical time delay line, through the first half-wave plate and the first convex lens
Mirror is incided on light kerr medium；Adjusting the first half-wave plate makes the second beam switch light polarization direction and the first beam switch light polarization side
To vertical.Adjusting the second optical time delay line makes the second beam switch light light path identical with detection light.The first attenuator is adjusted to suitable
Position, makes the second beam switch light intensity be not higher than the first beam switch light, and keeps appropriate ratio.
6) light Ke Er signals are received according to detector, the accurate stepping mobile platform controlled using computer controls the first light
Delay line movement and Real-time Collection light Ke Er signal datas are learned, the light Ke Er signature tunes two beam switch light are acted on simultaneously under are obtained
Line.
7) the second optical time delay line is adjusted, makes second light Kerr-gate slightly lag behind first light Kerr-gate, be approximately at
Its dwell period.Repeat step 6), measure light Ke Er signal curves.
8) with step 7) in the light Ke Er intensity curves that measure as reference, re-start the second delay line and first and decline
Subtract the regulation of piece.Through adjusting repeatedly, when two beam switch light relative time delaies 0～1000fs and strength ratio 0～1 it is a certain
During value, the light Kerr-gate of high permeability and ultrafast switch time is obtained.
Compared with prior art, the invention has the advantages that：
The femtosecond light Kerr-gate technology of the biswitch light that the present invention is provided, by light path detection light path and switch light path are divided into.
Short bandpass filter, optical time delay line, beam splitting chip are set gradually in switch light path；It is divided into two beams, the first beam so as to switch light
Switch light is identical with traditional light Kerr-gate, and its polarization direction is adjusted with detection light polarization direction into 30 °～60 ° by half-wave plate；The
Two beam switch light sequentially pass through attenuator, and optical time delay line, half-wave plate enters light kerr medium after convex lenss.Second beam switch
Light slightly lags behind first switch light on light path, vertical with the first beam switch light polarization direction in polarization direction, is to medium
Molecule carries out second light Kerr-gate of back action.Second light Kerr-gate is approximately on a timeline first light Ke Er
The dwell period of door, two in this period optical kerr effect produces the effect cancelled out each other, so as to the closing of light Kerr-gate
The closing velocity in stage will be accelerated, so as under conditions of high permeability, hence it is evident that reduce light Kerr-gate switch time.Visit
Light-metering road is identical with traditional light Kerr-gate, through attenuator, convex lenss, the polarizer, light kerr medium, analyzer, convex lenss, length
Bandpass filter and detector, by the opening and closing of biswitch Pulse Width Control light Kerr-gate, realize to flashlight high permeability, height
The gating of temporal resolution, has important application in the fields such as the ultrafast fluorescence kinetics research of femtosecond time resolution rate
Value.
Femtosecond light Kerr-gate high permeability and the side of ultrafast switch time are realized in the utilization biswitch pulse that the present invention is provided
Method, is referred to and is adjusted by the intensity and relative position to two light Kerr-gates, to reach following condition：Second tunnel
Switch light intensity is not higher than the first way switch light, and keeps certain ratio；Double switch light polarization direction is mutually perpendicular to, and with spy
Light-metering polarization direction is into 30 °～60 °；Second light Kerr-gate slightly lags behind on a timeline first light Kerr-gate, about position
In its dwell period.Need in this process repeatedly using accurate stepping mobile platform measurement Ke Er signal curves, with this
It is to refer to just can further be adjusted.The femtosecond light Kerr-gate of traditional Single switch pulse, due to high permeability light Ke Er
Often there is the longer relaxation time in dielectric material, cause the shut-in time of its light Kerr-gate long；And the present invention is by introducing
Second beam switch pulse, and by constantly adjusting its relative intensity and the first relative delay for opening the light pulse so that light
Kerr-gate can be subject to the effective control of the second beam switch pulse in the dwell period of first switch pulse excitation, so that it is guaranteed that light gram
The transmitance of your door mainly receives first switch pulsing effect, and the shut-in time of light Kerr-gate is in the regulation and control of second switch pulse
Under, greatly shorten, and then while realize the high permeability of femtosecond light Kerr-gate and ultrafast switch time.
Description of the drawings
Fig. 1 is the schematic device of the biswitch pulsed femtosecond light Kerr-gate technology that the present invention is provided；
Fig. 2 is that (light kerr medium is CS using the light Ke Er intensity curves measured by the present invention2) and using tradition
The CS that light Kerr-gate is measured2, CCl4、NMP、C6H6The time resolution light Ke Er of these common smooth kerr mediums with quartz glass
The comparison diagram of intensity curves.
Fig. 3 is that (light kerr medium is CS using the light Ke Er intensity curves measured by the present invention2) and using tradition
The CS that light Kerr-gate is measured2, CCl4、NMP、C6H6The normalization time resolution of these common smooth kerr mediums with quartz glass
The comparison diagram of light Ke Er intensity curves.
Wherein：1 is femto-second laser, 2 is the first reflecting mirror, 3 is the first beam splitting chip, 4 is the first optical time delay line, 5 are
Second reflecting mirror, 6 be the 3rd reflecting mirror, 7 be the second beam splitting chip, 8 be the first attenuator, 9 be the secondth optical time delay line, 10 be
4th reflecting mirror, 11 be the first half-wave plate, 12 be the first convex lenss, 13 be the 5th reflecting mirror, 14 be the second attenuator, 15 be the
Two convex lenss, 16 be the polarizer, 17 be light kerr medium, 18 be analyzer, 19 be the 3rd convex lenss, 20 be detector, 21 be
6th reflecting mirror, 22 be the 3rd attenuator, 23 be the second half-wave plate, 24 be the 4th convex lenss.
Specific embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings.
The biswitch light femtosecond light Kerr-gate that the present invention is provided, is that the switch light of traditional light Kerr-gate is divided into into two beams, the
The light path of one beam switch light is identical with traditional switch light, through the second half-wave plate by the first beam switch light polarization direction be adjusted to
Detection light polarization direction angle is+30 °～+60 °, and the second beam switch light adjusts its intensity through attenuator, through the second optics
Delay line adjusts its light path relative to first switch light, by the first half-wave plate, by polarization direction be adjusted to with the first beam
Switch light polarization direction is vertical, then enters light kerr medium through the first convex lenss.Two beam switch light are geometrically symmetrical.It is logical
The second beam switch light of introducing is crossed, and by the suitably regulation to the second attenuator and the second optical time delay line so that first
The dwell period of light Kerr-gate can be subject to the effective control of second switch light.
As shown in figure 1, the biswitch pulsed light femtosecond light Kerr-gate that the present invention is provided, including femto-second laser 1, in femtosecond
The transmitting light path of laser instrument 1 is provided with the first beam splitting chip 3, and light path is divided into detection light path and switch light path by the first beam splitting chip 3, its
Be sequentially provided with middle detection light path the second attenuator 14, the second convex lenss 15, the polarizer 16, light kerr medium 17, analyzer 18,
3rd convex lenss 19 and detector 20, make detection light by the light Kerr-gate gating of biswitch light；The polarization direction of the polarizer 16 with
The polarization direction of the femtosecond direct impulse light in detection light path is identical, polarization direction and the femtosecond direct impulse light of analyzer 18
Polarization direction is vertical.The first optical time delay line 4 for adjusting the light path of switching pulse is sequentially provided with switch light path and be used for
Switch light is divided into into the second beam splitting chip 7 of two beams；First beam switch light through the 3rd attenuator 22, the second half-wave plate 23, by
It is 45 ° that the polarization direction of one switching pulse light is adjusted to detection light polarization direction angle, then through the 4th convex lenss 24, is reached
Light kerr medium 17；Second beam switch light is through for adjusting the first attenuator 8 of this way switch light intensity, for adjusting the
Second optical time delay line 9 of the light path of two beam switch pulses, through the first half-wave plate 11, by the polarization side of second switch pulsed light
It is vertical with the first beam switch light polarization direction to being adjusted to, then through the first convex lenss 12, reach light kerr medium 17.And two
Femtosecond switching pulse light incides the locus inside light kerr medium 17 and femtosecond direct impulse light in light kerr medium 17
Internal locus overlap.
Described femto-second laser contains the fs-laser system of amplifier；
Described the first beam splitting chip and the splitting ratio of the second beam splitting chip is 1:(1～4).
Described first, second, and third attenuator 8,14,22 is neutral filter, including the neutrality of fixed optical density (OD)
Attenuator or variable neutral density attenuator.
Accurate stepping mobile platform and put that described the first optical time delay line and the second optical time delay line is controlled by computer
The two orthogonal reflecting mirrors put on accurate stepping mobile platform are constituted, and two orthogonal reflecting mirrors are opened femtosecond
GUAN-pulse is washed off carries out retroreflection；Accurate stepping mobile platform is adjusted to the light path of femtosecond switching pulse light, adjustment essence
Spend for 1.5～15 microns, the minimum light path knots modification of the first optical time delay line and the second optical time delay line is 10～100fs.
Described the first half-wave plate and the second half-wave plate is zero-order half-wave piece, and its material is quartz material or BK glass.
The described polarizer and analyzer is that prism polarizers or extinction ratio are more than 104:1 thin film polarizer；Wherein rib
Mirror polariser includes Nicol polariser, Glan-Taylor prism polariser or wollaston prism polariser.
The light kerr medium for being used is third order non-linear optical material.
Described light kerr medium includes the non-fully electronic response such as Carbon bisulfide, Nitrobenzol, carbon tetrachloride, benzene, NMP
Light kerr medium.
The device preferred parameter of the femtosecond light Kerr-gate technology of the biswitch light of the present invention is as follows：
The single pulse energy of the femtosecond pulse of femto-second laser transmitting is 3mJ, and pulsewidth is 50fs, defeated through amplifier
Repetition rate 1kHz for going out；The splitting ratio of first, second beam splitting chip is 1:1, each beam light intensity is by three attenuator flexible；
The focal length of first, second, third, fourth convex lenss is respectively 15cm, 20cm, 15cm and 15cm；The polarizer and analyzer are
Nicol polariser, transparent aperture is 1.2cm；The minimum light path knots modification of optical time delay line is 10.4fs；With curing
Carbon is used as light kerr medium.
Femtosecond light Kerr-gate high permeability and the side of ultrafast switch time are realized in the utilization biswitch pulse that the present invention is provided
Method, is referred to and is adjusted by the intensity and relative position to two light Kerr-gates, to reach following condition：Second tunnel
Switch light intensity is not higher than the first way switch light；Double switch light polarization direction is mutually perpendicular to, and with detection light polarization direction into
30 °～60 °；Second light Kerr-gate slightly lags behind on a timeline first light Kerr-gate, is approximately at its dwell period.
Need during this repeatedly using accurate stepping mobile platform measurement Ke Er signal curves, just can enter to advance as reference
The adjustment of one step.The femtosecond light Kerr-gate of traditional Single switch pulse, due to often depositing for high permeability light kerr medium material
In the longer relaxation time, cause the shut-in time of its light Kerr-gate long；And the present invention passes through to introduce the second beam switch pulse, and
By constantly adjusting its relative intensity and the first relative delay for opening the light pulse so that light Kerr-gate is in first switch arteries and veins
The dwell period that impulse is encouraged can be subject to the effective control of the second beam switch pulse, so that it is guaranteed that the transmitance of light Kerr-gate is mainly received
First switch pulsing effect, and the shut-in time of light Kerr-gate is under the regulation and control of second switch pulse, greatly shortens, and then while
Realize the high permeability of femtosecond light Kerr-gate and ultrafast switch time.
Referring to Fig. 1, the method specifically includes following steps：
1) it is two beams by 3 points of first beam splitting chips of femtosecond pulse Jing of the polarization of the outgoing of femto-second laser 1, wherein a branch of
Used as the femtosecond direct impulse light of detection light path, another Shu Zuowei switchs the femtosecond switching pulse light of light path；
2) the second attenuators of femtosecond direct impulse light Jing 14 are decayed, after the second convex lenss 15 are focused on, sequentially through the polarizer
16th, light kerr medium 17 and analyzer 18, the wherein polarizer 16, light kerr medium 17 and analyzer 18 constitute femtosecond light Ke Er
Door.The parallel direction and vertical direction of the polarizer 16 and analyzer 18 to detection light polarization direction are adjusted respectively.
3) femtosecond switching pulse light is Jing after the first optical time delay line 4 adjusts its light path, then through 7 points of the second beam splitting chip be two
Beam, respectively as two beam switch pulsed lights.
4) the first beam switch light incides Guang Keer through the 3rd attenuator 22, the second half-wave plate 23 and the 4th convex lenss 24
On medium 17；Adjust the second half-wave plate 23 to make the first beam switch light polarization direction be and detect light polarization direction angle is 45 °, tune
Whole first optical time delay line 4 makes the first beam switch light light path identical with detection light.
5) the second beam switch light is through the first attenuator 8, the second optical time delay line 9, through the first half-wave plate 11 and first
Convex lenss 12 are incided on light kerr medium 17；Adjusting the first half-wave plate 11 makes the polarization direction and first of second switch pulsed light
Beam switch light polarization direction is vertical.Adjusting the second optical time delay line 9 makes the second beam switch light light path identical with detection light.Adjustment the
One attenuator 8 makes the second beam switch light intensity be not higher than the first beam switch light to correct position, and keeps appropriate ratio.
6) light Ke Er signals are received according to detector, the accurate stepping mobile platform controlled using computer controls the first light
The movement of delay line 4 and Real-time Collection light Ke Er signal datas are learned, the light Ke Er signature tunes two beam switch light are acted on simultaneously under are obtained
Line.
7) the second optical time delay line 9 is adjusted, makes second light Kerr-gate slightly lag behind first light Kerr-gate, be approximately at
Its dwell period.Repeat step 6), measure Ke Er signal curves.
8) with step 7) in the Ke Er intensity curves that measure as reference, re-start the second delay line 9 and first and decline
Subtract the regulation of piece 8.Through adjusting repeatedly, when two beam switch light relative time delaies and intensity rate are where appropriate, be obtained high transmission
Rate and the light Kerr-gate of ultrafast switch time.
Embodiment 1
The present embodiment is using Carbon bisulfide as light kerr medium.With Carbon bisulfide, carbon tetrachloride, benzene, NMP, quartz glass
For reference sample.And it is as follows with specific implementation step：
(1) it is 3mJ from the single pulse energy of femto-second laser outgoing, pulsewidth is 50fs, repetition rate 1kHz, horizontal direction
The femtosecond pulse of polarization, is 1 by splitting ratio:1 the first beam splitting chip is divided into two beams, and a branch of to detect light, another beam is to open
Guan Guang.
(2) the reflector alignment directions of propagation of light Jing the 5th are detected, the attenuators of Jing second adjust its intensity, the convex lenss of Jing second
Focus on, into the polarizer, light kerr medium Carbon bisulfide, analyzer, then detector is entered Jing after the 3rd convex lens focus.With biography
System light Kerr-gate is identical.
(3) light the first optical time delay of Jing line adjustment light path is switched, behind second, third reflector alignment direction, the is incided
On two beam splitting chips, it is divided into the first beam switch light and the second beam switch light.Its direction of reflector alignment of first beam switch light Jing the 6th
Afterwards, the attenuators of Jing the 3rd, the second half-wave plate, the 4th convex lenss enter light kerr medium；Second beam switch light the first attenuators of Jing
Adjust its light path by optical time delay line, then by the 4th its direction of propagation of reflector alignment, after through the first half-wave plate and first
Convex lenss enter light kerr medium.The polarization direction of the two beam switch light Jing after the adjustment of the second and first half-wave plate and detection light
Polarization direction is in+45 ° and -45 ° of angles.And two switch light light path Jing after the 4th and the 6th reflector alignment keep geometry pair
Claim.
(4) adjusting the second optical time delay line makes the second beam switch light slightly lag behind the first beam switch light, adjusts first and decays
Piece makes the second beam switch light intensity be not higher than the first beam switch light.And real time scan light Ke Er intensity curves, carry out accordingly
Optimization is adjusted repeatedly, finally gives the light Ke Er signals of high permeability and high time resolution.Its raw signal strength curve is such as
In Fig. 2 shown in red curve, after being normalized to data, as a result as shown in red curve in Fig. 3.
Further, in order to the imaging results obtained to this method are compared with traditional method, in the survey of above-mentioned steps (4)
After amount terminates, shading treatment is carried out to the second beam switch pulse, light kerr medium is replaced with into other several reference samples, measured
The light Ke Er intensity curves of traditional light Kerr-gate.As shown in Figures 2 and 3, it is the light Ke Er signal intensitys song of several samples
The comparison diagram of the measurement device result that line and its normalized curve are provided with the present invention.
As shown in Fig. 2 be the intensity curves that biswitch pulsed femtosecond light Kerr-gate provided by the present invention is measured, by
The time interval between two Kerr-gates in this measurement is shorter, thus peak signal strength is affected by certain, but
Relative to other benzene, NMP, carbon tetrachloride and quartz glass are more for the transmitance of biswitch light femtosecond light Kerr-gate in this measurement
Height, and if through further debugging, be expected to obtain higher transmitance.
As shown in figure 3, can be seen that the carbon light Kerr-gate of traditional curing from the normalized signal intensity curve for measuring
Halfwidth is about 900fs, and biswitch light femtosecond light Kerr-gate halfwidth provided by the present invention is about 300fs, temporal resolution
Have and be obviously improved.The halfwidth of this kind of solid dielectric of quartz glass is also in 300fs or so, but it is saturating to obtain its according to Fig. 2
Cross rate too low.Relative to benzene, carbon tetrachloride and NMP, the temporal resolution of biswitch light femtosecond light Kerr-gate is also higher.
Claims (10)
1. a kind of femtosecond light Kerr-gate of biswitch pulse, including femto-second laser (1), it is characterised in that：In femto-second laser
(1) transmitting light path is provided with the first beam splitting chip (3), and light path is divided into detection light path and switch light path by the first beam splitting chip (3), its
Be sequentially provided with middle detection light path the second attenuator (14), the second convex lenss (15), the polarizer (16), light kerr medium (17),
Analyzer (18), the 3rd convex lenss (19) and detector (20), make detection light by the light Kerr-gate gating of biswitch light；The polarizer
(16) polarization direction is identical with the polarization direction of the femtosecond direct impulse light in detection light path, the polarization direction of analyzer (18)
It is vertical with the polarization direction of femtosecond direct impulse light, switch light path on be sequentially provided with for adjust the light path of switching pulse first
Optical time delay line (4) and the second beam splitting chip (7) for switch light to be divided into two beams；First beam switch light is through the 3rd attenuator
(22), the second half-wave plate (23), are adjusted in 30 °～60 ° then convex through the 4th with detection light polarization direction by its polarization direction
Lens (24), reach light kerr medium (17)；Second beam switch light is through being used to adjust first attenuator (8) of light intensity, using
In the second optical time delay line (9) for adjusting the second beam switch pulse light path, through the first half-wave plate (11), its polarization direction is adjusted
Whole is vertical with first switching pulse polarization direction, then through the first convex lenss (12), reaches light kerr medium (17), and two
Shu Feimiao switching pulse light incides the internal locus of light kerr medium (17) and is situated between in Guang Keer with femtosecond direct impulse light
The internal locus of matter (17) overlap.
2. biswitch pulsed light femtosecond light Kerr-gate according to claim 1, it is characterised in that：Two separate beam switch arteries and veins
Existence time postpones between punching, adjusting range -1000fs～1000fs, and its relative delay passes through the second optical time delay line
(9) it is adjusted, the switching pulse intensity rate of two doors is adjusted by the first attenuator (8) and the 3rd attenuator (22).
3. biswitch pulsed light femtosecond light Kerr-gate according to claim 1, it is characterised in that：First switch pulse it is inclined
The direction that shakes is adjusted to and detects light polarization direction in 45 °, polarization direction and the first switch pulse polarization side of second switch pulse
To vertical.
4. biswitch pulsed light femtosecond light Kerr-gate according to claim 1 and 2, it is characterised in that：
Described femto-second laser (1) is the fs-laser system containing amplifier；
Described the first beam splitting chip (3) and the splitting ratio of the second beam splitting chip (7) is 1:(1～4)；
Described first, second, and third attenuator (8), (14), (22) they are neutral filter, including in fixed optical density (OD)
Property attenuator or variable neutral density attenuator；
Described the first half-wave plate (11) and the second half-wave plate (23) is zero-order half-wave piece, and its material is quartz material or BK glass
Glass.
5. biswitch pulsed light femtosecond light Kerr-gate according to claim 1, it is characterised in that：The first described optics prolongs
When line (4) and the accurate stepping mobile platform that controlled by computer of the second optical time delay line (9) and to be placed on accurate stepping movement flat
Two orthogonal reflecting mirrors on platform are constituted, and two orthogonal reflecting mirrors carry out backward anti-to femtosecond switching pulse light
Penetrate；Accurate stepping mobile platform is adjusted to the light path of femtosecond switching pulse light, and Adjustment precision is 1.5～15 microns, the
The minimum light path knots modification of one optical time delay line (4) and the second optical time delay line (9) is 10～100fs.
6. biswitch pulsed light femtosecond light Kerr-gate according to claim 1, it is characterised in that：The described polarizer (16)
It is that prism polarizers or extinction ratio are more than 10 with analyzer (18)4:1 thin film polarizer；Wherein prism polarizers include Nico
That prism polarizers, Glan-Taylor prism polariser or wollaston prism polariser.
7. according to the biswitch pulsed femtosecond light Kerr-gate described in claim 1, it is characterised in that：The light Ke Er for being used is situated between
Matter (17) is third order non-linear optical material.
8. the biswitch pulsed femtosecond light Kerr-gate according to claim 1 or 7, it is characterised in that：Described light Ke Er is situated between
Light kerr medium of the matter (17) including Carbon bisulfide, Nitrobenzol, carbon tetrachloride, benzene, NMP non-fully electronic response.
9. the implementation method of the femtosecond light Kerr-gate of a kind of biswitch pulse, it is characterised in that comprise the following steps：
1) beam splitting chips of the femtosecond pulse Jing first (3) of the polarization of femto-second laser (1) outgoing is divided into into two beams, wherein a branch of
As direct impulse light, another Shu Zuowei switching pulses light；
2) attenuators of direct impulse light Jing second (14) decay, the second convex lenss (15) focus on after, sequentially through the polarizer (16),
Light kerr medium (17) and analyzer (18), the wherein polarizer (16), light kerr medium (17) and analyzer (18) constitute femtosecond
Light Kerr-gate, adjusts respectively the polarizer (16) and analyzer (18) to the parallel direction and vertical direction for detecting light polarization direction；
3) switching pulse light is Jing after the first optical time delay line (4) adjusts its light path, then is divided into two beams through the second beam splitting chip (7) and opens
GUAN-pulse is washed off；
4) the first beam switch light incides light gram through the 3rd attenuator (22), the second half-wave plate (23) and the 4th convex lenss (24)
On your medium (17)；Adjust the second half-wave plate (23) make the first beam switch light polarization direction with detection light polarization direction in 30 °～
60 °, the first optical time delay line (4) of adjustment makes the first beam switch light light path identical with detection light；
5) the second beam switch light is through the first attenuator (8), the second optical time delay line (9), through the first half-wave plate (11) and
One convex lenss (12) are incided on light kerr medium (17)；Adjusting the first half-wave plate (11) makes the second beam switch pulse light polarization side
To vertical with first switch pulse light polarization direction, the second optical time delay line (9) of adjustment makes the second beam switch light light path with detection
Light is identical, and the first attenuator of adjustment (8) makes the second beam switch light intensity be not higher than the first beam switch light to correct position；
6) light Ke Er signals are received according to detector, the accurate stepping mobile platform controlled using computer is controlled the first optics and prolonged
When line (4) mobile and Real-time Collection light Ke Er signal datas, obtain the time resolution light gram two beam switch pulses are acted on simultaneously under
That signal curve；
7) the second optical time delay line (9) is adjusted, makes the time that the second beam switch pulse reaches light kerr medium slightly lag behind first
Beam switch pulse reaches the time of light kerr medium, repeat step 6), measure Ke Er signal curves；
8) with step 7) in the Ke Er intensity curves that measure as reference, re-start the second delay line (9) and the first decay
The regulation of piece (8), through adjusting repeatedly, is obtained the light Kerr-gate of high permeability and ultrafast switch time.
10. the implementation method of the femtosecond light Kerr-gate of a kind of biswitch pulse according to claim 1, it is characterised in that
The polarization direction of first switch pulse is in 45 ° with detection light polarization direction.
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| CN108828767A (en) * | 2018-07-23 | 2018-11-16 | 北京图湃影像科技有限公司 | A kind of automatic control optical time delay line apparatus |
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| CN114326254A (en) * | 2021-12-07 | 2022-04-12 | 西安交通大学 | Femtosecond double-switch optical Kerr gate based on optical birefringence effect and implementation method |
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