CN105841814B - A kind of Terahertz multiple-pulse transient state time-domain spectroscopy instrument - Google Patents
A kind of Terahertz multiple-pulse transient state time-domain spectroscopy instrument Download PDFInfo
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- CN105841814B CN105841814B CN201610319289.2A CN201610319289A CN105841814B CN 105841814 B CN105841814 B CN 105841814B CN 201610319289 A CN201610319289 A CN 201610319289A CN 105841814 B CN105841814 B CN 105841814B
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- 238000004611 spectroscopical analysis Methods 0.000 title claims abstract description 35
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- 238000001228 spectrum Methods 0.000 claims abstract description 25
- 238000012545 processing Methods 0.000 claims abstract description 13
- 230000005540 biological transmission Effects 0.000 claims description 32
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- 230000003287 optical effect Effects 0.000 claims description 14
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- 238000003384 imaging method Methods 0.000 claims description 4
- 238000005259 measurement Methods 0.000 abstract description 13
- 238000001514 detection method Methods 0.000 abstract description 7
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- 238000001328 terahertz time-domain spectroscopy Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
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Abstract
A kind of Terahertz multiple-pulse transient state time-domain spectroscopy instrument provided by the invention, the technical problem for the instantaneous measurement that continuous several times are carried out to terahertz detection pulse can not be realized for the time-domain spectroscopy instrument of prior art, the spectrometer of the present invention, femtosecond laser caused by femtosecond laser generation module is transmitted to light splitting Postponement module, produce the first femtosecond pulse sequence and the second femtosecond pulse sequence, first femtosecond pulse sequence produces inclined leading edge pulse train after the processing of inclined leading edge pulse train generation module, second femtosecond pulse sequence produces terahertz pulse sequence after the processing of terahertz pulse sequence generation module.Inclined leading edge pulse is transmitted to spectrum acquisition module in pulse modulation module after terahertz pulse sequence modulation, the shape information of the terahertz pulse sequence entrained by inclined leading edge pulse train after obtaining modulation as spectrum acquisition module, you can realize the measurement of Terahertz multiple-pulse transient state time-domain spectroscopy.
Description
Technical field
The present invention relates to laser system field, in particular to a kind of Terahertz multiple-pulse transient state time-domain spectroscopy instrument.
Background technology
In recent years, terahertz time-domain spectroscopic technology is quickly grown, ultrafast to material dynamic using terahertz time-domain spectroscopic technology
The research of mechanics achieves abundant achievement.Traditional terahertz time-domain spectroscopic technology is suitable for repeatable (reversible) material
The research of ultra-fast dynamics process, but the irreversible material ultra-fast dynamics behavior for single is with regard to helpless.Reason
It is that traditional terahertz time-domain spectroscopy system is mostly based on electrooptic effect and the time domain electric field signal of terahertz pulse is visited
Survey, in order to improve signal to noise ratio, can typically use lock-in amplifier, and the method being averaged using repeatedly measuring in the measurements, it is right
Reversible ultrafast process repeatedly measures point by point, to obtain the information of complete material ultra-fast dynamics process.
The method of terahertz pulse single measurement in recent years has certain development again, it is possible to achieve to single terahertz pulse
Carry out the single measurement of time-domain signal.But this method can only also realize the measurement to single terahertz pulse, can not realize
The single measurement of high speed is carried out to the terahertz pulse sequence comprising multiple Terahertz subpulses.It is irreversible (i.e. single in material
Secondary process) ultrafast dynamic process tera-hertz spectra research in, the instantaneous measurements of continuous several times is carried out to terahertz detection pulse
It is that current industry needs to solve the problems, such as.
The content of the invention
The present invention provides a kind of Terahertz multiple-pulse transient state time-domain spectroscopy instrument, it is intended to improves above mentioned problem.
A kind of Terahertz multiple-pulse transient state time-domain spectroscopy instrument provided by the invention, including femtosecond laser generation module, light splitting
Postponement module, inclined leading edge pulse train generation module, terahertz pulse sequence generation module, pulse modulation module and spectrum obtain
Modulus block.Femtosecond laser caused by the femtosecond laser generation module is transmitted to the light splitting Postponement module, via the light splitting
Postponement module produces the first femtosecond pulse sequence and the second femtosecond pulse sequence, and the first femtosecond pulse sequence is through the inclination
Inclined leading edge pulse train is produced after the pulse train generation module processing of forward position, the second femtosecond pulse sequence is through the terahertz
Terahertz pulse sequence is produced after hereby pulse train generation module processing.The inclined leading edge pulse train and the Terahertz arteries and veins
Rush sequence to transmit to the pulse modulation module, the inclined leading edge pulse is in the pulse modulation module by the terahertz
Transmitted after hereby pulse train modulation to the spectrum acquisition module, the inclination after modulation is obtained by the spectrum acquisition module
The shape information of terahertz pulse sequence entrained by the pulse of forward position.
Preferably, the light splitting Postponement module includes terminal light splitting piece and N level light-dividing devices, each light-dividing device bag
Light-splitting device and optical path adjusting device are included, wherein, N is the positive integer more than 1；
The light-splitting device of M level light-dividing devices in the N levels light-dividing device is used to that the incidence of the light-splitting device will to be inputted
Light is divided into the first emergent light of the first transmission direction and the second emergent light of the second transmission direction, and the optical path adjusting device is used for
Second emergent light of the second transmission direction is adjusted to the 3rd emergent light of the first transmission direction, wherein, M is positive integer, and M is more than
Equal to 1 and it is less than or equal to N, when M is equal to 1, the incident light of the M level light-dividing devices is the femtosecond laser, and M is more than or equal to 2
And when being less than or equal to N, the incident light of the M level light-dividing devices is the first emergent light of previous stage light-dividing device and the 3rd outgoing
Light；
The terminal light splitting piece is used for first emergent light of the M level light-dividing devices along first transmission direction and the
Three emergent lights are divided into the first femtosecond pulse sequence along the first transmission direction and described along second transmission direction
Two femtosecond pulse sequences.
Preferably, the light-splitting device is light splitting piece, and the optical path adjusting device is speculum.
Preferably, the inclined leading edge pulse train generation module includes the first grating, the first femtosecond pulse sequence
Incided with default incident angle on first grating, via forming the inclined leading edge pulse after first optical grating diffraction
Sequence.
Preferably, the inclined leading edge pulse train generation module also includes first polarizer and the second lens；
The inclined leading edge pulse train is transmitted to second lens, via institute after being filtered via first polarizer
Transmitted after stating the convergence of the second lens to the pulse modulation module.
Preferably, the terahertz pulse sequence generation module includes the first lens and nonlinear crystal；
The second femtosecond pulse sequence is transferred to the nonlinear crystal after being converged via first lens, described
Multiple Terahertz subpulses are produced on nonlinear crystal, multiple Terahertz subpulses form the terahertz pulse sequence.
Preferably, the terahertz pulse sequence generation module also includes the first parabolic mirror and the second parabola is anti-
Penetrate mirror.The terahertz pulse sequence via being collimated to second parabolic mirror after first parabolic mirror,
The pulse modulation module is incided after being converged via second parabolic mirror.
Preferably, the terahertz pulse sequence generation module also includes polyethylene sheets, and the polyethylene sheets are used for
By the terahertz pulse sequence caused by the nonlinear crystal be filtered processing after transmit it is anti-to first parabola
Penetrate mirror.
Preferably, the spectrum acquisition module includes the 3rd lens and imaging sensor, and the 3rd lens are used for will be through
The inclined leading edge pulse train after the pulse modulation module modulation converges to described image sensor, described image sensing
Device is used to obtain the shape information of the terahertz pulse series entrained by the inclined leading edge pulse train.
Preferably, the spectrum acquisition module also includes the second analyzer, and second analyzer is used for the terahertz
The polarized component of the inclined leading edge pulse train after hereby pulse train modulation is transmitted to the 3rd lens.
A kind of Terahertz multiple-pulse transient state time-domain spectroscopy instrument that the invention described above provides, for the time-domain spectroscopy of prior art
Instrument can not realize the technical problem for the instantaneous measurement that continuous several times are carried out to terahertz detection pulse, provided in an embodiment of the present invention
Terahertz multiple-pulse transient state time-domain spectroscopy instrument, femtosecond laser caused by femtosecond laser generation module are transmitted to the light splitting delay mould
Block, the first femtosecond pulse sequence and the second femtosecond pulse sequence, the first femtosecond arteries and veins are produced via the light splitting Postponement module
Rush sequence and produce inclined leading edge pulse train, the second femtosecond arteries and veins after inclined leading edge pulse train generation module processing
Rush sequence and produce terahertz pulse sequence after terahertz pulse sequence generation module processing.The inclined leading edge pulse sequence
Row and the terahertz pulse sequence are transmitted to the pulse modulation module, and the inclined leading edge pulse is in the impulse modulation
Transmitted after the terahertz pulse sequence modulation to the spectrum acquisition module in module, obtained by the spectrum acquisition module
The shape information of the terahertz pulse sequence entrained by the inclined leading edge pulse after modulation, you can realize Terahertz multiple-pulse
The measurement of transient state time-domain spectroscopy.
Brief description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below by embodiment it is required use it is attached
Figure is briefly described, it will be appreciated that the following drawings illustrate only certain embodiments of the present invention, therefore be not construed as pair
The restriction of scope, for those of ordinary skill in the art, on the premise of not paying creative work, can also be according to this
A little accompanying drawings obtain other related accompanying drawings.
Fig. 1 is the module frame chart for the Terahertz multiple-pulse transient state time-domain spectroscopy instrument that present pre-ferred embodiments provide；
Fig. 2 is the light splitting Postponement module for the Terahertz multiple-pulse transient state time-domain spectroscopy instrument that present pre-ferred embodiments provide
Structural representation；
Fig. 3 is the inclined leading edge pulse sequence for the Terahertz multiple-pulse transient state time-domain spectroscopy instrument that present pre-ferred embodiments provide
The structural representation of row generation module and terahertz pulse sequence generation module；
Fig. 4 is the spectrum acquisition module for the Terahertz multiple-pulse transient state time-domain spectroscopy instrument that present pre-ferred embodiments provide
Structural representation；
Fig. 5 is the inclined leading edge pulse sequence for the Terahertz multiple-pulse transient state time-domain spectroscopy instrument that present pre-ferred embodiments provide
The schematic diagram of row detection terahertz pulse sequence.
Reference collects：
Terahertz multiple-pulse transient state time-domain spectroscopy instrument 100；Femtosecond laser generation module 110；
It is divided Postponement module 120；First order light-dividing device 122；Second level light-dividing device 124；Terminal light splitting piece 126；Point
Optical device 123；Optical path adjusting device 125；
Inclined leading edge pulse train generation module 130；First grating 132；First polarizer 134；Second lens 136；
Terahertz pulse sequence generation module 140；First lens 142；Nonlinear crystal 144；Polyethylene sheets 146；The
One parabolic mirror 147；Second parabolic mirror 148；
Pulse modulation module 150；Spectrum acquisition module 160；
Second analyzer 162；3rd lens 164；Imaging sensor 166.
Embodiment
Those skilled in the art are seeking a kind of instrument or method for improving the problem always for a long time.
In consideration of it, the designer of the present invention is by long-term exploration and trial, and multiple experiment and effort, constantly
Reform and innovation, draw the Terahertz multiple-pulse transient state time-domain spectroscopy instrument shown in this programme.
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
Part of the embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.Therefore,
The detailed description of the embodiments of the invention to providing in the accompanying drawings is not intended to limit the model of claimed invention below
Enclose, but be merely representative of the selected embodiment of the present invention.Based on the embodiment in the present invention, those of ordinary skill in the art are not having
There is the every other embodiment made and obtained under the premise of creative work, belong to the scope of protection of the invention.
Refer to Fig. 1 to Fig. 5, a kind of Terahertz multiple-pulse transient state time-domain spectroscopy instrument 100 provided in an embodiment of the present invention.Figure
1 is a kind of module frame chart of Terahertz multiple-pulse transient state time-domain spectroscopy instrument provided in an embodiment of the present invention, is mainly swashed including femtosecond
Light generation module 110, light splitting Postponement module 120, inclined leading edge pulse train generation module 130, terahertz pulse sequence produce
Module 140, pulse modulation module 150 and spectrum acquisition module 160.The femtosecond laser generation module 110 prolongs with the light splitting
Slow module 120 connects, and the femto-second laser is used to produce femtosecond laser, and caused femtosecond laser is transmitted to light splitting and postpones mould
Block 120.The femtosecond Postponement module produces with the inclined leading edge pulse train generation module 130 and the terahertz pulse sequence
Raw module 140 is all connected with, and the light splitting Postponement module 120 is used to the femtosecond laser received being divided into two row femtosecond pulse sequences
Row, can include the first femtosecond pulse sequence and the second femtosecond pulse sequence.
First femtosecond pulse sequence is transmitted to the inclined leading edge pulse train generation module 130, before the inclination
Inclined leading edge pulse train is exported after being handled along pulse train generation module 130.Second femtosecond pulse sequence transmit to it is described too
Hertz pulse train generation module 140, exports terahertz pulse sequence after being handled by the terahertz pulse sequence generation module 140
Row.
The inclined leading edge pulse train generation module 130 and the terahertz pulse sequence generation module 140 are and institute
State pulse modulation module 150 to connect, the pulse modulation module 150 is connected with the spectrum acquisition module 160.Before the inclination
Along the pulse it is punched in the pulse modulation module 150 after the terahertz pulse sequence modulation, carries the terahertz pulse sequence
The shape information of row is transmitted to the spectrum acquisition module 160, by the waveform acquisition module to the inclined leading edge through ovennodulation
Pulse carries out shape information collection, obtains the spectrogram of the terahertz pulse sequence.
The femtosecond laser generation module 110, femto-second laser or other dresses that can produce femtosecond laser can be included
Put.Femtosecond is a kind of chronomere, the one of the P peta that 1 femtosecond only has 1 second point, i.e. 1e-15 seconds or 0.001 psec (1 psec
It it is the 1e-12 seconds).Femto-second laser is a kind of pulse laser.The pulse duration that femtosecond refers to.
Referring to the light splitting Postponement module 120 of Fig. 2, the present embodiment Terahertz multiple-pulse transient state time-domain spectroscopy instrument 100 provided
Structural representation.The light splitting Postponement module 120, including light-dividing device.In order to obtain two row femtosecond pulse sequences, described point
Light delay module 120 can preferably include terminal light splitting piece and N level light-dividing devices.Wherein, N is the positive integer more than 1.Set M
For positive integer, M is less than or equal to N more than or equal to 1 and M.The N level light-dividing devices of the light splitting Postponement module are successively set on a biography
Lose on road, the light-dividing device at first with the femtosecond laser Postponement module optical coupling is arranged to first order light-dividing device, edge
The laser delivery optics can include successively first order light-dividing device, second level light-dividing device,, M light-dividing devices.For
Reach preferable measurement effect, obtain multiple delay subpulses, and reduce the loss during laser transmission, the present embodiment
The N of the light-dividing device of shown light splitting Postponement module is equal to 2, that is, can include first order light-dividing device and second level light splitting
Device.
Each light-dividing device can include light-splitting device 123 and optical path adjusting device 125.The N levels light-dividing device
In M level light-dividing devices light-splitting device be used for by the incident light for inputting the light-splitting device be divided into along the first transmission direction transmit
The first emergent light and the second emergent light along the second transmission direction, the optical path adjusting device be used for the second transmission direction
Second emergent light is adjusted to the 3rd emergent light along the first transmission direction.
When M is equal to 1, the incident light of the M level light-dividing devices is the femtosecond laser.The incidence of first order light-dividing device
Light is femtosecond laser caused by the femtosecond laser generating device, and exporting first after being divided via the first order light-dividing device goes out
Penetrate light and the second emergent light.The transmission direction of the first emergent light is set as the first transmission direction, can be preferably first biography
Defeated direction is and the incident light identical transmission direction.The transmission direction of second emergent light is the second transmission direction, with
The transmission direction of first emergent light is different.The optical path adjusting device is used to the exit direction of the second emergent light being adjusted to
It is identical with the transmission direction of the first emergent light, that is, the second emergent light of the second transmission direction is adjusted to the first transmission direction
The 3rd emergent light.
M is more than or equal to 2 and when being less than or equal to N, and the incident lights of the M level light-dividing devices is the of previous stage light-dividing device
One emergent light and the 3rd emergent light, carry out follow-up light splitting operation.When M is equal to N, the first emergent light of N level light-dividing devices and
3rd emergent light incides terminal light splitting piece.The terminal light splitting piece is used to pass M level light-dividing devices along described first
First emergent light and the 3rd emergent light in defeated direction are divided into along the first femtosecond pulse sequence of the first transmission direction and along institute
State the second femtosecond pulse sequence of the second transmission direction.
In the light-dividing device, the light-splitting device 123 can be preferably light splitting piece, and the optical path adjusting device 125 can
Think speculum group, utilize angular multiplexed formation transmission space.The splitting ratio of the light splitting piece is preferably 1：1, it is ensured that point
The two-beam energy that mating plate separates is uniform, and spectral energy otherwise can be caused uneven, can cause the energy for producing Terahertz subpulse
It is inconsistent, also influence Effect on Detecting.
Include two light-dividing devices and a terminal light splitting piece continuing with referring to Fig. 2, the light splitting Postponement module 120, often
The individual light-dividing device can include a light splitting piece and three speculums.In first order light-dividing device 122, including first point
Mating plate, the first speculum, the second speculum and the 3rd speculum.First light splitting piece is from the horizontal by 45 degree of angles, and described
One speculum is placed in parallel with first light splitting piece in same perpendicular, second speculum and the described first reflection
Mirror is placed in parallel in same level, the 3rd speculum with second speculum is parallel in same perpendicular puts
Put, and the 3rd speculum is placed perpendicular to first light splitting piece.
The femtosecond laser transmits to the first light splitting piece of the first order light-dividing device 122 in the horizontal direction, is divided into
First subpulse and the second subpulse, first subpulse is vertically transmitted to the first speculum, via described first
Transmit to the second speculum after speculum reflection, then vertically passed after being reflected via second speculum in the horizontal direction
The 3rd speculum is transported to, is transmitted in the horizontal direction to the second level light-dividing device 124 after being reflected via the 3rd speculum.
Second subpulse transmits to second level light-dividing device 124 in the horizontal direction, and first subpulse is relative to described second
Subpulse has delay in time.Be into the first order light-dividing device 122 femtosecond laser via first fraction
Output two-beam road is parallel after electro-optical device 122 and has the subpulse of delay in time.
First subpulse transmits to the second light splitting piece BS2 of second level light-dividing device 124 in the horizontal direction, is divided into the 3rd
Subpulse and the 4th subpulse, the 3rd subpulse is vertically transmitted to the 4th speculum M4, anti-via the described 4th
Penetrate mirror M4 reflections to transmit in the horizontal direction to the 5th speculum M5, then transmitted after being reflected via the 5th speculum M5 to the 6th reflection
Mirror M6, transmitted in the horizontal direction to terminal light splitting piece 126 after being reflected via the 6th speculum M6.The 4th subpulse edge
Horizontal direction is transmitted to terminal light splitting piece 126, the 3rd subpulse has delay in time relative to the 4th subpulse.
It is the first subpulse into the second level light-dividing device 124 via exporting two beams after the second level light-dividing device 124
Light path is parallel and has the subpulse of delay in time.It can similarly obtain, second subpulse is divided via the second level and filled
The 5th subpulse is exported after putting 124 and the 6th subpulse, the 5th subpulse and the 6th subpulse are parallel to each other, and
There is delay on time.Because first subpulse and second subpulse have delay in time, then correspondingly, described
Three subpulses, the 4th subpulse, the 5th subpulse and the 6th subpulse have delay in time.
Foregoing light-dividing device is obtained into optic path direction to be parallel to each other and there are multiple subpulses of delay in time,
Transmit to terminal light splitting piece 126.3rd subpulse, the 4th subpulse, the 5th subpulse and the 6th subpulse are transmitted to institute
After stating the 3rd light splitting piece, the 3rd subpulse exports the 3rd transmitted in the horizontal direction after being divided via the 3rd light splitting piece
Horizontal laser and the 3rd longitudinal laser vertically transmitted, similarly, the 4th subpulse, the 5th subpulse are via described
The 4th horizontal laser in the horizontal direction, the 5th horizontal laser, the 6th horizontal laser and along vertical side are exported after 3rd light splitting piece
To the 4th longitudinal laser, the 5th longitudinal laser and the 6th longitudinal laser of transmission, that is, generate orthogonal two row femtosecond and swash
Light, the first femtosecond pulse sequence in the horizontal direction and the second femtosecond pulse sequence vertically transmitted.
Two beam femtosecond pulse sequences caused by the light splitting Postponement module 120, the first femtosecond pulse sequence are transmitted to inclination
Forward position pulse train generation module 130 is used to form inclined leading edge pulse train, and the second femtosecond pulse sequence is transmitted to too
Hertz pulse train generation module 140 is used to form terahertz pulse sequence.
Refer to Fig. 3, the inclined leading edge arteries and veins of terahertz pulse sequence transient state time-domain spectroscopy instrument provided in an embodiment of the present invention
Rush the structural representation of sequence generation module 130 and terahertz pulse sequence generation module 140.
The inclined leading edge pulse train generation module 130 can include the first grating 132 and the 7th speculum, described point
The first femtosecond pulse sequence that light delay module 120 exports is incided on the 7th speculum, is reflected via the 7th speculum
Afterwards, after being transmitted to predetermined angle on first grating 132, its first-order diffraction light is produced with the detection for tilting pulse front edge
Pulse train, that is, form the inclined leading edge pulse train.
The inclined leading edge pulse train generation module 130 can also include first polarizer 134 and the second lens 136,
The inclined leading edge pulse train is transmitted to second lens 136, via described after being filtered via first polarizer 134
The pulse modulation module is transferred to after focusing.
The terahertz pulse sequence generation module 140, the first lens 142 and nonlinear crystal 144 can be included.It is described
Second femtosecond pulse sequence caused by light splitting Postponement module 120 incides described non-thread after being converged via first lens 142
Property crystal 144 on, because nonlinear optics effect produces multiple terahertz pulses, that is, form terahertz pulse sequence.
The terahertz pulse sequence generation module 140 can also include the first parabolic mirror 147, the second parabola
Speculum 148 and polyethylene sheets 146.The terahertz pulse sequence formed on the nonlinear crystal 144, via described poly-
Vinyl foils 146 are filtered processing, are only to allow terahertz pulse to pass through, and stop femtosecond pulse light and pass through.It is filtered
Terahertz pulse sequence after ripple processing after first parabolic mirror 147 via being collimated to the second parabolic mirror
On 148, incided after being converged via second parabolic mirror 148 in the pulse modulation module.
On the basis of above-described embodiment, indium tin oxide films, as ITO can also be included.For transmiting femtosecond laser,
Reflected terahertz hereby ripple.The inclined leading edge pulse train and the terahertz pulse sequence after the ITO via being transferred to arteries and veins
Modulated module 150 is modulated, and the pulse modulation module 150 can be preferably electrooptic effect crystal.With inclination pulse
The inclined leading edge pulse train in forward position detects as detection light for terahertz pulse sequence.Due to terahertz pulse sequence
The electrooptic effect being listed in electrooptic effect crystal, the polarization state of inclined leading edge pulse train can be caused to change, its polarization state
Knots modification it is directly proportional to the electric-field intensity of terahertz pulse sequence.Due to the inclined leading edge pulse train as direct impulse
Pulse front edge be in the X direction it is inclined, therefore the direct impulse of different x positions perpendicular to the first polarizer 134P1 directions
On polarization intensity be just proportional to the electric-field intensity of terahertz pulse at different moments.After the terahertz pulse sequence modulation
Inclined leading edge pulse carry the relevant parameter information of the terahertz pulse sequence, transmit to the spectrum acquisition module 160,
To obtain the shape information of terahertz pulse sequence.
Fig. 5 is referred to, the spectrum of Terahertz multiple-pulse transient state time-domain spectroscopy instrument 100 provided in an embodiment of the present invention obtains mould
Block 160, the spectrum acquisition module 160 can include the second analyzer 162, the 3rd lens 164 and imaging sensor 166, institute
The second analyzer 162 to be stated to couple with the electrooptic effect crystal, second analyzer 162 couples with the 3rd lens 164,
3rd lens 164 couple with described image sensor 166.
Transmitted via the inclined leading edge pulse train after the terahertz pulse sequence modulation to the second analyzer 162, by
Second analyzer 162 is filtered out in the inclined leading edge pulse train not by the polarization of terahertz pulse sequence modulation point
Amount, only allow via the polarized component after the terahertz pulse sequence modulation by transmitting to the 3rd lens 164, via institute
State the 3rd lens 164 and converge to described image sensor 166, each direct impulse is obtained by described image sensor 166
Light distribution, and then obtain the shape information of the terahertz pulse sequence entrained by the inclined leading edge pulse train.In x
On direction, the pulse front edge of inclined leading edge pulsed light is that inclined therefore different x position just represents the different time.Quilt
The intensity proportional for the pulsed light that first analyzer filters out is in terahertz pulse electric-field intensity, along the light intensity on x directions point
Cloth is directly proportional to the electric field information of terahertz pulse, therefore light intensity is added up along y directions, it is possible to obtains Terahertz
The shape information of pulse.
The terahertz pulse transient state time-domain spectroscopy instrument that the embodiments of the present invention provide, for the time-domain spectroscopy of prior art
Instrument can not realize the technical problem for the instantaneous measurement that continuous several times are carried out to terahertz detection pulse, provided in an embodiment of the present invention
Terahertz multiple-pulse transient state time-domain spectroscopy instrument 100, femtosecond laser caused by femtosecond laser generation module 110, which is transmitted to light splitting, to postpone
Module 120, the first femtosecond pulse sequence and the second femtosecond pulse sequence are produced via the light splitting Postponement module 120, first flies
Pulse per second (PPS) sequence produces inclined leading edge pulse train after being handled via generation after the inclined leading edge pulse train resume module, the
Two femtosecond pulse sequences produce terahertz pulse sequence after the processing of terahertz pulse sequence generation module 140.It is caused described
Inclined leading edge pulse train and the terahertz pulse sequence are transmitted to pulse modulation module 150, the pulse modulation module 150
It can be electrooptic effect crystal.Due to electrooptic effect of the terahertz pulse sequence in electrooptic effect crystal, as direct impulse
Inclined leading edge pulse changed by terahertz pulse sequence modulation, its polarization state in the pulse modulation module 150, it is polarized
The change beam of state is directly proportional to the electric field of terahertz pulse.Inclined leading edge pulse after modulated is transmitted to spectrum acquisition module
160, the waveform letter of the terahertz pulse sequence entrained by inclined leading edge pulse after obtaining modulation as spectrum acquisition module 160
Breath, you can realize the measurement of Terahertz multiple-pulse transient state time-domain spectroscopy.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (7)
1. a kind of Terahertz multiple-pulse transient state time-domain spectroscopy instrument, it is characterised in that including femtosecond laser generation module, light splitting delay
Module, inclined leading edge pulse train generation module, terahertz pulse sequence generation module, pulse modulation module and spectrum obtain mould
Block；
Femtosecond laser caused by the femtosecond laser generation module is transmitted to the light splitting Postponement module, is postponed via the light splitting
Module produces the first femtosecond pulse sequence and the second femtosecond pulse sequence, and the first femtosecond pulse sequence is through the inclined leading edge
Inclined leading edge pulse train is produced after the processing of pulse train generation module, the second femtosecond pulse sequence is through the Terahertz arteries and veins
Terahertz pulse sequence is produced after rushing the processing of sequence generation module；
The inclined leading edge pulse train and the terahertz pulse sequence are transmitted to the pulse modulation module, the inclination
Forward position pulse train is transmitted to the spectrum after the terahertz pulse sequence modulation in the pulse modulation module and obtained
Module, the terahertz pulse sequence entrained by the inclined leading edge pulse train after obtaining modulation as the spectrum acquisition module
Shape information,
The light splitting Postponement module includes terminal light splitting piece and N level light-dividing devices, and each light-dividing device includes light-splitting device
With optical path adjusting device, wherein, N is positive integer more than 1；
The light-splitting device of M level light-dividing devices in the N levels light-dividing device is used to that the incident light point of the light-splitting device will to be inputted
Into the first emergent light of the first transmission direction and the second emergent light of the second transmission direction, the optical path adjusting device is used for the
Second emergent light of two transmission directions is adjusted to the 3rd emergent light of the first transmission direction, wherein, M is positive integer, and M is more than or equal to
1 and it is less than or equal to N, when M is equal to 1, the incident light of the M level light-dividing devices be the femtosecond laser, and M is more than or equal to 2 and small
When equal to N, the incident light of the M level light-dividing devices is the first emergent light and the 3rd emergent light of previous stage light-dividing device；
The terminal light splitting piece is used to the first emergent light and the 3rd along first transmission direction of M level light-dividing devices
Penetrate light and be divided into the first femtosecond pulse sequence along the first transmission direction and described second along second transmission direction and fly
Pulse per second (PPS) sequence；
Wherein, the inclined leading edge pulse train generation module includes the first grating, and the first femtosecond pulse sequence is with default
Incident angle is projected on first grating, via forming the inclined leading edge pulse train after first optical grating diffraction.
2. Terahertz multiple-pulse transient state time-domain spectroscopy instrument according to claim 1, it is characterised in that the inclined leading edge arteries and veins
Rushing sequence generation module also includes first polarizer and the second lens；
The inclined leading edge pulse train is transmitted to second lens after being filtered via first polarizer, via described the
Transmitted after the convergence of two lens to the pulse modulation module.
3. Terahertz multiple-pulse transient state time-domain spectroscopy instrument according to claim 1, it is characterised in that the terahertz pulse
Sequence generation module includes the first lens and nonlinear crystal；
The second femtosecond pulse sequence is transferred to the nonlinear crystal after being converged via first lens, described non-thread
Multiple Terahertz subpulses are produced on property crystal, multiple Terahertz subpulses form the terahertz pulse sequence.
4. Terahertz multiple-pulse transient state time-domain spectroscopy instrument according to claim 3, it is characterised in that the terahertz pulse
Sequence generation module also includes the first parabolic mirror and the second parabolic mirror；
The terahertz pulse sequence passes through via second parabolic mirror is collimated to after first parabolic mirror
The pulse modulation module is projected after being converged by second parabolic mirror.
5. Terahertz multiple-pulse transient state time-domain spectroscopy instrument according to claim 4, it is characterised in that the terahertz pulse
Sequence generation module also includes polyethylene sheets, and the polyethylene sheets are used for the terahertz caused by the nonlinear crystal
Hereby pulse train is transmitted to first parabolic mirror after being filtered processing.
6. Terahertz multiple-pulse transient state time-domain spectroscopy instrument according to claim 1, it is characterised in that the spectrum obtains mould
Block includes the 3rd lens and imaging sensor, and the 3rd lens are used to incline described in after pulse modulation module modulation
Skew front pulse train converges to described image sensor, and described image sensor is used to obtain the inclined leading edge pulse train
The shape information of entrained terahertz pulse series.
7. Terahertz multiple-pulse transient state time-domain spectroscopy instrument according to claim 6, it is characterised in that the spectrum obtains mould
Block also includes the second analyzer, and second analyzer is used for the inclined leading edge after the terahertz pulse sequence modulation
The polarized component of pulse train is transmitted to the 3rd lens.
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