CN105866061A - A differential pulse detecting apparatus for terahertz wave time domain information and a differential pulse detecting method - Google Patents
A differential pulse detecting apparatus for terahertz wave time domain information and a differential pulse detecting method Download PDFInfo
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- 238000001514 detection method Methods 0.000 claims description 54
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- 239000000919 ceramic Substances 0.000 claims description 7
- 238000006073 displacement reaction Methods 0.000 claims description 5
- 238000011144 upstream manufacturing Methods 0.000 claims description 5
- 238000013461 design Methods 0.000 abstract description 6
- 238000001328 terahertz time-domain spectroscopy Methods 0.000 abstract description 3
- 239000013078 crystal Substances 0.000 description 9
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 8
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- 238000005070 sampling Methods 0.000 description 7
- 210000001367 artery Anatomy 0.000 description 6
- 210000003462 vein Anatomy 0.000 description 6
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 5
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- 239000000463 material Substances 0.000 description 5
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- 229910052573 porcelain Inorganic materials 0.000 description 1
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- 239000007787 solid Substances 0.000 description 1
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- XSOKHXFFCGXDJZ-UHFFFAOYSA-N telluride(2-) Chemical compound [Te-2] XSOKHXFFCGXDJZ-UHFFFAOYSA-N 0.000 description 1
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- G01N21/3581—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using far infrared light; using Terahertz radiation
- G01N21/3586—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using far infrared light; using Terahertz radiation by Terahertz time domain spectroscopy [THz-TDS]
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Abstract
A differential pulse detecting apparatus for terahertz wave time domain information and a differential pulse detecting method are provided. The apparatus includes a femtosecond laser generating unit with a certain repetition frequency, a beam splitting unit, a terahertz pulse generating unit, a unit containing a sample to be detected, a terahertz pulse collecting unit, a detecting laser pulse focusing unit, a detecting unit, a spatial light modulation unit and a terahertz pulse reduction unit. As the spatial light modulation unit can regulate the spatial optical path difference between a terahertz pulse and a detecting laser pulse, the difference between the terahertz pulse and the detecting laser pulse simultaneously reaching the detecting unit is an integral multiple of an adjacent pulse interval, and therefore the method can regulate the optical path difference in real time according to the size of a detected object under a condition that a whole optical path system is determined, a design of the overall system is not limited to the size of the detected object, and limitation of traditional terahertz time-domain spectroscopy systems on the size of the detected object is got rid of.
Description
Technical field
The invention belongs to terahertz time-domain scanning field, be specifically related to a kind of THz wave time domain letter
The anticoincidence pulse detection device of breath and anticoincidence pulse detection method.
Background technology
THz wave is referred to as " not damaged spy owing to it has relatively weak photon energy
Survey " optical region.Owing to turn and the vibration level (i.e. Fingerprint) of biomolecule are big
Be in terahertz wave band more, it is possible to use this wave band photon biomolecular structure is analyzed and
Manipulation.Therefore, THz wave has in terms of biomedical imaging, material composition detection and qualification
There is significant application value.But totally seeing, THz wave research in these areas is still in experiment
In the room stage, large-scale application is also faced with lot of challenges.Power such as existing terahertz emission source
Relatively low, the THz wave penetrance to examining object will be limited；Surrounding is to terahertz emission
Interference, such as the absorption of steam；THz wave becomes spectrum image taking speed to have much room for improvement.And wherein,
Restriction Terahertz system really march toward miniaturization, to move towards a practical key factor be terahertz
Hereby time domain scan mode.
For Mu Qian, the linear of mechanical translation platform is mainly passed through in obtaining of THz wave time-domain information
Scanning.This method requires that the pulse laser by LASER Light Source exports is divided into two bundles, the most a branch of
Irradiate quasiconductor antenna as pump light, produce terahertz emission；Another bundle of pulsed laser conduct
Detection light is irradiated to quasiconductor antenna, by regulation pump light and detection light the spatial light of process
Journey, makes the terahertz pulse of generation arrive exploring antenna, then profit with the pulse of detection light simultaneously
Detecting optical pulses is completed to THz wave time-domain information with the linear scanning of mechanical platform translation
Sampling, thus restore the time-domain information of THz wave.This method can be in longer distance
The accurate time-domain information of interior realization scans, but requires the optical path difference between pump light and detection light
Must be equal, just can complete the scanning of time-domain information, therefore light path design is very big with build process
The requirement being limited to optical path difference；Meanwhile, the requirement of optical path difference is limited and is visited by whole system
Survey the volume of object, therefore, significantly limit its large-scale application.
Summary of the invention
The present invention is carried out for solving the problems referred to above, at the most conventional time domain scan mode
Improve on basis, it is provided that the anticoincidence pulse detection device of a kind of THz wave time-domain information
And use this device to carry out the anticoincidence pulse detection method of THz wave time-domain information.The present invention adopts
By following technical scheme:
The invention provides the anticoincidence pulse detection device of a kind of THz wave time-domain information, have:
Having the femtosecond laser generating unit of certain repetition rate, the femtosecond that output repetition rate is stable swashs
Light；Beam splitting portion, is arranged in the light path of the locked femtosecond laser of repetition rate, for flying
Second laser is divided into orthogonal detection laser pulse and exploring laser light pulse；Terahertz pulse shape
One-tenth portion, is arranged on the upstream of detection laser pulse light path, is used for producing terahertz emission, is formed
THz wave；Measuring samples receiving portion, is arranged on the downstream of detection laser pulse light path, is used for
Accommodate measuring samples；Terahertz pulse collection portion, at measuring samples and is treated sample for air exercise
The described terahertz pulse that product are reflected back is collected；Exploring laser light pulse concentration portion, is arranged on
The upstream of exploring laser light pulse light path, for being focused exploring laser light pulse；Probe portion,
Detect terahertz pulse and the information of exploring laser light pulse closing bundle at this simultaneously；Space light path
Modulation portion, regulation terahertz pulse and exploring laser light pulse the space light path of process, make terahertz
Hereby pulse and arrive the exploring laser light pulse of probe portion simultaneously and differ the integer at adjacent pulse interval
Times；And terahertz pulse reduction portion, use exploring laser light pulse to concurrently arriving detection
The time-domain information of the terahertz pulse in portion is sampled scanning, and believes the time domain of terahertz pulse
Breath reduces.
Further, the femtosecond laser generating unit with certain repetition rate includes: femtosecond laser
Device, exports the femtosecond laser of certain repetition rate, and its resonator cavity end is fixedly installed piezoelectricity pottery
Porcelain, after pump light enters resonator cavity, forms beat signal；Photodetector, is arranged on
In the light path of femtosecond laser, capture is through the femtosecond laser of reflecting mirror, and uses tunable deflection
Signal is mixed as reference, the repetition rate detecting the femto-second laser obtained with it, produces
A raw error signal representing laser instrument repetition rate and standard frequency difference；Low pass filter,
High-frequency signal in error signal is filtered, obtains low frequency head error signal；Preamplifier,
Low frequency head error signal is amplified；Loop control unit, after exaggerated error signal enters
Output compensating control signal；And modulation booster amplifier, drive described piezoelectric ceramics to produce position
Shifting amount and to change chamber long, allow repetition rate dynamic tracking compensating control signal, it is achieved repetition rate
Locking.
Further, the anticoincidence pulse that present invention also offers a kind of THz wave time-domain information is visited
Survey method, comprises the following steps:
Step 1, uses femto-second laser to export the femtosecond laser of certain repetition rate, and femtosecond swashs
After light enters the resonator cavity being provided with piezoelectric ceramics, form beat signal；
Step 2, uses photodetector capture to pass through the femtosecond laser of reflecting mirror, and by adjustable
Humorous defection signal mixes as reference, the repetition rate detecting the femto-second laser obtained with it
Frequently, an error signal representing laser instrument repetition rate and standard frequency difference is produced；
Step 3, uses low pass filter to filter the high-frequency signal in error signal,
To low frequency head error signal；
Step 4, uses preamplifier to be amplified low frequency head error signal；
Step 5, uses loop control unit output after exaggerated described error signal enters to mend
Repay control signal；
Step 6, uses modulation booster amplifier, and driving pressure electroceramics produces displacement and changes
Chamber is long, allows repetition rate dynamic tracking compensating control signal, it is achieved the locking of repetition rate；
Step 7, uses beam splitting portion to be divided into orthogonal by the femtosecond laser that repetition rate locks
Detection laser pulse and exploring laser light pulse；
Step 8, uses terahertz pulse forming portion to produce terahertz emission, forms THz wave；
Step 9, uses terahertz pulse collection portion air exercise at measuring samples anti-by measuring samples
The terahertz pulse being emitted back towards converges；
Step 10, uses exploring laser light pulse concentration portion to the described exploring laser light through lens
Pulse is focused；
Step 11, uses probe portion to detect terahertz pulse and described exploring laser light arteries and veins simultaneously
The information of punching；
Step 12, uses space light path modulation portion to regulate described terahertz pulse and exploring laser light
Pulse the spatial light path difference of process, make terahertz pulse and the detection simultaneously arriving probe portion swash
The integral multiple at light pulse difference adjacent pulse interval；
Step 13, uses terahertz pulse reduction portion, uses exploring laser light pulse to same therewith
Time arrive the time-domain information of terahertz pulse of probe portion and be sampled scanning, and to Terahertz arteries and veins
The time-domain information of punching reduces.
It addition, it is the n-th-m that terahertz-wave pulse arrives the target pulse of described probe portion, institute
The target pulse stating the exploring laser light pulse described probe portion of arrival is the n-th-w, these two pulses
Arrive the condition that the optical path difference of described probe portion should meet is simultaneously:
Δ=(| (n-m)-(n-w) |) c*k/f
Wherein, n is integer, represents first pulse behind beam splitting portion；C is laser
Spread speed, i.e. the light velocity；K is the refractive index of medium；F is the repetition frequency of femto-second laser
Rate；N-m represents and arrives the pulse of probe portion in Terahertz light path is the m behind beam splitting portion
Individual pulse；N-w represents and arrives the pulse of probe portion in reference laser pulse light path is through beam splitting
The w pulse behind portion；.
Invention effect and effect
Anticoincidence pulse detection device and too according to the THz wave time-domain information that the present invention provides
The anticoincidence pulse detection method of Hertz wave time-domain information, owing to space light path modulation portion can regulate too
Hertz pulse and exploring laser light pulse the spatial light path difference of process so that terahertz pulse with
Time arrive the integral multiple at exploring laser light pulse difference adjacent pulse interval of probe portion, thus the party
Method can adjust light according to testee size in the case of whole light path system determines in real time
Path difference so that the design of whole system is no longer limited by testee size, has broken away from tradition too
The hertz time-domain spectroscopy system restriction to testee volume；Simultaneously as different arteries and veins can be utilized
Rushing in row detection, the design of whole optical system tends to miniaturization, practical；More important
, the method has broken time-domain spectroscopy system can only carry out the limit of closely elemental analysis
System, all can realize the time-domain information scanning of THz wave near field, far field material, thus will too
Hertz time domain spectroscopy is extended to remote component analysis and material detection.
Accompanying drawing explanation
Fig. 1 is the structural representation of the anticoincidence pulse detection device of the THz wave time-domain information of the present invention；
Fig. 2 is the structural representation of the femtosecond laser generating unit with certain repetition rate of the present invention；
Fig. 3 is the schematic diagram that the spatial modulation portion of the present invention carries out spatial modulation；
Fig. 4 is that the anticoincidence pulse detection method of the THz wave time-domain information of the present invention is for electro-optic crystal
The structural representation of sampling detection terahertz pulse signal.
Detailed description of the invention
The detailed description of the invention of the present invention is described below in conjunction with accompanying drawing.
Fig. 1 is the structure of the anticoincidence pulse detection device of the THz wave time-domain information of the present embodiment
Schematic diagram.
As it is shown in figure 1, the anticoincidence pulse detection device 100 of THz wave time-domain information includes having
Certain the femtosecond laser generating unit 11 of repetition rate, beam splitting portion 12, convex lens 13, quasiconductor
Antenna 14, paraboloidal mirror 15, high resistant silicon chip 16, measuring samples receiving portion 17, Terahertz arteries and veins
Rush in collection portion 18, probe portion 19, exploring laser light pulse concentration portion 20 and figure and do not demonstrate
Space light path modulation portion and terahertz pulse reduction portion.Wherein, convex lens 13, partly lead
Body antenna 14, paraboloidal mirror 15, high resistant silicon chip 16 constitute terahertz pulse forming portion.
Fig. 2 is the knot of the femtosecond laser generating unit with certain repetition rate in the present embodiment
Structure schematic diagram.
As in figure 2 it is shown, the femtosecond laser generating unit 11 with certain repetition rate includes femtosecond
Laser instrument 111, photodetector 112, low pass filter 113, preamplifier 114, ring
Road controller 115 and modulation booster amplifier 116.
Femto-second laser 111 produces the femtosecond laser of certain repetition rate, and its resonator cavity end is solid
Surely it is provided with piezoelectric ceramics (PZT), after pump light enters resonator cavity, forms beat frequency letter
Number, frequency is the integral multiple of beat signal；Photodetector 112 is arranged on described femtosecond laser
Light path on, its capture very small amount is through the femtosecond laser of reflecting mirror, and uses tunable deflection
Signal is mixed as reference, the repetition rate detecting the femto-second laser obtained with it, produces
A raw error signal representing laser instrument repetition rate and standard frequency difference；Low pass filter
113 high-frequency signals in the error signal producing photodetector filter, and obtain
Low frequency head error signal；Preamplifier 114 is for being amplified this low frequency head error signal；Ring
Road controller 115 output after entering in this described error signal being exaggerated compensates and controls
Signal；Modulation booster amplifier 116 produces displacement for driving pressure electroceramics and changes chamber
Long, thus allow repetition rate dynamic tracking compensating control signal, it is achieved the locking of repetition rate.
As it is shown in figure 1, beam splitting portion 12 is arranged on the light of the locked femtosecond laser of repetition rate
Lu Shang, for being divided into orthogonal detection laser pulse and exploring laser light arteries and veins by femtosecond laser
Punching.In the present embodiment, beam splitting portion is 780nm beam splitting chip.
Terahertz pulse forming portion by convex lens 13, quasiconductor antenna 14, paraboloidal mirror 15,
High resistant silicon chip 16 forms.Detection laser pulse is focused by convex lens 13, quasiconductor antenna
14 be focused after detection laser pulse irradiate after, produce terahertz emission, formed Terahertz
Ripple, paraboloidal mirror 15 is for being collected THz wave and converging, and high resistant silicon chip 16 is to too
Hertz wave filters so that the THz wave of required frequency passes through.In the present embodiment, throw
Object plane mirror 15 is gold-plated off axis paraboloidal mirror.
Measuring samples receiving portion 17 and high resistant silicon chip close on, and are used for accommodating measuring samples.Terahertz
Hereby pulse converges collects 18 for air exercise at measuring samples the Terahertz that is reflected back by measuring samples
Pulse is collected.In the present embodiment, terahertz pulse convergence portion 18 is gold-plated off-axis parabolic
Face mirror.
Exploring laser light pulse concentration portion 20 is arranged on the upstream of exploring laser light pulse light path, is used for
Exploring laser light pulse is converged.In the present embodiment, exploring laser light pulse concentration portion 20
For convex lens.
Probe portion is for entering the terahertz pulse arrived and exploring laser light pulse simultaneously simultaneously
Row detection；Space light path modulation portion is used for regulating terahertz pulse and is passed through with exploring laser light pulse
Space light path, make terahertz pulse with the exploring laser light pulse arriving probe portion simultaneously and differ phase
The integral multiple in adjacent pulse spacing；Terahertz pulse reduction portion, uses exploring laser light pulse to therewith
The time-domain information of the terahertz pulse simultaneously arriving probe portion is sampled scanning, and to Terahertz
The time-domain information of pulse reduces, and obtains the composition information of measuring samples.
Fig. 3 is the schematic diagram that the spatial modulation portion in the present embodiment carries out spatial modulation.
As shown in figures 1 and 3, it is assumed that the pulse arriving probe portion in Terahertz light path is
N-5, the pulse arriving probe portion in reference laser pulse light path is the n-th-8, these two
Pulse arrives the condition that the optical path difference of probe portion should meet simultaneously:
Δ=(| (n-5)-(n-8) |) c*k/f=3c*k/f
Wherein, n is integer, represents first pulse behind beam splitting portion；N-5 represents too
The pulse arriving probe portion in hertz light path is the 5th pulse behind beam splitting portion；N-8 generation
The pulse arriving probe portion in table reference laser pulse light path is the 8th behind beam splitting portion
Pulse；C is the spread speed of laser, i.e. the light velocity；K is the refractive index of medium；F is femtosecond
The repetition rate of laser instrument.
Spatial modulation portion only need to carry out the modulation of optical path difference according to above-mentioned formula can realize two
Different pulses reaches object simultaneously.At this point it is possible to utilize (n-8) individual exploring laser light
Pulse completes the time-domain signal sampling scanning of (n-5) individual terahertz pulse, thus restores
Terahertz pulse.
In traditional control method, due to traditional terahertz time-domain detection mode LASER Light Source
Repetition rate does not locks, it is necessary to it is also n-th-5 that control detection light path arrives the pulse of target simultaneously
Individual could conjunction at impact point is restrainted, and then utilizes the linear scanning of mechanical translation platform to complete to detect light arteries and veins
The punching sampling to THz wave time-domain information, thus restore the time-domain information of THz wave.
Fig. 4 is that the anticoincidence pulse detection method of the THz wave time-domain information of the present embodiment is for electricity
The structural representation of luminescent crystal sampling detection terahertz pulse signal.
With object lesson, the anticoincidence pulse detection method of THz wave time-domain information is carried out in detail below
Describe in detail bright.
As shown in Figure 4, the light path of electro-optic crystal sampling detection terahertz pulse signal includes repeating
The femto-second laser 11 of frequency accurate lock, beam splitting portion 12, convex lens 13, quasiconductor antenna
14, paraboloidal mirror 15, high resistant silicon chip 16, measuring samples receiving portion 17, terahertz pulse are received
Collection portion 18, exploring laser light pulse concentration portion 20, electro-optic crystal zinc telluridse (ZnTe) 21,1/4
Wave plate 22；PBS polarization splitting prism 23, photoelectric probe PD24.
As shown in Figure 2 and Figure 4, the anticoincidence pulse detection method pair of THz wave time-domain information is used
The method of electro-optic crystal sampling detection terahertz pulse signal comprises the steps:
Step 1, femto-second laser 111 exports the femtosecond laser of certain repetition rate, this femtosecond
After laser enters resonator cavity as pump light, form beat signal；
Step 2, photodetector 112 capture passes through the femtosecond laser of reflecting mirror, and by adjustable
Humorous defection signal mixes as reference, the repetition rate detecting the femto-second laser obtained with it
Frequently, an error signal representing laser instrument repetition rate and standard frequency difference is produced；
Step 3, the high-frequency signal in error signal is filtered by low pass filter 113,
To low frequency head error signal；
Step 4, low frequency head error signal is amplified by preamplifier 114；
Step 5, loop control unit 115 output after exaggerated described error signal enters is mended
Repay control signal；
Step 6, modulation booster amplifier 116 driving pressure electroceramics produces displacement and changes chamber
Long, allow repetition rate dynamic tracking compensating control signal, it is achieved the locking of repetition rate；
Step 7, the femtosecond laser that repetition rate locks is divided into orthogonal by beam splitting portion 12
Detection laser pulse and exploring laser light pulse；
Step 8, detection laser pulse planoconvex lens 13 is radiated at quasiconductor sky after being focused
On line 14, produce terahertz emission, form THz wave.THz wave is by paraboloidal mirror 15
After collecting and converging, it is split filtration by high resistant silicon chip 16 so that the terahertz of required frequency
Hereby ripple passes through.
Step 9, it is to be checked that the permeation parts of THz wave is got in measuring samples receiving portion 17
On sample and reflected, the terahertz pulse being reflected back again passes by high resistant silicon chip 16 and is reflected
In terahertz pulse collection portion 18.Terahertz pulse collection portion 18 is positioned at exploring laser light pulse
Light path on, it is also gold-plated paraboloidal mirror, the terahertz pulse being reflected back through paraboloidal mirror receive
Collection converges at electro-optic crystal zinc telluridse 21；
Step 10, after exploring laser light pulse is focused by exploring laser light pulse concentration portion 22
Exploring laser light pulse passes terahertz pulse collection portion 18, is also concentrated in electro-optic crystal telluride
On zinc 21；
Step 11, space light path modulation portion regulation terahertz pulse and exploring laser light pulse institute warp
The spatial light path difference crossed, makes terahertz pulse and the spy simultaneously arriving electro-optic crystal zinc telluridse 21
Survey the integral multiple at laser pulse difference adjacent pulse interval；
Step 12, zinc telluridse crystal 21 has birefringence effect under the influence of terahertz pulse,
Two-beam road polarizes through quarter wave plate 22 regulation after converging, and by PBS beam splitter 23 beam splitting
After by photoelectric probe PD24 be collected detection, utilize linear translation platform scan sample believe
Breath detection.
Embodiment effect and effect
According to the present embodiment provide THz wave time-domain information anticoincidence pulse detection device and
The anticoincidence pulse detection method of THz wave time-domain information, owing to space light path modulation portion can regulate
Terahertz pulse and exploring laser light pulse the spatial light path difference of process so that terahertz pulse with
Arrive the integral multiple at the exploring laser light pulse difference adjacent pulse interval of probe portion simultaneously, thus should
Method can adjust according to testee size in the case of whole light path system determines in real time
Optical path difference so that the design of whole system is no longer limited by testee size, has broken away from tradition
The restriction to testee volume of the terahertz time-domain spectroscopy system；Simultaneously as can utilize different
Pulse detects, and the design of whole optical system tends to miniaturization, practical；Heavier
, the method has broken time-domain spectroscopy system can only carry out closely elemental analysis
Limit, near field, far field material all can be realized the time-domain information scanning of THz wave, thus will
Terahertz time-domain spectroscopy analysis is extended to remote component analysis and material detection.
Claims (4)
1. the anticoincidence pulse detection device of a THz wave time-domain information, it is characterised in that have:
There is the femtosecond laser generating unit of certain repetition rate, the femtosecond laser that output repetition rate is stable；
Beam splitting portion, is arranged in the light path of the locked described femtosecond laser of repetition rate, for described femtosecond laser is divided into orthogonal detection laser pulse and exploring laser light pulse；
Terahertz pulse forming portion, is arranged on the upstream of detection laser pulse light path, is used for producing terahertz emission, forms THz wave；
Measuring samples receiving portion, is arranged on the downstream of detection laser pulse light path, is used for accommodating measuring samples；
Terahertz pulse collection portion, is collected at measuring samples the described terahertz pulse that is reflected back by described measuring samples for air exercise；
Exploring laser light pulse concentration portion, is arranged on the upstream of described exploring laser light pulse light path, for being focused described exploring laser light pulse；
Probe portion, detects described terahertz pulse and the information of described exploring laser light pulse closing bundle at this simultaneously；
Space light path modulation portion, regulate described terahertz pulse and described exploring laser light pulse the space light path of process, make described terahertz pulse with the exploring laser light pulse arriving described probe portion simultaneously and differ the integral multiple that adjacent pulse is spaced；And
Terahertz pulse reduction portion, uses the time-domain information of the described exploring laser light pulse described terahertz pulse to concurrently arriving described probe portion to be sampled scanning, and reduces the time-domain information of described terahertz pulse.
The anticoincidence pulse detection device of THz wave time-domain information the most according to claim 1, it is characterised in that:
Wherein, the femtosecond laser generating unit described in certain repetition rate includes:
Femto-second laser, exports the femtosecond laser of certain repetition rate, and its resonator cavity end is fixedly installed piezoelectric ceramics, after pump light enters resonator cavity, forms beat signal；
Photodetector, it is arranged in the light path of described femtosecond laser, capture is through the femtosecond laser of reflecting mirror, and use tunable defection signal as reference, the repetition rate detecting the described femto-second laser obtained with it is mixed, and produces an error signal representing laser instrument repetition rate and standard frequency difference；
Low pass filter, filters the high-frequency signal in described error signal, obtains low frequency head error signal；
Preamplifier, is amplified described low frequency head error signal；
Loop control unit, exports compensating control signal after exaggerated described error signal enters；And
Modulation booster amplifier, drives that described piezoelectric ceramics produces displacement and to change chamber long, allows repetition rate dynamic tracking compensating control signal, it is achieved the locking of repetition rate.
3. the anticoincidence pulse detection method of a THz wave time-domain information, it is characterised in that comprise the following steps:
Step 1, uses femto-second laser to export the femtosecond laser of certain repetition rate, after described femtosecond laser enters the resonator cavity being provided with piezoelectric ceramics, forms beat signal；
Step 2, use photodetector capture through the femtosecond laser of reflecting mirror, and tunable defection signal is mixed as reference, the repetition rate detecting the described femto-second laser obtained with it, produce an error signal representing laser instrument repetition rate and standard frequency difference；
Step 3, uses low pass filter to filter the high-frequency signal in described error signal, obtains low frequency head error signal；
Step 4, uses preamplifier to be amplified described low frequency head error signal；
Step 5, uses loop control unit to export compensating control signal after exaggerated described error signal enters；
Step 6, uses modulation booster amplifier, drives that described piezoelectric ceramics produces displacement and to change chamber long, allows repetition rate dynamic tracking compensating control signal, it is achieved the locking of repetition rate；
Step 7, the described femtosecond laser using beam splitting portion repetition rate to be locked is divided into orthogonal detection laser pulse and exploring laser light pulse；
Step 8, uses terahertz pulse forming portion to produce terahertz emission, forms THz wave；
Step 9, uses terahertz pulse convergence portion air exercise to converge at measuring samples the described terahertz pulse that is reflected back by described measuring samples；
Step 10, uses exploring laser light pulse concentration portion to be focused the described exploring laser light pulse through lens；
Step 11, uses probe portion to detect described terahertz pulse and the information of described exploring laser light pulse simultaneously；
Step 12, use space light path modulation portion regulate described terahertz pulse and described exploring laser light pulse the spatial light path difference of process, make described terahertz pulse with the exploring laser light pulse arriving described probe portion simultaneously and differ the integral multiple that adjacent pulse is spaced；
Step 13, uses the time-domain information of the terahertz pulse reduction portion described terahertz pulse to concurrently arriving described probe portion to be sampled scanning, and reduces the time-domain information of described terahertz pulse.
The anticoincidence pulse detection method of THz wave time-domain information the most according to claim 3, it is characterised in that:
Wherein, it is the n-th-m that described terahertz-wave pulse arrives the target pulse of described probe portion, and it is the n-th-w that described exploring laser light pulse arrives the target pulse of described probe portion, and the condition that the optical path difference that these two pulses arrive described probe portion simultaneously should meet is:
Δ=(| (n-m)-(n-w) |) c*k/f
Wherein, n is integer, represents first pulse behind beam splitting portion；C is the spread speed of laser, i.e. the light velocity；K is the refractive index of medium；F is the repetition rate of femto-second laser；N-m represents and arrives the pulse of probe portion in Terahertz light path is the m-th pulse behind beam splitting portion；N-w represents and arrives the pulse of probe portion in reference laser pulse light path is the w pulse behind beam splitting portion.
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