CN106323469A - Electronically controlled optical sampling system, method and terahertz time-domain spectrometer - Google Patents
Electronically controlled optical sampling system, method and terahertz time-domain spectrometer Download PDFInfo
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- CN106323469A CN106323469A CN201610812095.6A CN201610812095A CN106323469A CN 106323469 A CN106323469 A CN 106323469A CN 201610812095 A CN201610812095 A CN 201610812095A CN 106323469 A CN106323469 A CN 106323469A
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000005070 sampling Methods 0.000 title claims abstract description 9
- 230000003287 optical effect Effects 0.000 title abstract description 5
- 239000013307 optical fiber Substances 0.000 claims abstract description 17
- 238000005086 pumping Methods 0.000 claims description 37
- 238000001514 detection method Methods 0.000 claims description 35
- 230000005540 biological transmission Effects 0.000 claims description 21
- 238000001328 terahertz time-domain spectroscopy Methods 0.000 claims description 19
- 238000012545 processing Methods 0.000 claims description 11
- 230000009123 feedback regulation Effects 0.000 claims description 5
- 229910000530 Gallium indium arsenide Inorganic materials 0.000 claims description 4
- KXNLCSXBJCPWGL-UHFFFAOYSA-N [Ga].[As].[In] Chemical compound [Ga].[As].[In] KXNLCSXBJCPWGL-UHFFFAOYSA-N 0.000 claims description 4
- 239000000835 fiber Substances 0.000 claims description 4
- 230000005855 radiation Effects 0.000 claims description 4
- 230000001960 triggered effect Effects 0.000 claims description 4
- 229910052691 Erbium Inorganic materials 0.000 claims description 2
- 210000001367 artery Anatomy 0.000 claims description 2
- 229910052790 beryllium Inorganic materials 0.000 claims description 2
- ATBAMAFKBVZNFJ-UHFFFAOYSA-N beryllium atom Chemical compound [Be] ATBAMAFKBVZNFJ-UHFFFAOYSA-N 0.000 claims description 2
- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical group [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 claims description 2
- 210000003462 vein Anatomy 0.000 claims description 2
- 230000033228 biological regulation Effects 0.000 claims 1
- 239000006185 dispersion Substances 0.000 abstract description 4
- 230000001934 delay Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000013519 translation Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000000686 essence Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
Classifications
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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
- G01J3/42—Absorption spectrometry; Double beam spectrometry; Flicker spectrometry; Reflection spectrometry
- G01J3/433—Modulation spectrometry; Derivative spectrometry
-
- 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
- G01J3/02—Details
- G01J3/06—Scanning arrangements arrangements for order-selection
-
- 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
- G01J3/42—Absorption spectrometry; Double beam spectrometry; Flicker spectrometry; Reflection spectrometry
-
- 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
- G01J3/02—Details
- G01J3/06—Scanning arrangements arrangements for order-selection
- G01J2003/064—Use of other elements for scan, e.g. mirror, fixed grating
-
- 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
- G01J3/42—Absorption spectrometry; Double beam spectrometry; Flicker spectrometry; Reflection spectrometry
- G01J2003/423—Spectral arrangements using lasers, e.g. tunable
-
- 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
- G01J3/42—Absorption spectrometry; Double beam spectrometry; Flicker spectrometry; Reflection spectrometry
- G01J3/433—Modulation spectrometry; Derivative spectrometry
- G01J2003/4334—Modulation spectrometry; Derivative spectrometry by modulation of source, e.g. current modulation
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- General Physics & Mathematics (AREA)
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- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention is applicable to the technical field of terahertz, and provides an electronically controlled optical sampling system, a method and a terahertz time-domain spectrometer. The electronically controlled optical sampling system comprises a first femtosecond pulse laser, a second femtosecond pulse laser, a first beam splitter, a second beam splitter, a first photoelectric sensor, a second photoelectric sensor, a phase detector, a function generator, an adder and a PID regulator, wherein the first beam splitter is connected with the first femtosecond pulse laser via an optical fiber; the second beam splitter is connected with the second femtosecond pulse laser via an optical fiber; the second femtosecond pulse laser comprises a piezoelectric sensor; both the first photoelectric sensor and the second photoelectric sensor are connected with the phase detector; the phase detector, the function generator and the PID regulator are all connected with the adder; and the PID regulator is also connected with the piezoelectric sensor. The electronically controlled optical sampling system is adopted for realizing time-domain scanning, a stable beam spreading direction can be effectively ensured, the dispersion is small, and the scanning speed is quick.
Description
Technical field
The invention belongs to Terahertz Technology field, particularly relate to a kind of automatically controlled smooth sampler, method and terahertz time-domain
Spectrogrph.
Background technology
Terahertz time-domain spectroscopy instrument can carry out coherent measurement to Terahertz electric field, it is possible to obtain sample complex refractivity index,
The parameter such as dielectric constant and electrical conductivity, can obtain the physical chemistry information of sample, have important by analyzing these parameters
Application prospect.
But, existing terahertz time-domain spectroscopy instrument generally uses mechanical delay device (step motor control linear translation
Platform) realize phase delay control, there is direction of beam propagation unstable, there is change in spot size, scanning due to dispersion
The shortcomings such as speed is slow.
Summary of the invention
It is an object of the invention to provide a kind of automatically controlled smooth sampler, method and terahertz time-domain spectroscopy instrument, it is intended to solve
Certainly existing terahertz time-domain spectroscopy instrument generally uses mechanical delay device (step motor control linear translation platform) to realize phase
The shortcomings such as position delays time to control, exists direction of beam propagation unstable, and spot size exists change due to dispersion, and scanning speed is slow
Problem.
The present invention is achieved in that a kind of automatically controlled smooth sampler, and it includes the first femtosecond pulse laser, second flies
Pulse per second (PPS) laser instrument, the first beam splitter, the second beam splitter, the first photoelectric sensor, the second photoelectric sensor, phase detector,
Functional generator, adder and PID regulator；
Described first beam splitter is connected with described first femtosecond pulse laser by optical fiber, and described second beam splitter passes through
Optical fiber is connected with described second femtosecond pulse laser, and described second femtosecond pulse laser includes piezoelectric transducer, and described
One photoelectric sensor and described second photoelectric sensor are all connected with described phase detector, described phase detector, described letter
Number generator and described PID regulator are all connected with described adder, and described PID regulator is also with described piezoelectric transducer even
Connect；
Described first femtosecond pulse laser launches pumping pulse, and described pumping pulse beam splitting is by described first beam splitter
Transmission pumping pulse and reflection pumping pulse, wherein, described reflection pumping pulse is launched to described first photoelectric sensor；Described
Described reflection pumping pulse is converted to the first electric impulse signal and passes to described phase detector by the first photoelectric sensor；
Described functional generator output phase modulated signal, described piezoelectric transducer regulates according to described phase modulated signal
The cavity length of described second femtosecond pulse laser, controls described second femtosecond pulse laser and launches and described pumping pulse
Between exist preset phase difference direct impulse, described second beam splitter by described direct impulse beam splitting be transmission detection pulse and
Reflection direct impulse, wherein, described reflection direct impulse is launched to described second photoelectric sensor；Described second photoelectric sensor
Described reflection direct impulse is converted to the second electric impulse signal and passes to described phase detector；
It is poor that described phase detector detects described preset phase, and generates and the described preset phase linear positively related electricity of difference
Pressure signal；Described functional generator persistently exports described phase modulated signal, and described adder is by described voltage signal and described
Export to described PID regulator after phase modulated signal superposition；The signal that described adder is exported by described PID regulator is carried out
Export after calibrating for error to described piezoelectric transducer, the signal feedback that described piezoelectric transducer exports according to described PID regulator
Regulate the cavity length of described second femtosecond pulse laser.
The present invention also provides for a kind of terahertz time-domain spectroscopy instrument, and described terahertz time-domain spectroscopy instrument includes electricity as above
Control light sampler, also includes that terahertz emission device, collimation focusing battery of lens, terahertz detection device and data process mould
Block；
Described data processing module is connected with described functional generator and described terahertz detection device, described Terahertz spoke
Injection device is connected with described first beam splitter by optical fiber, and described terahertz detection device is by optical fiber and described second beam splitter
Connect；
The described transmission pumping pulse of reception of described terahertz emission device, and by described transmission pumping pulse exciting radiation too
Hertz wave；Described THz wave is collimated and focuses on by described collimation lens set, and is sent to described terahertz detection device；
Described terahertz detection device receives described transmission detection pulse, described transmission detection pulse and described THz wave is converted into
Current signal, described data processing module is triggered by described functional generator, and described current signal is processed as digital signal.
The present invention also provides for a kind of automatically controlled smooth sampling method, and described method is based on above-mentioned automatically controlled smooth sampler or above-mentioned
Terahertz time-domain spectroscopy instrument realize, described method includes:
First femto-second laser launches pumping pulse；
Functional generator output phase modulated signal；
Piezoelectric transducer regulates the cavity length of described second femto-second laser according to described phase modulated signal, controls institute
State the second femtosecond pulse laser and launch the direct impulse that there is preset phase difference between described pumping pulse；
It is poor that phase detector detects described preset phase, and generates and described preset phase difference linear positively related voltage letter
Number；
Functional generator persistently exports described phase modulated signal；
Adder exports to PID regulator after described voltage signal and described phase modulated signal superposition；
Described PID regulator detects whether the signal of its input is 0；
If it is not, the second femtosecond described in the signal feedback regulation that exports according to described PID regulator of the most described piezoelectric transducer
The cavity length of pulse laser, to regulate the phase place of described direct impulse.
Compared with prior art, it has the beneficial effects that the present invention:
Scan by using automatically controlled smooth sampler to realize time domain, can effectively ensure that stable, the color of direction of beam propagation
Dissipate little, scanning speed is fast.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the automatically controlled smooth sampler that the embodiment of the present invention provides；
Fig. 2 is the structured flowchart of the terahertz time-domain spectroscopy instrument that the embodiment of the present invention provides.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, right
The present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, not
For limiting the present invention.
Automatically controlled smooth sampler in the present invention refers to sample (ECOPS, Electronically based on automatically controlled light
Controlled Optical Sampling) hardware system of technology, following embodiment is based on this technology and realizes.
As it is shown in figure 1, the automatically controlled smooth sampler 100 that the present embodiment provides includes the first femtosecond pulse laser 1, second
Femtosecond pulse laser the 2, first beam splitter the 3, second beam splitter the 4, first photoelectric sensor the 5, second photoelectric sensor 6, phase place
Detector 7, functional generator 8, adder 9 and PID (ratio (proportion), integration (integration), differential
(differentiation)) actuator 10.
In the present embodiment, the first beam splitter 3 is connected with the first femtosecond pulse laser 1 by optical fiber 12, the second beam splitter 4
Being connected with the second femtosecond pulse laser 2 by optical fiber 13, the second femtosecond pulse laser 2 includes piezoelectric transducer 21, first
Photoelectric sensor 5 and the second photoelectric sensor 6 are all connected with phase detector 7, phase detector 7, functional generator 8 and PID
Actuator 10 is all connected with adder 9, and PID regulates 10 devices and is also connected with piezoelectric transducer 21, and figure hollow core arrow represents light path
Transmission direction, filled arrows represents that the signal of telecommunication transmits direction.
In a particular application, the first femtosecond pulse laser 1 and the second femtosecond pulse laser 2 all can select er-doped light
Fibre laser, in the present embodiment, the first femtosecond pulse laser 1 and the second femtosecond pulse laser 2 all select centre wavelength
1560nm, repetition rate are 100MHZ, pulse power is the erbium doped fiber laser of 140mW.
In the present embodiment, the first photoelectric sensor 5 and the second photoelectric sensor 6 are photodiode.
In the present embodiment, the transflection ratio of the first beam splitter 3 and the second beam splitter 4 is 9:1, i.e. through the first beam splitter
3 and second the energy of transmitted pulse of beam splitter 4 more than the energy of pulse reflected by the first beam splitter 3 and the second beam splitter 4.
In a particular application, optical fiber 12 and optical fiber 13 all use polarization-maintaining single-mode fiber, it is ensured that light path is not trembled
Dynamic.
The operation principle of the automatically controlled smooth sampler 100 that the present embodiment is provided is:
First femtosecond pulse laser 1 launches pumping pulse, and pumping pulse beam splitting is transmission pumping arteries and veins by the first beam splitter 3
Punching and reflection pumping pulse, wherein, described reflection pumping pulse is launched to the first photoelectric sensor 5；First photoelectric sensor 5 will
Described reflection pumping pulse is converted to the first electric impulse signal and passes to phase detector 7；
Functional generator 8 exports phase modulated signal, and piezoelectric transducer 21 regulates second according to described phase modulated signal
The cavity length of femtosecond pulse laser 2, control the second femtosecond pulse laser 2 launch exist between described pumping pulse pre-
If the direct impulse of phase contrast, described direct impulse beam splitting is transmission detection pulse and reflection direct impulse by the second beam splitter 4,
Wherein, described reflection direct impulse is launched to the second photoelectric sensor 6；Second photoelectric sensor 6 is by described reflection direct impulse
Be converted to the second electric impulse signal and pass to phase detector 7；
It is poor that phase detector 7 detects described preset phase, and generates and the described preset phase linear positively related voltage of difference
Signal；Functional generator 8 persistently exports phase modulated signal, and adder 9 is by described voltage signal and described phase modulated signal
Export after superposition to PID regulator 10；PID regulator 10 exports to pressure after calibrating for error the signal that adder 9 exports
Electric transducer 21, signal feedback regulation the second femtosecond pulse laser 2 that piezoelectric transducer 21 exports according to PID regulator 10
Cavity length, to regulate the phase place of described direct impulse, and then regulates described direct impulse prolonging relative to described pumping pulse
Time the time.
In the present embodiment, described pumping pulse and described direct impulse are femto-second laser pulse, in the present embodiment are only
In order to the pulse of same nature is distinguished, and use different name.
In a particular application, when functional generator 8 does not export phase modulated signal to adder 9, automatically controlled light samples
The phase contrast that system 100 can lock between the first femtosecond pulse laser 1 and the second femtosecond pulse laser 2 is 90 degree；Work as letter
Number generator 8 provides the phase modulated signal V ofoffsetTime (compensation voltage), automatically controlled smooth sampler 100 then can lock
Phase contrast between one femtosecond pulse laser 1 and the second femtosecond pulse laser 2 is ΔΦ, makes phase detector 7 export one
Individual voltage signal-Voffset, thus ensureing that adder 9 exports to the signal of PID regulator 10 is 0 (Voffset+(-Voffset)=
0)。
Based on above-mentioned automatically controlled smooth sampler, phase modulated signal VoffsetAnd the functional relationship between phase contrast ΔΦ
Expression formula is:
Voffset(t)=A0cos(ΔΦ(t))； (1)
Wherein, A0For the coefficient relevant to the measuring condition of phase contrast ΔΦ；
The expression formula of the functional relationship between time delays τ (t) and phase contrast ΔΦ is:
τ (t)=ΔΦ (t)/2 π f； (2)
Wherein, f is the repetition rate of laser instrument；
Can be obtained by formula (1) and formula (2), time delays τ (t) and phase modulated signal VoffsetBetween functional relation be:
τ (t)=cos-1(Voffset(t)/A0)/2πf。 (3)
From formula (3), prolonging between the signal of the first femtosecond pulse laser 1 and the output of the second femtosecond pulse laser
The phase modulated signal of time difference function generator 8 output is relevant, therefore it may only be necessary to the phase place making functional generator 8 export is adjusted
The frequency of signal processed, amplitude scalable, it is possible to realize defeated to the first femtosecond pulse laser 1 and the second femtosecond pulse laser
The control of the phase contrast between the signal gone out, thus realize the first femtosecond pulse laser 1 and the second femtosecond pulse laser
The control of the delay time between the signal of output.
In the present embodiment, the second femtosecond pulse laser 2 is relative to the change of cavity length scope of the first femtosecond pulse laser 1
For [-120nm ,+120nm], the time delay of 0.4fs can be realized, the rate of scanning of system can be effectively improved.
The present embodiment, by providing a kind of automatically controlled smooth sampler, uses two femto-second laser output laser pulses, adopts
There is provided phase modulated signal with functional generator, and use piezoelectric transducer to control the signal of two femtosecond pulse laser radiation
Phase contrast, compared with traditional mechanical delay device, can effectively ensure that direction of beam propagation stable, dispersion is little, scanning is fast
Degree is fast.
As in figure 2 it is shown, the present embodiment provides a kind of terahertz time-domain spectroscopy instrument, including above-mentioned automatically controlled smooth sampler
100, also include terahertz emission device 14, collimation focusing battery of lens, terahertz detection device 15 and data processing module 19.
Wherein, data processing module 19 function generator 8 and terahertz detection device 15 connect, terahertz emission device
14 are connected with the first beam splitter 3 by optical fiber 12, and terahertz detection device 15 is connected with the second beam splitter 4 by optical fiber 13.
In a particular application, terahertz emission device 14 includes that the indium gallium arsenide photoelectric that can increase carrier mobility leads sky
Line, what terahertz detection device 15 included reducing carrier mobility mixes beryllium indium gallium arsenide photoelectric lead antenna.
The operation principle of the terahertz time-domain spectroscopy instrument that the present embodiment provides is:
Terahertz emission device 14 receives by the transmission pumping pulse of the first beam splitter 3 outgoing, and by transmission pumping pulse
Exciting radiation THz wave；THz wave is collimated and focuses on by collimation lens set, and is sent to terahertz detection device 15；
Terahertz detection device 15 receives by the transmission detection pulse of the second beam splitter 4 outgoing, by transmission detection pulse and THz wave
Being converted into current signal, data processing module 19 is triggered by functional generator 8, current signal is processed as digital signal.
In the present embodiment, automatically controlled smooth sampler 100 also includes being connected between PID regulator 11 and piezoelectric transducer 21
The first signal amplifier 11, the first signal amplifier for amplify PID regulator 11 output signal and pass to piezoelectricity pass
Sensor 21.
In the present embodiment, collimation focusing battery of lens includes the first off axis paraboloidal mirror 16 and the second off axis paraboloidal mirror 17,
Wherein, the first off axis paraboloidal mirror 16 be transmitted to after the THz wave collimation that terahertz emission device 14 is radiated second from
Axis paraboloidal mirror 17, the second off axis paraboloidal mirror 17 is for focusing to terahertz detection device 15 by the THz wave after collimation
Photosurface.
In the present embodiment, data processing module 19 includes secondary signal amplifier 191 and digital converter 192；
Secondary signal amplifier 191 is connected with terahertz detection device 15, is used for amplifying terahertz detection device 15 and exports
Current signal and export to digital converter 192；Digital converter 192 and secondary signal amplifier 192 and functional generator 8
Connecting, for being triggered by functional generator 8, the current signal after amplifying is processed as digital signal.
In a particular application, described digital signal can be binary signal.
In a particular application, automatically controlled smooth sampler 100 can integrally disposed be a single module, terahertz emission
Device 14, collimation focusing battery of lens and terahertz detection device 15 can also be integrated into the single module of, two modules
Between connected by optical fiber and to realize signal and transmit, the current signal then exported by terahertz detection device 15 by cable is passed
It is defeated by data processing module 19 and carries out data process, thus the modularity realizing terahertz time-domain spectroscopy instrument is arranged, and simplifies structure,
It is beneficial to install and maintenance.
One embodiment of the invention also provides for a kind of automatically controlled smooth sampling method, and the method is based on above-mentioned automatically controlled smooth sampler
Or above-mentioned terahertz time-domain spectroscopy instrument realizes, described method includes:
First femto-second laser launches pumping pulse；
Functional generator output phase modulated signal；
Piezoelectric transducer regulates the cavity length of described second femto-second laser according to described phase modulated signal, controls institute
State the second femtosecond pulse laser and launch the direct impulse that there is preset phase difference between described pumping pulse；
It is poor that phase detector detects described preset phase, and generates and described preset phase difference linear positively related voltage letter
Number；
Functional generator persistently exports described phase modulated signal；
Adder exports to PID regulator after described voltage signal and described phase modulated signal superposition；
Described PID regulator detects whether the signal of its input is 0；
If it is not, the second femtosecond described in the signal feedback regulation that exports according to described PID regulator of the most described piezoelectric transducer
The cavity length of pulse laser, to regulate the phase place of described direct impulse.
The embodiment of the present invention is by providing a kind of automatically controlled smooth sampling method, and available software control method realizes automatically controlled light
The delays time to control of sampler, improves the rate of scanning of system.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention
Any amendment, equivalent and the improvement etc. made within god and principle, should be included within the scope of the present invention.
Claims (10)
1. an automatically controlled smooth sampler, it is characterised in that described automatically controlled smooth sampler include the first femtosecond pulse laser,
Second femtosecond pulse laser, the first beam splitter, the second beam splitter, the first photoelectric sensor, the second photoelectric sensor, phase place are visited
Survey device, functional generator, adder and PID regulator；
Described first beam splitter is connected with described first femtosecond pulse laser by optical fiber, and described second beam splitter passes through optical fiber
Being connected with described second femtosecond pulse laser, described second femtosecond pulse laser includes piezoelectric transducer, described first light
Electric transducer and described second photoelectric sensor are all connected with described phase detector, and described phase detector, described function are sent out
Raw device and described PID regulator are all connected with described adder, and described PID regulator is also connected with described piezoelectric transducer；
Described first femtosecond pulse laser launches pumping pulse, and described pumping pulse beam splitting is transmission by described first beam splitter
Pumping pulse and reflection pumping pulse, wherein, described reflection pumping pulse is launched to described first photoelectric sensor；Described first
Described reflection pumping pulse is converted to the first electric impulse signal and passes to described phase detector by photoelectric sensor；
Described functional generator output phase modulated signal, described piezoelectric transducer is according to the regulation of described phase modulated signal
The cavity length of the second femtosecond pulse laser, controls described second femtosecond pulse laser and launches between described pumping pulse
There is the direct impulse of preset phase difference, described direct impulse beam splitting is transmission detection pulse and reflection by described second beam splitter
Direct impulse, wherein, described reflection direct impulse is launched to described second photoelectric sensor；Described second photoelectric sensor is by institute
State reflection direct impulse be converted to the second electric impulse signal and pass to described phase detector；
It is poor that described phase detector detects described preset phase, and generates and described preset phase difference linear positively related voltage letter
Number；Described functional generator persistently exports described phase modulated signal, and described adder is by described voltage signal and described phase place
Export to described PID regulator after modulated signal superposition；The signal that described adder is exported by described PID regulator carries out error
Export after calibration to described piezoelectric transducer, the signal feedback regulation that described piezoelectric transducer exports according to described PID regulator
The cavity length of described second femtosecond pulse laser.
Automatically controlled smooth sampler the most as claimed in claim 1, it is characterised in that described automatically controlled smooth sampler also includes connecting
The first signal amplifier between PID regulator and described piezoelectric transducer.
Automatically controlled smooth sampler the most as claimed in claim 1, it is characterised in that described first femtosecond pulse laser and described
Second femtosecond pulse laser is erbium doped fiber laser.
Automatically controlled smooth sampler the most as claimed in claim 1, it is characterised in that the energy of described transmission pumping pulse is more than institute
Stating the energy of reflection pumping pulse, the energy of described transmission detection pulse is more than the energy of described reflection detection arteries and veins.
Automatically controlled smooth sampler the most as claimed in claim 1, it is characterised in that described first photoelectric sensor and described second
Photoelectric sensor is photodiode.
6. a terahertz time-domain spectroscopy instrument, it is characterised in that described terahertz time-domain spectroscopy instrument includes such as Claims 1 to 5
Automatically controlled smooth sampler described in any one, also includes terahertz emission device, collimation focusing battery of lens, terahertz detection device
And data processing module；
Described data processing module is connected with described functional generator and described terahertz detection device, and described terahertz emission fills
Putting and be connected with described first beam splitter by optical fiber, described terahertz detection device is by optical fiber with described second beam splitter even
Connect；
Described terahertz emission device receives described transmission pumping pulse, and by described transmission pumping pulse exciting radiation Terahertz
Ripple；Described THz wave is collimated and focuses on by described collimation lens set, and is sent to described terahertz detection device；Described
Terahertz detection device receives described transmission detection pulse, and described transmission detection pulse and described THz wave are converted into electric current
Signal, described data processing module is triggered by described functional generator, and described current signal is processed as digital signal.
7. terahertz time-domain spectroscopy instrument as claimed in claim 6, it is characterised in that described terahertz emission device includes increasing
The indium gallium arsenide photoelectric lead antenna of big carrier mobility, described terahertz detection device includes reducing carrier mobility
Mix beryllium indium gallium arsenide photoelectric lead antenna.
8. terahertz time-domain spectroscopy instrument as claimed in claim 6, it is characterised in that described collimation focusing battery of lens includes first
Off axis paraboloidal mirror and the second off axis paraboloidal mirror；
Described first off axis paraboloidal mirror will described THz wave collimate after be transmitted to described second off axis paraboloidal mirror, described the
THz wave after described collimation is focused to the photosurface of described terahertz detection device by two off axis paraboloidal mirrors.
9. terahertz time-domain spectroscopy instrument as claimed in claim 6, it is characterised in that described data processing module includes:
The secondary signal amplifier being connected with described terahertz detection device；And
The digital converter being connected with described secondary signal amplifier and described functional generator.
10. an automatically controlled smooth sampling method, it is characterised in that automatically controlled based on described in any one of Claims 1 to 5 of described method
Light sampler or the terahertz time-domain spectroscopy instrument as described in any one of claim 6～9 realize, and described method includes:
First femto-second laser launches pumping pulse；
Piezoelectric transducer regulates the cavity length of described second femto-second laser, controls described second femtosecond pulse laser and launches
And there is the direct impulse of preset phase difference between described pumping pulse；
It is poor that phase detector detects described preset phase, and generates and the described preset phase linear positively related voltage signal of difference；
Functional generator output phase modulated signal；
Adder exports to PID regulator after described voltage signal and described phase modulated signal superposition；
Described PID regulator detects whether the signal of its input is 0；
If it is not, the second femtosecond pulse described in the signal feedback regulation that exports according to described PID regulator of the most described piezoelectric transducer
The cavity length of laser instrument, to regulate the phase place of described direct impulse.
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| PCT/CN2017/085540 WO2018045777A1 (en) | 2016-09-09 | 2017-05-23 | Electrically-controlled optical sampling system and method, and terahertz time domain spectrometer |
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Cited By (2)
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| WO2018045777A1 (en) * | 2016-09-09 | 2018-03-15 | 华讯方舟科技有限公司 | Electrically-controlled optical sampling system and method, and terahertz time domain spectrometer |
| WO2018045778A1 (en) * | 2016-09-09 | 2018-03-15 | 深圳市太赫兹系统设备有限公司 | Electrically controlled optical sampling system and terahertz time-domain spectrometer |
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| CN106323469B (en) | 2019-05-03 |
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