CN109696242A - A kind of asynchronous frequency sweep THz time domain spectrum system - Google Patents
A kind of asynchronous frequency sweep THz time domain spectrum system Download PDFInfo
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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
- G01J3/12—Generating the spectrum; Monochromators
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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
Abstract
The present invention relates to a kind of asynchronous frequency sweep THz time domain spectrum systems, comprising: controller and the first laser device communicated respectively with controller and second laser, and the photoconductive antenna for generating and detecting THz wave；First laser device exports the first optical path and the second optical path, and the first optical path generates THz wave；The first light detection device is provided in second optical path；Second laser exports third optical path and the 4th optical path, and third optical path detects THz wave；The second light detection device is provided in 4th optical path；First light detection device and the second light detection device are communicated with controller respectively；The pulse recurrence frequency of monitoring control devices the first light detection device and the second light detection device, and real-time feedback control first laser device and second laser, the pulse recurrence frequency for exporting laser is stable and differs a definite value always.The present invention utilizes two high-speed asynchronous controls of femto-second laser, can complete a terahertz pulse waveform acquisition in millisecond magnitude.
Description
Technical field
The present invention relates to Terahertz (THz) spectrum control technology fields, and in particular to a kind of asynchronous frequency sweep THz time domain spectrum
System.
Background technique
This part is introduced to reader may background technique relevant to various aspects of the invention, it is believed that can mention to reader
For useful background information, so that facilitating reader more fully understands various aspects of the invention.It is, therefore, to be understood that our department
Point explanation be for the above purpose, and not to constitute admission of prior art.
THz wave refer to frequency in the electromagnetic wave of 0.1THz to 10THz range, wavelength probably in 3mm to 30um range,
Between microwave and it is infrared between.On electromagnetic spectrum, the infrared and microwave technology of terahertz wave band two sides is highly developed, but
Be be related to terahertz wave band result of study and data it is considerably less, mainly by effective terahertz generation source and sensitive detector
Limitation, therefore this wave band is also referred to as the gap THz.With the series of new techniques eighties, the development of new material, especially
The development of ultrafast technology, so that obtaining the stable source pulse THz in broadband becomes a kind of quasi- routine techniques, THz technology is able to rapidly
Development, and one THz research boom is started in actual range.2004, THz science and technology was chosen as " changing future by U.S. government
The four of the big technology of the ten of the world ", and Japan is even more that THz technology is classified as " national pillar ten big emphasis war on January 8th, 2005
First of slightly target ", researched and developed by national efforts.Many countries and regions governments, mechanism, enterprise, university and research institution are confused
Confusingly put among the research and development upsurge of THz.It is in physics, chemistry, electronic information, life science, material science, astronomy, big
It advantage that multiple key areas such as gas and environmental monitoring, communication radar, national security and anti-terrorism have and huge answers
Gradually appeared with prospect.Wherein, THz wave spectral technology constitutes the chief technology of Terahertz application.
In recent years, there is asynchronous optical frequency sweep terahertz light spectra system, be respectively completed too using two femto-second lasers
The generation and detection of Hertz wave, thus instead of tradition machinery deferred mount.Between the femto-second laser pulse that two lasers generate
The phase is different every other week, i.e., repetition rate is different, has a small repetition rate poor between the two, this device is called asynchronous optics and adopts
Sample.The point-by-point sampling to THz wave can be completed using this difference on the frequency, i.e., with the difference on the frequency of an other femto-second laser
Come the difference on the frequency for replacing mechanical delay arrangement to generate.
In existing terahertz time-domain spectroscopy system, mechanical time deferred mount has the problems such as volume is big, speed is slow.Such as
The frequency sweep terahertz light spectra system occurred in recent years uses titanium sapphire femto-second laser, and volume is very big.Laser pulse simultaneously
Repetition rate is up to 1GHz, frequency high in this way, and asynchronous control circuit just needs many high frequency circuit chips, it is difficult to realize and stablize
The control of asynchronous locking phase, the asynchronous control circuit of two lasers is extremely complex and expensive.
Summary of the invention
Technical problems to be solved are how to provide a kind of asynchronous frequency sweep THz time domain spectrum system.
For the defects in the prior art, the present invention provides a kind of asynchronous frequency sweep THz time domain spectrum system, can make two
The repetition rate that laser exports pulse keeps stablizing, and remains a stable difference on the frequency.
In a first aspect, the present invention provides a kind of asynchronous frequency sweep THz time domain spectrum systems, comprising:
Controller and the first laser device communicated respectively with the controller and second laser；
The first laser device exports the first optical path and the second optical path, and first optical path generates THz wave；Described
The first light detection device is provided in two optical paths；
The second laser output third optical path and the 4th optical path, the third optical path detect THz wave；Described
The second light detection device is provided in four optical paths；
First light detection device and second light detection device are communicated with the controller respectively；
The pulse recurrence frequency of first light detection device described in the monitoring control devices and second light detection device, and
First laser device described in real-time feedback control and the second laser, the pulse recurrence frequency for exporting laser is stable and begins
The poor definite value of last phase.
Optionally, the controller includes:
First automatic control circuit and the second automatic control circuit；
The first laser device is communicated with first automatic control circuit；
It further include frequency synthesizer；First light detection device and first automatic control circuit and the frequency are comprehensive
Clutch communication；
The frequency synthesizer is communicated with second automatic control circuit；
The second laser is communicated with second automatic control circuit；
The pulse signal and standard clock signal for the first laser device that first light detection device obtains enter the
One automatic control circuit carries out locking phase, will output feedback voltage control when pulse frequency and standard clock signal frequency have deviation
Make the first laser device, to adjust the pulse recurrence frequency of the first laser device, be allowed at any time with standard clock frequency
It is identical；
First light detection device exports while entering the frequency synthesizer, handles by the frequency synthesizer,
This signal will enter the second automatic control circuit as standard-frequency signal, be locked with the pulse signal of the second laser
Phase, the second automatic control circuit output control signal, so that the frequency of the second laser and the first laser device
Frequency phase-difference predetermined value.
Optionally, the controller includes: clock unit, and the clock unit and first automatic control circuit are logical
Letter.
Optionally, the clock unit uses the constant-temperature crystal oscillator of frequency stabilization.
Optionally, the first filter has also been arranged in series between first light detection device and first automatic control circuit
Wave unit and the first amplifier；
The second filter unit has also been arranged in series between second light detection device and second automatic control circuit
With the second amplifier；
Third filter unit and have also been arranged in series between the first laser device and first automatic control circuit
Three amplifiers；
The 4th filter unit and have also been arranged in series between the second laser and second automatic control circuit
Four amplifiers；
The first electric impulse signal that first light detection device obtains is put by the first filter unit and the first amplifier
Greatly；The first electric impulse signal and clock signal after filter and amplification enter locking phase in the first automatic control circuit, and first is automatic
Control circuit exports first voltage signal, is loaded into first laser device after third filter unit and the amplification of third amplifier
Control terminal；
The second electric impulse signal that second light detection device obtains is put by the second filter unit and the second amplifier
Greatly；
The first electric impulse signal after filter and amplification enters the frequency synthesizer simultaneously, and the frequency synthesizer generates
One frequency shift (FS), the first pulse signal after frequency shift (FS) enter the second automatic control circuit, with the after filter and amplification
Two electric impulse signals carry out locking phase, and the second automatic control circuit exports second voltage signal, by the 4th filter unit and the 4th
The control terminal of second laser is loaded into after amplifier amplification.
Optionally, first filter unit, the second filter unit are the bandpass filters of centre frequency 100M.
Optionally, the controller further includes processor, and the processor controls first automatic control circuit, second
Automatic control circuit and the frequency synthesizer.
Optionally, the controller includes:
Second automatic control circuit and frequency synthesizer；First light detection device is communicated with the frequency synthesizer；
The frequency synthesizer is communicated with second automatic control circuit；The second laser and second automatic control circuit
Communication；
The pulse signal for the first laser device that first light detection device obtains enters the frequency synthesizer, warp
The frequency synthesizer processing is crossed, this signal will enter the second automatic control circuit as standard-frequency signal, with described second
The pulse signal of laser carries out locking phase, the second automatic control circuit output control signal, so that the second laser
Frequency and the first laser device frequency phase-difference predetermined value.
Optionally, the first filter unit has also been arranged in series between first light detection device and the frequency synthesizer
With the first amplifier；
The second filter unit has also been arranged in series between second light detection device and second automatic control circuit
With the second amplifier；
The 4th filter unit and have also been arranged in series between the second laser and second automatic control circuit
Four amplifiers；
The first electric impulse signal that first light detection device obtains is put by the first filter unit and the first amplifier
Greatly；
The second electric impulse signal that second light detection device obtains is put by the second filter unit and the second amplifier
Greatly；
The first electric impulse signal after filter and amplification enters the frequency synthesizer simultaneously, and the frequency synthesizer generates
One frequency shift (FS), the first pulse signal after frequency shift (FS) enter the second automatic control circuit, with the after filter and amplification
Two electric impulse signals carry out locking phase, and the second automatic control circuit exports second voltage signal, by the 4th filter unit and the 4th
The control terminal of second laser is loaded into after amplifier amplification.
Optionally, the first laser device and the second laser include piezoelectric ceramics, on piezoelectric ceramics plus different
The repetition rate of voltage, laser output pulse will change.
As shown from the above technical solution, the asynchronous frequency sweep THz time domain spectrum system that the present invention supplies, utilizes two femtosecond lasers
Device makes the repetition rate of two laser output pulses keep stablizing by high-speed asynchronous control, and remains a stabilization
Difference on the frequency.A terahertz pulse waveform acquisition can be completed in millisecond magnitude；It is constituted with two femto-second lasers asynchronous
Optical frequency sweep replaces tradition machinery deferred mount, while the rate used is reduced to a millisecond magnitude from dozens of minutes, realizes terahertz
The hereby high speed of spectrum, real-time detection.Circuit uses the clock signal of high stable frequency as benchmark, while stablizing two-way laser
Frequency；Using two-way PLL circuit, locking phase is completed, the offset of signal frequency is completed using 1 road DDS.Meanwhile the present invention can height
Integrated, all control functions are integrated on the same pcb board, are easy to implement miniaturization.
Detailed description of the invention
It, below will be to embodiment or the prior art in order to illustrate more clearly of the present invention or technical solution in the prior art
Attached drawing needed in description is made one and is simply introduced, it should be apparent that, the accompanying drawings in the following description is of the invention one
A little embodiments for those of ordinary skill in the art without creative efforts, can also be according to these
Attached drawing obtains other attached drawings.
Fig. 1 is a kind of asynchronous frequency sweep THz time domain spectrum system structure diagram in one embodiment of the invention；
Fig. 2 is a kind of asynchronous frequency sweep THz time domain spectrum system structure diagram in another embodiment of the present invention；
Fig. 3 is a kind of asynchronous frequency sweep THz time domain spectrum system structure diagram in another embodiment of the present invention；
Fig. 4 is a kind of asynchronous frequency sweep THz time domain spectrum system structure diagram in another embodiment of the present invention；
Fig. 5 is a kind of asynchronous frequency sweep THz time domain spectrum system structure diagram in another embodiment of the present invention.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with the attached drawing in the present invention, to this
Technical solution in invention is clearly and completely described, it is clear that and described embodiments are some of the embodiments of the present invention,
Instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative labor
Every other embodiment obtained under the premise of dynamic, shall fall within the protection scope of the present invention.
As shown in Figure 1, the embodiment of the present invention provides a kind of asynchronous frequency sweep THz time domain spectrum system, which includes: control
Device and the first laser device communicated respectively with controller and second laser；And the photoelectricity for generating and detecting THz wave
Lead antenna.First laser device exports the first optical path and the second optical path, and the first optical path generates THz wave；It is provided in second optical path
First light detection device；Second laser exports third optical path and the 4th optical path, and third optical path detects THz wave；4th optical path
On be provided with the second light detection device；First light detection device and the second light detection device are communicated with controller respectively；Controller
Monitor the pulse recurrence frequency of the first light detection device and the second light detection device, and real-time feedback control first laser device and
Dual-laser device, the pulse recurrence frequency for exporting laser is stable and differs a definite value always.Below to the embodiment of the present invention
Detailed description is unfolded in the asynchronous frequency sweep THz time domain spectrum system provided.
In embodiments of the present invention, first laser device and the optional optical fiber femtosecond laser of second laser, first laser device
Frequency be chosen as 100MHz, the frequency of second laser is chosen as 100MHz+100Hz.There is piezoelectricity in optical fiber femtosecond laser
Ceramics, on piezoelectric ceramics plus different voltages, the repetition rate of laser output pulse will change.The embodiment of the present invention uses
Optical fiber femtosecond laser replaces titanium sapphire femto-second laser, and whole system volume is greatly decreased.
As shown in Fig. 2, controller includes: the first automatic control circuit and the second automatic control circuit；First laser device with
The communication of first automatic control circuit；It further include frequency synthesizer；First light detection device and the first automatic control circuit and frequency
Synthesizer communication；Frequency synthesizer is communicated with the second automatic control circuit；Second laser is communicated with the second automatic control circuit；
First light detection device obtain first laser device pulse signal and standard clock signal enter the first automatic control circuit into
Output feedback voltage is controlled first laser device when pulse frequency and standard clock signal frequency have deviation by horizontal lock, thus
The pulse recurrence frequency for adjusting first laser device, is allowed to identical as standard clock frequency at any time；The output of first light detection device is same
When enter frequency synthesizer, handled by frequency synthesizer, this signal will as standard-frequency signal enter second automatically control
Circuit carries out locking phase, the second automatic control circuit output control signal, so that second laser with the pulse signal of second laser
The frequency of device and the frequency phase-difference predetermined value of first laser device.In embodiments of the present invention, first control circuit and the second control
Circuit can be selected as phase-locked loop PLL (Phase Locked Loop), phase-locked loop PLL be it is a kind of realize frequency-tracking from
Dynamic control circuit.Frequency synthesizer can be selected as DIGITAL FREQUENCY synthesizer DDS (Direct Digital Synthesizer)
For generating fixed frequency shift (FS).
In one embodiment of the invention, controller further include: clock unit, clock unit and first automatically control electricity
Road communication, clock unit use the constant-temperature crystal oscillator of frequency stabilization.Specifically, the first laser device that the first light detection device obtains
Pulse signal and standard clock signal enter the first phase-locked loop PLL1 and carry out locking phase, when pulse frequency and standard clock signal frequency
When rate has deviation, output feedback voltage control first laser device is allowed to adjust the pulse recurrence frequency of first laser device
At any time with standard clock frequency f0It is identical.First light detection device exports while entering DIGITAL FREQUENCY synthesizer DDS, passes through
DDS processing, frequency is by f0Become f1, this signal will enter the second phase-locked loop PLL2 as standard-frequency signal, with second laser
The pulse signal of device carries out locking phase.As long as in this way, standard clock signal frequency-invariant, the frequency of two lasers will all keep permanent
It is fixed, and the difference on the frequency kept constant.
As shown in figure 3, being also arranged in series the first filtering list between the first light detection device and the first automatic control circuit
Member and the first amplifier；Also be arranged in series between second light detection device and the second automatic control circuit the second filter unit and
Second amplifier；Third filter unit and third amplification have also been arranged in series between first laser device and the first automatic control circuit
Device；The 4th filter unit and the 4th amplifier have also been arranged in series between second laser and the second automatic control circuit；First
The first electric impulse signal that light detection device obtains amplifies by the first filter unit and the first amplifier；After filter and amplification
First electric impulse signal and clock signal enter locking phase in the first automatic control circuit, the first electricity of the first automatic control circuit output
Signal is pressed, the control terminal of first laser device is loaded into after third filter unit and the amplification of third amplifier；Second optical detection
The second electric impulse signal that device obtains amplifies by the second filter unit and the second amplifier；The first electricity after filter and amplification
Pulse signal enters frequency synthesizer simultaneously, and frequency synthesizer generates a frequency shift (FS), the first pulse letter after frequency shift (FS)
Number enter the second automatic control circuit, with after filter and amplification the second electric impulse signal carry out locking phase, second automatically control electricity
Road exports second voltage signal, and the control of second laser is loaded into after the 4th filter unit and the amplification of the 4th amplifier
End.In embodiments of the present invention, the first filter unit, the second filter unit are chosen as the bandpass filter of centre frequency 100M.
First amplifier, the second amplifier, third amplifier and the 4th amplifier are chosen as operational amplifier.
Specifically, the first optical fiber femtosecond laser and the selection of PRFs 100MHz of optical fiber femtosecond laser or so.
The arteries and veins for the second laser that the pulse signal and the second light detection device for the first laser device that first light detection device obtains obtain
Signal is rushed, the bandpass filter of centre frequency 100M is initially entered, radio frequency amplifier is entered after filtering and is amplified.After filter and amplification
The first electric impulse signal two-way is divided by power splitter, first via signal enters locking phase in the first phase-locked loop chip PLL1, the
One phase-locked loop chip PLL1 exports a voltage signal, is loaded into the first femtosecond laser after low-pass filtering and voltage value amplification
The control terminal of the piezoelectric ceramics of device.Meanwhile second road signal enters DIGITAL FREQUENCY synthesizer DDS, generates a frequency shift (FS),
And this signal is entered into the second phase-locked loop chip PLL2, locking phase, the second phase-locked loop chip are carried out with the signal after filter and amplification
PLL exports a voltage signal, and the piezoelectric ceramics of the second femto-second laser is loaded into after low-pass filtering and voltage value amplification
Control terminal.Controller further includes processor, and processor controls the first automatic control circuit, the second automatic control circuit and frequency
Synthesizer.First electric impulse signal PLL, the second electric impulse signal PLL and digital frequency synthesizer in embodiments of the present invention
DDS chip is controlled by a processor, and processor can be selected as FPGA (field programmable gate array) chip.Certainly may be used
To understand, the embodiment of the present invention is not limited only to this, and processor can also use MCU (Microcontroller Unit, microcontroller
Unit), CPLD (Complex Programmable Logic Device, Complex Programmable Logic Devices), DSP (Digital
Signal Process, Digital Signal Processing) etc. data processing chips the present invention still may be implemented.In embodiments of the present invention
DDS chip is optional using the AD9915 of ADI company or other close models, and the simulation output that can generate highest 1.4GHz is sinusoidal
Wave.Frequency tuning resolution ratio: 120mHz.PLL chip uses the ADF4002 or other close models of ADI company.In ADF4002
Portion is integrated with phase frequency detector and charge pump radio frequency amplifier, using HMC580:20dB fixed gain amplifier.
As shown in figure 4, controller includes: that the second automatic control circuit and frequency are comprehensive in another embodiment of the present invention
Clutch；First light detection device is communicated with frequency synthesizer；Frequency synthesizer is communicated with the second automatic control circuit；Second laser
Device is communicated with the second automatic control circuit；The pulse signal for the first laser device that first light detection device obtains enters frequency synthesis
Device is handled by frequency synthesizer, this signal will enter the second automatic control circuit as standard-frequency signal, with second laser
The pulse signal of device carries out locking phase, the second automatic control circuit output control signal, so that the frequency of second laser and first
The frequency phase-difference predetermined value of laser.
As shown in figure 5, being also arranged in series the first filter unit and between the first light detection device and frequency synthesizer
One amplifier；The second filter unit and second has also been arranged in series between second light detection device and the second automatic control circuit to put
Big device；The 4th filter unit and the 4th amplifier have also been arranged in series between second laser and the second automatic control circuit；The
The first electric impulse signal that one light detection device obtains amplifies by the first filter unit and the first amplifier；Second optical detection dress
The second electric impulse signal for setting acquisition amplifies by the second filter unit and the second amplifier；The first electric arteries and veins after filter and amplification
It rushes signal while entering frequency synthesizer, frequency synthesizer generates a frequency shift (FS), the first pulse signal after frequency shift (FS)
Into the second automatic control circuit, locking phase, the second automatic control circuit are carried out with the second electric impulse signal after filter and amplification
Second voltage signal is exported, the control terminal of second laser is loaded into after the 4th filter unit and the amplification of the 4th amplifier.
The institutes such as frequency shift (FS), control voltage output in the embodiment of the present invention are functional, can be completed using existing commercial chip
The functional realization of institute.
In conclusion asynchronous frequency sweep THz time domain spectrum system provided by the invention is passed through using two femto-second lasers
High-speed asynchronous control makes the repetition rate of two laser output pulses keep stablizing, and remains a stable frequency
Difference；A terahertz pulse waveform acquisition can be completed in millisecond magnitude.It is swept with the asynchronous optics that two femto-second lasers are constituted
Frequency replaces tradition machinery deferred mount, while the rate used is reduced to a millisecond magnitude from dozens of minutes, realizes tera-hertz spectra
High speed, real-time detection.Circuit uses the clock signal of high stable frequency as benchmark, while stablizing two-way laser frequency；
Using two-way PLL circuit, locking phase is completed, the offset of signal frequency is completed using 1 road DDS.Meanwhile the present invention can be highly integrated,
All control functions are integrated on the same pcb board, are easy to implement miniaturization.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.Term " on ", "lower" etc. refer to
The orientation or positional relationship shown is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of the description present invention and simplifies
Description, rather than the device or element of indication or suggestion meaning must have a particular orientation, constructed and grasped with specific orientation
Make, therefore is not considered as limiting the invention.Unless otherwise clearly defined and limited, term " installation ", " connected ",
" connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can be
Mechanical connection, is also possible to be electrically connected；It can be directly connected, two can also be can be indirectly connected through an intermediary
Connection inside element.For the ordinary skill in the art, above-mentioned term can be understood at this as the case may be
Concrete meaning in invention.
In specification of the invention, numerous specific details are set forth.Although it is understood that the embodiment of the present invention can
To practice without these specific details.In some instances, well known method, structure and skill is not been shown in detail
Art, so as not to obscure the understanding of this specification.Similarly, it should be understood that disclose in order to simplify the present invention and helps to understand respectively
One or more of a inventive aspect, in the above description of the exemplary embodiment of the present invention, each spy of the invention
Sign is grouped together into a single embodiment, figure, or description thereof sometimes.However, should not be by the method solution of the disclosure
Release is in reflect an intention that i.e. the claimed invention requires more than feature expressly recited in each claim
More features.More precisely, as the following claims reflect, inventive aspect is less than single reality disclosed above
Apply all features of example.Therefore, it then follows thus claims of specific embodiment are expressly incorporated in the specific embodiment,
It is wherein each that the claims themselves are regarded as separate embodiments of the invention.It should be noted that in the absence of conflict, this
The feature in embodiment and embodiment in application can be combined with each other.The invention is not limited to any single aspect,
It is not limited to any single embodiment, is also not limited to any combination and/or displacement of these aspects and/or embodiment.And
And can be used alone each aspect and/or embodiment of the invention or with other one or more aspects and/or its implementation
Example is used in combination.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme should all cover within the scope of the claims and the description of the invention.
Claims (10)
1. a kind of asynchronous frequency sweep THz time domain spectrum system characterized by comprising
Controller and the first laser device communicated respectively with the controller and second laser；
The first laser device exports the first optical path and the second optical path, and first optical path generates THz wave；Second light
Road is provided with the first light detection device；
The second laser output third optical path and the 4th optical path, the third optical path detect THz wave；4th light
Road is provided with the second light detection device；
First light detection device and second light detection device are communicated with the controller respectively；
The pulse recurrence frequency of first light detection device described in the monitoring control devices and second light detection device, and in real time
First laser device described in feedback control and the second laser, the pulse recurrence frequency stabilization for exporting laser and always phase
A poor definite value.
2. asynchronous frequency sweep THz time domain spectrum system according to claim 1, which is characterized in that the controller includes:
First automatic control circuit and the second automatic control circuit；
The first laser device is communicated with first automatic control circuit；
It further include frequency synthesizer；First light detection device and first automatic control circuit and the frequency synthesizer
Communication；
The frequency synthesizer is communicated with second automatic control circuit；
The second laser is communicated with second automatic control circuit；
The pulse signal and standard clock signal for the first laser device that first light detection device obtains enter first certainly
Dynamic control circuit carries out locking phase, will output feedback voltage control institute when pulse frequency and standard clock signal frequency have deviation
First laser device is stated, to adjust the pulse recurrence frequency of the first laser device, is allowed to identical as standard clock frequency at any time；
First light detection device exports while entering the frequency synthesizer, handles by the frequency synthesizer, this letter
It number will enter the second automatic control circuit as standard-frequency signal, and carry out locking phase with the pulse signal of the second laser,
The second automatic control circuit output control signal, so that the frequency of the frequency of the second laser and the first laser device
Rate differs predetermined value.
3. asynchronous frequency sweep THz time domain spectrum system according to claim 2, which is characterized in that when the controller includes:
Clock unit, the clock unit are communicated with first automatic control circuit.
4. asynchronous frequency sweep THz time domain spectrum system according to claim 3, which is characterized in that the clock unit uses
The constant-temperature crystal oscillator of frequency stabilization.
5. asynchronous frequency sweep THz time domain spectrum system according to claim 2, which is characterized in that
The first filter unit and have also been arranged in series between first light detection device and first automatic control circuit
One amplifier；
The second filter unit and have also been arranged in series between second light detection device and second automatic control circuit
Two amplifiers；
Third filter unit has also been arranged in series between the first laser device and first automatic control circuit and third is put
Big device；
The 4th filter unit and the 4th is also arranged in series between the second laser and second automatic control circuit to put
Big device；
The first electric impulse signal that first light detection device obtains amplifies by the first filter unit and the first amplifier；Through
The first electric impulse signal and clock signal after filter and amplification enter locking phase in the first automatic control circuit, and first automatically controls electricity
Road exports first voltage signal, and the control of first laser device is loaded into after third filter unit and the amplification of third amplifier
End；
The second electric impulse signal that second light detection device obtains amplifies by the second filter unit and the second amplifier；
The first electric impulse signal after filter and amplification enters the frequency synthesizer simultaneously, and the frequency synthesizer generates one
Frequency shift (FS), the first pulse signal after frequency shift (FS) enter the second automatic control circuit, with the second electricity after filter and amplification
Pulse signal carries out locking phase, and the second automatic control circuit exports second voltage signal, amplifies by the 4th filter unit and the 4th
The control terminal of second laser is loaded into after device amplification.
6. asynchronous frequency sweep THz time domain spectrum system according to claim 5, which is characterized in that first filter unit,
Second filter unit is the bandpass filter of centre frequency 100M.
7. asynchronous frequency sweep THz time domain spectrum system according to claim 2, which is characterized in that the controller further includes
Processor, the processor control first automatic control circuit, the second automatic control circuit and the frequency synthesizer.
8. asynchronous frequency sweep THz time domain spectrum system according to claim 1, which is characterized in that the controller includes:
Second automatic control circuit and frequency synthesizer；First light detection device is communicated with the frequency synthesizer；It is described
Frequency synthesizer is communicated with second automatic control circuit；The second laser and second automatic control circuit are logical
Letter；
The pulse signal for the first laser device that first light detection device obtains enters the frequency synthesizer, by institute
Frequency synthesizer processing is stated, this signal will enter the second automatic control circuit as standard-frequency signal, with the second laser
The pulse signal of device carries out locking phase, the second automatic control circuit output control signal, so that the frequency of the second laser
The frequency phase-difference predetermined value of rate and the first laser device.
9. asynchronous frequency sweep THz time domain spectrum system according to claim 8, which is characterized in that
The first filter unit and the first amplification have also been arranged in series between first light detection device and the frequency synthesizer
Device；
The second filter unit and have also been arranged in series between second light detection device and second automatic control circuit
Two amplifiers；
The 4th filter unit and the 4th is also arranged in series between the second laser and second automatic control circuit to put
Big device；
The first electric impulse signal that first light detection device obtains amplifies by the first filter unit and the first amplifier；
The second electric impulse signal that second light detection device obtains amplifies by the second filter unit and the second amplifier；
The first electric impulse signal after filter and amplification enters the frequency synthesizer simultaneously, and the frequency synthesizer generates one
Frequency shift (FS), the first pulse signal after frequency shift (FS) enter the second automatic control circuit, with the second electricity after filter and amplification
Pulse signal carries out locking phase, and the second automatic control circuit exports second voltage signal, amplifies by the 4th filter unit and the 4th
The control terminal of second laser is loaded into after device amplification.
10. asynchronous frequency sweep THz time domain spectrum system described in -9 any one according to claim 1, the first laser device and
The second laser includes piezoelectric ceramics, different voltages is added on piezoelectric ceramics, the repetition rate that laser exports pulse will
It changes.
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