CN104458645A - Method and system for realizing continuous terahertz spectrum detection - Google Patents
Method and system for realizing continuous terahertz spectrum detection Download PDFInfo
- Publication number
- CN104458645A CN104458645A CN201410742447.6A CN201410742447A CN104458645A CN 104458645 A CN104458645 A CN 104458645A CN 201410742447 A CN201410742447 A CN 201410742447A CN 104458645 A CN104458645 A CN 104458645A
- Authority
- CN
- China
- Prior art keywords
- optical fiber
- continuous
- laser
- terahertz
- tera
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention provides a method and a system for realizing continuous terahertz spectrum detection. A pair of high-stability single longitudinal mode near-infrared lasers serve as seed light sources, a laser signal is modulated by utilizing optical fibers, and continuous terahertz waves are radiated outwards under external bias potential by virtue of an optical mixer; and the terahertz waves are subjected to coherent detection at a signal receiving end by adopting a photoconductive switch and an antenna. The temperature modulation is performed on the lasers, and wide bandwidth difference frequency continuous terahertz radiation output is realized. Compared with a common terahertz time-domain impulse spectral system, the system has the advantages that the spectral resolution acquired by the technology is greatly improved, and the system has an excellent effect of promoting the development of terahertz spectroscopy and related fields.
Description
Technical field
The present invention relates to optical application technical field, particularly relate to a kind of method and system realizing the detection of continuous tera-hertz spectra.
Background technology
In recent years, along with the fast development of Terahertz Technology in every field, the applied research of THz wave spectral technique is also more extensive.Due to the many merits of THz wave self, Terahertz application technology has the been extended to various aspects of actual life.Such as, in public safety context of detection, Terahertz wave energy is through some common infrared materials that cannot penetrate, and as plastics package, envelope and semiconductor medium etc. are nonpolarity material, so be suitable for the detection of things concealed very much; Even more important, drugs and TNT have its special Terahertz dactylogram, and employing terahertz light spectral technology can improve the detection efficiency to dangerous material and contraband goods, has enriched the means of safety check.At biomedical aspect, different tissues tissue (fat, skin and muscle) has differential absorption to THz wave, in addition, Terahertz is very responsive to moisture in tissue, based on this two feature, terahertz light spectral technology can detect the difference between skin factor of different biological cell, as skin burn region, and skin canceration region etc.Meanwhile, THz wave energy, far below high energy particle ray such as X ray, can not produce ionization damage to biological tissue, so safer, and compares to microwave ultrasound technology, has benefited from the wavelength that it is shorter, and the image of acquisition has higher resolution.
Because THz source is relative with the development of detector slowly, constrain the development of terahertz light spectral technology to a certain extent.At present, terahertz time-domain spectroscopic technology uses comparatively extensive, and this technology radiation THz wave mainly adopts two kinds of means: (1) is based on the quadratic nonlinearity effect of nonlinear crystal; (2) based on electro-optic effect, photoconductive antenna is adopted to give off THz wave.All adopt coherent detection technology in end of probe, the terahertz emission energy being limited to time-domain spectroscopy system is low, so system must be placed in vacuum; On the other hand, response signal is time domain impulsive signals, so system must be equipped with corresponding mechanical time lag line, levels of precision requires high, causes system architecture complicated, must carry out Fourier transform to time-domain signal can obtain frequency domain spectra simultaneously, terahertz signal intensity is low, and spectral resolution is generally at 10 more than GHz, and spectral resolution is lower, for the sharp-pointed absorption peak None-identified of some pure materials (as gas), limit the application of terahertz light spectral technology.So, simplify spectroscopic system, improve system suitability and improve spectral resolution for terahertz light spectral technology, just seem especially important.
Author of the present invention conducts in-depth research tera-hertz spectra application system aspects, propose a kind of technology and the system that realize the detection of continuous tera-hertz spectra, terahertz light spectral resolution is significantly improved, is conducive to the development and application of terahertz light spectral technology.
Summary of the invention
The shortcoming of prior art in view of the above, the object of the present invention is to provide a kind of method and system realizing continuous tera-hertz spectra detector, for solving the problem that in prior art, terahertz signal intensity is low, spectral resolution is low.
For achieving the above object and other relevant objects, the invention provides a kind of system realizing continuous tera-hertz spectra detector, described system at least comprises: light source module, modulation optical fiber module and test module;
Described light source module comprises the first laser instrument, second laser and power amplifier, and described power amplifier is connected with second laser with described first laser instrument respectively by optical fiber;
Described optic module comprises the first optical fiber and the second optical fiber that are picked out by described power amplifier output, and described first optical fiber and the second optical fiber regulate the phase place of laser signal respectively by voltage modulator;
Described test module comprises continuous terahertz light generation device, transmission/transmitting light path device and coherent detection device, and described continuous terahertz light generation device is connected with described first optical fiber; The terahertz light that described continuous terahertz light generation device produces is incident to described coherent detection device and detects after described transmission/reflected light path device is collected and converged, and described coherent detection device is also connected with described second optical fiber.
Realize the scheme of a kind of optimization of the system of continuous tera-hertz spectra detection as the present invention, described first laser instrument and second laser are single longitudinal mode distributed Feedback near infrared laser, realize frequency modulation (PFM) by a temperature modulator.
The scheme of a kind of optimization of the system of continuous tera-hertz spectra detection is realized as the present invention, the centre wavelength of described first laser instrument and second laser is 855nm, by the modulation of described temperature modulator, realize the difference frequency output area of 50MHz ~ 2THz, corresponding thermoregulator scope is 0 ~ 50K.
Realize the scheme of a kind of optimization of the system of continuous tera-hertz spectra detection as the present invention, the laser signal that described power amplifier exports carries out Signal separator by a fiber optic splitter by 1:1, and the signal of separation enters described first optical fiber and the second optical fiber respectively.
Realize a kind of scheme of optimization of the system of continuous tera-hertz spectra detection as the present invention, material, the length of optical fiber selected by described first optical fiber and the second optical fiber are all identical with performance parameter, realize the effective suppression to optical fiber temperature drift effect.
The scheme of a kind of optimization of the system of continuous tera-hertz spectra detection is realized as the present invention, described continuous terahertz light generation device comprises and being opened the light and the first optical mixer unit of forming of the first antenna by the first photoconduction, described first optical fiber opens the light with the first photoconduction and is connected, and the continuous terahertz light of generation is penetrated by described first day wire spoke.
The scheme of a kind of optimization of the system of continuous tera-hertz spectra detection is realized as the present invention, according to the difference of measurement pattern, described transmission/reflected light path device is transmitted light path device or reflected light path device, the Terahertz super lens that described transmitted light path device is 50mm by one group of 90 ° of off axis paraboloidal mirror and one group of focal length forms, sample is placed in lens focus place, and continuous terahertz light penetrates sample; The Terahertz super lens that described reflected light path device is 50mm by one group of 45 ° of off axis paraboloidal mirror and one group of focal length forms, and sample is placed in lens focus place, and continuous terahertz light is by sample reflection.
The scheme of a kind of optimization of the system of continuous tera-hertz spectra detection is realized as the present invention, described coherent detection device comprises the second optical mixer unit be made up of the second photoconductivity switching and the second antenna, described second photoconductivity switching is connected with the second optical fiber, described second antenna receives the terahertz light after described transmission/reflected light path device is collected, laser signal and terahertz light signal produce response light electric current at described second photoconductivity switching place Coherent coupling, carry out reading detection again by converting voltage signal to by a phase-locked detector.
The present invention also provides a kind of method realizing the detection of continuous tera-hertz spectra, and described method at least comprises:
1) bias voltage bright dipping is applied to the first laser instrument and second laser, laser signal after power amplifier is divided into two bundles, a branch ofly enter continuous terahertz light generation device by the first coupling fiber, on described continuous terahertz light generation device after biasing, produce terahertz emission and launch; Another bundle laser signal enters the second optical fiber;
2) terahertz light produced, after being placed in the sample of transmission/reflected light path device, enters coherent detection module with the laser signal of the second optical fiber simultaneously, and two-beam coupling produces photocurrent and read photo-signal by phase-locked detector;
3) described first laser instrument and second laser is regulated, both changes frequency, the frequency domain scanning of tera-hertz spectra is realized by difference frequency, wherein, at each frequency place, laser signal in second optical fiber and the terahertz light input coherent detection module received, the signal determination maximum value of sampling in the relevant cycle, the maximum value at last each frequency place comprehensive obtains Terahertz frequency domain spectra figure.
The scheme of a kind of optimization of the method for continuous tera-hertz spectra detection is realized as the present invention, voltage modulator is utilized to export sine voltage signal to modulate the length of described first optical fiber and the second optical fiber, realize the phase-modulation to laser signal, complete the coherent detection of continuous terahertz light, the average signal-to-noise ratio of system in whole frequency range is greater than 60db, and the resolution of tera-hertz spectra is 50MHz.
As mentioned above, the invention provides a kind of method and system realizing the detection of continuous tera-hertz spectra, in view of the limitation of conventional time domain tera-hertz spectra system, as low spectral resolution, time delay line, the aspects such as the low and test environment vacuum of terahertz signal intensity, the present invention preferentially adopts high-performance Distributed Feedback Laser temperature modulation difference frequency to produce continuous THz wave, the high stability of laser frequency makes the terahertz light spectral resolution obtained significantly improve, modulation optical fiber is adopted to realize the complexity that coherent detection effectively reduces spectroscopic system, be very beneficial for the development of terahertz light spectral technology, significant in the practical application of terahertz light spectroscopy.
Accompanying drawing explanation
Fig. 1 is a kind of schematic diagram that the present invention realizes the system of continuous tera-hertz spectra detection.
Fig. 2 is the another kind of schematic diagram that the present invention realizes the system of continuous tera-hertz spectra detection.
Fig. 3 is the air terahertz light spectrogram that the present invention obtains.
Element numbers explanation
1 light source module
11 first laser instruments
12 second lasers
13 power amplifiers
14 temperature modulator
15 optical fiber
2 modulation optical fiber modules
21 first optical fiber
22 second optical fiber
3 test modules
31 terahertz light generation devices
311 first photoconductivity switchings
312 first antennas
312 biasing devices
32 transmissions/transmitting light path device
321 off axis paraboloidal mirrors
322 lens
33 coherent detection devices
331 second photoconductivity switchings
332 second antennas
4 phase-locked detectors
5 samples
Embodiment
Below by way of specific instantiation, embodiments of the present invention are described, those skilled in the art the content disclosed by this instructions can understand other advantages of the present invention and effect easily.The present invention can also be implemented or be applied by embodiments different in addition, and the every details in this instructions also can based on different viewpoints and application, carries out various modification or change not deviating under spirit of the present invention.
Refer to accompanying drawing.It should be noted that, the diagram provided in the present embodiment only illustrates basic conception of the present invention in a schematic way, then only the assembly relevant with the present invention is shown in graphic but not component count, shape and size when implementing according to reality is drawn, it is actual when implementing, and the kenel of each assembly, quantity and ratio can be a kind of change arbitrarily, and its assembly layout kenel also may be more complicated.
At present, terahertz light spectral technology generally adopts time-domain spectroscopy system, and utilize Fourier transform processing time domain impulsive signals to obtain frequency domain spectra, terahertz signal intensity is low, and spectral resolution is not high; Given this, the invention provides a kind of method and system realizing continuous terahertz detection, based on optical frequency mixing technology, adopt the high and near infrared laser of maturation of stability as seed light source, obtain continuous print tera-hertz spectra in conjunction with photoconductive antenna technology, by temperature control modulated laser frequency, the tera-hertz spectra that aerial radiation goes out reaches the spectral resolution of MHz magnitude, compared to conventional terahertz time-domain spectroscopic technology, spectral resolution is significantly improved.Meanwhile, the structure of the continuous tera-hertz spectra detection system of realization of the present invention is simple, easy to implement.To the present invention be elaborated realize the principle of method and system and the embodiment of the detection of continuous tera-hertz spectra below, and make those skilled in the art not need creative work can understand the method and system of the continuous tera-hertz spectra detection of realization of the present invention.
The invention provides a kind of system realizing the detection of continuous tera-hertz spectra, as depicted in figs. 1 and 2, described system at least comprises: light source module 1, modulation optical fiber module 2 and test module 3.
Described light source module 1 comprises the first laser instrument 11, second laser 12 and power amplifier 13, described power amplifier 13 is connected with second laser 12 with described first laser instrument 11 respectively by optical fiber 15, laser signal is coupled into power amplifier 13 by optical fiber 15, and average laser power can be risen to the magnitude of 150mW by power amplifier.
Wherein, described first laser instrument 11 and second laser 12 are high-performance single longitudinal mode distributed Feedback (DFB) near infrared laser, and centre wavelength is 855nm, and single light power is about 40mW.Described light source module 1 also comprises the temperature modulator 14 be connected with second laser 12 with described first laser instrument 11, is modulated the wavelength of the first laser instrument 11 and second laser 12, thus realize the adjustment of two laser frequency by refining temperature.Further, the temperature modulation speed of temperature modulator 14 is 25GHz/K, range of adjustment is 0 ~ 50K, and the adjustable extent of corresponding first laser instrument 11 and second laser 12 frequency is 50MHz ~ 2THz, and after modulation, the frequency of the first laser instrument 11 and second laser 12 is unequal.
Described optic module 2 comprises the first optical fiber 21 and the second optical fiber 22 picked out by described power amplifier 13 output terminal, and described first optical fiber 21 and the second optical fiber 22 regulate the phase place of laser signal respectively by voltage modulator (diagram).
Wherein, it should be noted that, the laser signal that described power amplifier 13 exports carries out Signal separator by a fiber optic splitter (diagram) by 1:1, and the signal of separation enters described first optical fiber 21 and the second optical fiber 22 respectively.Material, the length of optical fiber selected by described first optical fiber 21 and the second optical fiber 22 are preferably all identical with optical parametric, effectively can suppress the temperature drift effect of optical fiber like this.Utilize voltage modulator to modulate the length of described first optical fiber 21 and the second optical fiber 22, and then realize the modulation to two bundles laser phase (light path) respectively.In the present embodiment, export sine voltage signal by voltage modulator and carry out modulation optical fiber length.
Described test module 3 comprises continuous terahertz light generation device 31, transmission/transmitting light path device 32 and coherent detection device 33, and described continuous terahertz light generation device 31 is connected with described first optical fiber 21; The terahertz light that described continuous terahertz light generation device 31 produces is incident to described coherent detection device 33 and detects after described transmission/reflected light path device 32 is collected and converged, and described coherent detection device 33 is also connected with described second optical fiber 22.
Wherein, described continuous terahertz light generation device 31 comprises and to be opened the light 311 and first the first optical mixer unit that form of antenna 312 by the first photoconduction.Particularly, described first optical fiber 21 and the first photoconduction open the light and 311 to be connected, and the continuous terahertz light of generation is given off by described first antenna 312.It should be noted that, described continuous terahertz light generation device 31 also comprises 311 biasing devices be connected 313 that to open the light with described first photoconduction, for giving described continuous terahertz light generation device 31 biasing.In the present embodiment, the first photoconductivity switching 311 of described first optical mixer unit is chosen as GaAs material, and bandwidth can to 3THz, and the continuous terahertz radiation power of transmitting can reach 1 microwatt, and signal to noise ratio (S/N ratio) reaches as high as 80db.
According to the difference of measurement pattern, described transmission/reflected light path device 32 is transmitted light path device or reflected light path device, is made up of respectively difference from the off axis paraboloidal mirror group 321 of axle degree and Terahertz super lens 322.Be specially: as shown in Figure 1, the Terahertz super lens 322 that described transmitted light path device is 50mm by one group of 90 ° of off axis paraboloidal mirror 321 and one group of focal length forms, and sample is placed in lens 322 focus place, and continuous terahertz light penetrates sample 5; As shown in Figure 2, the Terahertz super lens 322 that described reflected light path device is 50mm by one group of 45 ° of off axis paraboloidal mirror 321 and one group of focal length forms, and sample is placed in lens 322 focus place, and continuous terahertz light is reflected by sample 5.
Described coherent detection device 33 comprises the second optical mixer unit be made up of the second photoconductivity switching 331 and the second antenna 332, described second photoconductivity switching 331 is connected with the second optical fiber 22, described second antenna 332 receives the terahertz light after described transmission/reflected light path device 32 is collected, laser signal and terahertz light signal produce response light electric current at described second photoconductivity switching 332 place Coherent coupling, carry out reading detection again by converting voltage signal to by a phase-locked detector 4.Particularly, in the present embodiment, described phase-locked detector 4 is lock-in amplifier.
For the embodiment making those skilled in the art understand detection system of the present invention further, relative theory of the present invention and the concrete method using detection system of the present invention will be described in detail below.
The present invention also provides a kind of method realizing contacting tera-hertz spectra detection, and described method at least comprises the following steps:
First step 1 is performed), bias voltage bright dipping is applied to the first laser instrument and second laser, laser signal after power amplifier is divided into two bundles, a branch ofly enter continuous terahertz light generation device by the first coupling fiber, on described continuous terahertz light generation device after biasing, produce terahertz emission and launch; Another bundle laser signal enters the second optical fiber.
The present embodiment is to test the tera-hertz spectra of air, transmission mode is as shown in Figure 1 adopted to carry out spectral measurement, first laser instrument and second laser adopt Distributed Feedback Laser, and the length of the first optical fiber and the second optical fiber is regulated by voltage modulator, and concrete operation step is as follows:
1-1) drive Distributed Feedback Laser, driving voltage is 9V, and when temperature modulator is not opened, the centre wavelength of two laser instruments is 855nm;
1-2) etc. after two laser stabilization, then open power amplifier, wait for about 30 seconds, power amplifier is stablized;
1-3) open the voltage modulator of optical fiber, select sinusoidal modulation signal U=U
0sin (2 π f
st), voltage magnitude is 80V, f
sfor voltage modulated frequency, be set to 1kHz.
Then step 2 is performed), the terahertz light produced is after being placed in the sample of transmission/reflected light path device, enter coherent detection module with the laser signal of the second optical fiber, two-beam coupling produces photocurrent and is read photo-signal by phase-locked detector simultaneously.
The specific operation process of this step is:
2-1) additional 10V bias voltage and the first optical mixer unit (Tx) difference frequency produce continuous print terahertz emission;
2-2) adopt transmission mode light path, the tera-hertz spectra of test air, without any target barrier THz wave (being namely equivalent to sample is air) in light path, under light path is placed in open laboratory environment, relative air humidity is 35%, and temperature is 24 DEG C.
2-3) open the lock-in amplifier of coherent detection module, the response light electric current of the second photoconductivity switching is detected.
Finally perform step 3), regulate described first laser instrument and second laser, both changes frequency, the frequency domain scanning of tera-hertz spectra is realized by difference frequency, wherein, at each frequency place, the laser signal in the second optical fiber and the terahertz light input coherent detection module received, the signal determination maximum value of sampling in the relevant cycle, the maximum value at last each frequency place comprehensive obtains Terahertz frequency domain spectra figure.
Particularly, setting testing laser device temperature control modulation range is 4 DEG C ~ 49 DEG C, and corresponding test frequency scope is 0.2 ~ 1.8THz, and frequency sweeping step-length is 50MHz.The average signal-to-noise ratio of system in whole frequency range is greater than 60db, and the resolution of tera-hertz spectra is 50MHz.
As shown in Figure 3, interior illustration is arrow indication low-frequency range moisture sorption peak enlarged diagram to the air terahertz light spectrogram of final acquisition.Can find out, spectrum is mainly subject to the inhalation effects of aqueous vapor in air, the little absorption peak of aqueous vapor near low-frequency range 560GHz and 750GHz also can be observed clearly in spectral line, and amplify known to the moisture sorption peak at 560GHz place, the half-peak breadth at this peak is about 10GHz.
In sum, the invention provides a kind of method and system realizing the detection of continuous tera-hertz spectra, adopt the single longitudinal mode near infrared laser of a pair high stability as seed light source, utilize optical fiber modulated laser signal, optical mixer unit outwards gives off continuous print THz wave under applying bias; At signal receiving end, photoconductivity switching and antenna is adopted to carry out coherent detection to THz wave.By carrying out temperature modulation to laser instrument, the continuous terahertz emission of difference frequency realizing wide bandwidth exports.Compared with common terahertz time-domain pulse spectrum system, the spectral resolution of this technical limit spacing is greatly improved, and plays good impetus to the development of terahertz light spectroscopy and association area thereof.
So the present invention effectively overcomes various shortcoming of the prior art and tool high industrial utilization.
It should be noted that, in this article, the such as relational terms of first and second grades and so on is only used for an entity or operation to separate with another entity or operational zone, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment comprising described key element and also there is other identical element.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention.Any person skilled in the art scholar all without prejudice under spirit of the present invention and category, can modify above-described embodiment or changes.Therefore, such as have in art usually know the knowledgeable do not depart from complete under disclosed spirit and technological thought all equivalence modify or change, must be contained by claim of the present invention.
Claims (10)
1. realize a system for continuous tera-hertz spectra detection, it is characterized in that, described system at least comprises: light source module, modulation optical fiber module and test module;
Described light source module comprises the first laser instrument, second laser and power amplifier, and described power amplifier is connected with second laser with described first laser instrument respectively by optical fiber;
Described optic module comprises the first optical fiber and the second optical fiber that are picked out by described power amplifier output, and described first optical fiber and the second optical fiber regulate the phase place of laser signal respectively by voltage modulator;
Described test module comprises continuous terahertz light generation device, transmission/transmitting light path device and coherent detection device, and described continuous terahertz light generation device is connected with described first optical fiber; The terahertz light that described continuous terahertz light generation device produces is incident to described coherent detection device and detects after described transmission/reflected light path device is collected and converged, and described coherent detection device is also connected with described second optical fiber.
2. the system of the continuous tera-hertz spectra detection of realization according to claim 1, is characterized in that: described first laser instrument and second laser are single longitudinal mode distributed Feedback near infrared laser, realize frequency modulation (PFM) by a temperature modulator.
3. the system of the continuous tera-hertz spectra detection of realization according to claim 2, it is characterized in that: the centre wavelength of described first laser instrument and second laser is 855nm, by the modulation of described temperature modulator, realize the difference frequency output area of 50MHz ~ 2THz, corresponding thermoregulator scope is 0 ~ 50K.
4. the system of the continuous tera-hertz spectra detection of realization according to claim 1, it is characterized in that: the laser signal that described power amplifier exports carries out Signal separator by a fiber optic splitter by 1:1, and the signal of separation enters described first optical fiber and the second optical fiber respectively.
5. the system of realization according to claim 1 continuous tera-hertz spectra detection, is characterized in that: material, the length of optical fiber selected by described first optical fiber and the second optical fiber are all identical with performance parameter, realize the effective suppression to optical fiber temperature drift effect.
6. the system of the continuous tera-hertz spectra detection of realization according to claim 1, it is characterized in that: described continuous terahertz light generation device comprises and being opened the light and the first optical mixer unit of forming of the first antenna by the first photoconduction, described first optical fiber opens the light with the first photoconduction and is connected, and the continuous terahertz light of generation is penetrated by described first day wire spoke.
7. the system of the continuous tera-hertz spectra detection of realization according to claim 1, it is characterized in that: according to the difference of measurement pattern, described transmission/reflected light path device is transmitted light path device or reflected light path device, the Terahertz super lens that described transmitted light path device is 50mm by one group of 90 ° of off axis paraboloidal mirror and one group of focal length forms, sample is placed in lens focus place, and continuous terahertz light penetrates sample; The Terahertz super lens that described reflected light path device is 50mm by one group of 45 ° of off axis paraboloidal mirror and one group of focal length forms, and sample is placed in lens focus place, and continuous terahertz light is by sample reflection.
8. the system of the continuous tera-hertz spectra detection of realization according to claim 1, it is characterized in that: described coherent detection device comprises the second optical mixer unit be made up of the second photoconductivity switching and the second antenna, described second photoconductivity switching is connected with the second optical fiber, described second antenna receives the terahertz light after described transmission/reflected light path device is collected, laser signal and terahertz light signal produce response light electric current at described second photoconductivity switching place Coherent coupling, carry out reading detection again by converting voltage signal to by a phase-locked detector.
9. utilize system described in any one of claim 1 ~ 8 to realize the method for continuous tera-hertz spectra detection, it is characterized in that, described method at least comprises:
1) bias voltage bright dipping is applied to the first laser instrument and second laser, laser signal after power amplifier is divided into two bundles, a branch ofly enter continuous terahertz light generation device by the first coupling fiber, on described continuous terahertz light generation device after biasing, produce terahertz emission and launch; Another bundle laser signal enters the second optical fiber;
2) terahertz light produced, after being placed in the sample of transmission/reflected light path device, enters coherent detection module with the laser signal of the second optical fiber simultaneously, and two-beam coupling produces photocurrent and read photo-signal by phase-locked detector;
3) described first laser instrument and second laser is regulated, both changes frequency, the frequency domain scanning of tera-hertz spectra is realized by difference frequency, wherein, at each frequency place, laser signal in second optical fiber and the terahertz light input coherent detection module received, the signal determination maximum value of sampling in the relevant cycle, the maximum value at last each frequency place comprehensive obtains Terahertz frequency domain spectra figure.
10. the method for the continuous tera-hertz spectra detection of realization according to claim 9, it is characterized in that: utilize voltage modulator to export sine voltage signal to modulate the length of described first optical fiber and the second optical fiber, realize the phase-modulation to laser signal, complete the coherent detection of continuous terahertz light, the average signal-to-noise ratio of system in whole frequency range is greater than 60db, and the resolution of tera-hertz spectra is 50MHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410742447.6A CN104458645A (en) | 2014-12-05 | 2014-12-05 | Method and system for realizing continuous terahertz spectrum detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410742447.6A CN104458645A (en) | 2014-12-05 | 2014-12-05 | Method and system for realizing continuous terahertz spectrum detection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104458645A true CN104458645A (en) | 2015-03-25 |
Family
ID=52905055
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410742447.6A Pending CN104458645A (en) | 2014-12-05 | 2014-12-05 | Method and system for realizing continuous terahertz spectrum detection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104458645A (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105334182A (en) * | 2015-12-10 | 2016-02-17 | 中国科学院重庆绿色智能技术研究院 | All-fiber terahertz quasi-time-domain real-time spectrograph |
| CN105527243A (en) * | 2015-11-30 | 2016-04-27 | 中国科学院重庆绿色智能技术研究院 | Method for measuring conductivity of graphene film based on terahertz time-domain spectroscopy |
| CN106792282A (en) * | 2015-11-24 | 2017-05-31 | 华为技术有限公司 | A kind of optical signal processing method and light skewing mechanism |
| CN109507147A (en) * | 2018-11-30 | 2019-03-22 | 深圳市华讯方舟太赫兹科技有限公司 | A kind of Terahertz detection device |
| CN109507146A (en) * | 2018-11-30 | 2019-03-22 | 深圳市华讯方舟太赫兹科技有限公司 | A kind of terahertz time-domain spectroscopy detection device |
| CN109540794A (en) * | 2018-11-07 | 2019-03-29 | 深圳大学 | Illumination apparatus |
| CN109708761A (en) * | 2019-01-10 | 2019-05-03 | 北京信息科技大学 | A kind of compact miniature Terahertz detection system |
| CN110768729A (en) * | 2019-11-05 | 2020-02-07 | 中国科学院紫金山天文台 | Medium-far infrared band grating and optical fiber coupling multi-beam coherent receiving system |
| WO2020134846A1 (en) * | 2018-12-27 | 2020-07-02 | 深圳市华讯方舟太赫兹科技有限公司 | Water vapor detection system based on terahertz and detection method |
| CN111855607A (en) * | 2020-08-12 | 2020-10-30 | 重庆邮电大学 | Terahertz spectrum system, vitamin D detection method, sample and sample preparation method |
| CN112229814A (en) * | 2019-07-15 | 2021-01-15 | 中国科学院福建物质结构研究所 | Terahertz spectrum measuring device, measuring method and application thereof |
| CN114268361A (en) * | 2021-12-20 | 2022-04-01 | 中国科学院微小卫星创新研究院 | Multi-input multi-output inter-satellite communication diversity system and method based on photo-generated terahertz |
| CN115479914A (en) * | 2022-08-15 | 2022-12-16 | 北京邮电大学 | High-resolution terahertz frequency domain scanning system and method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101196467A (en) * | 2006-12-05 | 2008-06-11 | 佳能株式会社 | Detection method using electromagnetic wave and detection apparatus |
| CN101435771A (en) * | 2008-07-15 | 2009-05-20 | 中国科学院上海应用物理研究所 | Efedrina for identifying different optical rotation performances by THz-TDS |
| CN102762973A (en) * | 2010-02-15 | 2012-10-31 | 皇家飞利浦电子股份有限公司 | Device for analyzing a sample using radiation in the terahertz frequency range |
| CN102929071A (en) * | 2012-11-19 | 2013-02-13 | 山东海富光子科技股份有限公司 | Single-frequency terahertz source generated by using single-frequency laser as nonlinear difference frequency |
| US20140061475A1 (en) * | 2012-08-29 | 2014-03-06 | Electronics And Telecommunications Research Institute | Apparatus and method for contactless thickness measurement |
-
2014
- 2014-12-05 CN CN201410742447.6A patent/CN104458645A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101196467A (en) * | 2006-12-05 | 2008-06-11 | 佳能株式会社 | Detection method using electromagnetic wave and detection apparatus |
| CN101435771A (en) * | 2008-07-15 | 2009-05-20 | 中国科学院上海应用物理研究所 | Efedrina for identifying different optical rotation performances by THz-TDS |
| CN102762973A (en) * | 2010-02-15 | 2012-10-31 | 皇家飞利浦电子股份有限公司 | Device for analyzing a sample using radiation in the terahertz frequency range |
| US20140061475A1 (en) * | 2012-08-29 | 2014-03-06 | Electronics And Telecommunications Research Institute | Apparatus and method for contactless thickness measurement |
| CN102929071A (en) * | 2012-11-19 | 2013-02-13 | 山东海富光子科技股份有限公司 | Single-frequency terahertz source generated by using single-frequency laser as nonlinear difference frequency |
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106792282A (en) * | 2015-11-24 | 2017-05-31 | 华为技术有限公司 | A kind of optical signal processing method and light skewing mechanism |
| US10405074B2 (en) | 2015-11-24 | 2019-09-03 | Huawei Technologies Co., Ltd. | Optical signal processing method and optical cross-connect apparatus |
| CN106792282B (en) * | 2015-11-24 | 2020-03-10 | 华为技术有限公司 | Optical signal processing method and optical cross device |
| CN105527243A (en) * | 2015-11-30 | 2016-04-27 | 中国科学院重庆绿色智能技术研究院 | Method for measuring conductivity of graphene film based on terahertz time-domain spectroscopy |
| CN105334182A (en) * | 2015-12-10 | 2016-02-17 | 中国科学院重庆绿色智能技术研究院 | All-fiber terahertz quasi-time-domain real-time spectrograph |
| CN109540794A (en) * | 2018-11-07 | 2019-03-29 | 深圳大学 | Illumination apparatus |
| CN109540794B (en) * | 2018-11-07 | 2024-07-19 | 深圳大学 | Lighting device |
| CN109507147A (en) * | 2018-11-30 | 2019-03-22 | 深圳市华讯方舟太赫兹科技有限公司 | A kind of Terahertz detection device |
| CN109507146A (en) * | 2018-11-30 | 2019-03-22 | 深圳市华讯方舟太赫兹科技有限公司 | A kind of terahertz time-domain spectroscopy detection device |
| WO2020134846A1 (en) * | 2018-12-27 | 2020-07-02 | 深圳市华讯方舟太赫兹科技有限公司 | Water vapor detection system based on terahertz and detection method |
| CN109708761A (en) * | 2019-01-10 | 2019-05-03 | 北京信息科技大学 | A kind of compact miniature Terahertz detection system |
| CN112229814A (en) * | 2019-07-15 | 2021-01-15 | 中国科学院福建物质结构研究所 | Terahertz spectrum measuring device, measuring method and application thereof |
| CN112229814B (en) * | 2019-07-15 | 2021-11-05 | 中国科学院福建物质结构研究所 | Terahertz spectrum measuring device, measuring method and application thereof |
| US11159246B2 (en) | 2019-11-05 | 2021-10-26 | Purple Mountain Observatory, Chinese Academy Of Sciences | Grating- and fiber-coupled multi-beam coherent receiving system in mid- and far-infrared band |
| CN110768729A (en) * | 2019-11-05 | 2020-02-07 | 中国科学院紫金山天文台 | Medium-far infrared band grating and optical fiber coupling multi-beam coherent receiving system |
| CN111855607A (en) * | 2020-08-12 | 2020-10-30 | 重庆邮电大学 | Terahertz spectrum system, vitamin D detection method, sample and sample preparation method |
| CN114268361A (en) * | 2021-12-20 | 2022-04-01 | 中国科学院微小卫星创新研究院 | Multi-input multi-output inter-satellite communication diversity system and method based on photo-generated terahertz |
| CN114268361B (en) * | 2021-12-20 | 2023-09-26 | 中国科学院微小卫星创新研究院 | Multiple-input multiple-output inter-satellite communication diversity system and method based on photogenerated terahertz |
| CN115479914A (en) * | 2022-08-15 | 2022-12-16 | 北京邮电大学 | High-resolution terahertz frequency domain scanning system and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104458645A (en) | Method and system for realizing continuous terahertz spectrum detection | |
| US20200271515A1 (en) | Terahertz spectroscopy system and method | |
| CN106441580B (en) | The incident terahertz time-domain spectroscopy instrument for surveying transmission and reflection simultaneously of variable-angle | |
| CN101210874B (en) | Method and apparatus for measuring terahertz time-domain spectroscopy | |
| CN2874476Y (en) | Terahertz time domain spectral instrument based on optical rectification | |
| CN201662531U (en) | Small-sized Terahertz time-domain spectrograph | |
| CN105784634A (en) | Terahertz time domain spectrograph capable of measuring transmission and reflection simultaneously under vertical incidence | |
| CN101701852B (en) | Electro-optic sampling device used for measuring terahertz optical pulse and measuring method thereof | |
| CN105628642A (en) | Method for improving frequency spectrum signal-to-noise ratio of tera-hertz optical detection system | |
| CN104833650A (en) | Pulse terahertz time-domain spectral system with single photoconductive antenna and detection method thereof | |
| CN105866061B (en) | The anticoincidence pulse detection device and anticoincidence pulse detection method of THz wave time-domain information | |
| CN104655185B (en) | Coherent Brillouin optical time domain analysis sensing system based on intensity modulation probe light | |
| CN105548083A (en) | Double-optical-path terahertz time-domain spectrometer | |
| CN105738315A (en) | Terahertz device for real-time monitoring of biomolecule composition and content and measuring method thereof | |
| CN200996980Y (en) | Equipment for measuring terahertz time-domain spectrum | |
| CN105823755A (en) | Self-mixing gas absorption sensing system based on tunable semiconductor laser | |
| CN205843813U (en) | A kind of device of all-fiber formula time domain short scan tera-hertz spectra based on fiber stretcher | |
| CN108287132A (en) | A kind of Terahertz asynchronous high-speed scanning system trigger signal generation device and method | |
| CN105181155A (en) | Terahertz pulse single-time detection system and detection method based on single-mode fiber | |
| AU2011200753A1 (en) | System and method for magnitude and phase retrieval by path modulation | |
| CN107064049A (en) | A kind of Optical devices and discrimination method for being used to differentiate organic components and content | |
| CN211927689U (en) | Spectrum detection device | |
| KR101740020B1 (en) | Degradation assessment system of insulating oils using terahertz time-domain spectroscopy | |
| CN208076389U (en) | A kind of terahertz light spectrometer | |
| CN208076388U (en) | A kind of Terahertz detection device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150325 |
|
| RJ01 | Rejection of invention patent application after publication |