CN104677497B - Detection device and method for properties of terahertz waves - Google Patents
Detection device and method for properties of terahertz waves Download PDFInfo
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- CN104677497B CN104677497B CN201510077425.7A CN201510077425A CN104677497B CN 104677497 B CN104677497 B CN 104677497B CN 201510077425 A CN201510077425 A CN 201510077425A CN 104677497 B CN104677497 B CN 104677497B
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Abstract
The invention relates to a detection device and method for properties of terahertz waves. The method comprises the following steps: an eigen germanium material panel with tunable reflection space terahertz wave effects, a parabolic reflector, a two-dimensional scan vibration mirror and two one-dimensional direct-current motors are used, the eigen germanium material panel is fixed in a transmitting path of a terahertz collimated light beam, the two-dimensional scan vibration mirror is regulated so that the light beam after beam shrinkage scans different space positions of eigen germanium materials, regions needing detection are reflected, besides, an electro-optical crystal is used for detecting the time domain spectrum of the terahertz light beam, and finally through later-stage spectrum analysis and treatment, the data extraction of the internal electric field range, the frequency and the phase of different regions of the terahertz light beam can be realized. The method disclosed by the invention can be used for solving the scientific difficult problem for detection of source characteristics internationally, can establish basis for later-stage scientific research work, can help users to use different characteristic selecting means according to different sources in practical application, and can improve the application efficiency of the terahertz waves.
Description
Technical field
The present invention relates to a kind of Electromagnetic Wave Detection technology, particularly to a kind of THz wave two dimensional electric field amplitude and the detection apparatus and method of frequency and PHASE DISTRIBUTION.
Background technology
After the eighties Terahertz in last century (THz) is formally recognized by the mankind, along with the development of ultrafast technology so that the pulse THz source obtaining broadband stable becomes a kind of quasi-routine techniques, and THz technology is developed rapidly.Terahertz emission is the frequency electromagnetic wave in 0.1 to 10 THz scopes, this wave band microwave and infrared between, its special performance brings far-reaching influence to field such as communication (broadband connections), radar, electronic countermeasure, ELECTROMAGNETIC WEAPON, astronomy, medical imaging (unmarked genetic test, the imaging of cellular level), Non-Destructive Testing, safety inspection (inspection of biological) etc..Owing to the frequency of Terahertz is the highest, so its spatial resolution is the highest；Again owing to its pulse the shortest (picosecond magnitude) is so having the highest temporal resolution.Additionally, THz has characteristics such as carrying informative, high temporal and spatial coherence, low photon energy, there is huge using value in the scientific domain such as astronomy, biology, computer, communication.Therefore the detection for information entrained in terahertz time-domain spectroscopy is just particularly important.And at present for device and the corresponding method of characteristic also these parameters of neither one energy synchro measure such as the energy on THz wave two dimensional surface, frequency, PHASE DISTRIBUTION.
Summary of the invention
The problem that the present invention be directed to lack the method and device that can the most simultaneously detect THz wave two dimensional electric field amplitude and frequency and PHASE DISTRIBUTION at present, propose the detection apparatus and method of a kind of THz wave performance, have employed the intrinsic germanium material flat board with tunable reflection space THz wave effect, paraboloidal mirror, two-dimensional scanning mirrors and two one-dimensional direct current generators, intrinsic germanium material flat board is fixed in the path of Terahertz collimated beam transmission, by regulation two-dimensional scanning mirrors, make the different spatial of the scanning intrinsic germanium material of the light beam after contracting bundle, reflection needs the region of detection, simultaneously with the time-domain spectroscopy of electro-optic crystal detection thz beam, process finally by later stage spectrum analysis, thz beam zones of different internal electric field amplitude can be realized, the data of frequency and phase place are extracted.
The technical scheme is that the detection device of a kind of THz wave performance, including two beam splitting chips；Three reflecting mirrors；THz source；Paraboloidal mirror A；Planar metal mirror；Intrinsic germanium；Two convex lenss；Concavees lens；Two-dimensional scanning mirrors；Paraboloidal mirror B；ZnTe crystal；/ 4th slides；Wollaston prism；PD pops one's head in；The primary laser pulse exported by femto-second laser, after the first beam splitting chip, reflection light enters THz source as light beam one through the first reflecting mirror, THz source output produces THz wave, after off axis paraboloidal mirror A, produce the thz beam of a collimation, through fixed intrinsic germanium flat board after being reflected by planar metal mirror；
By the transmission light of the first beam splitting chip through the second beam splitting chip, second beam splitting chip output reflection light as light beam two after the second reflecting mirror secondary reflection again, after the contracting bundle of the first convex lens and concavees lens, by regulation two-dimensional scanning mirrors, change light exit direction, be irradiated to the diverse location on intrinsic germanium flat board, form the surface of metalloid, reflected terahertz hereby light, the position THz wave not being irradiated to still is transmitted, the THz wave parallel entrance paraboloidal mirror B passed through；
By the transmission light of the first beam splitting chip through the second beam splitting chip, the transmission light of the second beam splitting chip output is as light beam three, reflect through the 3rd reflecting mirror, combiner is converged with paraboloidal mirror B, pass sequentially through electro-optic crystal, convex lens, 1/4th slides, wollaston prism again, enter PD probe and carry out the opto-electronic conversion of signal, follow-up carry out signal record and process.
Described device also includes two groups of delay systems, and delay system is made up of two illuminators and one-dimensional direct current generator, is placed in the light path of light beam two and light beam three, regulates light path light path.
Described THz source is selected ultra-short pulse laser to focus on formation plasma wire drawing in atmosphere thus is produced THz wave, or focus on ultrashort laser and excite carrier high-speed motion on photoconductive antenna thus produce THz wave, or i.e. produce THz wave with ultra-short pulse laser and the interaction of nonlinear dielectric with light method for rectifying.
Described electro-optic crystal is from ZnTe, GaP, GaAs, ZnCdTe, HgCdTe, LiNbO3In choose any one kind of them.
The THz wave method for testing performance of described device, specifically includes following steps
1) when gathering initial background signal, light beam two is first blocked, with detection light beam recording through the complete terahertz wave signal after intrinsic germanium flat board；
2) when light beam two is irradiated on intrinsic germanium flat board, irradiated regional reflex THz ripple, remaining THz ripple is through entering detection system after intrinsic germanium flat board；Complete terahertz wave signal and part are subtracted each other by the terahertz wave signal after reflecting the relevant Terahertz characteristic information that i.e. can get irradiated area；
3) controlling light beam two by 2-D vibration mirror regulation and be radiated at the diverse location on intrinsic germanium flat board, in conjunction with later stage spectrum analysis process and 2-D data recombinant, the data that can realize thz beam zones of different internal electric field amplitude, frequency and phase place are extracted.
The beneficial effects of the present invention is: the detection apparatus and method of THz wave performance of the present invention, the THz source distribution of energy, frequency, phase place on space plane that can be produced with synchronously tested different principle by new equipment and the new detection method of design, one, the sciences problems in the world to source feature detection can be solved, scientific research for the later stage lays the foundation, two, may help to user in actual applications and use different Feature Selection means for different sources, improve the application efficiency of THz wave.
Accompanying drawing explanation
Fig. 1 is the structure of the detecting device schematic diagram of THz wave performance of the present invention.
Detailed description of the invention:
Detect the apparatus structure schematic diagram of THz wave performance as shown in Figure 1, including: beam splitting chip 1；Reflecting mirror 2；THz source 3；Paraboloidal mirror A4；Planar metal mirror 5；Intrinsic germanium 6；Beam splitting chip 7；Reflecting mirror 8；Convex lens 9；Concavees lens 10；Reflecting mirror 11；One-dimensional direct current generator 12；Reflecting mirror 13；Two-dimensional scanning mirrors 14；Reflecting mirror 15；One-dimensional direct current generator 16；Reflecting mirror 17；Reflecting mirror 18；Paraboloidal mirror B19；ZnTe crystal 20；Convex lens 21；/ 4th slides 22；Wollaston prism 23；PD probe 24.The primary laser pulse exported by femto-second laser, after beam splitting chip 1, reflection light enters THz source 3 as light beam one through reflecting mirror 2.THz source 3 output produces THz wave, after off axis paraboloidal mirror A4, produces the thz beam of a collimation, through fixed intrinsic germanium flat board 6 after being reflected by planar metal mirror 5.By the transmission light of beam splitting chip 1 through beam splitting chip 7, beam splitting chip 7 output reflection light as light beam two after reflecting mirror 8 secondary reflection again, after the contracting bundle of convex lens 9 and concavees lens 10, by regulation two-dimensional scanning mirrors 14, change light exit direction, it is irradiated to the diverse location on intrinsic germanium flat board 6, at institute's irradiation area, the reflectance of intrinsic germanium 6 is greatly improved, form the surface of metalloid, reflected terahertz hereby light, and other positions of flat board are not irradiated by light beam, the THz wave in these regions that falls still is transmitted, the THz wave passed through is by parallel entrance paraboloidal mirror B19.By the transmission light of beam splitting chip 1 through beam splitting chip 7, the transmission light of beam splitting chip 7 output is as light beam three, reflect through reflecting mirror 18, combiner is converged with paraboloidal mirror B19, pass sequentially through electro-optic crystal 20, convex lens 21,1/4th slide 22, wollaston prism 23 again, enter the opto-electronic conversion that PD probe 24 carries out signal, follow-up carry out signal record and process.Thus detect the time-domain spectroscopy of thz beam, and processing finally by later stage spectrum analysis, the data that can realize thz beam zones of different internal electric field amplitude, frequency and phase place are extracted.
Reflecting mirror 11, one-dimensional direct current generator 12, reflecting mirror 13 form delay system, are placed in light beam three light path, play the effect of regulation detection light path light path.
Reflecting mirror 15, one-dimensional direct current generator 16, reflecting mirror 17 form delay system, are placed in light beam two light path, play regulation and control the effect of light path light path.
In the following embodiments, as a example by exporting the laser instrument that center wavelength of light is 800 nm, its all band is consistent with the implementation of this wave band.
Laser instrument output center wavelength of light is 800 nm, and spectral region 780-820 nm, pulse width is 30 fs, repetition rate 1 KHz.400 are obtained with BBO frequency-doubling crystal
As a example by the frequency doubled light of nm.Said method utilizes intrinsic germanium flat board detection Terahertz two dimensional surface electric field amplitude frequency and PHASE DISTRIBUTION, the regulation process being embodied as selecting is as follows: by the primary laser pulse of femto-second laser output 800nm, by beam splitting chip 1 (1:1), reflection light beam forms light beam one (pumping pulse), transmitted light beam forms light beam two (control pulse) through the reflection light beam of beam splitting chip 7 again, and the transmitted light beam of beam splitting chip 7 forms light beam three (direct impulse).Light beam one produces THz wave through THz source 3, after off axis paraboloidal mirror A4, produces the thz beam of a collimation, through fixed intrinsic germanium flat board 6 after being reflected by planar metal reflecting mirror 5.Light beam two (control pulse) is after the contracting bundle of convex lens 9 and concavees lens 10, by regulation two-dimensional scanning mirrors, change light exit direction, allow and control pulse all with the oblique different spatial being mapped to scan intrinsic germanium flat board 6 of Brewster's angle, at institute's irradiation area, the reflectance of intrinsic germanium 6 is greatly improved, and forms the surface of metalloid, reflected terahertz hereby light, and other positions of flat board are not irradiated by light beam, the THz wave in these regions that falls still is transmitted.These THz waves passed through by parallel entrance paraboloidal mirror B19 and detect combiner with three beams simultaneously, by ZnTe crystal 20, convex lens 21,1/4th slide 22, wollaston prism 23, enter PD detector, thus detect the time-domain spectroscopy of thz beam.
When gathering initial background signal, first block light beam two (control pulse), with detection light beam recording through the complete terahertz wave signal after intrinsic germanium flat board 6.When light beam two (control pulse) is irradiated on intrinsic germanium flat board 6, irradiated regional reflex THz ripple, remaining THz ripple is through entering detection system after intrinsic germanium flat board 6.Complete terahertz wave signal and part are subtracted each other by the terahertz wave signal after reflecting the relevant Terahertz characteristic information that i.e. can get irradiated area.Controlling light beam two by 2-D vibration mirror regulation and be radiated at the diverse location on intrinsic germanium flat board 6, in conjunction with later stage spectrum analysis process and 2-D data recombinant, the data that can realize thz beam zones of different internal electric field amplitude, frequency and phase place are extracted.
Described THz source 3 can be selected for ultra-short pulse laser focusing formation plasma wire drawing in atmosphere thus produces THz wave, or focus on ultrashort laser and excite carrier high-speed motion on photoconductive antenna thus produce THz wave, or i.e. produce THz wave with ultra-short pulse laser and the interaction of nonlinear dielectric with light method for rectifying.
Described electro-optic crystal 20 can be from ZnTe, GaP, GaAs, ZnCdTe, HgCdTe, LiNbO3In choose any one kind of them.
Claims (5)
1. the detection device of a THz wave performance, it is characterised in that include two beam splitting chips；Three reflecting mirrors；THz source；Paraboloidal mirror A；Planar metal mirror；Intrinsic germanium；Two convex lenss；Concavees lens；Two-dimensional scanning mirrors；Paraboloidal mirror B；Electro-optic crystal；/ 4th slides；Wollaston prism；PD pops one's head in；The primary laser pulse exported by femto-second laser, after the first beam splitting chip, reflection light enters THz source as light beam one through the first reflecting mirror, THz source output produces THz wave, after off axis paraboloidal mirror A, produce the thz beam of a collimation, through fixed intrinsic germanium flat board after being reflected by planar metal mirror；
By the transmission light of the first beam splitting chip through the second beam splitting chip, second beam splitting chip output reflection light as light beam two after the second reflecting mirror secondary reflection again, after the contracting bundle of the first convex lens and concavees lens, by regulation two-dimensional scanning mirrors, change light exit direction, be irradiated to the diverse location on intrinsic germanium flat board, form the surface of metalloid, reflected terahertz hereby light, the position THz wave not being irradiated to still is transmitted, the THz wave parallel entrance paraboloidal mirror B passed through；
By the transmission light of the first beam splitting chip through the second beam splitting chip, the transmission light of the second beam splitting chip output is as light beam three, reflect through the 3rd reflecting mirror, combiner is converged with paraboloidal mirror B, pass sequentially through electro-optic crystal, convex lens, 1/4th slides, wollaston prism again, enter PD probe and carry out the opto-electronic conversion of signal, follow-up carry out signal record and process.
The detection device of THz wave performance the most according to claim 1, it is characterized in that, described device also includes two groups of delay systems, and delay system is made up of two illuminators and one-dimensional direct current generator, it is placed in the light path of light beam two and light beam three, regulates light path light path.
The detection device of THz wave performance the most according to claim 1 or claim 2, it is characterized in that, described THz source is selected ultra-short pulse laser to focus on formation plasma wire drawing in atmosphere thus is produced THz wave, or focus on ultrashort laser and excite carrier high-speed motion on photoconductive antenna thus produce THz wave, or i.e. produce THz wave with ultra-short pulse laser and the interaction of nonlinear dielectric with light method for rectifying.
The detection device of THz wave performance the most according to claim 1 or claim 2, it is characterised in that described electro-optic crystal is from ZnTe, GaP, GaAs, ZnCdTe, HgCdTe, LiNbO3In choose any one kind of them.
5. according to the THz wave method for testing performance of device described in Claims 1-4 any one, it is characterised in that specifically include following steps
1) when gathering initial background signal, light beam two is first blocked, with detection light beam recording through the complete terahertz wave signal after intrinsic germanium flat board；
2) when light beam two is irradiated on intrinsic germanium flat board, irradiated regional reflex THz wave, remaining THz wave is through entering detection system after intrinsic germanium flat board；Complete terahertz wave signal and part are subtracted each other by the terahertz wave signal after reflecting the relevant Terahertz characteristic information that i.e. can get irradiated area；
3) controlling light beam two by 2-D vibration mirror regulation and be radiated at the diverse location on intrinsic germanium flat board, in conjunction with later stage spectrum analysis process and 2-D data recombinant, the data that can realize thz beam zones of different internal electric field amplitude, frequency and phase place are extracted.
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| CN105628642A (en) * | 2016-01-08 | 2016-06-01 | 上海理工大学 | Method for improving frequency spectrum signal-to-noise ratio of tera-hertz optical detection system |
| CN107015414A (en) * | 2016-01-28 | 2017-08-04 | 首都师范大学 | A kind of system and method for changing terahertz polarization state |
| CN105928624B (en) * | 2016-04-18 | 2018-10-12 | 上海理工大学 | Enhance the device and method of terahertz wave signal based on hollow metal waveguide fiber |
| CN106442379B (en) * | 2016-10-09 | 2018-11-13 | 上海理工大学 | The device backwards to laser far-distance detection dangerous goods based on THz wave |
| CN108321663B (en) * | 2018-02-11 | 2019-10-01 | 成都清大华科微晶材料有限责任公司 | A kind of continuous terahertz emission source of wideband and corresponding exciting method |
| CN108981915A (en) * | 2018-06-05 | 2018-12-11 | 北京航空航天大学 | High field Terahertz spin transmitter and spectrometer |
| CN109001836B (en) * | 2018-09-03 | 2019-10-15 | 苏州耶拿微电子有限公司 | Terahertz human body security check system |
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| CN101782432A (en) * | 2010-03-16 | 2010-07-21 | 中国科学院苏州纳米技术与纳米仿生研究所 | Universal photoelectric test system for tera-hertz spectra |
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| CN2874476Y (en) * | 2006-02-10 | 2007-02-28 | 天津大学 | Terahertz time domain spectral instrument based on optical rectification |
| CN101782432A (en) * | 2010-03-16 | 2010-07-21 | 中国科学院苏州纳米技术与纳米仿生研究所 | Universal photoelectric test system for tera-hertz spectra |
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