CN201662531U - Small Terahertz Time-Domain Spectrometer - Google Patents
Small Terahertz Time-Domain Spectrometer Download PDFInfo
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- CN201662531U CN201662531U CN201020046905XU CN201020046905U CN201662531U CN 201662531 U CN201662531 U CN 201662531U CN 201020046905X U CN201020046905X U CN 201020046905XU CN 201020046905 U CN201020046905 U CN 201020046905U CN 201662531 U CN201662531 U CN 201662531U
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Abstract
本实用新型公开了一种小型太赫兹时域光谱仪，其特点为：它包括飞秒脉冲光纤激光器，设置在飞秒脉冲光纤激光器输出端的1/2波片与偏振分束器，偏振分束器将一束激光分为2束；一束为泵浦光，另一束为探测光；泵浦光经泵浦光路汇聚到基于光导天线的太赫兹发射器上，利用光导天线辐射太赫兹波；产生的太赫兹辐射波再经透射测量模块或反射测量模块后，将太赫兹辐射波聚集于太赫兹探测器；产生的太赫兹辐射波与探测光束共线耦合到太赫兹探测器上，利用电光效应，对太赫兹波的时域电场进行电光采样，送入数据采集及处理系统进行光电信号转换和处理；具有体积小、密封、方便移动；光谱仪时域分辨精度高，测量速率快，保证测量精度的特点，易于推广应用。
The utility model discloses a small terahertz time-domain spectrometer, which is characterized in that it includes a femtosecond pulse fiber laser, a 1/2 wave plate and a polarization beam splitter arranged at the output end of the femtosecond pulse fiber laser, and a polarization beam splitter Divide a beam of laser light into two beams; one beam is the pump light, and the other beam is the probe light; the pump light is converged to the terahertz transmitter based on the photoconductive antenna through the pump light path, and the terahertz wave is radiated by the photoconductive antenna; After the generated terahertz radiation wave passes through the transmission measurement module or reflection measurement module, the terahertz radiation wave is concentrated on the terahertz detector; the generated terahertz radiation wave and the detection beam are collinearly coupled to the terahertz detector, and the electro-optic Effect, electro-optic sampling is performed on the time-domain electric field of terahertz waves, and sent to the data acquisition and processing system for photoelectric signal conversion and processing; it is small in size, sealed, and easy to move; the spectrometer has high time-domain resolution accuracy and fast measurement speed, ensuring measurement The characteristics of precision are easy to popularize and apply.
Description
Technical field
The utility model relates to a kind of terahertz time-domain spectroscopy instrument, and particularly a kind of volume is little, is easy to move, portable small-sized terahertz time-domain spectroscopy instrument.
Background technology
The Terahertz frequency range is meant the electromagnetic radiation zone of frequency from 0.1THz to 10THz.Terahertz emission has great scientific value and wide application prospect because it has unique character such as transient state, low energy and coherence at aspects such as satellite communication, Non-Destructive Testing, military radars.The terahertz light spectral technology is a key areas of terahertz emission Practical Research, this technology has the very high detection signal to noise ratio (S/N ratio) and the detective bandwidth of broad, can be widely used in the detection of material property spectrum, especially the spectral investigation for drugs and explosive has very actual application prospect.
The main in the world at present terahertz time-domain spectroscopy instrument that adopts, substantially be divided into two kinds of mode of operations of branch transmission-type and reflection-type, separate separately, and major part also is confined to the application in the laboratory, the single spectrum Measuring Time is long, can not satisfy the needs of practical application; Simultaneously also can be subjected to environmental limit in use.
The utility model content
In order to solve the defective that exists in the above-mentioned prior art, the purpose of this utility model is to provide a kind of volume little, be easy to move, only need slightly the measurement module of spectrometer is re-assemblied, just can realize the transmission tera-hertz spectra of measurement of species or the reflected terahertz small-sized terahertz time-domain spectroscopy instrument of spectrum now.
To achieve these goals, the utility model adopts following technical scheme: a kind of small-sized terahertz time-domain spectroscopy instrument, comprise femtosecond pulse laser, and be arranged on the beam splitter of femtosecond pulse laser output terminal, beam splitter is divided into 2 bundles with beam of laser; A branch of is pump light, and another bundle is for surveying light; Pump light converges on the terahertz transmitter through the pumping light path, the terahertz emission ripple and the detecting light beam through surveying light path that are produced by terahertz transmitter are coupled on the terahertz detector by conllinear, the optical signalling that terahertz detector obtains sends into data acquisition and disposal system is carried out the photosignal conversion, obtains the optical parametric of measured matter; Its characteristics are: above-mentioned femtosecond pulse laser adopts the femtosecond pulse fiber laser, and above-mentioned beam splitter adopts polarization beam apparatus; Between femtosecond pulse fiber laser and polarization beam apparatus, be provided with one 1/2 wave plates; Above-mentioned terahertz transmitter adopts the terahertz transmitter based on the photoconduction antenna, utilizes photoconduction aerial radiation THz wave; Based on the terahertz transmitter of photoconduction antenna to a transmission measurement module is housed between the terahertz detector, the terahertz emission ripple behind above-mentioned transmission measurement module and silicon chip, converges on the above-mentioned terahertz detector successively.
Above-mentioned transmission measurement module is formed by 2 gold-plated off axis paraboloidal mirrors and 2 Terahertz combination of lensess of being fixed on the optical backplane; 2 gold-plated off axis paraboloidal mirror branches are located at 2 ends of this transmission measurement module, inner bevel setting each other; Between 2 gold-plated off axis paraboloidal mirrors, be inserted with 2 Terahertz lens of surface level each other; Wherein, gold-plated off axis paraboloidal mirror is provided with respect to the 153mm place that is positioned at after the terahertz transmitter; The gold-plated off axis paraboloidal mirror of another piece is with respect to above-mentioned terahertz detector setting; 2 each gold-plated off axis paraboloidal mirror 50mm places apart from its outside of Terahertz lens are provided with; Spacing between 2 Terahertz lens leaves 100mm.
To achieve these goals, second kind of technical scheme of the utility model employing: be that the transmission measurement module in the technique scheme is changed to the reflection measurement module; Concrete technical scheme is as follows: a kind of small-sized terahertz time-domain spectroscopy instrument, comprise femtosecond pulse laser, and be arranged on the beam splitter of femtosecond pulse laser output terminal, beam splitter is divided into 2 bundles with beam of laser; A branch of is pump light, and another bundle is for surveying light; Pump light converges on the terahertz transmitter through the pumping light path, the terahertz emission ripple and the detecting light beam through surveying light path that are produced by terahertz transmitter are coupled on the terahertz detector by conllinear, the optical signalling that terahertz detector obtains sends into data acquisition and disposal system is carried out the photosignal conversion, obtains the optical parametric of measured matter; Its characteristics are: above-mentioned femtosecond pulse laser adopts the femtosecond pulse fiber laser, and above-mentioned beam splitter adopts polarization beam apparatus; Between femtosecond pulse fiber laser and polarization beam apparatus, be provided with one 1/2 wave plates; Above-mentioned terahertz transmitter adopts the terahertz transmitter based on the photoconduction antenna, utilizes photoconduction aerial radiation THz wave; Based on the terahertz transmitter of photoconduction antenna to a reflection measurement module is housed between the terahertz detector, the terahertz emission ripple behind above-mentioned reflection measurement module and silicon chip, converges on the above-mentioned terahertz detector successively.
Above-mentioned reflection measurement module by be fixed on 2 gold-plated off axis paraboloidal mirrors on the optical backplane, place on the transmission mirror holder 2 Terahertz lens with place 3 plane mirrors of aluminizing on the reflector mount to combine; 2 gold-plated off axis paraboloidal mirror branches are located at 2 ends of this transmission measurement module, inner bevel setting each other; Between 2 gold-plated off axis paraboloidal mirrors, be inserted with 2 Terahertz lens of surface level each other; 3 plane mirrors of aluminizing are loaded between 2 Terahertz lens; Wherein, gold-plated off axis paraboloidal mirror is provided with respect to the 153mm place that is positioned at after the terahertz transmitter; The gold-plated off axis paraboloidal mirror of another piece is with respect to above-mentioned terahertz detector setting; 2 each gold-plated off axis paraboloidal mirror 50mm places apart from its outside of Terahertz lens are provided with; Spacing between 2 Terahertz lens leaves 100mm.
2 middle parts of plane mirror between above-mentioned 2 Terahertz lens of aluminizing in 3 plane mirrors of aluminizing, 2 plane mirror one ends of aluminizing intersect, and the other end is opening-like, and 2 crossing angles of aluminizing between the plane mirror are 120 degree; Another piece is aluminized plane mirror apart from the vertical setting in the 25mm place, the outside that above-mentioned 2 plane mirrors of aluminizing intersect an end, leaves the position of putting measuring samples in this inboard of aluminizing plane mirror and 2 crossing ends of plane mirror of aluminizing.
In two kinds of above-mentioned technical schemes, described pumping light path, detection light path are the same with data acquisition and disposal system.
The above-mentioned pump light route polarization beam apparatus beginning, be disposed with plane mirror, fast optical delayed sweep device and quartzy plano-convex lens;
The above-mentioned detection optical routing polarization beam apparatus beginning, be disposed with 4 plane mirrors, 1 quartzy plano-convex lens, plane mirror, polaroid and silicon chip.
Above-mentioned data acquisition and disposal system are disposed with quarter wave plate by input end, quartzy plano-convex lens, Wollaston prism, differential detector, lock-in amplifier and computing machine.
Above-mentioned differential detector is composed in series by two photodiodes; Its input end receives the orthogonal light intensity signal in two bundle polarization directions by Wollaston prism output, shines respectively on two photodiodes, and photodiode then is converted into electric signal to light intensity signal; Electric signal inputs to by a coaxial wire on the differential input end mouth of lock-in amplifier, and electric signal inputs to computing machine and carries out data processing after lock-in amplifier amplifies.
Owing to adopted as above technical scheme, the beneficial effects of the utility model are as follows: 1, adopt femto second optical fiber laser as driving source, replace heavy in the past, expensive large-scale laser, make system dimension greatly be reduced, improved the integration of system, be convenient to move, cooperate other utility appliance to make this spectrometer can break away from the laboratory, be implemented in the purpose of carrying out work under the complex environment more.2, modular design can realize the needs according to Measuring Object, realizes Measuring Object transmission terahertz time-domain electric field signal or reflected terahertz time domain electric field signal now easily; And need not system be made any change, can obtain than the more terahertz light spectrum information of other spectrometers, be convenient to structure of matter character is made analysis more accurately.3, adopt quick scanning optical deferred mount, will scan the time of single spectrum in 4 minutes in the past, shorten to 0.1 second one; Spectral measurement speed can reach 10Hz, has promoted spectral scan efficient greatly, and spectrum time domain resolution can reach 0.034ps simultaneously, makes system practical more.4, adopt photoconduction antenna terahertz transmitter radiation Terahertz, make Terahertz intensity reach 400nA, spectrum width reaches 2.6THz, and the THz wave performance gets a promotion.5, install outer cover additional in total system of the present utility model, leave air intake opening, but the entire system inflated with nitrogen, thus can avoid the absorption of water in air to Terahertz, improve measuring accuracy.
Description of drawings
Fig. 1 is the inner structure schematic block diagram of the utility model small light spectrometer example 1
Fig. 2 is the inner structure schematic block diagram of the utility model small light spectrometer example 2
Fig. 3 is the package assembly synoptic diagram of transmission measurement module
Fig. 4 is the package assembly synoptic diagram of reflection measurement module
Embodiment
Below by example and accompanying drawing the technical solution of the utility model is described in further detail.
Example 1:
As shown in Figure 1, small-sized terahertz time-domain spectroscopy instrument of the present utility model is by femtosecond pulse fiber laser 1,1/2 wave plate 2, polarization beam apparatus 3, the pumping light path, survey light path, based on the terahertz transmitter 7 of photoconduction antenna, transmission measurement module 8, polaroid 15, silicon chip 16, terahertz detector 17, data acquisition and disposal system 18 assemble.
Send light source by femtosecond pulse fiber laser 1, the femtosecond light pulse of output, its repetition frequency is 75MHz, pulse width 119 femtoseconds, wavelength 800nm, output power 120mW.This femtosecond light pulse enters polarization beam apparatus 3 through 1/2 wave plate 2, and femtosecond light is divided into two bundles through polarization beam apparatus 3: a branch of light is pump light, accounts for 80% of laser output power, and another bundle accounts for 20% of laser output power for surveying light; Pump light converges on the terahertz transmitter 7 based on the photoconduction antenna after passing through the pumping light path that is made of plane mirror 4, fast optical delayed sweep device 5, quartzy plano-convex lens 6, utilizes photoconduction aerial radiation THz wave; The terahertz emission ripple that produces enters transmission measurement module 8, and final terahertz emission ripple focuses on the terahertz detector 17;
Survey the detecting light beam that light forms through the detection light path that is made of plane mirror 9,10,11,12, quartzy plano-convex lens 13, plane mirror 14, polaroid 15 and silicon chip 16;
Detecting light beam and terahertz emission ripple conllinear are coupled on the terahertz detector 17, utilize photoelectric effect that the time domain electric field of THz wave is carried out electro optic sampling, the terahertz time-domain signal that detects inputs to data acquisition by terahertz detector 17 and disposal system 18 is carried out the photosignal conversion, carries out data processing simultaneously to obtain the various optical parametrics of measured matter.
Used data acquisition and disposal system 18 are disposed with quarter wave plate 18-1 by input end, quartzy plano-convex lens 18-2, Wollaston prism 18-3, differential detector 18-4, lock-in amplifier 18-5 and computing machine 18-6.
The femto second optical fiber laser 1 that is adopted in the above-mentioned example is selected for use by IMRA (U.S. Yin Meirui company) and is produced, and model is the F-100 femto second optical fiber laser; 1/2 wave plate 2 is selected for use by Newport (U.S. Advanced LCD Technologies Dev Co Ltd) and is produced, and model is 1/2 wave plate of 10RP52-2; Polarization beam apparatus 3 is selected for use by Newport (U.S. Advanced LCD Technologies Dev Co Ltd) and is produced, and model is the polarization beam apparatus of 05FC16PB.5; Constitute the used plane mirror 4 of pumping light path and select for use by Daheng Xinshijiyuan Science ﹠ Technology Co., Ltd. and produce, model is the product of GCC-101112; Fast optical delayed sweep device 5 is selected for use by APE (U.S. APE company) and is produced, and model is the fast optical delayed sweep device of ScanDelay 15/50; Quartzy plano-convex lens 6 is selected for use by Daheng Xinshijiyuan Science ﹠ Technology Co., Ltd. and is produced, and model is the product of GCL-010810; Select for use by Zomega (U.S. Zuo Mijia company) based on the terahertz transmitter 7 of photoconduction antenna and to produce, model is the terahertz transmitter of LT-GaAs.
Terahertz detector 17 is selected for use by Zomega (U.S. Zuo Mijia company) and is produced, and model is the terahertz detector of ZnTe; Constitute to survey the used silicon chip 16 of light path and select for use by Zomega (U.S. Zuo Mijia company) and produce, model is a Silicon Lens silicon chip; Polaroid 15 is selected for use by Newport (U.S. Advanced LCD Technologies Dev Co Ltd) and is produced, and model is the 05P109AR.16 polaroid; Plane mirror 14,12,11,10,9 is selected for use by Daheng Xinshijiyuan Science ﹠ Technology Co., Ltd. and is produced, and model is the GCC-101112 plane mirror; Quartzy plano-convex lens 13 is selected for use by Daheng Xinshijiyuan Science ﹠ Technology Co., Ltd. and is produced, and model is the quartzy plano-convex lens of GCL-010810.
Used quarter wave plate 18-1 selects for use by Newport (U.S. Advanced LCD Technologies Dev Co Ltd) and produces in data acquisition and the disposal system 18, and model is the quarter wave plate of 10RP54-2; Quartzy plano-convex lens 18-2 selects for use by Daheng Xinshijiyuan Science ﹠ Technology Co., Ltd. and produces, and model is the quartzy plano-convex lens of GCL-010810; Wollaston prism 18-3 selects for use by Newport (U.S. Advanced LCD Technologies Dev Co Ltd) and produces, and model is the Wollaston prism of WP10; Lock-in amplifier 18-5 selects for use by Stanford (U.S. Stamford company) and produces, and model is the SR830 lock-in amplifier; Computing machine 18-6 selects for use by Dell Computer and makes, and model is an XPS M1210 computing machine; Used differential detector 18-4 is designed voluntarily by the present inventor and assembles, and is provided with the photodiode of two series connection in this differential detector 18-4; Its input end receives the orthogonal light intensity signal in two bundle polarization directions by Wollaston prism 18-3 output, shines respectively on two photodiodes, and photodiode then is converted into electric signal to light intensity signal; Electric signal inputs to by a coaxial wire on the differential input end mouth of lock-in amplifier 18-5, inputs to after signal amplifies and carries out data processing in the computing machine 18-6.
As shown in Figure 3, example 1 used transmission measurement module 8 is combined by 2 gold-plated off axis paraboloidal mirror 8-1,8-4 and 2 Terahertz lens 8-2,8-3 of being fixed on the optical backplane; Wherein, 2 gold-plated off axis paraboloidal mirror 8-1,8-4 divide 2 outermost end that are located at this transmission measurement module, and gold-plated off axis paraboloidal mirror 8-1,8-4 be oblique miter angle setting each other; Between 2 gold-plated off axis paraboloidal mirrors, be inserted with 2 Terahertz lens 8-2, the 8-3 of surface level each other; First gold-plated off axis paraboloidal mirror 8-1 is with respect to being provided with based on the 153mm place after the terahertz transmitter 7 of photoconduction antenna, the THz wave that will be given off by the terahertz transmitter 7 based on the photoconduction antenna is collected, generation has the parallel beam of certain width, and direction of beam propagation is changed 90 degree; Place first Terahertz lens 8-2 behind gold-plated off axis paraboloidal mirror 8-1,50mm place behind the gold-plated off axis paraboloidal mirror 8-1 of Terahertz lens 8-2 distance converges wide Terahertz parallel beam; Second Terahertz lens 8-3 placed at the 100mm place behind Terahertz lens 8-2, is again parallel beam by the thz beam behind the Terahertz lens 8-3; Second gold-plated off axis paraboloidal mirror 8-4 is provided with respect to terahertz detector 17 places, 50mm behind the Terahertz lens 8-3; Parallel beam direction of propagation behind gold-plated off axis paraboloidal mirror 8-4 changes 90 degree, both wide Terahertz parallel beam is converged on the terahertz detector 17.
Used gold-plated off axis paraboloidal mirror 8-1, the 8-4 of this example selects for use and produced by Newport (U.S. Advanced LCD Technologies Dev Co Ltd), model is the gold-plated off axis paraboloidal mirror of 50329AU, Terahertz lens 8-2,8-3 select for use by Zomega (U.S. Zuo Mijia company) and produce, and model is the Terahertz lens of TPX Lens; All eyeglass 8-1,8-4,8-2,8-3 all are fixed on the transmission mirror holder; And then 4 transmission mirror holders are fixed on the optical backplane, use as a transmission measurement module whole.
Example 2:
As Fig. 2, shown in Figure 4, small-sized terahertz time-domain spectroscopy instrument of the present utility model is by femtosecond pulse fiber laser 1,1/2 wave plate 2, polarization beam apparatus 3, the pumping light path, survey light path, based on the terahertz transmitter 7 of photoconduction antenna, reflection measurement module 8 ', polaroid 15, silicon chip 16, terahertz detector 17, data acquisition and disposal system 18 assemble.
The structure connected mode of this example 2 used units is basic identical with example 1 with used product type, does not repeat them here.
Its difference is: used reflection measurement module 8 ' is except that basic identical with transmission measurement module 8 agent structures, and the centre between 2 Terahertz lens 8-2,8-3 also is provided with the reflection measurement light district that is made of aluminize plane mirror 8-5,8-6,8-7; Wherein, aluminize plane mirror 8-5,8-6 between 2 Terahertz lens 8-2,8-3 for two, crossing near an end in the outside, opening-like near an inboard end, intersecting an end angle is 120 degree angles; The 3rd plane mirror 8-7 that aluminizes is vertically installed in two plane mirror 8-5 that aluminize and intersects 25mm place, the end outside with the plane mirror 8-6 that aluminizes; Leave the position of putting sample in the inboard of the 3rd plane mirror 8-7 that aluminizes;
First plane mirror 8-5 that aluminizes is placed on 25mm place behind the Terahertz lens 8-2, place with the wide Terahertz parallel beam folder 30 degree angles that Terahertz lens 8-2 sees through, the effect of plane mirror 8-5 of aluminizing is that the THz wave direction of propagation of will converge changes 120 degree laterally, and focus is placed on the 3rd plane mirror 8-7 that aluminizes; The thz beam that converges is reflexed on second plane mirror 8-6 that aluminizes, and the direction of propagation changes 60 degree, and measuring samples also will be positioned on the plane mirror 8-7 that aluminizes simultaneously; The plane mirror 8-6 that aluminizes receives by the terahertz light direction of propagation of the plane mirror 8-7 reflection of aluminizing and inwardly surveys change 120 degree, makes the direction of propagation return to through the state before the plane mirror 8-5 that aluminizes, and shines afterwards on second Terahertz lens 8-3; Second Terahertz lens 8-3 placed at the 25mm place behind the plane mirror 8-6 that aluminizes, and is parallel beam again by the thz beam behind the plane mirror 8-5 that aluminizes; Second gold-plated off axis paraboloidal mirror 8-4 placed at the 50mm place behind the plane mirror 8-5 that aluminizes, the thz beam direction of propagation is changed 90 degree, both wide Terahertz parallel beam was converged on the terahertz detector 17, terahertz detector 17 is 153mm at a distance of the distance of gold-plated off axis paraboloidal mirror 8-4.With Terahertz lens 8-1,8-2, gold-plated off axis paraboloidal mirror 8-3,8-4 are fixed on separately the transmission mirror holder, on the plane mirror eyeglass 8-5 that aluminizes, the fixing reflector mount separately of 8-6,8-7; And then 4 transmission mirror holders and 3 reflector mounts are fixed on the optical backplane, use as a reflection measurement module whole.
Used aluminize plane mirror 8-5,8-6,8-7 selects for use by Daheng Xinshijiyuan Science ﹠ Technology Co., Ltd. and produces in this example, and model is the GCC-102102 plane mirror of aluminizing.
Claims (8)
1. a small-sized terahertz time-domain spectroscopy instrument comprises femtosecond pulse laser, is arranged on the beam splitter of femtosecond pulse laser output terminal, and beam splitter is divided into 2 bundles with beam of laser; A branch of is pump light, and another bundle is for surveying light; Pump light converges on the terahertz transmitter through the pumping light path, the terahertz emission ripple and the detecting light beam through surveying light path that are produced by terahertz transmitter are coupled on the terahertz detector by conllinear, the optical signalling that terahertz detector obtains sends into data acquisition and disposal system is carried out the photosignal conversion, obtains the optical parametric of measured matter; It is characterized in that: described femtosecond pulse laser is femtosecond pulse fiber laser (1), and described beam splitter is polarization beam apparatus (3); Between femtosecond pulse fiber laser (1) and polarization beam apparatus (3), be provided with one 1/2 wave plates (2); Described terahertz transmitter is based on the terahertz transmitter of photoconduction antenna (7); Based on the terahertz transmitter (7) of photoconduction antenna to a transmission measurement module (8) is housed between the terahertz detector (17), described terahertz emission ripple converges on the described terahertz detector (17) behind this transmission measurement module (8), silicon chip (16) successively.
2. small-sized terahertz time-domain spectroscopy instrument according to claim 1 is characterized in that: described transmission measurement module (8) (8-4) (8-3) is combined with 2 Terahertz lens (8-2) by the 2 gold-plated off axis paraboloidal mirrors (8-1) that are fixed on the optical backplane; Described gold-plated off axis paraboloidal mirror (8-1) (8-4) divides 2 ends that are located at this transmission measurement module, inner bevel setting each other; Between 2 gold-plated off axis paraboloidal mirrors, be inserted with 2 each other surface level Terahertz lens (8-2) (8-3); Wherein, the 153mm place of gold-plated off axis paraboloidal mirror (8-1) after with respect to described terahertz transmitter (7) is provided with; Gold-plated off axis paraboloidal mirror (8-4) is provided with respect to described terahertz detector (17); (8-3) each (8-4) is provided with at the 50mm place apart from gold-plated off axis paraboloidal mirror (8-1) Terahertz lens (8-2); Distance is 100mm between Terahertz lens (8-2) and the Terahertz lens (8-3).
3. a small-sized terahertz time-domain spectroscopy instrument comprises femtosecond pulse laser, is arranged on the beam splitter of femtosecond pulse laser output terminal, and beam splitter is divided into 2 bundles with beam of laser; A branch of is pump light, and another bundle is for surveying light; Pump light converges on the terahertz transmitter through the pumping light path, the terahertz emission ripple and the detecting light beam through surveying light path that are produced by terahertz transmitter are coupled on the terahertz detector by conllinear, the optical signalling that terahertz detector obtains sends into data acquisition and disposal system is carried out the photosignal conversion, obtains the optical parametric of measured matter; It is characterized in that: described femtosecond pulse laser is femtosecond pulse fiber laser (1), and described beam splitter is polarization beam apparatus (3); Between femtosecond pulse fiber laser (1) and polarization beam apparatus (3), be provided with one 1/2 wave plates (2); Described terahertz transmitter is based on the terahertz transmitter of photoconduction antenna (7); To between the terahertz detector (17) a reflection measurement module (8 ') is housed in the terahertz transmitter (7) based on the photoconduction antenna, described terahertz emission ripple converges on the described terahertz detector (17) behind this reflection measurement module (8 '), silicon chip (16) successively.
4. small-sized terahertz time-domain spectroscopy instrument according to claim 3 is characterized in that: described reflection measurement module (8 ') by be fixed on the optical backplane 2 gold-plated off axis paraboloidal mirrors (8-1) (8-4), 2 Terahertz lens (8-2) (8-3) with place 3 plane mirrors of aluminizing (8-5), (8-6), (8-7) on the reflector mount to combine; 2 described gold-plated off axis paraboloidal mirrors (8-1) (8-4) divide 2 ends that are located at this transmission measurement module, inner bevel setting each other; Between 2 gold-plated off axis paraboloidal mirrors, be inserted with 2 each other surface level Terahertz lens (8-2) (8-3); 3 plane mirrors of aluminizing (8-5), (8-6), (8-7) be loaded on 2 Terahertz lens (8-2) (8-3) between; Wherein, the 153mm place of gold-plated off axis paraboloidal mirror (8-1) after with respect to described terahertz transmitter (7) is provided with; Gold-plated off axis paraboloidal mirror (8-4) is provided with respect to described terahertz detector (17); (8-3) each (8-4) is provided with at the 50mm place apart from 2 gold-plated off axis paraboloidal mirrors (8-1) 2 Terahertz lens (8-2); Between Terahertz lens (82) and the Terahertz lens (8-3) at a distance of 100mm; The mode level that 2 described plane mirrors of aluminizing (8-5) (8-6) intersect with an end is located in the medium position of 2 Terahertz lens (8-2) between (8-3), and its interior angle that intersects end is 120 degree; The described plane mirror of aluminizing (8-7) intersects vertical setting the in 25mm place, the end outside apart from it, leaves the position of putting measuring samples in the inboard of the plane mirror of aluminizing (8-7).
5. small-sized terahertz time-domain spectroscopy instrument according to claim 2 is characterized in that: described pump light route polarization beam apparatus (3) beginning, be disposed with plane mirror (4), fast optical delayed sweep device (5) and quartzy plano-convex lens (6); Described detection optical routing polarization beam apparatus (3) beginning, be disposed with plane mirror (9), (10), (11), (12), quartzy plano-convex lens (13), plane mirror (14), polaroid (15) and silicon chip (16).
6. small-sized terahertz time-domain spectroscopy instrument according to claim 4 is characterized in that: described pump light route polarization beam apparatus (3) beginning, be disposed with plane mirror (4), described fast optical delayed sweep device (5) and quartzy plano-convex lens (6); Described detection optical routing polarization beam apparatus (3) beginning, be disposed with plane mirror (9), (10), (11), (12), quartzy plano-convex lens (13), plane mirror (14), polaroid (15) and silicon chip (16).
7. according to each described small-sized terahertz time-domain spectroscopy instrument of claim 1-6, it is characterized in that: described data acquisition and disposal system (18) are disposed with quarter wave plate (18-1) by input end, quartzy plano-convex lens (18-2), Wollaston prism (18-3), differential detector (18-4), lock-in amplifier (18-5) and computing machine (18-6).
8. small-sized terahertz time-domain spectroscopy instrument according to claim 7 is characterized in that: described differential detector (18-4) is composed in series by two photodiodes; Its input end receives the orthogonal light intensity signal in two bundle polarization directions by Wollaston prism (18-3) output, shines respectively on two photodiodes, and photodiode then is converted into electric signal to light intensity signal; Electric signal inputs to by a coaxial wire on the differential input end mouth of lock-in amplifier (18-5), and electric signal inputs to computing machine (18-6) and carries out data processing after lock-in amplifier (18-5) amplifies.
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Effective date of registration: 20180828 Address after: 100176 Beijing Beijing economic and Technological Development Zone, Chuang Chuang seven street 29 hospital 2 Building 4 level 406 Patentee after: Ou Biyi (Beijing) Co., Ltd. terahertz technology Address before: 100048 No. 105 North Road, West Third Ring Road, Haidian District, Beijing. Patentee before: Capital Normal Univ. |
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