CN106841082B - Portable terahertz time-domain spectroscopy instrument - Google Patents

Portable terahertz time-domain spectroscopy instrument Download PDF

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Publication number
CN106841082B
CN106841082B CN201710033171.8A CN201710033171A CN106841082B CN 106841082 B CN106841082 B CN 106841082B CN 201710033171 A CN201710033171 A CN 201710033171A CN 106841082 B CN106841082 B CN 106841082B
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terahertz
module
plated
gold
mirror
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CN106841082A (en
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曾和平
南君义
李敏
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Chongqing Institute of East China Normal University
Shanghai Langyan Optoelectronics Technology Co Ltd
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East China Normal University
Shanghai Langyan Optoelectronics Technology Co Ltd
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N21/35Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infra-red light
    • G01N21/3581Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infra-red light using far infra-red light; using Terahertz radiation
    • G01N21/3586Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infra-red light using far infra-red light; using Terahertz radiation by Terahertz time domain spectroscopy [THz-TDS]
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01JMEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED, VISIBLE OR ULTRA-VIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/28Investigating the spectrum

Abstract

The present invention provides a kind of portable terahertz time-domain spectroscopy instrument comprising: for exporting Terahertz pump light and detecting the femtosecond pulse light laser module of light;Optical path for controlling Terahertz transmission optical path is climbed module;For generating the terahertz sources module of terahertz pulse;For detecting the terahertz detection module for carrying sample terahertz light spectrum information;For acquiring and analyzing the data processing and instrument controlling module of terahertz time-domain spectroscopy data;And the power module for power supply.The present invention has the advantages that Terahertz transmission optical path is spatially designed as upper layer and lower layer foldable structure, significantly reduces the planar dimension of terahertz time-domain spectroscopy instrument using the design feature of gold-plated off axis paraboloidal mirror.

Description

Portable terahertz time-domain spectroscopy instrument
Technical field
The present invention relates to a kind of portable terahertz time-domain spectroscopy instrument.Belong to novel terahertz time-domain spectroscopy apparatus structure skill Art field.
Background technique
Terahertz (THz) wave is a particular frequency bands between infrared ray and millimeter wave, typically refers to frequency and exists 0.1THz to 10THz (1THz=1012Hz between).The special property of THz wave gives communication (broadband connections), radar, electricity Sub- confrontation, ELECTROMAGNETIC WEAPON, astronomy, medical imaging (imaging of unmarked genetic test, cellular level), non-destructive testing, peace The fields such as total inspection (inspection of biological) bring far-reaching influence.Terahertz pulse light source mainly has compared to conventional light source There is the features such as transient state, coherence, broadband property, low energy, some materials penetrability, dactylogram.In the more than ten years in past, terahertz Hereby application gradually penetrates into the fields such as physics, sensing, communication, life science.
Terahertz time-domain spectroscopic technology is one of main application of Terahertz, in non-destructive testing, illicit drugs inspection, grain seed selection There is its unique advantage in terms of safety inspection.Currently, terahertz time-domain spectroscopic technology mostly uses greatly photoconductive antenna transmitting too Hertz wave detects THz wave with the mode of photoconductive antenna or electro optic sampling.The former has compact structure, detection signal-to-noise ratio High advantage;The advantages that direct impulse energy needed for the latter is low, highly sensitive and detective bandwidth.However, when current Terahertz Domain spectral technique is built upon mostly inside laboratory, there is that system bulk is big, and portability is poor, and spectral detection speed Slowly, the defects of complicated for operation.
Summary of the invention
In order to solve above-mentioned defect existing in the prior art, the purpose of the present invention is to provide a kind of portable Terahertzs Time-domain spectroscopy instrument device.The device sample need to be only put into measurement module can to realize to sample rapid survey its transmission too Hertz spectrum, while THz wave transmission optical path is carried out by space folding up and down using height plane mirror, it is greatly saved Space structure provides new method for the portable design of terahertz time-domain spectroscopy instrument.
The present invention is achieved by the following technical solutions:
The present invention provides a kind of portable terahertz time-domain spectroscopy instrument comprising:
For exporting Terahertz pump light and detecting the femtosecond-pulse fiber laser module of light;
Optical path for controlling Terahertz transmission optical path is climbed module;
For generating the terahertz sources module of terahertz pulse;
For detecting the terahertz detection module for carrying sample terahertz light spectrum information;
For acquiring and analyzing the data processing and instrument controlling module of terahertz time-domain spectroscopy data;And
Power module for power supply;
The optical path climb module include beam splitter, the first plane mirror, the first gold-plated off axis paraboloidal mirror, second plating Golden off axis paraboloidal mirror and example platform, the beam splitter are arranged in parallel with the first plane mirror vertical direction, and described first Vertical parallel, the confocal setting of gold-plated off axis paraboloidal mirror and the second gold-plated off axis paraboloidal mirror, the example platform are set to the At public focus between one gold-plated off axis paraboloidal mirror and the second gold-plated off axis paraboloidal mirror, femtosecond pulse passes through beam splitting It is divided into pump light and detection light two parts after mirror, wherein the detection light is directly transmitted into terahertz detection from beam splitter In module, the pump light is entered to inject in terahertz sources module by beam splitter front surface and the first plane mirror, described The THz wave that terahertz sources module generates is incident on example platform by the first gold-plated off axis paraboloidal mirror convergence, then thoroughly The THz wave penetrated is incident on the second gold-plated off axis paraboloidal mirror, and THz wave is finally by terahertz detection module collection.
Preferably, the terahertz sources module includes: that the first lens, the first photoconductive antenna, third are gold-plated Off axis paraboloidal mirror and second plane mirror, second plane mirror setting is climbed module rear in optical path, with first Lens, the first photoconductive antenna and the gold-plated off axis paraboloidal mirror of third are placed in same level, and pump light is climbed by optical path After high module, after second plane mirror and the first lens, it is coupled on the first photoconductive antenna, gives off Terahertz Wave, the first photoconductive antenna are placed on the THz wave given off in the focus of the gold-plated off axis paraboloidal mirror of third and plate by third Incident entering light road is climbed in module after golden off axis paraboloidal mirror.
Preferably, the terahertz detection module includes: optical delay line, the second lens, the second photoconductive day Line, the 4th gold-plated off axis paraboloidal mirror, lock-in amplifier and third plane mirror, all devices in terahertz detection module It is all in same level with detection light, detection light first passes through third plane mirror and enters in optical delay line, then passes through The second lens are crossed to be coupled into the second photoconductive antenna, into the THz wave in terahertz detection module by the 4th it is gold-plated from Axis paraboloidal mirror collection is coupled into the second photoconductive antenna, and terahertz wave signal is converted into faint voltage signal.
Preferably, the data processing and instrument controlling module include: data collecting card and computer, for adopting Collection and analysis voltage signal, obtain the terahertz light spectrum information of sample.
Preferably, the power module includes: the electricity of the power supply of femtosecond-pulse fiber laser, lock-in amplifier Source, motor control box and control box power supply.
Compared with prior art, the present invention have it is following the utility model has the advantages that
1, using the design feature of gold-plated off axis paraboloidal mirror, Terahertz transmission optical path is spatially designed as upper and lower two Layer foldable structure, significantly reduces the planar dimension of terahertz time-domain spectroscopy instrument;
2, the utilization of this upper layer and lower layer foldable structure, can also increase the internal capacity of terahertz time-domain spectroscopy instrument, can More multiple instruments, such as lock-in amplifier, femtosecond-pulse fiber laser, power supply are integrated with instrument internal, instrument can be made full use of Internal space;
3, THz wave after the focusing of gold-plated off axis paraboloidal mirror it is incident vertically downward on the test specimen, not only terahertz Hereby wave measurement effect after over-focusing is more preferable, and sample can be horizontally arranged, and measurement powder, liquid etc. is suitble to be not easy to clamp Sample, it is more convenient;
4, portable terahertz time-domain spectroscopy instrument uses modularized design, and same software control can be used in each module, It is convenient to operate.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention, Objects and advantages will become more apparent upon:
Fig. 1 is the schematic diagram of internal structure of the portable terahertz time-domain spectroscopy instrument of the present invention;
Fig. 2 is that optical path is climbed module assembled structural schematic diagram;
Fig. 3 is terahertz sources module assembled structural schematic diagram;
Fig. 4 is terahertz detection module assembled structural schematic diagram;
In figure: 1, femtosecond-pulse fiber laser module;2, optical path is climbed module;3, terahertz sources module;4, terahertz Hereby detecting module;5, data processing and instrument controlling module;6, power module;21, beam splitter;22-1, the first plane mirror; 22-2, second plane mirror;22-3, third plane mirror;23, the first gold-plated off axis paraboloidal mirror;24, example platform; 25, the second gold-plated off axis paraboloidal mirror;32-1, the first lens;32-2, the second lens;33, the first photoconducting antenna;34, third is plated Golden off axis paraboloidal mirror;42, the first optical delay line;43, the second optical delay line;45, the second photoconducting antenna;46, the 4th plating Golden off axis paraboloidal mirror.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to the present invention Protection scope.
The femtosecond-pulse fiber laser module that is related in the present invention, the optical delay line in terahertz detection module and Lock-in amplifier etc. in data processing and instrument controlling module belongs to the prior art.
As shown in Figure 1 to 4, the portable terahertz time-domain spectroscopy instrument of the present invention is by femtosecond-pulse fiber laser module 1 (prior art can be femtosecond-pulse fiber laser), optical path are climbed module 2, terahertz sources module 3 (prior art, Can be terahertz light conductance transmitting antenna), (prior art can be terahertz light conductance and receives day terahertz detection module 4 Line), data processing and instrument controlling module 5, power module 6 (prior art, lock-in amplifier are produced using FEMTO company, Data collecting card use NI company USB6210) etc. composition.
Femtosecond-pulse fiber laser module 1 includes: a small-sized femtosecond-pulse fiber laser.By femtosecond-pulse fiber Laser module 1 exports femtosecond pulse, and pump light and detection light two parts are divided into after the beam splitter 21 of 1:1.
As shown in Fig. 2, optical path is climbed, module 2 includes: the beam splitter 21 of one piece of 1:1, the first plane mirror 22-1, first Gold-plated off axis paraboloidal mirror 23, the second gold-plated off axis paraboloidal mirror 25, example platform 24.The pump light is by beam splitter 21 Front surface is reflected vertically upward with 90 ° of angles, then by the first plane mirror 22-1 with right angle the light pulse propagated straight up It being converted into propagating in the horizontal direction, beam splitter 21 and the first plane mirror 22-1 constitute pump light optical path height mirror, so that Difference in height h is formed between pump light and detection light, spatially realizes optical path up and down folding.The detection light is from beam splitter The part of 21 transmissions, enters in terahertz detection module 4 after transmission.
Terahertz sources module 3 includes: second plane mirror 22-2, the first lens 32-1, the first photoconductive antenna 33, the gold-plated off axis paraboloidal mirror 34 of third;Pump light is climbed by optical path after module, by second plane mirror 22-2 and After first lens 32-1, it is coupled on the first photoconductive antenna 33, gives off THz wave.First photoconductive antenna 33 is placed In the focus of the gold-plated off axis paraboloidal mirror 34 of third, THz wave that the gold-plated off axis paraboloidal mirror 34 of third gives off cone cell It is shaped to plane wave.Terahertz plane wave is reflected by gold-plated 34 right angle of off axis paraboloidal mirror of third, is climbed in module 2 into optical path Terahertz light path height mirror.
As shown in Fig. 2, the first gold-plated off axis paraboloidal mirror 23 and the second gold-plated off axis paraboloidal mirror 25 are along the vertical direction Be parallel to each other placement, confocal each other.Terahertz plane wave is reflected down after the first paraboloidal mirror 23 by 90 ° of angles, propagation side Become to by level along straight down, and focuses on example platform 24.Example platform 24 is horizontal positioned, puts sample to be tested When it is more convenient, and there is an aperture in centre, THz wave can be made to pass through completely.From example platform 24 transmitted through come terahertz Hereby using the second gold-plated off axis paraboloidal mirror 25, the direction of propagation becomes in the horizontal direction from straight down again, and return to It detects in light same level height, finally enters in terahertz detection module 4.
Terahertz detection module 4 includes: third plane mirror 22-3, the first optical delay line 42 and the first optical delay Line 43, the second lens 32-2, the second photoconductive antenna 45, the 4th gold-plated off axis paraboloidal mirror 46.It climbs to go out in module 2 from optical path The 4th gold-plated off axis paraboloidal mirror that the Terahertz plane wave penetrated is placed with the second gold-plated 25 horizontal parallel of off axis paraboloidal mirror 46 collect, and focus and be incident on the silicon lens of the second photoconductive antenna 45.The detection light arteries and veins transmitted from 1:1 beam splitter 21 Punching is coupled into the first optical delay line 42 and the second optical delay line 43 after third plane mirror 22-3, then light It learns the light pulse being emitted in delay line to focus by the second lens 32-2, is finally coupled on the second photoconductive antenna 45, generates Photo-generated carrier.By the first optical delay line 42 of control and the second optical delay line 43, change the light path of detection optical path Scanning probe goes out the time-domain signal of the transmission THz wave after sample.Terahertz detection module 4 will contain sample Terahertz The THz wave of spectral information is converted into faint electric signal, and output electric signal is sent into data processing and instrument controlling module 5.
Data processing and instrument controlling module 5 include: data collecting card and a computer.It is exported from lock-in amplifier Analog electrical signal be sent into after data collecting card A/D conversion in computer and carry out Fourier transformation, the data such as spectrum analysis Processing, can be obtained the terahertz time-domain spectroscopy information of sample.In addition, have the software for controlling a full set of instrument work on computer, Graphical control interface, it is easy to operate.
Power module 6 includes: the power supply of femtosecond-pulse fiber laser, the power supply and motor control box of lock-in amplifier and Power supply.As shown in Figure 1, power module 6 is placed on the upper surface of femtosecond-pulse fiber laser module 1, instrument can be made full use of Internal space, increases the utilization rate in instrument internal space, greatly reduces the planar dimension of instrument.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited to above-mentioned Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow Ring substantive content of the invention.

Claims (5)

1. a kind of portable terahertz time-domain spectroscopy instrument characterized by comprising
For exporting Terahertz pump light and detecting the femtosecond-pulse fiber laser module of light;
Optical path for controlling Terahertz transmission optical path is climbed module;
For generating the terahertz sources module of terahertz pulse;
For detecting the terahertz detection module for carrying sample terahertz light spectrum information;
For acquiring and analyzing the data processing and instrument controlling module of terahertz time-domain spectroscopy data;And
Power module for power supply;
The optical path climb module include beam splitter, the first plane mirror, the first gold-plated off axis paraboloidal mirror, second it is gold-plated from Axis paraboloidal mirror and example platform, the beam splitter are arranged in parallel with the first plane mirror vertical direction, and described first is gold-plated Off axis paraboloidal mirror is set to the first plating with vertical parallel, the confocal setting of the second gold-plated off axis paraboloidal mirror, the example platform At public focus between golden off axis paraboloidal mirror and the second gold-plated off axis paraboloidal mirror, femtosecond pulse is after beam splitter It is divided into pump light and detection light two parts, wherein the detection light is directly transmitted into terahertz detection module from beam splitter In, the pump light is entered to inject in terahertz sources module by beam splitter front surface and the first plane mirror, the terahertz The THz wave that hereby transmitting module generates is incident on example platform by the first gold-plated off axis paraboloidal mirror convergence, is then transmitted THz wave is incident on the second gold-plated off axis paraboloidal mirror, and THz wave is finally by terahertz detection module collection.
2. portable terahertz time-domain spectroscopy instrument as described in claim 1, which is characterized in that the terahertz sources module packet It includes: the first lens, the first photoconductive antenna, the gold-plated off axis paraboloidal mirror of third and second plane mirror, second plane Reflecting mirror setting is climbed module rear in optical path, with the first lens, the first photoconductive antenna and the gold-plated off axis paraboloidal mirror of third It being placed in same level, pump light is climbed by optical path after module, after second plane mirror and the first lens, quilt It is coupled on the first photoconductive antenna, gives off THz wave, the first photoconductive antenna is placed on the gold-plated off axis paraboloid mirror of third It climbs in module on the THz wave given off in the focus of mirror incident entering light road after the gold-plated off axis paraboloidal mirror of third.
3. portable terahertz time-domain spectroscopy instrument as described in claim 1, which is characterized in that the terahertz detection module packet Include: optical delay line, the second lens, the second photoconductive antenna, the 4th gold-plated off axis paraboloidal mirror, lock-in amplifier and third are flat Face reflecting mirror, all devices in terahertz detection module all be in same level with detection light, are detected light and are first passed through the Three plane mirrors enter in optical delay line, are then coupled into the second photoconductive antenna by the second lens, into too THz wave in hertz detecting module is coupled into the second photoconductive antenna by the 4th gold-plated off axis paraboloidal mirror collection, will too Hertz wave signal is converted into faint voltage signal.
4. portable terahertz time-domain spectroscopy instrument as described in claim 1, which is characterized in that the data processing and instrument control Molding block includes: data collecting card and computer, and for acquiring and analyzing voltage signal, the tera-hertz spectra for obtaining sample is believed Breath.
5. portable terahertz time-domain spectroscopy instrument as described in claim 1, which is characterized in that the power module includes: winged The power supply of pulse per second (PPS) optical fiber laser, the power supply of lock-in amplifier, motor control box and control box power supply.
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CN108181261A (en) * 2017-12-27 2018-06-19 上海理工大学 Device based on terahertz time-domain spectroscopy detection mixed gas each component content
CN109556714A (en) * 2018-10-31 2019-04-02 中国科学院半导体研究所 Terahertz light spectrum chip
CN111024622B (en) * 2019-11-28 2022-04-22 北京遥测技术研究所 Compact detection system for realizing handheld terahertz reflection spectrum detection

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