CN202631110U - Terahertz time domain double spectrum detecting system - Google Patents
Terahertz time domain double spectrum detecting system Download PDFInfo
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- CN202631110U CN202631110U CN 201220251729 CN201220251729U CN202631110U CN 202631110 U CN202631110 U CN 202631110U CN 201220251729 CN201220251729 CN 201220251729 CN 201220251729 U CN201220251729 U CN 201220251729U CN 202631110 U CN202631110 U CN 202631110U
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Abstract
Provided is a terahertz time domain double spectrum detecting system. A femtosecond laser is divided into detecting light and pumping light by a polarization beam splitter after passing through a diaphragm and a one-half wave plate. The detecting light passes through a lens, a time-lag device and a reflector in sequence, and then is in light connection with a polarization beam splitter II. After the detecting light enters into the polarization beam splitter II, a beam of the detecting light enters into a transmission light detecting device A through a polarizing film and then is in light connection with a silicon wafer and a parabolic mirror IV of the transmission light detecting device A, and the other beam of the detecting light enters into a reflected light detecting device B through another polarizing film and then is in light connection with a silicon wafer and a parabolic mirror IV of the reflected light detecting device B. The pumping light radiates terahertz waves through a photoconductive antenna terahertz emitter, and then is collected on a sample by a parabolic mirror I and a parabolic mirror II. Transmission light is in light connection with a parabolic mirror III in the transmission light detecting device A, and reflected light is in light connection with a parabolic mirror III in the reflected light detecting device B. A transmission terahertz signal and a reflected terahertz signal are respectively transmitted to an electro-optical crystal of the transmission light detecting device A and an electro-optical crystal of the reflected light detecting device B in a mode of being collinear with the detecting light, and then the transmission terahertz signal and the reflected terahertz signal are received by a differential detector. Differential current signals which are output are respectively connected with a lock-in amplifier and a computer. The terahertz time domain double spectrum detecting system is capable of simultaneously detecting a transmitted spectrum and a reflectance spectrum.
Description
Technical field
The utility model relates to the two spectral detection systems of a kind of terahertz time-domain, can detect transmission and reflection time-domain spectroscopy simultaneously.
Background technology
The Terahertz frequency range is meant the electromagnetic radiation zone of frequency from 0.1THz to 10THz.Terahertz emission is owing to have a transient state property, the character of uniqueness such as low energy property and coherence, and in satellite communication, Non-Destructive Testing, military radar, aspects such as health care have great scientific value and wide application prospect.The terahertz light spectral technology is a key areas of terahertz emission Practical Research; This technology has the 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 terahertz time-domain spectroscopy detection system that at home and abroad adopts at present; Basically be divided into two kinds of mode of operations of transmission-type and reflection-type, separate separately, each measurement all can only select a pattern to measure; Therefore, such detection system can not well satisfy actual demand; When in experiment, wanting to obtain transmission spectrum and reflectance spectrum simultaneously, often to measure twice with the system of different mode, so not only time-consuming, and the reliability of experiment also can reduce.
The utility model content
The utility model discloses the two spectral detection systems of a kind of terahertz time-domain; Can in same modular system, detect transmission and reflection time-domain spectroscopy simultaneously; Overcome prior art and can only adopt a kind of pattern independent test, cause test result reliability difference and time-consuming drawback.
The two spectral detection systems of a kind of terahertz time-domain send femtosecond laser by femto-second laser, through diaphragm, behind 1/2 wave plate, are divided into detection light and pump light by polarizing beam splitter mirror; Survey light and pass through lens successively, deferred mount, catoptron is connected with polarizing beam splitter mirror two light; Pump light is through photoconductive antenna terahertz transmitter radiation THz wave, polished object face mirror one, and polished object face mirror two is collected and is converged to sample; It is characterized in that:
A) survey light and get into polarizing beam splitter mirror two after, a branch ofly enter into transmitted light pick-up unit A through polaroid, another polaroid of another Shu Guangjing enters into reflected light pick-up unit B; Be connected with separately silicon chip, paraboloidal mirror four light then;
B) after pump light polished object face mirror two was collected and converged to sample, transmitted light was connected with paraboloidal mirror three light among the transmitted light pick-up unit A; Reflected light is connected with paraboloidal mirror three light among the reflected light pick-up unit B;
C) A transmitted light and the reflected light detection means detecting device B of the pump light and the probe light, respectively, of the respective line of the parabolic mirror served four respective electro-optical crystal, 1/4 wave plate, a third plano-convex lens, Wal Adams through the prism; Prism stone wall out from the direction of polarization of the two beams polarized perpendicular to each other via a differential detector receiving the transmitted light and the reflected light detecting means detecting means A and B outputs are respectively connected to a differential current signal input of lock-in amplifier end of the lock-in amplifier output terminal connected to the computer.
Distance between described paraboloidal mirror one and the photoconductive antenna terahertz transmitter is 50.8mm; Distance between paraboloidal mirror two and the paraboloidal mirror one is less than 500mm; Paraboloidal mirror three is 228.6mm with the distance of paraboloidal mirror two, and sample and paraboloidal mirror three distances are 152.4mm; Paraboloidal mirror four is the best to the distance between the paraboloidal mirror three just enough to settle silicon chip.
The incident angle that the THz wave of described photoconductive antenna terahertz transmitter radiation gets into sample is 45.
Owing to adopted as above technical scheme, the advantage and the good effect of the utility model are following:
1. can realize easily object transmission terahertz time-domain electric field signal and the reflected terahertz single-measurement or the measurement simultaneously of time domain electric field signal now according to the needs of Measuring Object; And need not system be made any change, the terahertz light spectrum information of acquisition is more than other system, is convenient to character such as the structure of matter are made analysis more accurately.
2. adopt photoconductive antenna terahertz transmitter radiation Terahertz, the system that makes can obtain the stronger Terahertz electric field intensity and the bandwidth of broad.
3. all adopted the collection collimation of paraboloidal mirror for this system as THz wave, converging device, rather than converge with silicon lens, reduced the loss of THz wave on device to a great extent, improved by the intensity of detectable signal.
Description of drawings
Fig. 1 is the two spectral detection system architecture synoptic diagram of the utility model terahertz time-domain.
1, the femtosecond laser, 2, the first diaphragm, 3,1 / 2 wave plate 4, a polarization beam splitter, 5, choppers, 6, the attenuator 7, the second diaphragm 8, the first planoconvex 9 photoconductive terahertz transmitter antenna 10, a parabolic mirror, the parabolic mirror 11 II 12, a second plano-convex lens, 13, delay means 14, a mirror 15, a polarization beam splitter II.16 , a polarizer 17, silicon, 18, phototransistors, 19,1 / 4 wave plate 20, a third plano-convex lens, 21, Wal stone prism 22, the differential detector 23, a parabolic mirror III 24 , parabolic mirror IV 25 samples, 26, lock-in amplifier 27, the computer.
A: transmitted light pick-up unit, B: reflected light pick-up unit.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is elaborated.
The two spectral detection system architectures of terahertz time-domain are as shown in Figure 1, send femtosecond laser by femto-second laser 1, behind first diaphragm, 2,1/2 wave plates 3, are divided into pump light and surveyed light by polarizing beam splitter mirror 4.
Pump light is through chopper 5, attenuator 6, second diaphragm 7, first plano-convex lens 8; Get to radiation THz wave on the photoconductive antenna terahertz transmitter 9; The THz wave polished object face mirror 1 of radiation; After paraboloidal mirror 2 11 was collected and converged to sample 25, transmitted light and reflected light were sent to the paraboloidal mirror 3 23 among transmitted light pick-up unit A and the reflected light pick-up unit B respectively.
Survey light, pass through lens 12 successively, deferred mount 13; Catoptron 14; Arrive polarizing beam splitter mirror 2 15, be divided into two bundles and survey light, and then get into silicon chip 17, the paraboloidal mirror 4 24 of transmitted light pick-up unit A and reflected light pick-up unit B separately through a polaroid 16 respectively.
A transmitted light and the reflected light detecting means detecting apparatus B, respectively, the pumping light and probe light by a parabolic mirror served four collinear respective electro- optic crystal 18,1 / 4 wave plate 19, a third plano-convex lens 20, Wal Stone prism 21, wherein the prism 21 from the wall of stone out of the two beams of the two polarization directions perpendicular to each other by the differential detector beam splitter 22 receives, variable light intensity signal into an electrical signal, and the difference signal into the phase lock amplifier 26, the computer 27 for signal processing to obtain the projection and reflection spectra of the sample information.
Distance between described paraboloidal mirror 1 and the photoconductive antenna terahertz transmitter 9 is 50.8mm; Distance between paraboloidal mirror 2 11 and the paraboloidal mirror 1 is less than 500mm; Paraboloidal mirror 3 23 is 228.6mm with the distance of paraboloidal mirror two, and sample 25 is 152.4mm with the distance of paraboloidal mirror 3 23; Distance between paraboloidal mirror 4 24 and the paraboloidal mirror 3 23 is the best just enough to settle silicon chip 17.
The incident angle that the THz wave of described photoconductive antenna terahertz transmitter 9 emissions gets into sample is 45.
The utility model transmitted light pick-up unit A and reflected light pick-up unit B light channel structure are identical.
Claims (3)
1. the two spectral detection systems of terahertz time-domain send femtosecond laser by femto-second laser (1), through diaphragm (2), behind 1/2 wave plate (3), are divided into detection light and pump light by polarizing beam splitter mirror (4); Survey light and pass through lens (12) successively, deferred mount (13), catoptron (14) is connected with polarizing beam splitter mirror two (15) light; Pump light is through photoconductive antenna terahertz transmitter (9) radiation THz wave, polished object face mirror one (10), and polished object face mirror two (11) is collected and is converged to sample (25); It is characterized in that:
A) survey light and get into polarizing beam splitter mirror two (15) after, a branch ofly enter into transmitted light pick-up unit A through polaroid (16), another polaroid of another Shu Guangjing (16) enters into reflected light pick-up unit B; Be connected with separately silicon chip (17), paraboloidal mirror four (24) light then;
B) after pump light polished object face mirror two (11) was collected and converged to sample, transmitted light was connected with paraboloidal mirror three (23) light among the transmitted light pick-up unit A; Reflected light is connected with paraboloidal mirror three (23) light among the reflected light pick-up unit B;
C) A transmitted light and the reflected light detection means detecting device B of the pump light and the probe light, respectively, via respective lines of the parabolic mirror served four respective electro-optical crystal (18), 1/4 wave plate (19), p. three flat convex lens (20), Wal stone prism (21), from a stone wall prism (21) points out the direction of polarization of the two beams of polarized light perpendicular to each other by the differential detector (22) is received, then the transmitted light detector means A and B outputs the reflected light detection means are connected a differential current signal lock-in amplifier (26) input terminal, lock-in amplifier (26) output terminal of the computer (27) connected.
2. the two spectral detection systems of terahertz time-domain according to claim 1, it is characterized in that: the distance between described paraboloidal mirror one (10) and the photoconductive antenna terahertz transmitter (9) is 50.8mm; Distance between paraboloidal mirror two (11) and the paraboloidal mirror one (10) is less than 500mm; Distance between paraboloidal mirror three (23) and the paraboloidal mirror two (11) is 228.6mm, and sample (25) is 152.4mm with the distance of paraboloidal mirror three (23); Distance between paraboloidal mirror four (24) and the paraboloidal mirror three (23) is the best just enough to settle silicon chip (17).
3. the two spectral detection systems of terahertz time-domain according to claim 1, it is characterized in that: the incident angle that the THz wave of described photoconductive antenna terahertz transmitter (9) radiation gets into sample is 45.
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| CN 201220251729 CN202631110U (en) | 2012-05-31 | 2012-05-31 | Terahertz time domain double spectrum detecting system |
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| CN 201220251729 CN202631110U (en) | 2012-05-31 | 2012-05-31 | Terahertz time domain double spectrum detecting system |
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| CN104515748A (en) * | 2015-01-21 | 2015-04-15 | 大恒光电科技发展(北京)有限公司 | Terahertz time-domain spectrograph based on femtosecond laser |
| CN104568819A (en) * | 2015-01-15 | 2015-04-29 | 南开大学 | All-fiber transmission reflection integrated terahertz time-domain spectroscopy system |
| CN105699317A (en) * | 2016-01-21 | 2016-06-22 | 电子科技大学 | Terahertz time-domain spectrograph capable of entering at fixed angle and simultaneously detecting transmission and reflection |
| CN105784634A (en) * | 2016-03-31 | 2016-07-20 | 电子科技大学 | Terahertz time domain spectrograph capable of measuring transmission and reflection simultaneously under vertical incidence |
| CN103972780B (en) * | 2014-05-16 | 2016-09-14 | 上海理工大学 | A kind of method being quickly found out laser pulse temporal overlapping positions by adjustable diaphragm |
| CN106197665A (en) * | 2015-04-29 | 2016-12-07 | 中国科学院苏州纳米技术与纳米仿生研究所 | Spectrum test device and method of testing thereof |
| CN106441580A (en) * | 2016-06-16 | 2017-02-22 | 电子科技大学 | Terahertz time-domain spectrometer capable of variable-angle incidence and simultaneous measurement of transmission and reflection |
| CN106841113A (en) * | 2017-01-04 | 2017-06-13 | 北京环境特性研究所 | A kind of method and apparatus of Terahertz frequency range synchro measure material wave transparent reflection characteristic |
| CN107036721A (en) * | 2016-11-11 | 2017-08-11 | 中国人民解放军国防科学技术大学 | Terahertz pulse time domain waveform detection method and system |
| CN107462548A (en) * | 2017-08-21 | 2017-12-12 | 燕山大学 | Underground pipe gallery gas concentration detection apparatus and detection method based on THz TDS technologies |
| CN107462547A (en) * | 2017-08-15 | 2017-12-12 | 上海拓领光电科技有限公司 | Mini terahertz time-domain spectroscopy test system |
| WO2018058798A1 (en) * | 2016-09-27 | 2018-04-05 | 深圳市太赫兹科技创新研究院有限公司 | Terahertz full-polarization-state detection spectrograph |
| CN108801915A (en) * | 2018-06-13 | 2018-11-13 | 深圳大学 | Pump probe system |
| CN108844913A (en) * | 2018-04-26 | 2018-11-20 | 中国工程物理研究院计量测试中心 | A kind of terahertz time-domain spectroscopy system and operating method |
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| CN113092402A (en) * | 2021-05-19 | 2021-07-09 | 中国电子科技集团公司第四十一研究所 | Non-contact substance terahertz characteristic spectrum detection and identification system and method |
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2012
- 2012-05-31 CN CN 201220251729 patent/CN202631110U/en not_active Expired - Fee Related
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| CN103972780B (en) * | 2014-05-16 | 2016-09-14 | 上海理工大学 | A kind of method being quickly found out laser pulse temporal overlapping positions by adjustable diaphragm |
| CN104568819A (en) * | 2015-01-15 | 2015-04-29 | 南开大学 | All-fiber transmission reflection integrated terahertz time-domain spectroscopy system |
| CN104515748A (en) * | 2015-01-21 | 2015-04-15 | 大恒光电科技发展(北京)有限公司 | Terahertz time-domain spectrograph based on femtosecond laser |
| CN106197665A (en) * | 2015-04-29 | 2016-12-07 | 中国科学院苏州纳米技术与纳米仿生研究所 | Spectrum test device and method of testing thereof |
| CN106197665B (en) * | 2015-04-29 | 2018-11-09 | 中国科学院苏州纳米技术与纳米仿生研究所 | Spectrum test device and its test method |
| CN105699317A (en) * | 2016-01-21 | 2016-06-22 | 电子科技大学 | Terahertz time-domain spectrograph capable of entering at fixed angle and simultaneously detecting transmission and reflection |
| CN105784634A (en) * | 2016-03-31 | 2016-07-20 | 电子科技大学 | Terahertz time domain spectrograph capable of measuring transmission and reflection simultaneously under vertical incidence |
| CN106441580A (en) * | 2016-06-16 | 2017-02-22 | 电子科技大学 | Terahertz time-domain spectrometer capable of variable-angle incidence and simultaneous measurement of transmission and reflection |
| WO2018058798A1 (en) * | 2016-09-27 | 2018-04-05 | 深圳市太赫兹科技创新研究院有限公司 | Terahertz full-polarization-state detection spectrograph |
| CN107036721B (en) * | 2016-11-11 | 2019-05-31 | 中国人民解放军国防科学技术大学 | Terahertz pulse time domain waveform detection method and system |
| CN107036721A (en) * | 2016-11-11 | 2017-08-11 | 中国人民解放军国防科学技术大学 | Terahertz pulse time domain waveform detection method and system |
| CN106841113A (en) * | 2017-01-04 | 2017-06-13 | 北京环境特性研究所 | A kind of method and apparatus of Terahertz frequency range synchro measure material wave transparent reflection characteristic |
| CN107462547B (en) * | 2017-08-15 | 2020-05-26 | 上海拓领光电科技有限公司 | Miniature terahertz time-domain spectroscopy test system |
| CN107462547A (en) * | 2017-08-15 | 2017-12-12 | 上海拓领光电科技有限公司 | Mini terahertz time-domain spectroscopy test system |
| CN107462548A (en) * | 2017-08-21 | 2017-12-12 | 燕山大学 | Underground pipe gallery gas concentration detection apparatus and detection method based on THz TDS technologies |
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| CN108801915A (en) * | 2018-06-13 | 2018-11-13 | 深圳大学 | Pump probe system |
| CN108801915B (en) * | 2018-06-13 | 2023-05-30 | 深圳大学 | Pump detection system |
| CN110207822B (en) * | 2019-05-29 | 2020-07-14 | 上海交通大学 | High-sensitivity optical time delay estimation system, method and medium |
| CN110207822A (en) * | 2019-05-29 | 2019-09-06 | 上海交通大学 | Highly sensitive optical time delay estimating system, method and medium |
| CN110082293A (en) * | 2019-06-03 | 2019-08-02 | 云南电网有限责任公司电力科学研究院 | A kind of insulation water content in oil non-destructive testing device and method |
| CN113092402A (en) * | 2021-05-19 | 2021-07-09 | 中国电子科技集团公司第四十一研究所 | Non-contact substance terahertz characteristic spectrum detection and identification system and method |
| CN113092402B (en) * | 2021-05-19 | 2022-11-15 | 中国电子科技集团公司第四十一研究所 | Non-contact substance terahertz characteristic spectrum detection and identification system and method |
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