CN2874476Y - Terahertz time domain spectral instrument based on optical rectification - Google Patents
Terahertz time domain spectral instrument based on optical rectification Download PDFInfo
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- CN2874476Y CN2874476Y CN 200620025319 CN200620025319U CN2874476Y CN 2874476 Y CN2874476 Y CN 2874476Y CN 200620025319 CN200620025319 CN 200620025319 CN 200620025319 U CN200620025319 U CN 200620025319U CN 2874476 Y CN2874476 Y CN 2874476Y
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Abstract
The utility model discloses an optical-based rectifier terahertz time-domain spectroscopy belonging to the improvement of THz time-domain spectroscopy device. The spectroscopy device comprises a femtosecond laser pulse, a terahertz launchers embedded in the vacuum system, a terahertz detectors and a data collection and processing system controlled by computer. The utility model is characterized in that: through computer-controlled data collection and processing system, the utility model can measure the electric field of terahertz time-domain signal of permeable material, and display the result on computer for the convenience of data analysis. In addition, the utility model can obtain a time-domain spectroscopy of permeable material, and the spectroscopy resolution precision can reach 0.03 to 0.001. The vacuum system brings Terahertz launch and probing parts into it, thus avoiding air moisture's impact on terahertz absorption and improving the measuring precision of material's spectroscopy; lens are arranged on the light route of pumping so as to change its power density to control the radiation efficiency of terahertz wave.
Description
Technical field
The utility model relates to a kind of terahertz time-domain spectroscopy instrument based on optical rectification, belongs to the improvement of terahertz time-domain spectroscopy device.
Background technology
Terahertz (THz, 1THz=10
12Hz) frequency range is meant the electromagnetic radiation zone of frequency from 0.1THz to 10THz, between millimeter wave and infrared light.Generation and detection for THz radiation pulse for a long time lacks effective method, cause people very limited for the understanding of this wave band electromagnetic radiation character, to such an extent as to this wave band is called as the THz space in the electromagnetic wave spectrum, also be last frequency window that pending comprehensive research is arranged in the electromagnetic wave spectrum.
Have very high time and spatial coherence by relevant femto-second laser pulse by the THz wave that the optical rectification effect produces.Existing terahertz time-domain spectroscopic technology (THz-TDS) is that the eighties in 20th century is by AT﹠amp; T, a kind of very effective electromagnetic radiation phase coherence measuring technology that Bell laboratory and IBM Corporation's common development are got up; The THz wavelet transformation time-domain spectroscopic technology (THz-WTDS) that we create can directly be measured the amplitude of oscillating electromagnetic fields and phase place and the frequency spectrum distribution character in time domain, and these characteristics make the Terahertz science and technology have great advantage when the relevant dynamics problem of the transient state of research material.The THz time-domain spectroscopic 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 several samples characteristic spectrum.
Summary of the invention
The purpose of this utility model is to provide a kind of terahertz time-domain spectroscopy instrument based on optical rectification, the terahertz time-domain spectroscopy of this spectrometer measurement transmissibility material, and the frequency range of this spectrometer is 0.5～2.5THz, spectrally resolved precision is 0.03～0.0001.
The utility model is realized by following technical proposals, a kind of terahertz time-domain spectroscopy instrument based on optical rectification, it is characterized in that, this spectrometer comprises femtosecond pulse laser 1, be arranged on the beam splitter 2 and the optical delay device 3 of pulsed laser output terminal, be arranged on terahertz transmitter 10-1, terahertz detector 10-5 in the vacuum system; With data acquisition and disposal system 11; Between beam splitter 2 and terahertz transmitter 10-1, set gradually chopper 6, plane mirror 7 and plano-convex lens 9, off axis paraboloid mirror transmitting mirror 10-2 is set after hertz transmitter 10-1; Constitute the pumping light path by femtosecond pulse laser 1, beam splitter 2, chopper 6, plane mirror 7, plano-convex lens 9 and terahertz transmitter 10-1; Between optical delay device 3 and terahertz detector 10-5, set gradually plane mirror 4,5 and plano-convex lens 8 and off axis paraboloid mirror transmitting mirror 10-4, pump light wave filter 10-3 is set between terahertz transmitter 10-1 and terahertz detector 10-5; Constitute the detection light path by femtosecond pulse laser 1, beam splitter 2, optical delay device 3, plane mirror 4,5 and plano-convex lens 8, off axis paraboloidal mirror 10-4 and terahertz detector 10-5; Described data acquisition and disposal system 11 comprise planar transmit mirror 11-1 successively, plano-convex lens 11-2, quarter-wave plate 11-3, wollaston prism 11-4, balance detection device 11-5, lock-in amplifier 11-6, computing machine 11-7.
The utility model has the advantages that: utilize by computer-controlled data Collection ﹠ Processing System, measure the terahertz time-domain electric field signal of transmissibility material, and be shown in computer screen, be convenient to data analysis; Can obtain the time-domain spectroscopy of transmittance material, it is 0.03～0.001 that spectrally resolved precision reaches; Vacuum system is included with Terahertz emission, probe portion, has avoided water in air to the influence that Terahertz absorbs, and has improved the measuring accuracy of transmissibility substance spectra; Lens are installed in order to change the power density of pump pump light on the pumping light path, are controlled the radiation efficiency of THz wave with this.
Description of drawings
Fig. 1 is a structured flowchart of the present utility model.
Among the figure, 1-femtosecond pulse laser, 2-beam splitter, the 3-optical delay device, 3-1,3-2-planar transmit mirror, 4,5, the 7-plane mirror, the 6-chopper, 8, the 9-plano-convex lens, emission of 10-Terahertz and sonde body, 10-1-terahertz transmitter, 10-2, the 10-4-off-axis parabolic mirror, 10-3-pump light wave filter, the 10-5-terahertz detector, 11-data acquisition and disposal system, 11-1-planar transmit mirror, the 11-2-plano-convex lens, the 11-3-quarter-wave plate, 11-4-wollaston prism, 11-5-balance detection device, the 11-6-lock-in amplifier, the 11-7-computing machine.
Embodiment
Below in conjunction with accompanying drawing utility model is further described.
The utility model with the high-repetition-rate femto-second laser pulse as driving source, the femtosecond pulse light source can be titanium-doped sapphire self mode locked fs pulsed laser 1 or femtosecond laser amplifier, the pulse repetition rate of output is greater than 1KHz, pulse width is less than 100 femtoseconds, wavelength is the linearly polarized light of 820nm, and its polarization direction is parallel with the device base plate.Femtosecond laser is divided into two bundles through beam splitter 2: a branch of light is 70%, and another Shu Guangwei 30% is respectively as pump light and detection light.Pump light is focused on the terahertz transmitter 10-1 by plano-convex lens 9 then through 1050Hz chopper 6, produces the terahertz emission ripple according to the optical rectification principle.Wherein plano-convex lens 9 is placed on along the pump beam direction movably on the high accuracy platform, by mobile plano-convex lens 9, changes pump light and shines spot size on the terahertz transmitter.The terahertz emission ripple that produces focuses on the terahertz detector 10-5 through the 4f system that two off-axis parabolic mirrors of 10-2,10-4 constitute.Influence for fear of remaining pump light is surveyed the terahertz emission ripple need be provided with pump light wave filter 10-3 between two off-axis parabolic mirrors of 10-2,10-4.The precision of the optical delay line of computing machine 11-7 control motor driven is 0.1 μ m.Terahertz emission ripple and detecting light beam are coupled on the Terahertz crystal detection 10-5 by conllinear.Utilize linear electro-optic effect, the electric field of THz wave is carried out electro optic sampling, to survey the time-domain signal of tested THz ripple.Balance detection device 11-5 can eliminate exogenous noise.Do not adding under the situation of tested THz signal, rotation quarter wave plate 11-3 makes the balance detection device be output as zero, so can be in linear zone by prebias balance detection device.Terahertz emission and sonde body 10 place vacuum system, and vacuum system has avoided water in air to the influence that Terahertz absorbs, and has improved the measuring accuracy of substance spectra.The THz ripple time-domain signal that is detected can adopt the THz time-domain spectroscopic technology to obtain the measured matter spectrum signal, also can handle with wavelet transformation technique, obtains the time domain distribution character of material Te Zheng Spectrum.
Claims (1)
1. terahertz time-domain spectroscopy instrument based on optical rectification, it is characterized in that, this spectrometer comprises femtosecond pulse laser (1), be arranged on the beam splitter (2) and the optical delay device (3) of pulsed laser output terminal, be arranged on terahertz transmitter (10-1), terahertz detector (10-5) in the vacuum system; And data acquisition and disposal system (11); Between beam splitter (2) and terahertz transmitter (10-1), set gradually chopper (6), plane mirror (7) and plano-convex lens (9), off-axis parabolic mirror (10-2) is set afterwards at hertz transmitter (10-1); Constitute the pumping light path by femtosecond pulse laser (1), beam splitter (2), chopper (6), plane mirror (7), plano-convex lens (9) and terahertz transmitter (10-1); Between optical delay device (3) and terahertz detector (10-5), set gradually plane mirror (4), (5) and plano-convex lens (8) and off-axis parabolic mirror (10-4), between terahertz transmitter (10-1) and terahertz detector (10-5), pump light wave filter (10-3) is set; Constitute the detection light path by femtosecond pulse laser (1), beam splitter (2), optical delay device (3), plane mirror (4), (5) and plano-convex lens (8), off-axis parabolic mirror (10-4) and terahertz detector (10-5); Described data acquisition and disposal system (11) comprise planar transmit mirror (11-1) successively, plano-convex lens (11-2), quarter-wave plate (11-3), wollaston prism (11-4), balance detection device (11-5), lock-in amplifier (11-6), computing machine (11-7).
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200620025319 CN2874476Y (en) | 2006-02-10 | 2006-02-10 | Terahertz time domain spectral instrument based on optical rectification |
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| CN 200620025319 CN2874476Y (en) | 2006-02-10 | 2006-02-10 | Terahertz time domain spectral instrument based on optical rectification |
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| WO2009109098A1 (en) * | 2008-03-05 | 2009-09-11 | 清华大学 | Phase contrast imaging method and apparatus |
| 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 |
| CN101551273B (en) * | 2009-05-22 | 2010-11-17 | 中国科学院上海技术物理研究所 | System for automatically measuring spectral characteristics of terahertz wave range |
| CN102331403A (en) * | 2011-09-02 | 2012-01-25 | 东南大学 | Characterization method and test device for near-field terahertz THz time domain spectrum |
| CN102016548B (en) * | 2008-04-30 | 2012-09-05 | 浜松光子学株式会社 | Total reflection terahertz wave measurement device |
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| CN105241840A (en) * | 2015-09-17 | 2016-01-13 | 谢文科 | Detection method for full-ingredient granules Chinese herbal medicine flos rosae chinensis based on terahertz spectrum technology |
| CN105738315A (en) * | 2016-04-07 | 2016-07-06 | 绍兴文理学院 | Terahertz device for real-time monitoring of biomolecule composition and content and measuring method thereof |
| CN106872800A (en) * | 2017-02-15 | 2017-06-20 | 上海理工大学 | The terahertz time-domain electric field detecting system of graphene quantum dot Fluorescence Increasing |
| WO2017156653A1 (en) * | 2016-03-15 | 2017-09-21 | 上海理工大学 | Remote hazardous gas detection device based on terahertz waves |
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| CN108254071A (en) * | 2018-01-08 | 2018-07-06 | 华东师范大学 | A kind of direct detecting system of highly sensitive Terahertz of room temperature |
| CN108680500A (en) * | 2018-03-30 | 2018-10-19 | 莆田学院 | A kind of the terahertz time-domain spectroscopy instrument device and analysis method of miniaturization |
| 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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| CN110854653A (en) * | 2018-08-20 | 2020-02-28 | 苏州曼德特光电技术有限公司 | Broadband terahertz light source based on nonlinear optical rectification process |
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2006
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| WO2009109098A1 (en) * | 2008-03-05 | 2009-09-11 | 清华大学 | Phase contrast imaging method and apparatus |
| US8039803B2 (en) | 2008-03-05 | 2011-10-18 | Tsinghua University, Et Al. | Phase contrast imaging method and apparatus |
| CN102016548B (en) * | 2008-04-30 | 2012-09-05 | 浜松光子学株式会社 | Total reflection terahertz wave measurement device |
| US8415625B2 (en) | 2008-04-30 | 2013-04-09 | Hamamatsu Photonics K.K. | Total reflection terahertz wave measurement device |
| CN101551273B (en) * | 2009-05-22 | 2010-11-17 | 中国科学院上海技术物理研究所 | System for automatically measuring spectral characteristics of terahertz wave range |
| CN101782432B (en) * | 2010-03-16 | 2011-04-06 | 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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| CN102901717B (en) * | 2012-06-12 | 2014-10-29 | 中国科学院安徽光学精密机械研究所 | Laser-induced breakdown spectroscopy-based portable handheld soil heavy mental detection device |
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| CN103147744A (en) * | 2013-03-05 | 2013-06-12 | 中国石油大学(北京) | Spectral measurement device of horizontal well fluid flowing parameter |
| CN103147744B (en) * | 2013-03-05 | 2015-05-20 | 中国石油大学(北京) | Spectral measurement device of horizontal well fluid flowing parameter |
| CN104677497B (en) * | 2015-02-13 | 2017-01-11 | 上海理工大学 | Detection device and method for properties of terahertz waves |
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| CN108680500A (en) * | 2018-03-30 | 2018-10-19 | 莆田学院 | A kind of the terahertz time-domain spectroscopy instrument device and analysis method of miniaturization |
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| CN108981915A (en) * | 2018-06-05 | 2018-12-11 | 北京航空航天大学 | High field Terahertz spin transmitter and spectrometer |
| CN110854653A (en) * | 2018-08-20 | 2020-02-28 | 苏州曼德特光电技术有限公司 | Broadband terahertz light source based on nonlinear optical rectification process |
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