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Terahertz wave band nanosecond time-resolved Fourier transform spectrometer

A Fourier transform, time-resolved technology, applied in the field of time-resolved Fourier transform spectrometers, can solve problems such as lack, and achieve the effect of improving time resolution

Inactive Publication Date: 2012-02-08
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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Problems solved by technology

For a long time, due to the lack of efficient THz sources and high-sensitivity detection methods, this spectral region has become the only underdeveloped region in the entire electromagnetic spectrum.

Method used

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  • Terahertz wave band nanosecond time-resolved Fourier transform spectrometer
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  • Terahertz wave band nanosecond time-resolved Fourier transform spectrometer

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Embodiment Construction

[0024] Further introduce below in conjunction with accompanying drawing the calibration method of the photoresponse spectrum of THz quantum well photon detector, the theoretical analysis method of high-speed response ability and its integration with existing spectrometer, and provide the verification of the key technology of the present invention, explain the content of the present invention feasibility.

[0025] First, simulate the time response characteristics of the THz quantum well photon detector: solve the Schrödinger equation and Poisson equation simultaneously to obtain the energy level position and wave function, and then calculate the electron-phonon, electron-impurity according to the Fermi golden rule scattering. The Monte Carlo method is used to solve the semiclassical Boltzmann electron transport equation, and the characteristic response time of the THz quantum well photon detector is calculated. Among them, the Monte Carlo method is used to solve the Boltzmann ...

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Abstract

The invention discloses a terahertz wave band nanosecond time-resolved Fourier transform spectrometer, comprising a michelson interferometer, a sample room arranged at an input end of the michelson interferometer, a THz quantum well detector arranged at an output end of the michelson interferometer, a THz source, a modulating signal module, a phase-locked amplifier and a control computer. The phase-locked amplifier is connected with the THz quantum well detector; the control computer is connected with the phase-locked amplifier and is further connected with a movable mirror of the michelson interferometer to control the position of the movable mirror so as to move the fixed step length of the movable mirror; and the THz source and the modulating signal module emit a THz laser with a disturbing signal to the sample room, transmit the disturbing signal to the phase-locked amplifier, and transmit the disturbing signal which is amplified by the phase-locked amplifier to the control computer. The existing DTGS-PE and Si pyroelectric detector is replaced by the THz quantum well detector, so that the time resolution of the Fourier transform spectrometer within the THz wave band is greatly improved.

Description

technical field [0001] The invention relates to a time-resolved Fourier transform spectrometer in the terahertz band, in particular to a time-resolved Fourier transform spectrometer in the terahertz band with nanosecond time resolution. Background technique [0002] Terahertz (THz) wave refers to the frequency in the electromagnetic spectrum from 100GHz to 30THz (1THz=10 12 Hz), the corresponding wavelength is from 3 millimeters to 10 micrometers, which is the region of the electromagnetic spectrum between millimeter waves and infrared light. For a long time, due to the lack of efficient THz sources and high-sensitivity detection methods, this spectral region has become the only underdeveloped region in the entire electromagnetic spectrum. [0003] One of the core components of the application of THz technology is the THz detector. At present, the relatively mature THz detectors include electro-optic crystal detectors widely used in THz time-domain spectroscopy; LiTaO-base...

Claims

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Application Information

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IPC IPC(8): G01J3/45
Inventor 郭旭光曹俊诚谭智勇韩英军黎华
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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