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All-fiber terahertz quasi-time-domain real-time spectrograph

A punctual time-domain, all-fiber technology, applied in the field of terahertz spectrum testing, can solve problems such as information limitation and increase system complexity, and achieve the effect of reducing price and volume without damaging eyes

Inactive Publication Date: 2016-02-17
CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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Problems solved by technology

But this system only detects a single frequency component, and the information obtained is severely limited
Moreover, in order to ensure accurate phase information, a set of accurate laser frequency stabilization system is essential, which increases the complexity of the system

Method used

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Embodiment Construction

[0015] Hereinafter, the preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings; it should be understood that the preferred embodiments are only for illustrating the present invention, not for limiting the protection scope of the present invention.

[0016] The all-fiber terahertz quasi-time domain real-time monitoring spectrometer is a coherent detection device that integrates terahertz time-domain spectroscopy and frequency-domain difference frequency detection technology. By measuring the quasi-time domain waveform of the terahertz pulse of the sample, the amplitude and the amplitude of the terahertz pulse can be obtained at the same time. Phase information, and after fast Fourier transform, the spectral information, absorption coefficient, refractive index and other parameters of the sample can be obtained. The space light is transferred into the optical fiber for transmission, eliminating many optical components f...

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Abstract

The invention discloses an all-fiber terahertz quasi-time-domain real-time spectrograph which comprises a multi-mode laser system, a multi-mode laser optical fiber transmission system, a terahertz transmitting module and a terahertz receiving module. The multi-mode laser system outputs multi-mode laser light surrounding a center frequency, and the adjacent longitudinal mode frequency difference is a constant value equal interval. The multi-mode laser light is divided into two paths of light signals through the multi-mode laser optical fiber transmission system, wherein one path of light signals are input into a photoconduction transmitting antenna, and the other path of light signals are input into a photoconduction receiving antenna. The all-fiber terahertz quasi-time-domain real-time spectrograph is low in cost, achieves all-fiber integration, is portable and rapid, has real-time capability, and can be widely and actually applied in the industrial field. The quasi-time-domain system has the advantages of replacing expensive femtosecond laser and a fixed free space terahertz spectrum system, low-cost multi-mode laser is adopted, all-fiber integration is achieved, the signal to noise ratio is high, and the spectrograph is portable and can be used in the typical field of partial substitution terahertz time-domain spectroscopy and frequency domain continuous wave spectrographs.

Description

Technical field [0001] The present invention relates to the technical field of terahertz spectrum testing, in particular to the field of terahertz time domain spectroscopy and a portable, low-cost, real-time all-fiber terahertz quasi-time domain real-time spectrometer. Background technique [0002] The wavelength is between 3mm and 30um, and the spectrum ranges from 100GHz to 10THz. The electromagnetic wave band between microwave and infrared is called terahertz band. The spectrum information detected by the terahertz spectrometer can simultaneously obtain the optical amplitude and phase information of the substance. It has been widely used in the fields of security inspection, non-destructive testing, biomedicine, chemical analysis, communications and national defense, especially in explosives, illegal drugs, weapons There are broad application prospects in subdivision fields such as identification, non-destructive testing, and cell and molecule. The traditional terahertz spect...

Claims

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Application Information

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IPC IPC(8): G01N21/3586
CPCG01N21/3586
Inventor 侯颖杨忠波王化斌魏东山崔洪亮杜春雷
Owner CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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