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Terahertz scanning system based on optical fiber delay line and detection method

A technology of optical fiber delay line and terahertz detector, which is applied in the field of terahertz scanning detection, can solve the problems of slow scanning speed, etc., and achieve the effects of small size, strong practicability, convenient system integration and miniaturization

Inactive Publication Date: 2019-04-02
绵阳瑾源信息技术有限公司
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a terahertz scanning system and detection method based on an optical fiber delay line, which solves the problem of slow scanning speed of traditional mechanical precision displacement stages, thereby significantly improving signal measurement efficiency and reducing system volume

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  • Terahertz scanning system based on optical fiber delay line and detection method

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Embodiment

[0028] The operation method of the terahertz scanning system based on the fiber delay line is as follows:

[0029] (a) Using a power meter to monitor the output power of the femtosecond laser 1, and adjusting the output power of the femtosecond laser 1 to a suitable position according to the requirements of the terahertz radiation source 4;

[0030] (b) passing the femtosecond laser output by the femtosecond laser 1 through a chopper 2, and the frequency of the chopper 2 is set to, for example, 3kHz;

[0031] (c) Using the beam splitter 3 to divide the femtosecond laser beam passing through the chopper 2 into two beams, one beam is used as the pumping optical path A1 to excite the terahertz radiation source 4 to generate a terahertz pulse signal. Another beam enters the fiber delay line 5 as the detection optical path A2;

[0032] (d) The terahertz pulse emitted by the terahertz radiation source 4 is focused and incident on the terahertz detector 6, and the detection light af...

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Abstract

The invention discloses a terahertz scanning system based on an optical fiber delay line and a detection method, and belongs to the field of terahertz scanning detection technology. The terahertz scanning system comprises a femtosecond pulsed laser, a chopper, a beam splitter, a terahertz radiation source, a fiber delay line, a terahertz detector, a computer, and a lock-in amplifier. An external signal source and the terahertz radiation source, the optical fiber delay line and the computer, the chopper and the lock-in amplifier, the terahertz detector and the lock-in amplifier, the lock-in amplifier and the computer are respectively connected through data lines. The rest part is the optical path using free space transmission or fiber-coupled transmission. An optical fiber-based time delaydevice can realize optical delay without moving elements by electronic control, and the scanning speed is high. The optical fiber delay line is small in size and convenient to use, and easy to integrate and miniaturize.

Description

technical field [0001] The invention belongs to the technical field of terahertz scanning detection, and relates to a fast scanning detection method of a terahertz pulse signal, in particular to a terahertz scanning system and detection method based on an optical fiber delay line, which are used for signal detection in a terahertz time-domain spectroscopy system. Background technique [0002] As a typical representative of terahertz application technology, terahertz time-domain spectroscopy technology has important application prospects in the field of material detection. In the traditional terahertz time-domain spectroscopy system, the acquisition of the terahertz pulse signal is to scan the signal by controlling the delay of the femtosecond laser through a mechanical precision displacement stage. The mechanical precision translation stage has the following disadvantages: the mechanical precision translation stage is large in size, which is not conducive to system integrati...

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Application Information

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IPC IPC(8): G01N21/3586G01J3/06G01J3/28
CPCG01J3/06G01J3/2889G01J2003/065G01N21/3586
Inventor 丁宇洁应全红徐德王艳茹冉铮惠白德奎
Owner 绵阳瑾源信息技术有限公司
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