Mini Terahertz Time-Domain Spectroscopy Test System

Abstract

The invention relates to a mini terahertz time-domain spectroscopy testing system. The system is characterized in that laser radiated by a laser source is reflected through a laser plane mirror and then passes through half wave plate and a polarizing beam splitting cube to obtain mutually-vertical pump laser and probe laser; the pump laser sequentially passes through a first quarter wave plate, a first time delay module, a first quarter wave plate and the polarizing beam splitting cube and then enters a terahertz emission module; the radiated parallel terahertz wave enters a terahertz probing module through a testing device with a sample; the probe laser sequentially passes through the laser plane mirror, a second polarizing beam splitting cube and a second quarter wave plate and then arrives at a second time delay module; the probe laser at the second time delay module is reflected to return through the same way and then sequentially passes through the second time delay module, etc. to enter the terahertz probing module. According to the system, the terahertz wave absorbing and chromatic dispersion properties of different samples are utilized, and on that basis, the terahertz time-domain spectroscopy information of different samples to be tested can be obtained by calculating according to the probed terahertz signals, so as to realize the function of detecting different samples.

Description

technical field [0001] The invention relates to an electromagnetic spectrum testing system, in particular to a miniature terahertz time-domain spectrum testing system, which belongs to the technical field of electromagnetic spectrum testing. Background technique [0002] In the 21st century when international relations are becoming more and more tense, the detection of explosives, prohibited drugs, weapons and other dangerous goods is becoming more and more important. The development of dangerous goods detection systems has become the primary task of national defense related research and development projects. With the rapid development of science and technology in recent decades, terahertz time-domain spectroscopy has been proved to be an innovative imaging technique. The spectral information of terahertz waves can provide the optical amplitude and phase information of most dangerous goods and related compounds, and has broad application prospects in the identification of ex...

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the problems that current terahertz time-domain systems usually have relatively large volume, complex structure, high cost, lack of flexibility and mobility, and are easily affected by the environment. A miniature terahertz time-domain spectrum detection system is proposed. Small, simple structure, flexible mobility, free switching of test modes, high signal-to-noise ratio, and terahertz imaging function, good imaging effect, can be widely used in scientific research and industrial terahertz spectrum testing and imaging

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