Terahertz difference frequency source remote active detection system

Abstract

The present invention discloses a terahertz difference frequency source remote active detection system. The system comprises a high-power 1064nm laser, an optical parametric oscillator, a beam delay line, half wave plates, a polarizing beam splitter prism, a gallium selenide crystal, terahertz lenses, a terahertz reflector and a terahertz detector. According to the terahertz difference frequency source remote active detection system of the invention, a high-power terahertz difference frequency source radiation technique is adopted, the quasi-parallel emission-echo focusing technique of the terahertz lens group is used in combination, and therefore, the active detection of the terahertz reflected / scattered signals of a long-distance target can be realized. The terahertz difference frequency source remote active detection system of the invention has the advantages of wide coverage band, high frequency band compatibility, simple structure, high signal-to-noise ratio, long detection distance and the like, and can work under room temperature.

Description

technical field [0001] The invention discloses a long-distance active detection system for a terahertz difference frequency source. The system utilizes a high-power optical terahertz difference frequency radiation source and lens assembly optical means to realize the active detection of a long-distance terahertz target. Background technique [0002] Terahertz wave, as an electromagnetic spectrum resource that has not been fully developed by human beings, is different from infrared and millimeter waves. It has unique spectral characteristics, which are embodied in its low photon energy and safety; it has large bandwidth and is convenient for large-capacity high-definition real-time communication. ; For the penetration of nonpolar molecules, it can perform terahertz perspective imaging; it has fingerprint absorption characteristics for many substances, and can be used for material composition calibration. Terahertz technology has become one of the most important key technologi...

AI Technical Summary

Problems solved by technology

Regarding terahertz long-distance detection technology, it is basically still in the initial research stage at present, mainly using electronic frequency-multiplied terahertz radiation sources as active emission sources (such as the MMAOP architecture patented for terahertz radar and communication systems, patent number: CN201410094418 .3; a ground terahertz radar system for cloud measurement, application number: CN201510040930.4), but the effective working frequency band of this type of terahertz radiation source is limited to the low frequency range (below 1THz), and cannot be extended to the high frequency band ( 1THz or more)

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