High-speed multi-width terahertz time-domain spectral imager

Abstract

The invention provides a high-speed multi-width terahertz time-domain spectral imager, aiming at problems in the prior art. Femtosecond laser pulse is divided, and certain time delay exists among pulses; then the sequence is divided into two ways, one way is used for generating a terahertz pulse sequence, and the other way is used for generating probe light pulse with an oblique leading edge through an oblique leading edge pulse light generating device, so that the one-time transient measurement of the terahertz pulse is realized; a signal acquiring and processing module is combined for imaging each probe pulse, so that the wave form information of each sub pulse of a plurality of terahertz pulse sequences can be obtained. According to the invention, the wave form information of a plurality of sub pulses of the terahertz pulse sequence is measured by a femtosecond pulsed laser device, a negative chirp pulse light generating device, a light splitting delay device, a terahertz generating device, an oblique leading edge pulse light generating device, an electrooptical effect crystal and the signal acquiring and processing module.

Description

technical field

[0001] The invention belongs to the technical field of terahertz time-domain spectral imaging system research, and in particular relates to a multi-frame terahertz transient time-domain spectral imager. Background technique

[0002] In recent years, terahertz time-domain spectroscopy technology has developed rapidly, and the use of terahertz time-domain spectroscopy technology to study ultrafast dynamics of materials has achieved rich results. This technique is suitable for the study of reproducible (reversible) ultrafast dynamics of materials, but it is powerless for single irreversible ultrafast dynamics of materials. The reasons are as follows: Most of the traditional terahertz time-domain spectroscopy systems detect the time-domain electric field signals of terahertz pulses based on the electro-optical effect. method, the reversible ultrafast process is measured multiple times point by point, so as to obtain the information of the complete material ultra...

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