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

A terahertz time-domain and spectral imager technology, applied in the field of multiple terahertz transient time-domain spectral imagers

Active Publication Date: 2015-03-25
INST OF FLUID PHYSICS CHINA ACAD OF ENG PHYSICS
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Problems solved by technology

However, these methods can only realize the measurement of a single terahertz pulse, and cannot realize high-speed single-shot measurement of a terahertz pulse sequence containing multiple terahertz pulses.
In the terahertz spectroscopy study of the irreversible (i.e., single-shot) ultrafast dynamic process of materials, it is necessary to perform multiple consecutive transient measurements of the terahertz probe pulse. The above two methods are no longer applicable, and there is no effective method yet. Method to achieve multiple transient measurements of terahertz pulses

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[0027] The following non-limiting examples illustrate the invention.

[0028] refer to figure 1 as shown,

[0029] The working principle of the present invention is as follows: pass the femtosecond laser pulse through the negative chirped pulse light generating device to generate a pulse with negative linear chirp, and then pass through the splitting delay device to generate two femtosecond pulse sequences each with multiple sub-pulses ; One of the femtosecond pulse sequences generates a terahertz pulse sequence with multiple sub-pulses through a terahertz generating device (details: use a focusing lens to focus the femtosecond pulse sequence on a nonlinear crystal (such as ZnTe, GaP, etc.) to generate Terahertz pulse sequence); another femtosecond pulse sequence converts each sub-pulse into pulsed light with an inclined pulse front through the inclined front pulse light generating device, and enters the electro-optic effect crystal at the same time as the terahertz pulse seq...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/3586G01J11/00
Inventor 翟召辉孟坤朱礼国钟森城刘乔李江彭其先李泽仁
Owner INST OF FLUID PHYSICS CHINA ACAD OF ENG PHYSICS
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