Terahertz time-domain spectrograph based on femtosecond laser

Abstract

The invention discloses a terahertz time-domain spectrograph based on a femtosecond laser. The terahertz time-domain spectrograph has two modes of a transmission-type system and a reflection-type system. A terahertz wave generated by the focusing of the femtosecond laser is focused on a sample through a second off-axis parabolic mirror after being collimated by a first off-axis parabolic mirror, transmission or reflection mode measurement is carried out, the terahertz wave of the sample is focused on a detection crystal through a fourth off-axis parabolic mirror after being collected by a third off-axis parabolic mirror, and the terahertz time-domain spectrograph is obtained. The second off-axis parabolic mirror and the third off-axis parabolic mirror as well as a sample stand are integrated as a measuring module on a base plate. Two short-focus off-axis parabolic mirrors and a transmission sample stand are integrated into a transmission measuring module. Two long-focus off-axis parabolic mirrors and a reflection sample stand are integrated into a reflection measuring module. A five-dimensional adjusting device is adopted for clamping the first off-axis parabolic mirror and the fourth off-axis parabolic mirror, and is used for quickly recovering the optimum positions of the first off-axis parabolic mirror and the fourth off-axis parabolic mirror when a transmission mode or a reflection module is switched. The terahertz time-domain spectrograph disclosed by the invention is simple and quick in adjustment process, and integration and user operation of the terahertz time-domain spectrograph are facilitated.

Description

technical field [0001] The invention belongs to the field of optoelectronic technology, in particular to the field of terahertz time domain spectrum measurement. Background technique [0002] Electromagnetic spectrum technology, as a tool for human beings to understand the world, expands people's ability to observe the world. The human eye can appreciate the colorful world with the help of visible light, use infrared transformation spectroscopy and Raman spectroscopy to understand the properties of molecular vibration and rotation, and use X-ray diffraction technology to understand the structural information of substances. As an emerging spectroscopic technology, terahertz spectroscopy can complement infrared and Raman spectroscopy, and even play an irreplaceable role in some aspects, thus becoming a hot field of scientific research in this century. [0003] Terahertz waves have both spectral and transmission properties, and the inspection technology using terahertz waves h...

AI Technical Summary

Problems solved by technology

[0007] At present, when most terahertz time-domain spectrometers change the measurement method, the positions and attitudes of the four off-axis parabolic mirrors and the sample holder need to be adjusted, and the adjustment process is cumbersome and complicated, which is not conducive to the integration and user operation of the terahertz time-domain spectrometer

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