Accessory combined type terahertz time-domain spectroscopy system

Abstract

The invention relates to an accessory combined type terahertz time-domain spectroscopy system. A femtosecond pulse laser device radiates linearly polarized ultra-short pulse laser, the ultra-short pulse laser passes a laser plane mirror and then passes a half-wave plate and a polarization beam splitter, and pumping light and detection light which are perpendicular to each other are obtained; the pumping light enters a terahertz emission module, and parallel terahertz waves are radiated and enter a terahertz detection module through a testing device with a sample; the detection light passes a quarter-wave plate and reaches a time delay module, the detection light is returned along the original path after being reflected by a laser retroreflection mirror, then the detection light passes the time delay module and the quarter-wave plate again, the polarization state of the detection light is converted to be consistent with that of the pumping light, the detection light is reflected by the polarization beam splitter to a foldable mirror, and then the detection light is reflected by the laser plane mirror to enter the terahertz detection module. The testing device with the sample is designed for multifunctional accessories, so functions of transmission and reflection, parallel and focusing, attenuated total reflection, reflection measurement at any angle, imaging and the like can be easily switched and used.

Description

technical field [0001] The invention relates to an electromagnetic spectrum technology, in particular to an accessory-combined terahertz time-domain spectroscopy system. Background technique [0002] Terahertz waves have frequencies from 0.1 to 10THz (1THz=10 12 Hz) range of electromagnetic waves. Terahertz wave, like the infrared and microwave on its adjacent sides, can discover new technologies in detection and other aspects, so as to realize applications in many aspects such as materials, microelectronics, medical diagnosis, biological detection and communication. And the photon energy of 1THz is only 4.1meV. Compared with X-rays, terahertz waves will not cause damage to living tissue cells. Therefore, terahertz waves have attracted much attention in the analysis of material properties and the detection of biological samples. [0003] There are a variety of molecular rotation or vibration levels in the terahertz frequency band, and a large number of molecules have stron...

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the problem that the existing terahertz spectrometer cannot meet the multi-functional needs of the market, and proposes a combined terahertz time-domain spectroscopy system with accessories, which uses a spectrometer, a terahertz integrated control box, and a femtosecond pulse laser to control and acquire Data computer and multi-functional accessories are used in combination to realize simple switching between transmission and reflection, parallelism and focus, attenuated total reflection, reflection measurement at any angle, imaging and other functions

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