Real-time scattering type terahertz quasi-time-domain near field polarization spectrograph

Abstract

A real-time scattering type terahertz quasi-time-domain near field polarization spectrograph comprises a multimode laser module, an erbium-doped fiber amplifier, an optical fiber beam splitter, a photoconduction transmitting antenna, a polarization module, a focusing lens A, an atomic force microscope, a focusing lens B, an optical fiber extension module, a photoconduction receiving antenna and a phase-locked amplifier. The multimode laser module emits a multimode laser, the multimode laser passes through the erbium-doped fiber amplifier and is split into a pumping light beam and a detection light beam, the pumping light beam stimulates the photoconduction transmitting antenna module to radiate a quasi-time-domain terahertz signal, the terahertz signal is transmitted to an oscillating probe tip of the atomic force microscope, the detection light beam enters the photoconduction receiving antenna, and finally the signal is extracted and amplified through the phase-locked amplifier. The spectrograph has the advantages of being low in cost, small in size and not prone to hurting eyes, having the real-time performance, and the like, and can be widely applied to the field of super-resolution detection on terahertz signals in scientific research and industry.

Description

technical field [0001] The invention belongs to the technical field of spectrum testing, in particular to a real-time scattering terahertz quasi-time-domain near-field polarization spectrometer. Background technique [0002] The wavelength is between 3mm and 30μm, and the electromagnetic wave band between microwave and infrared is called the terahertz band. Usually, terahertz time-domain and frequency-domain spectrometers are used to detect this band. Among them, time-domain spectrometers that can simultaneously obtain terahertz pulse amplitude and phase information using coherent technology are the most widely used, and have been widely used in security inspections, non-destructive testing, and biomedicine. , chemical analysis, communications and national defense and other fields. However, these spectrometers are far-field spectrometers, which cannot bypass the diffraction limit. They can only perform terahertz spectrum analysis of a large number of molecular ensembles on ...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of the traditional terahertz time-domain near-field system, such as high price, large volume, slow speed, low resolution, suboptimal signal-to-noise ratio, and bandwidth limitation of the frequency-domain continuous wave near-field system. To provide a real-time scattering terahertz quasi-time domain near-field polarization spectrometer

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