Field-of-view-expanded spatial heterodyne interferometer optical system for Raman spectrum detection

Abstract

The invention provides a field-of-view-expanded spatial heterodyne interferometer optical system for Raman spectrum detection, and solves the problem that the small slit design of an existing Raman spectrometer limits the amount of light entering the spectrometer, the detection sensitivity and the spectral range. The system comprises a front collimating lens, a spatial heterodyne interferometer, a stripe imaging lens and a photoelectric detector which are sequentially arranged along a light path; the front collimating lens transmits incident exciting light to the spatial heterodyne interferometer in a parallel light form; the spatial heterodyne stem instrument enables parallel light to form an interference pattern at a localization plane, the fringe imaging lens enables the interference pattern to be imaged on the photoelectric detector, and the spatial heterodyne stem instrument comprises an optical filter, a beam splitter, a first view field broadening prism, a second view field broadening prism, a first grating and a second grating; the beam splitter is arranged on an emergent light path of the front collimating lens; and the first grating and the first view field broadening prism form a first optical unit, and the second grating and the second view field broadening prism form a second optical unit which are located in two emergent light paths of the beam splitter respectively.

Description

technical field [0001] The invention relates to spectrum detection technology, in particular to an optical system of an expanded field of view spatial heterodyne interferometer for Raman spectrum detection. Background technique [0002] Raman spectroscopy technology is a spectral inspection technology based on the Raman effect. It uses laser light to irradiate the sample to be tested, collects and analyzes the Raman scattered light generated by the sample, and realizes qualitative analysis and theoretical measurement of the sample. It is accurate, non-destructive and efficient. , obvious characteristic peaks, good reproducibility and no need for sample preparation. [0003] Currently commonly used Raman spectrometers mostly use grating spectrometers without moving parts. Such spectrometers require smaller slits for higher spectral resolution, and such small slit designs will limit the amount of light entering the spectrometer, limit the detection sensitivity of the system, ...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the technical problems that existing Raman spectrometers require smaller slits to obtain higher spectral resolution, and the design of small slits limits the amount of light entering the spectrometer, system detection sensitivity and spectral range, the present invention provides a Optical System of Extended Field Spatial Heterodyne Interferometer for Raman Spectroscopy

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