Study On High Resolution Interference Imaging Spectroscopy

The spatial and spectral information of the objects can be detected in the Imaging spectroscopy simultaneously. It is widely applied in many fields, such as materials analysis, military reconnaissance, aerospace and so on. In recent years, a number of high-resolution imaging spectrometer technologies have a complex system, data reconstruction volume, lower flux and other shortcomings, while improving spectral resolution. It can be achieved to realize a high spectral resolution in a narrow spectral range of hyperfine spectrum detection by adding the dispersive element in the lateral shearing interferometer in order to combine dispersion and interferometry. It has the advantages of high spectral resolution and high flux.This paper based on the basic principle of the traditional high-throughput interference imaging spectrometer system analyzes the interference imaging spectrometer under the dispersion effect. The idea of optical path squeezing is proposed and the spectral resolution formula and wave number formula are given. We choose a double diffractive gratings added in the Sagnac transverse shear splitter and design the high-resolution interferometric imaging spectrometer system. Then the main geometric parameters of the system are designed using the optical path squeezing restrictions. The algorithms of spectrum recovery are researched and simulated to verify the accuracy of boosting the spectral resolution. Finally, the experiments of lasers and imaging spectroscopy detection are set up. The results show that the system can achieve the sub-nanometer narrowband spectrum recovery, and also show that the idea of optical path squeezing can be used as guidelines of general design of the interference imaging spectroscopy with dispersion effect.