Double-grating beam splitting system packaging structure stable in stray light eliminating ability

Abstract

The invention provides a double-grating beam splitting system packaging structure stable in stray light eliminating ability, and belongs to the technical field of grating beam splitting. The packaging structure aims to solve the problems of existing grating spectrometer outer shell package. According to the packaging structure, a first reflecting mirror and a ruling grating, a second reflecting mirror, a third reflecting mirror and a ruling grating, and a fourth reflecting mirror are packaged in a broadband rough absorbing cavity, a broadband fine absorbing cavity, a narrow-band rough absorbing cavity and a narrow-band fine absorbing cavity respectively. A first parallel diaphragm is arranged at an intersection position of a separation plate of the broadband rough absorbing cavity and a separation plate of the broadband fine absorbing cavity, a first converging diaphragm is arranged at an intersection position of a separation plate of the broadband fine absorbing cavity and a separation plate of the narrow-band rough absorbing cavity, a second parallel diaphragm is arranged at an intersection position of a separation plate of the narrow-band rough absorbing cavity and a separation plate of the narrow-band fine absorbing cavity, a second converging diaphragm is arranged at a light path final out-shooting position of the narrow-band fine absorbing cavity, and light eliminating traps are arranged on a primary scattering face and a secondary scattering face of a double-grating beam splitting system. Black coating coats the inner surfaces of the cavities and the outer surfaces of the light eliminating traps.

Description

technical field [0001] The invention relates to a package structure of a dual-grating light-splitting system with stable stray light elimination capability, and belongs to the technical field of grating light-splitting. Background technique [0002] With the rapid development of aerospace technology, the sensitivity of high-resolution monochromators and spectrometers has been greatly improved, and they put forward higher requirements for the stray light suppression level of the system. The harmfulness of stray light is to reduce the contrast of the image plane and the value of the modulation transfer function, the energy distribution is chaotic and even stray light spots are formed, which reduces the signal-to-noise ratio of the target signal and affects the measurement accuracy. [0003] Most of the existing high-precision monochromators are designed with a double-grating and four-mirror system. The theoretical spectral resolution of this structure is very high. The main so...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that the light extinction ability of the package structure of the existing grating spectrometer shell decreases greatly with the attenuation degree of the black paint absorptivity, the present invention provides a double grating spectroscopic system package structure with stable stray light extinction ability

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