Method for expanding application bandwidth of spatial heterodyne interferometer

Abstract

The invention discloses a method for expanding the application bandwidth of a spatial heterodyne interferometer. An optical filter is arranged in parallel optical paths with a tiny view field angle, wherein the optical paths are emitted by a collimation lens; the bidirectional optical filter is divided into two parts in a grating scribed line direction; different film coating parameters respectively and correspondingly cut off the optical spectrums of a long wave and a short wave of the base frequency lamda0 application bandwidth of the spatial heterodyne interferometer; and the optical spectrums are zoomed in proportion by an imaging lens to finally obtain an optical spectrum interferogram on in negative direction and the positive direction of the base frequency on a detector. Compared with the traditional spatial heterodyne interferometers, the spatial heterodyne interferometer disclosed by the invention is characterized in that target band width is effectively monitored to multiply on the premise of guaranteeing the constant spectral resolution. The technical problem that the number of the detector image element needs to be increased or the spectral resolution needs to be lowered because the spatial heterodyne interferometer increases the effective application bandwidth in the background prior is solved.

Description

technical field

[0001] The invention relates to the field of optics, in particular to a method for extending the application bandwidth of a spatial heterodyne interferometer. Background technique

[0002] The spatial heterodyne spectrometer can obtain extremely high spectral resolution in a narrow spectral range, and increasing its effective bandwidth can be achieved by increasing the number of detector pixels or reducing the spectral resolution.

[0003] The spatial frequency of the detector remains unchanged, the number of pixels is increased to expand the bandwidth, and the zoom ratio of the imaging lens and the grating density remain unchanged, the effective aperture of the imaging and collimating lens matched by the spatial heterodyne interferometer is doubled, This increases the size of the entire system structure. Due to the increase of the clear aperture of the front and rear lenses, the aberration increases, and the lens needs to be redesigned and optimized. At th...

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