Tunable spatial heterodyne spectrometer considering single light splitting, single rotating shaft and symmetrical light path

Abstract

The invention discloses a tunable spatial heterodyne spectrometer considering a single light splitting element, a single rotating shaft and a symmetrical light path, relates to the technical field of interference spectrum instruments, and solves the problem that the design of the symmetrical light path, the design of a single light splitting element and the design of a single tuning rotating shaft cannot be considered at the same time. One arm is reflected by the ridge reflector, reflected by the right-angle reflecting prism, dispersed by the dispersion element and returned to the non-polarization beam splitting cube in sequence, and the other arm is reflected by the right-angle prism reflector, reflected by the right-angle reflecting prism and dispersed by the dispersion element in sequence; the two arms of light paths are combined through a non-polarization beam splitting cube, and are converged on an area array detector through telecentric lenses of the two parties; two arms of light paths which are reflected by the right-angle reflecting prism and then are incident on the dispersion element are both parallel to a straight line L. The wavelength of light parallel to the straight line L in reflected light reflected by the dispersion element in a dispersion mode can be changed through rotation of the rotating shaft. According to the invention, single light splitting, single rotating shaft and symmetrical light paths are considered.

Description

technical field [0001] The invention relates to the technical field of interference spectroscopy instruments, in particular to a tunable spatial heterodyne spectrometer taking into account single light splitting, single rotation axis and symmetrical optical path. Background technique [0002] Spectrum refers to the pattern formed by sequentially arranging the wavelength or frequency of polychromatic light after splitting. Spectral range and spectral resolution are key indicators for judging the spectral performance of a spectrometer: the larger the spectral range, the wider the detected spectrum; the higher the spectral resolution, the finer the detected spectrum. Both high spectral resolution and wide spectral range mean more spectral bands and richer spectral information. Therefore, it is meaningful to simultaneously realize a larger spectral range and a higher spectral resolution. [0003] Tunable spatial heterodyne spectroscopy (TSHS) is a new technology developed in r...

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