Spectrum broadening method and device based on digital micromirror device (DMD)

Abstract

The invention belongs to the field of astronomical optical observation, and particularly relates to a spectrum broadening method and a spectrum broadening device based on a digital micromirror device(DMD). The spectrum broadening method comprises the steps of: firstly, subjecting a target spectrum to chromatic dispersion to a row or column direction of the digital micromirror array DMD, wherein the row or column direction of the DMD is consistent with a row or column direction of a detector; secondly, segmenting the spectrum subjected to chromatic dispersion along row pixels or column pixelsof the detector according to different spectral bands by means of the digital micromirror device DMD and reflecting the segmented spectral bands to different positions on the same plane, so as to realize spectrum broadening; thirdly, compressing and collimating the segmented different spectral bands to enter into an interference module to obtain interference fringes; and finally, performing secondary chromatic dispersion on the interference fringes in the row or column direction of the detector to realize high-precision light splitting, so as to obtain high-resolution spectral interference fringes. The spectrum broadening method and the spectrum broadening device realize the spectrum broadening of the detection system while avoiding the problems of fringe bending, contrast reduction and the like caused by cross chromatic dispersion, and solves the problem that reflected surfaces are not on the same image plane during spectral narrow band segmentation under the condition of multi-targetdetection by adopting an image segmentation device broadening method.

Description

technical field [0001] The invention belongs to the field of astronomical optical observation, and in particular relates to a method and device for broadening a spectrum based on a digital micromirror array DMD. Background technique [0002] After the polychromatic light is split by a dispersion system (such as a prism, a grating), the pattern of the dispersed monochromatic light arranged in sequence according to the wavelength (or frequency) is called the optical spectrum, or the spectrum for short. Spectral measurement is an important means of obtaining material information, and its application scope covers high-energy physics, astronomy, environment, atmospheric physics, marine science, life science, chemical industry, materials, agricultural science and other fields. [0003] Interferometric spectroscopy is a measurement method that combines optical interferometry and spectroscopy. It is widely used in the detection of extrasolar star features, exoplanet detection, weak ...

AI Technical Summary

Problems solved by technology

While avoiding the problems of fringe bending and contrast drop caused by cross dispersion, the spectral broadening of the detection system is realized, and the image slicer broadening method is solved. In the case of multi-target detection, the reflective surface is not on the same image plane when the spectrum is narrow-band sliced. The problem

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