Anastigmatic spectrometer

Abstract

The invention discloses an anastigmatic spectrometer, which comprises an entrance slit, a collimating element, a dispersing element, a focusing element, a detecting device and an anastigmatic element, wherein the collimating element is arranged behind the entrance slit, and is used for converting light rays emitted from the entrance slit into parallel light; the dispersing element receives the parallel light emitted by the collimating element, and is used for dispersing the parallel light into a plurality of light beams spatially according to wavelengths; the focusing element receives the plurality of light beams emitted by the dispersing element, and is used for focusing the light beams after dispersing; the detecting device is placed on a focal plane of the light rays emitted by the focusing element, and is used for measuring intensity of a focusing spot at each wavelength; and the anastigmatic element is arranged in front of the detecting device, and is used for correcting astigmatism of the wavelengths to obtain an energy-concentrated focusing spot on the focal plane. Therefore, by implementing the anastigmatic spectrometer, astigmatism can be corrected, and collection efficiency and flexibility can be improved.

Description

technical field [0001] The invention relates to the technical field of spectral analysis, in particular to an astigmatism-eliminating spectrometer. Background technique [0002] Traditional non-imaging grating spectrometers usually have low requirements for astigmatism, mainly because astigmatism does not affect their spectral resolution; however, astigmatism will cause the energy concentration of the spectral lines on the focal plane to decrease, and the The point light source forms a thin strip of light on the focal plane, so less energy can be intercepted and collected when using a linear array detector. Moreover, due to the inconsistency of the astigmatism of different wavelengths, the degree of dispersion of the spectral lines is different, so the response of the spectrometer to different wavelength bands is inconsistent. [0003] At present, general-purpose non-imaging spectrometers usually only require spectral resolution, but not high requirements for astigmatism co...

AI Technical Summary

Problems solved by technology

In order to meet this requirement, it is necessary to change the focusing mirror into a complex toroidal mirror or change the planar grating into a curved grating design in the optical path structure, but this will greatly increase the processing difficulty of optical components, thereby increasing the cost of the spectrometer

In addition, the industry also proposed a solution to add a reflective cylindrical mirror to the optical path structure to eliminate chromatic aberration, but the disadvantage of this method is that adding a reflective mirror will cause the optical path to become larger, which is not conducive to the miniaturization of the spectrometer The spectrometer with the Chenier-Turner structure cannot incorporate the reflective cylindrical lens due to the compactness of the mechanism.

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