A Coma Elimination Broadband High Resolution Spectrometer

Abstract

The invention discloses a coma-elimination broadband high-resolution spectrometer, which includes an incident slit, a collimating mirror, an integrated grating, a two-dimensional focusing imaging mirror and a two-dimensional area array detector; the incident light is incident along the incident slit and passes through the The light hole in the center of the integrated grating is incident on the collimating mirror. The incident light is collimated by the collimating mirror and then enters the integrated grating along the coaxial optical path L1. After being diffracted by each sub-grating of the integrated grating, it is focused and imaged in two dimensions. Focused by the mirror, the diffracted light in the full spectrum region is incident on the focal plane of the two-dimensional area array detector along the coaxial optical path L2, and the off-axis angle of the L1 and L2 optical paths is zero. The invention does not have any mechanical displacement parts, realizes wide-spectrum, high-resolution, high-speed detection and analysis that completely eliminates the influence of coma aberration in the diffraction direction in the full spectrum region, and has high spectral resolution and working reliability.

Description

technical field [0001] The invention belongs to the technical field of optical and electronic devices, and in particular relates to a multi-channel broadband high-resolution spectrometer. Background technique [0002] A spectrometer is also called a spectrometer, and it is widely known as a direct-reading spectrometer. A device that measures the intensity of spectral lines at different wavelength positions with photodetectors such as photomultiplier tubes. It consists of an entrance slit, a dispersion system, an imaging system and one or more exit slits. The electromagnetic radiation of the radiation source is separated into the required wavelength or wavelength region by the dispersive element, and the intensity is measured at the selected wavelength (or scanning a certain waveband). Divided into monochromator and polychromator two. [0003] A monochromator is a photon energy and wavelength selector, a basic spectral analysis and measurement instrument, and has a wide ra...

AI Technical Summary

Problems solved by technology

Its main disadvantage is that the off-axis optical path will produce optical defects such as coma aberration that cannot be overcome

The causes of optical coma aberration and its effects have been studied in principle and experiments, but they have not been able to fundamentally eliminate their effects

Although the coma aberration error can be reduced at limited wavelength positions through special optical design, it cannot overcome the coma aberration effect at all wavelengths, or it must be at the expense of reducing light intensity efficiency, which is not conducive to the research and application of high-performance spectrometers

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