Coma-elimination broadband high-resolution spectrograph

A coma-elimination broadband high-resolution spectrograph, characterized by comprising incident slits, a collimating mirror, an integrated grating, a two-dimensional focus imaging mirror and a two-dimensional area array detector;

• the integrated grating consists of a plurality of sub-gratings, each sub-grating is disposed along a y direction perpendicular to an incident surface, each sub-grating has the same diffraction angle range in an x direction in which diffraction wavelengths are distributed, and a light through hole is formed in the center of the integrated grating;
• and
• incident light enters along the incident slits, passes through the light through hole in the center of the integrated grating and is incident to the collimating mirror, the incident light enters the integrated grating along a coaxial optical path L1 after collimation of the collimating mirror and is focused by the two-dimensional focus imaging mirror after diffraction of each sub-grating of the integrated grating, diffraction light of a full-spectrum region enters a focal plane of the two-dimensional area array detector for detection along a coaxial optical path L2, and off-axis angles of the L1 and the L2 are zero.