Holographic Grating Aberration Correction for a Rowland Circle Mount I

The aberration coefficients of a concave holographic diffraction grating, derived using Fermat's principle, are used to correct the aberrations of a Rowland circle spectrograph when the slit and grating recording sources lie on the Rowland circle. The correction at two wavelengths of primary astigmatism or primary coma is demonstrated under this constraint.