In the paper an approach to improve diffraction efficiency of a transmission concave holographic grating for a flat-field spectrograph is presented. The proposed method is based on numerical optimization of a merit function. Each iteration of the procedure includes definition of the grating recording parameters and the spectrum position from conditions of aberration correction, estimation of the diffraction efficiency by means of the Kogelnik coupled-wave theory equations, and checking boundary conditions. It’s shown on a certain example that the technique allows to obtain high spectral resolution and increase the diffraction efficiency. Modeling results and comparison with accurate RCWA computation are provided as well.

Date Published: 26 March 2013
PDF: 8 pages
Proc. SPIE 8787, Optical Technologies for Telecommunications 2012, 87870B (26 March 2013); doi: 10.1117/12.2019728

Published in SPIE Proceedings Vol. 8787:
Optical Technologies for Telecommunications 2012
Vladimir A. Andreev; Vladimir A. Burdin; Albert H. Sultanov; Oleg G. Morozov, Editor(s)