Separate and simultaneous investigation of absorption gratings and refractive-index gratings by beam-coupling analysis: comment

Abstract

We correct a fundamental error occurring in the paper by F. Kahmann, [J. Opt. Soc. Am. A 10, 1562 (1993)], leading to a different value for the parameter $\phi$_p,0, i.e., the initial phase shift for the complex grating.