Coupled-wave analysis of second-order Bragg diffraction. I. Reflection-type phase gratings

摘要

Coupled-wave analysis was applied to the problem of optical wave diffraction in a thick reflection-type phase grating in a condition of second-order Bragg regime. Within the approximation of two resonant waves in a medium with phase (refractive index) modulation, an analytical formula was derived for the diffraction efficiency. A shift of the maximum of a diffraction efficiency contour from the position determined by vector synchronism (second-order Bragg resonance) was detected.