An experimental study to discriminate between the validity of diffraction theories for off-Bragg replay

Details An experimental study to discriminate between the validity of diffraction theories for off-Bragg replay An experimental study to discriminate between the validity of diffraction theories for off-Bragg replay

2012-03-26

arxiv.org/abs/1203.5714v1

Physics

Optics

11 pages, 8 figures, submitted to Applied Physics B

Scientific paper

We show that experiments clearly verify the assumptions made by the first-order two-wave coupling theory for one dimensional lossless unslanted planar volume holographic gratings using the beta-value method rather than Kogelnik's K-vector closure method. Apart from the fact that the diffraction process is elastic, a much more striking difference between the theories becomes apparent particularly in the direction of the diffracted beam in off-Bragg replay. We therefore monitored the direction of the diffracted beam as a function of the off-Bragg replay angle in two distinct cases: [a] the diffracted beam lies in the plane of incidence and [b] the sample surface normal, the grating vector and the incoming beam do not form a plane which calls for the vectorial theory and results in conical scattering.

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