Abstract
The diffraction efficiency and angular selectivity of photorefractive volume holograms, the important performances for multiplexed holograms, are strongly affected by material properties and recording conditions. In this paper the diffraction efficiency and angular selectivity of reflection gratings in photorefractive crystals are studied by means of the coupled wave theory, with respect to the recording geometry and polarization states of recording beams. The result shows that, although the angular selectivity of reflection gratings recorded with the s- polarized beams is slightly worse than that written with p-polarized ones, the diffraction efficiency of s-polarized beams is generally higher and more uniform than that of p-polarized beams over all accessible angular ranges. The theoretical results are also verified by experimental measurements. The s-polarized beams would be more suitable for recording and readout of reflection-type holograms in photorefractive crystals.
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