Study of wavelength-dependent diffraction properties of photorefractive volume holographic lenses for optical beams conversion

摘要

A new type of photorefractive volume holographic lenses for converting a plane wave to a lateral-spread spherical wave with different wavelength has been suggested, which are recorded at 632.8nm wavelength and reconstructed at 800nm wavelength. Using the coupled-wave theory, the wave-front conversion by photorefractive volume holographic lenses between spherical and plane waves is studied. The off-Bragg parameter values of the holographic lenses in the reconstruction process are analyzed. The dependence of diffraction efficiencies on the focal length of recording spherical wave and the geometric sizes of the photorefractive holographic lenses are discussed in detail. In addition the intensity distributions of the diffracted beam are analyzed also.