Light-induced scattering of holographic write-in process in LiNbO₃:Fe crystal

The light-induced scattering (LIS) in LiNbO₃:Fe crystal is experimentally studied in two kinds of typical geometrical configurations. The features of LIS were observed, and the dependence of LIS intensity on time was measured. It is shown that amplification of LIS for two incident beams whose polarized planes are parallel to c-axis is more easily produced than the beams whose polarized planes are orthogonal to c-axis. Symmetrical rotation axes of anisotropic and isotropic scattering cones caused by both configurations are in directions of ± c-axis and vertical of c-axis, respectively. The space distributions and time characteristics of scattered light intensity are interpreted. The signal to noise ratio can be improved when the geometry between two beams and crystal for holographic storage is properly chosen.