Dynamic grating recording in semiconductor CdF_2 : Ga, Y

Cadmium fluoride codoped with Ga and Y is characterized as a medium for phase grating recording. The dependence of the three-dimensional grating diffraction efficiency on the intensity of the recording light, on the polarization of the recording light, on the fringe contrast, and on the spatial frequency of the fringe was measured together with the dynamic characteristics (grating decay time and grating buildup time). The crystal behaves as a χ(3) medium with its refractive-index change depending on linear intensity and with nearly exponential buildup–decay temporal characteristics for moderate intensities of the green recording light at room temperature.