ON THE DYNAMIC SELF-DIFFRACTION IN METHYLENE BLUE-SENSITIZED GELATIN

Dynamic self-diffraction processes have been observed and analysed for methylene blue-sensitised water-swollen gelatine (MBSG), A degenerate two-wave mixing experiment performed on thick samples of MBSG with 10 mW, 632.8 nan wavelength He Ne laser right allowed for the formation of phase- and amplitude-transient holographic gratings, Single-beam pr opagation characteristics through MBSG were measured with Mach-Zehnder interferometer, The observed energy transfer between the writing beam s in the two-beam coupling experiment and the considerable temporal os cillations of diffraction efficiency are explained by simple formulae, Two processes are considered: the time-dependent phase shift between the writing beams and the transverse self-phase modulation effects (se lf-focusing and interference ring formation).