Holographic self-amplification in amorphous As-Se semiconductor films

Holographic self-amplification in amorphous As55Se45 and As65Se35 films has been studied. Results on this amplification over a wide range of initial diffraction efficiencies 10(-5)% < eta(0) < 1% are reported. The degree of amplification increases with decreasing eta(0). At fixed values of eta(0) and of the sample thickness, the maximum self-amplification corresponds to a period Lambda = 2. 0 mu m of the grating hologram. An increase in the diffraction efficiency in the dark has been observed for the first time in As-Se films.