Linear holographic recording at 514 nm in amorhpous As2S3

It is shown that the linear recording of holographic gratings can be obtain ed at 514 nm in the amorphous arsenic trisulfide films. While strong nonlin earity was observed during recording at room temperature, these effects wer e eliminated when the recording was performed at temperatures below 275 K. To verify the linearity of the recording, the first- and second-order diffr action of a recorded grating were monitored during exposure. Since temperat ure appeared to be an important factor in obtaining the linearity of the re cording, the experimental results support our qualitative model in which ph otoinduced structural changes, the main recording process, are deteriorated by a competitive relaxation process. (C) 2000 American Institute of Physic s. [S0003-6951(00)01107-4].