Photoinduced anisotropy and holographic recording in amorphous chalcogenides

Andris O. Ozols; Mara J. Reinfelde; Olli Nordman; Nina Nordman

doi:10.1117/12.425471

10 April 2001 Photoinduced anisotropy and holographic recording in amorphous chalcogenides

Andris O. Ozols, Mara J. Reinfelde, Olli Nordman, Nina Nordman

Proceedings Volume 4415, Optical Organic and Inorganic Materials; (2001) https://doi.org/10.1117/12.425471
Event: Advanced Optical Materials and Devices, 2000, Vilnius, United States

Abstract

The effect of photoinduced anisotropy and its application to vector hologram recording is reviewed focusing on amorphous chalcogenides. Vector holographic grating recording in amorphous As-S-Se(a-As-S-Se) films is experimentally studied and analyzed in comparison with scalar recording. It is holographically established that a linearly polarized 632.8 nm light produces photoinduced anisotropy and the chalcogen related D⁺, D^- center reorientation and generation mechanism is proposed. It is used to explain the observed peculiarities of vector recording in comparison with scalar recording based on photoinduced structural changes: much lower diffraction efficiency (4 X 10^-3% versus 4%), much larger specific recording energy [6.4 kJ/(cm²%) versus 20 J/(cm²%)], difference in spatial frequency response, instability (vector hologram lifetime of about two days versus practically permanent scalar holograms), the absence of hologram self-enhancement (present in scalar recording), near perfect reversibility. It is also experimentally found that vector holograms in a-As-S-Se films indeed reconstruct the signal wave polarization but only in the minus first diffraction order. It is also shown that photoinduced anisotropy also contributes to the scalar hologram recording in amorphous chalcogenides stimulating it by means of subbandgap readout light and enabling a subbandgap recording.

Citation Download Citation

Andris O. Ozols, Mara J. Reinfelde, Olli Nordman, and Nina Nordman "Photoinduced anisotropy and holographic recording in amorphous chalcogenides", Proc. SPIE 4415, Optical Organic and Inorganic Materials, (10 April 2001); https://doi.org/10.1117/12.425471

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