Laser Induced Piezo-Optical Effects in Chalcogenides

Laser stimulated elasto-optical effects in the proustite crystals (Ag3AsS3 ) under influence of coherent bicolor laser treatment with simultaneous illumination by low power He-Ne laser beams have been discovered for the first time. The changes of the piezo-optics have been explored during the first 3 – 5 min. of illumination by two bicolor coherent nanosecond laser beams at 1064 nm and 532 nm. The changes of the piezo-optical coefficients for the bicolor behaviors of the piezo-optical coefficients versus the photoinduced beam diameters and power densities are explored. Three different laser wavelengths (633 nm, 1064 nm, 3390 nm) have been applied for the probing of the photoinduced changes. The space profiles of the probing beams demonstrate an existence of the quasi-periodic gratings structure. It is shown that the probing beams play an effective role in the observed laser stimulated effects. The principal role here is played by Ag ions participating in the ionic conductivity which favor an internal dc-electric field and related photorefraction.