Photoinduced piezooptics effect in TeO2–Ga2O3 glasses

• The photoinduced changes in the TeO2–Ga2O3 glasses were found with respect to piezooptical effects.
• The maximal contribution gives the Ga–O4 structural fragments.
• The effects disappears after the switching off of the illumination.

We have found that during the bicolor illumination by two boicolor coherent wavelengths 1540 nm/770 nm there occurred substantial changes of the elastooptical non-diagonal coefficients at 1150 nm cw laser wavelength. They are maximal at power densities 400 … 500 MW/cm2. The studies have shown that the maximal effect exists for ultra-fast quenching glasses and occurs after the 1–2 min of the treatment. The switching off of the optical treatment leads to the disappearance of the photoinduced piezooptics at about 100 ms. The observed changes are explained within the photoinduced changes of the charge density distribution for the principal structural clusters within a framework of the DFT approach. The studies were done both for diagonal as well as off-diagonal piezooptical effect (POE) tensor components.

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