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We experimentally demonstrate photobleaching (PB) in Ge22As22Se56 thin films, when illuminated with a diode pumped solid state laser (DPSSL) of wavelength 671 nm, which is far below the optical bandgap of the sample. Interestingly, we found that PB is a slow process and occurs even at moderate pump beam intensity of 0.2 W/cm(2), however the kinetics remain rather different

iop conference series. materials science and engineering

Observation of photobleaching and intensity dependent kinetics in Ge22As22Se56thin films under sub-bandgap light illumination