Vol. 42, Issue 3, pp. 467-472 (2012)

Abstract

Influence of CO₂ pulsed microsecond laser on two-photon absorption (TPA) at wavelengths of Nd:YAG (1060 nm and 1320 nm) and Er glass lasers (1540 nm) for As₂Se₂S glasses was studied. Dependence of the TPA versus the photoinducing power densities at wavelength 9.2 μm is studied. The highest values of the TPA β coefficient were achieved for perpendicular polarizations between the pumping and probing laser beams. The obtained values of TPA coefficients indicate a possibility of using the As₂Se₂S glasses as optically-operated IR laser limiters in a wide spectral range. The substantial role of anharmonic electron–phonon subsystem is demonstrated.