Abstract:
The dependence of nonlinear transmission in Co2+-doped ZnSe crystals at a wavelength of 1.54 μm on the incident energy density is studied under the SZnSe-SCoSe-LZn-V equilibrium conditions. The obtained results suggest that the residual losses in the crystal at high incident energy densities are not related to absorption from the excited state but are caused by losses appearing probably during sample growing and doping. The saturation energy and the ground-state absorption cross section are determined Es=0.12 ± 0.03 J cm-2 and σ = (11 ± 2) × 10-19 cm2.