Linear and nonlinear transmission of Fe2+-doped ZnSe crystals at a wavelength of 2940 nm in the temperature range 20–220 °C

The linear and nonlinear transmission of Fe²⁺:ZnSe crystals is measured at a wavelength of 2940 nm in the temperature range 20 – 220 °C. It is found that, with increasing temperature from 20 °C to 150 – 220 °C, the transmission of Fe²⁺:ZnSe crystals decreases in the case of incident radiation with an intensity of ~5.5 MW cm^-2 and increases in the case of radiation with an intensity of 28 kW cm^-2. At a temperature of 220 °C, the linear transmission almost coincides with the nonlinear transmission. The transmission spectra of Fe²⁺:ZnSe crystals at temperatures of 22 and 220 °C in the wavelength range 500 – 7000 nm are presented.