A study of resistance of absorbing centres in a Pr2+:CaF2 crystal to high-power laser radiation

A change in the absorption coefficient of Pr²⁺:CaF₂ crystal in the spectral region from 530 to 1000 nm is found after irradiation by 30-mJ, 20-ns pulses from a repetitively pulsed 1.064-μm neodymium laser with a radiation power density of 500 MW cm^-2. After irradiation by 10⁵ pulses, the spectrum of the absorption coefficient variation Δα represents a broad band (~3000 cm^-1) centred at 710 nm with the maximum value of Δα = 1.1 cm^-1.