Investigation of the photoionization of Ce$^{3+}$ ions in YAG crystal by microwave resonant technique

Kinetic and spectral characteristics of the complex dielectric constant of Ce:YAG crystal under laser irradiation in $250$–$275$ nm spectral range are investigated. The lifetimes of free charge carrier and charge carriers, localized at the lattice defects (color centers), are estimated. It was established that photoconductivity signal of the sample is essentially caused by one-photon ionization processes from the $^{2}F_{5/2}$ ground state of Ce$^{3+}$ ions.