Nonlinear Optical Features of Cr 4+ : YAG Transparent Ceramics for all Solid‐State Laser

ABSTRACT Chromium‐doped yttrium aluminum garnet (Cr 4+ : YAG) transparent ceramics (TCs) have significant applications in 1 µm passively Q‐switched (PQS) lasers. The issues of low conversion rate of Cr 4+ ions and the impact of different Cr doping concentrations on the PQS lasers are key problems that need to be resolved. In this paper, the energy band structures and optical absorption spectra of Cr: YAG were calculated by first principles. The different doping concentrations of Cr 4+ : YAG TCs