Spectroscopic analysis of Nd 3+ : Gd 3 Al x Ga 5−x O 12 garnet crystal

We report a complete spectroscopic analysis of Nd3+-doped Gd3AlxGa5−xO12 garnet crystal (Nd:GAGG), including absorption and emission spectra at low and room temperatures, excitation spectra showing the multisite structure of the host crystal, and temperature dependence of the lifetime of the F324 manifold. We also report the emission cross sections for the transitions from the F324 manifold and a Judd–Ofelt analysis with the calculation of the spontaneous emission probabilities and the radiative branching ratios.