Thermo-optic and spectroscopic properties of Yb:GAGG, Nd:GAGG and Nd: GGG laser materials at cryogenic temperature

摘要

The solid-state lasers provide an attractive approach to enhance the laser performance benefitting from significant improvements in both thermo-optic and spectroscopic properties of the gain mediums under cryogenic temperature. Here, thermo-optic properties of Yb:Gd-3(AlxGa1-x)(5)O-12 (x = 0.1, Yb:GAGG) and Nd:Gd-3(AlxGa1-x)(5)O-12 (x = 0.2, Nd:GAGG) laser crystals, including thermal conductivity (kappa), thermal expansion coefficient (alpha) and specific heat at constant pressure (C-p) were measured from 77 to 298 K. In addition, the thermal shock resistance parameters were also calculated. The spectroscopic properties and the fluorescence lifetimes of laser gain mediums Yb:GAGG, Nd:GAGG and Nd:Gd3Ga5O12 (Nd:GGG) were characterized at 77, 150, 298 K.