Abstract 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:Gd3(AlxGa1-x)5O12 (x = 0.1, Yb:GAGG) and Nd:Gd3(AlxGa1-x)5O12 (x = 0.2, Nd:GAGG) laser crystals, including thermal conductivity (κ), thermal expansion coefficient (α) and specific heat at constant pressure (Cp) 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.

中文翻译：

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Yb:GAGG、Nd:GAGG 和 Nd:GGG 激光材料在低温下的热光学和光谱特性

摘要 固态激光器提供了一种有吸引力的方法来提高激光器性能，这得益于增益介质在低温下的热光和光谱特性的显着改进。此处，Yb:Gd3(AlxGa1-x)5O12 (x = 0.1, Yb:GAGG) 和 Nd:Gd3(AlxGa1-x)5O12 (x = 0.2, Nd:GAGG) 激光晶体的热光特性，包括热导率(κ)、热膨胀系数 (α) 和恒压比热 (Cp) 从 77 到 298 K 测量。此外，还计算了抗热震性参数。激光增益介质 Yb:GAGG、Nd:GAGG 和 Nd:Gd3Ga5O12 (Nd:GGG) 的光谱特性和荧光寿命在 77、150、298 K 下进行表征。