We demonstrate the laser performance of a LD end-pumped Er:YSGG crystals with different doping concentrations comparatively. The experimental results show that 30 at. % Er:YSGG crystal with dimensions of 2 mm ×2 mm ×8 mm has the best laser output. In continuous-wave (CW) mode and pulse mode, the maximum output powers of 1.37 and 1.20 W are achieved, corresponding to slope efficiencies of 23.62% and 22.91%, respectively. To the best of our knowledge, compared with other Er 3+ -doped garnet laser crystals, we obtained a larger power and higher efficiency CW laser simultaneously for LD end-pumped Er:YSGG crystal. The beam quality factor M2 in x and y directions are determined to be 1.64/1.65, suggesting the Er:YSGG laser possesses a higher beam quality. All these results indicate that Er:YSGG is a promising mid-infrared gain medium for high efficiency and high power laser operation.

中文翻译：

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二极管端面泵浦 1.37 W Er:YSGG 连续波激光器 2.8μm 左右


我们对比展示了不同掺杂浓度的 LD 端泵浦 Er:YSGG 晶体的激光性能。实验结果表明，30at. ％Er：尺寸为2 mm×2 mm×8 mm的YSGG晶体具有最好的激光输出。在连续波 (CW) 模式和脉冲模式下，可实现 1.37 和 1.20 W 的最大输出功率，对应的斜率效率分别为 23.62% 和 22.91%。据我们所知，与其他Er 3+ 掺杂石榴石激光晶体相比，我们的LD端泵浦Er:YSGG晶体同时获得了更大功率和更高效率的连续激光。 x和y方向的光束质量因子M2确定为1.64/1.65，表明Er:YSGG激光器具有更高的光束质量。所有这些结果表明，Er:YSGG 是一种有前途的中红外增益介质，适用于高效率和高功率激光操作。