Nakao Hiroaki, Shirakawa Akira, Ueda Ken-ichi, Yagi Hideki, Yanagitani Takagimi, Weichelt Birgit, Wentsch Katrin, Ahmed Marwan Abdou, Graf Thomas
Opt Lett. 2014 May 15;39(10):2884-7. doi: 10.1364/OL.39.002884.
Yb:LuAG ceramic is very promising for thin-disk laser and amplifier architectures since it exhibits a higher thermal conductivity at high doping concentrations and a larger emission cross section than Yb:YAG. In this Letter, we present what we believe to be the first demonstration of a thin-disk laser based on Yb:LuAG ceramic. A maximum output power of 101 W with an optical efficiency of 56% and a slope efficiency of 64% was obtained with a multimode laser resonator. Fundamental-mode laser operation with near diffraction limited beam quality (M2≈1.22) was also achieved. The fundamental-mode laser resonator showed the output power of 49 W, an optical efficiency of 31%, and a slope efficiency of 44%. A linearly polarized output beam was demonstrated in multimode operation using an intracavity Brewster window. The depolarization loss was measured to be as low as 0.15% per round trip.
镱掺杂的镥铝石榴石（Yb:LuAG）陶瓷对于薄盘激光器和放大器结构而言非常有前景，因为在高掺杂浓度下它展现出比镱掺杂的钇铝石榴石（Yb:YAG）更高的热导率和更大的发射截面。在本信函中，我们展示了我们认为的基于Yb:LuAG陶瓷的薄盘激光器的首次演示。使用多模激光谐振腔获得了101瓦的最大输出功率，光学效率为56%，斜率效率为64%。还实现了具有近衍射极限光束质量（M²≈1.22）的基模激光运转。基模激光谐振腔展现出49瓦的输出功率、31%的光学效率和44%的斜率效率。在多模运转中使用腔内布儒斯特窗展示了线偏振输出光束。测得每往返一周的退偏损耗低至0.15%。
