Institut für Strahlwerkzeuge (IFSW), Universität Stuttgart, Stuttgart, Germany. birgit.weichelt@uni‐stuttgart.de
Opt Lett. 2012 Aug 1;37(15):3045-7. doi: 10.1364/OL.37.003045.
Pumping Yb:YAG or Yb:LuAG into the zero-phonon line at 969 nm instead of using the common pump wavelength of 940 nm reduces the heat generation by 32%. In addition to the 3% increase of the Stokes efficiency, this significantly reduces the diffraction losses caused by the thermally induced phase distortions leading to a remarkable increase of the overall efficiency especially of fundamental-mode thin-disk lasers. Using this pumping scheme in an Yb:LuAG thin-disk laser, we achieved 742 W of nearly diffraction limited (M2≈1.5) output power at an unprecedented high optical efficiency of 58.5%. For multimode operation (M2≈15) the maximum optical efficiency of an Yb:YAG thin-disk laser was increased to 72%.
将 Yb:YAG 或 Yb:LuAG 泵浦到 969nm 的零声子线，而不是使用常见的 940nm 泵浦波长，可将热生成减少 32%。除了斯托克斯效率提高 3%外，这还显著降低了热诱导相位失真引起的衍射损耗，从而导致整体效率的显著提高，特别是基模薄盘激光器的效率。在 Yb:LuAG 薄盘激光器中使用这种泵浦方案，我们实现了 742W 的近衍射极限（M2≈1.5）输出功率，前所未有的高光光效率为 58.5%。对于多模运行（M2≈15），Yb:YAG 薄盘激光器的最大光光效率提高到 72%。
