14 February 2008 Power scaling and optimum crystal orientation in continuous-wave diode-pumped Yb:KLu(WO4)2 lasers
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Abstract
Monoclinic potassium double tungstates are biaxial laser materials characterized by strong anisotropy of the spectroscopic properties. KLu(WO4)2 is the most attractive of them in the case of Yb-doping because of the close ionic radii of Yb and Lu. In this work we compare crystals of equal dimensions and doping level but different cuts, under the same pumping conditions. Special emphasis is placed on the polarization behavior. We present substantial power scaling with KLu(WO4)2 in the continuous-wave regime by longitudinal fiber-coupled diode laser pumping. Slope efficiency of roughly 80% is achieved while the naturally selected laser polarization is parallel either to the Np or Nm principal optical axes. A maximum output power of 11.0 W was produced from a 2 mm thick uncoated crystal with Ng-cut, the corresponding optical-to-optical efficiency was 68%.
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Junhai Liu, Valentin Petrov, Xavier Mateos, Huaijin Zhang, and Jiyang Wang "Power scaling and optimum crystal orientation in continuous-wave diode-pumped Yb:KLu(WO4)2 lasers", Proc. SPIE 6871, Solid State Lasers XVII: Technology and Devices, 68712F (14 February 2008); doi: 10.1117/12.761014; https://doi.org/10.1117/12.761014
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