Relations among absorption of pump beam, quantum defect and thermal load were investigated for pump wavelengths of
968 nm and near 940 nm in two independent, real-time measurement experiments complemented with thermal
distribution simulation. Saturation of absorption at 969 nm pumping for non-lasing operational regime, which affects
temperature rise and exists independently of the thin disk type, disk head construction, pump power and pump beam
diameter is reported. Disk temperature dependence of absorption, quantum defect and disk geometry and large difference
between absorption, disk temperature and o-o efficiency at both pump wavelengths are discussed.
P. Severová, M. Chyla, J. Mužík, M. Smrž, T. Miura, M. Kawasaki, T. Higashiguchi, A. Endo, and T. Mocek, "Investigation and modelling of pump saturation effect on thermal load of Yb:YAG thin disk pumped at various wavelengths," Proc. SPIE 10238, High-Power, High-Energy, and High-Intensity Laser Technology III, 102380P (Presented at SPIE Optics + Optoelectronics: April 27, 2017; Published: 11 May 2017); https://doi.org/10.1117/12.2265822.
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