T. Kasamatsu et al., Temperature dependence and optimization of 970-nm diode-pumped Yb : YAG and Yb : LuAG lasers, APPL OPTICS, 38(24), 1999, pp. 5149-5153
We have investigated the temperature dependence of output performances for
970-nm diode-pumped Yb:YAG (Yb3+:Y3Al5O12) and Yb:LuAG(Yb3+:Lu3Al5O12) lase
rs over the wide temperature range from 80 to 310 K. Temperature-optimized
operation was experimentally demonstrated at around 160 K and was theoretic
ally confirmed by taking into account the absorption spectra change of Yb c
rystals at low temperatures. Cooling the crystal to below 160 K caused a na
rrowing of the absorption bandwidth and led to a decrease in output power a
nd efficiency. (C) 1999 Optical Society of America. OCIS codes: 140.3070, 1
40.5680, 300.1030.