Abstract

We have investigated the temperature dependence of output performances for 970-nm diode-pumped Yb:YAG (Yb³⁺:Y₃Al₅O₁₂) and Yb:LuAG (Yb³⁺:Lu₃Al₅O₁₂) lasers over the wide temperature range from 80 to 310 K. Temperature-optimized operation was experimentally demonstrated at around 160 K and was theoretically confirmed by taking into account the absorption spectra change of Yb crystals at low temperatures. Cooling the crystal to below 160 K caused a narrowing of the absorption bandwidth and led to a decrease in output power and efficiency.

© 1999 Optical Society of America

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