Abstract

Mode-mismatched thermal lens (TL) measurements in Cr3+-doped fluoride crystals (LiSrAlF6 and LiSrGaF6) are reported. A nonlinear increase of the TL signal, and decrease of quantum efficiency, with increasing excitation power was observed and attributed to energy-transfer upconversion (ETU). Assuming an upconversion rate that is proportional to the excited-state population, Wup=γNe, the theoretical model developed fits the experimental data well. The ETU parameters γ were determined with unprecedented accuracy for low Cr concentrations. Thermo-optical parameters K,ds/dT were also obtained.

© 2003 Optical Society of America

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