Abstract
Mode-mismatched thermal lens (TL) measurements in -doped fluoride crystals ( and ) 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, , the theoretical model developed fits the experimental data well. The ETU parameters were determined with unprecedented accuracy for low Cr concentrations. Thermo-optical parameters were also obtained.
© 2003 Optical Society of America
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