Fluorescence quantum efficiency measurements in the presence of Auger upconversion by the thermal lens method
Abbreviated Journal Title
LASER CRYSTALS; UP-CONVERSION; CRLISRALF6; OPERATION; Optics
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, W-up = gammaN(e), the theoretical model developed fits the experimental data well. The ETU parameters (gamma) were determined with unprecedented accuracy for low Cr concentrations. Thermo-optical parameters (K, ds/dT) were also obtained. (C) 2003 Optical Society of America.
"Fluorescence quantum efficiency measurements in the presence of Auger upconversion by the thermal lens method" (2003). Faculty Bibliography 2000s. 3964.