Abstract
Energy-transfer processes (including upconversion) are quantitatively studied in a laser crystal. Several energy-transfer, cross-relaxation, and upconversion parameters are determined. We prove that at excitation of the crystal via Yb ions, the Tm levels
and are populated via Yb–Tm interaction, and the level is likely populated owing to upconversion. The possibility of resonant excited-state absorption at 706 nm and resonant energy-transfer upconversion populating the level are discussed. The possibility of avalanche pumping of at 706 nm is shown.
© 1997 Optical Society of America
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