Abstract

Energy-transfer processes (including upconversion) are quantitatively studied in a Tm:Yb:BaY2F8 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  3F4,  3H4,  3F3,2,  1G4, and  3P0 are populated via Yb–Tm interaction, and the level  1D2 is likely populated owing to  3F3 Tm3F3 Tm upconversion. The possibility of resonant excited-state absorption at 706 nm and resonant energy-transfer upconversion populating the level  1D2 are discussed. The possibility of avalanche pumping of Tm:Yb:BaY2F8 at 706 nm is shown.

© 1997 Optical Society of America

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