Article

Spectroscopic and lasing studies of Ce3+:Er3+:Yb3+:YVO4 crystals

Laser Physics Letters (Impact Factor: 7.71). 07/2011; 8(10):729 - 735. DOI: 10.1002/lapl.201110056

ABSTRACT Absorption and fluorescence spectra and fluorescence lifetime measurements are presented for Ce3+:Er3+:Yb3+:YVO4 crystals and compared to the corresponding data for Er3+:Yb3+:YVO4 crystals. These results show that doping with Ce3+ ions reduces the lifetime of the 4I11/2 state of Er3+ and thereby both suppresses upconversion from this state and improves the energy transfer efficiency from Yb3+ to Er3+. Lasing from this material is also demonstrated for this first time, both in quasi-continuous wave (QCW) and Q-switched modes. To obtain laser action at ∼1.5 µm, the Ce3+:Er3+:Yb3+:YVO4 crystals were pumped by laser diodes operating at ∼0.98 µm. For QCW operation, a slope efficiency of 2.6% and a threshold of 12 W were obtained. Q-switched pulses of 27 µJ energy and 52 µs pulse to pulse duration were also measured. (© 2011 by Astro Ltd., Published exclusively by WILEY-VCH Verlag GmbH & Co. KGaA) (© 2011 by Astro Ltd., Published exclusively by WILEY-VCH Verlag GmbH & Co. KGaA)

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