Abstract

Erbium (Er)- and Ytterbium (Yb)-codoped monoclinic KLu(WO4)2 single crystals were grown by top seeded solution growth-slow cooling method for several different doping concentrations. Growth parameters have been optimized to obtain macrodefect-free single crystals. Er energy levels involved in the I413/2I415/2 were determined by 6  K polarized optical absorption. The maximum emission cross section for this electronic transition has been evaluated, being 2.85×1020cm2 for ENm at 1535  nm. Laser oscillation in the 1.5μm range was obtained by pumping the Yb ion at 980  nm and sensitizing Er. The maximum output power achieved was 152  mW, with 1.2% slope efficiency.

© 2008 Optical Society of America

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