A new crystalline medium for 1.5 ?m Yb-Er lasers is proposed: GdCa<sub>4</sub>O(BO<sub>3</sub>)<sub>3</sub> (GdCOB). Its melting point allows crystal growth using platinum instead of iridium crucibles. Spectroscopic and laser tests of the new material are described. A maximum CW output power of 80 mW was achieved in a monolithic microchip cavity under laser diode pumping.

© 2004 Optical Society of America

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