A Yb<sup>3+</sup>:Ca<sub>4</sub>GdO(BO<sub>3</sub>)<sub>3</sub> (Yb:GdCOB) crystal has been diode pumped for the first time to our knowledge. We obtained 47.5% slope efficiency at 6 °C, producing 191 mW of power at 1050 nm, with a 2.4% output coupler. Temperature does not significantly affect the laser performance: At room temperature we still obtained 180 mW of power for the same cavity. We achieved tunability of the Yb:GdCOB laser from 1035 to 1088 nm with a 1.7% output coupler and 100-nm tunability with a low-transmission output coupling (<i>T</i> = 0.03%).
© 1999 Optical Society of America
Frederika Augé, François Balembois, Patrick Georges, Alain Brun, Frédéric Mougel, Gérard Aka, Andrée Kahn-Harari, and Daniel Vivien, "Efficient and Tunable Continuous-Wave Diode-Pumped Yb3+:Ca4GdO(BO3)3 Laser," Appl. Opt. 38, 976-979 (1999)