Quasi-three-level laser pumped Yb:GdCOB tunable laser from 1030 to 1036 nm

We report a quasi-three-level laser pumped Ca 4 GdO(BO 3 ) 3 (Yb:GdCOB) tunable laser based on the transition from the 2 F 5/2 level to the 2 F 7/2 level. By adjusting the 902 nm pump power, a continuous waves Yb:GdCOB laser was obtained with the near-infrared wavelengths shifting from 1030 nm to 1036 nm. The highest tuning power of 2.5 W was achieved with a slope efficiency of 19.9%. To our knowledge, it is the first tunable Yb:GdCOB laser to be realized by adjusting the pump power. This work provides a novel method to generate tunable solid-state lasers with a compact and simple structure.