Tunable Yb:GdCOB self-frequency-doubling cyan laser

We report a solid-state laser-pumped Yb:GdO(BO3)3 (Yb:GdCOB) tunable self-frequency-doubling continuous wave (CW) cyan laser. By adjusting the pump power, a CW cyan laser emission was obtained with wavelengths shifting from 502 nm to 506 nm. The highest output power of 835 mW was achieved at an emission wavelength with an optical conversion efficiency of 5.8%. To the best of our knowledge, there have been no studies of the self-frequency-doubled Yb:GdCOB lasers at the cyan wavelength. This work provides a novel method to generate tunable solid-state lasers with a compact and simple structure.