All-solid-state 360 nm ultraviolet laser generated by intracavity frequency-doubling of diode-pumped Pr3+:YLiF4 laser

We demonstrate an efficient and compact ultraviolet laser at 360 nm generated by intracavity frequency doubling of a continuous wave (CW) laser diode-pumped Pr3+:YLiF4 laser at 721 nm. A lithium triborate crystal, cut for critical type I phase matching at room temperature, is used for second-harmonic generation of the fundamental laser. By using an InGaN laser diode emitting at 444.3 nm with a maximum incident power of 5 W, as high as 460 mW of CW output power at 360 nm is achieved. The optical-to-optical conversion efficiency is as high as 9.2%, and the output power stability in 4 h is better than 3.86%. To the best of our knowledge, this is high efficient UV laser generated by frequency doubling of an InGaN diode-pumped Pr3+:YLiF4 laser.