Zhu, P.P.ZhuLi, D.D.LiLiu, Q.Q.LiuChen, J.J.ChenFu, S.S.FuShi, P.P.ShiDu, K.K.DuLoosen, P.P.Loosen2022-03-042022-03-042013https://publica.fraunhofer.de/handle/publica/23370510.1364/OL.38.004716Based on our reliable high-power picosecond laser source with high beam qualities, we designed a compact and efficient third harmonic generation scheme by cascading a frequency doubling and a sum frequency generation using LBO as the nonlinear material. A maximum output of 39.1 W with a repeat rate of 1 MHz at 355 nm was obtained, which implied a pulse energy of 39.1 mJ, which was the highest picosecond UV pulse energy with an all-solid-state setup so far. The total conversion efficiency from infrared to UV was up to 46%. And the output UV has excellent beam qualities with an M-square factor less than 1.1.en621journal article