Based 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 μJ, 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.
© 2013 Optical Society of America
Lasers and Laser Optics
Original Manuscript: July 29, 2013
Revised Manuscript: September 24, 2013
Manuscript Accepted: September 25, 2013
Published: November 12, 2013
Peng Zhu, Daijun Li, Qingyong Liu, Jun Chen, Shaojun Fu, Peng Shi, Keming Du, and Peter Loosen, "39.1 μJ picosecond ultraviolet pulses at 355 nm with 1 MHz repeat rate," Opt. Lett. 38, 4716-4718 (2013)