Sum-frequency generation of 133 mJ, 270 ps laser pulses at 266 nm in LBO crystals
Nan Wang, Jingyuan Zhang, Haijuan Yu, Xuechun Lin, Guowen Yang
Abstract
We demonstrate the generation of high-energy (133 mJ) and sub-nanosecond (∼270 ps) deep ultraviolet (DUV) pulses at 266 nm by sum-frequency mixing in LiB 3 O 5 (LBO) crystals. The highest 133 mJ pulse energy ever reported corresponds to a peak power of 0.49 GW and an energy conversion efficiency of 13.3% from the infrared at 1064 nm to DUV at 266 nm. This is the highest output energy ever reported for the DUV sub-nanosecond pulses to the best of our knowledge. Higher energy efficiency of 25.7% can be achieved from 1064 nm to 266 nm when the fundamental energy was reduced to 346 mJ. Furthermore, the DUV generations using LBO and typical β-BaB 2 O 4 (BBO) crystals were compared regarding the energy efficiency, and the effects of the nonlinear absorption are discussed.