| Citation: | ZHENG Quan, XIAO Hui-dong, CHEN Xi, WANG Yan, WANG Yu-ning, LIU Hui-zhen, TIAN Dong-he, WANG Jin-yan, YAO Yi. 275 nm ultraviolet laser with 351 mW continuous-wave output in a Pr:YLF laser pumped by a blue laser diode at 444.2 nm[J]. Chinese Optics, 2025, 18(2): 376-381. doi: 10.37188/CO.EN-2024-0024
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This paper describes what is thought to be the first generation of a continuous wave deep ultraviolet laser at 275 nm by efficient frequency doubling of a blue-diode-pumped Pr:YLF laser at 550 nm. By employing a novel fast-axis collimated blue semiconductor laser as the pump source, combined with a folded cavity and innovation coating technology, and utilizing a Brewster-cut BBO crystal for intracavity frequency doubling, TEM00 mode deep UV laser radiation at 275 nm with an output power of 351 mW is obtained. This marks the first report of achieving 275 nm laser generation based on Pr:LiYF4 to date.
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