Fourth-harmonic-generation of 266-nm ultraviolet nanosecond laser with NaSr3Be3B3O9F4 crystal
Author(s): Chen, XD (Chen, Xudong); Liu, LJ (Liu, Lijuan); Wang, LR (Wang, Lirong); Zhang, L (Zhang, Ling); Wang, XY (Wang, Xiaoyang); Chen, ZY (Chen, Zhaoyang); Zhang, XW (Zhang, Xingwang)
Source: OPTICAL ENGINEERING Volume: 59 Issue: 11 Article Number: 116110 DOI: 10.1117/1.OE.59.11.116110 Published: NOV 2020
Abstract: Ultraviolet (UV) 266-nm nanosecond (ns) laser was obtained through fourthharmonic-generation by using new nonlinear optical crystals of NaSr3Be3B3O9F4 (NSBBF) with different lengths. Since NSBBF crystals are prone to crack during laser experiments, we added a water-cooling device under NSBBF crystal in the experiment, and compared the experimental results under conditions of water cooling and no water cooling. Moreover, different laser focusing effects were explored to optimize the experimental conditions. The maximum optical conversion efficiency from 532 to 266 nm was 4.8% with the pump power of 2.8 W. The maximum average output power of the 266-nm UV laser was 420 mW when the 532-nm pump power was 23.82 W. The study provides research ideas and experimental basis for NSBBF crystal to realize higher-power 266-nm ns laser output. (C) 2020 Society of Photo Optical Instrumentation Engineers (SPIE)
Accession Number: WOS:000597284800029
ISSN: 0091-3286
eISSN: 1560-2303
