{"title":"High beam quality continuous-wave 320 nm UV laser from a walk-off compensated intracavity frequency-doubled Pr:YLF laser.","authors":"Yue Zuo, Bo Wu, Yonghang Shen","doi":"10.1364/AO.522760","DOIUrl":null,"url":null,"abstract":"<p><p>We report a high beam quality continuous-wave (CW) 320 nm ultra-violet (UV) laser. An end-pumped praseodymium-doped yttrium lithium fluoride (Pr:YLF) laser is constructed in a typical V-shaped cavity structure, while the UV output is obtained through intracavity frequency doubling using <i>L</i> <i>i</i> <i>B</i> <sub>3</sub> <i>O</i> <sub>5</sub> (LBO). We investigate the dependence of the UV output power, as well as the spot profile on the LBO length, and find that the \"walk-off\" within LBO severely affects both the frequency-doubling efficiency and the beam quality of the UV output. Rotated twin LBO crystals are then applied to substitute for single long LBO crystal to compensate the walk-off effect, resulting in high-power 320 nm output up to 410 mW under the absorbed pump power of 4.0 W at 444 nm, with a high beam quality of <i>M</i> <i>x</i>2=1.02 and <i>M</i> <i>y</i>2=1.04.</p>","PeriodicalId":101299,"journal":{"name":"Applied optics","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Applied optics","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1364/AO.522760","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
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Abstract
We report a high beam quality continuous-wave (CW) 320 nm ultra-violet (UV) laser. An end-pumped praseodymium-doped yttrium lithium fluoride (Pr:YLF) laser is constructed in a typical V-shaped cavity structure, while the UV output is obtained through intracavity frequency doubling using LiB3O5 (LBO). We investigate the dependence of the UV output power, as well as the spot profile on the LBO length, and find that the "walk-off" within LBO severely affects both the frequency-doubling efficiency and the beam quality of the UV output. Rotated twin LBO crystals are then applied to substitute for single long LBO crystal to compensate the walk-off effect, resulting in high-power 320 nm output up to 410 mW under the absorbed pump power of 4.0 W at 444 nm, with a high beam quality of Mx2=1.02 and My2=1.04.
我们报告了一种高光束质量的连续波（CW）320 nm 紫外线（UV）激光器。我们在典型的 V 型腔结构中构建了一个端泵浦掺镨氟化钇锂（Pr:YLF）激光器，并通过使用 L i B 3 O 5（LBO）进行腔内倍频来获得紫外输出。我们研究了紫外输出功率和光斑轮廓与 LBO 长度的关系，发现 LBO 内的 "走散 "现象严重影响了倍频效率和紫外输出的光束质量。因此，在 444 nm 波长吸收泵浦功率为 4.0 W 的情况下，320 nm 波长输出功率可达 410 mW，光束质量高达 M x2=1.02 和 M y2=1.04。
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