High-power, high-efficiency, all-fiberized-laser-pumped, 260-nm, deep-UV laser for bacterial deactivation
High-power, high-efficiency, all-fiberized-laser-pumped, 260-nm, deep-UV laser for bacterial deactivation
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DOI：
10.1364/oe.441248
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发表时间：
2021-12-20
期刊：
影响因子：
3.8
通讯作者：
Richardson, David J.
中科院分区：
文献类型：
--
作者：
Fu, Qiang;Hanrahan, Niall;Richardson, David J.
报道了一台全光纤掺YdF主振荡器功率放大器(MOPA)四倍频输出的5.8 W深紫外光(DUV)激光器。MOPA系统在1040 nm处输出585 ps脉冲，最大可用输出功率为23.5W，用于非线性频率转换。分别用三硼酸锂(LBO)晶体和贝塔硼酸钡(BBO)晶体进行二次和四次谐波(FHG)。在1.6 MHz的重复频率下，在260 nm处获得了5.8W的最大DUV输出功率，相应的脉冲能量为3.6µJ，最大峰值功率至少为6.9kW。在5.8W的DUV输出功率下，1微米到260 nm的转换效率达到26.4%。据我们所知，这些结果代表了最高的平均功率光纤激光泵浦的DUV激光器，以及迄今为止最有效的基于BBO晶体的DUV产生。我们进一步展示了脉冲紫外光激光在细菌消毒中的应用，在7MJ/cm(2)的紫外光照射下，对大肠杆菌的灭活率达到99.999%。由光学学会根据知识共享署名4.0许可证的条款出版。这部著作的进一步分发必须保持作者(S)的身份以及发表的文章的标题、期刊引文和DOI。
We report a 5.8-Wdeep-ultraviolet (DUV) laser obtained from frequency-quadrupling of an all-fiberized ytterbium-doped fiber (YDF) master oscillator power amplifier (MOPA). The MOPA system delivers 585 ps pulses at 1040 nm with a maximum available output power of 23.5 Wfor nonlinear frequency conversion. A lithium triborate (LBO) crystal and a beta barium borate (BBO) crystal are employed for second- and fourth-harmonic generation (FHG), respectively. At a repetition rate of 1.6 MHz, a maximum DUV output power of 5.8 W is obtained at 260 nm with a corresponding pulse energy of 3.6 mu J and maximum peak power of at least 6.9 kW. A 1 mu m-to-260nm conversion efficiency of 26.4% is achieved at a DUV output power of 5.8W. To the best of our knowledge these results represent the highest-average-power fiberized-laser-pumped DUV laser, as well as the most efficient DUV generation based on BBO crystals to date. We further demonstrate application of the pulsed DUV laser in bacterial disinfection achieving an inactivation efficiency of 99.999% for E-coli bacteria at a DUV exposure of 7 mJ/cm(2). Published by The Optical Society under the terms of the Creative Commons Attribution 4.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.