Chinese Journal of Quantum Electronics, Volume. 40, Issue 3, 392(2023)

All-solid-state watt-level 388 nm continuous-wave ultraviolet laser

QIAN Longlong, SHEN Yong, LIU Qu, and ZOU Hongxin*
Author Affiliations
  • College of Science, National University of Defense Technology, Changsha 410073, China
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    Using a homemade 776.9 nm semiconductor laser as seeder, a 2.3 W fundamental frequency output is obtained through amplification of a tapered amplifier (TA) and shaping. Then, a 388.4 nm continuous-wave laser is generated by the second harmonic generation (SHG) of a Class I phase matched lithium borate (LBO) crystal with an external bow-tie cavity. It is shown that the severely thermal effect of TA can change the waist position of the generated laser beam and limit the conversion efficiency of the second harmonic generator. Therefore, the thermal effect of TA is analyzed, and a laser beam shaping scheme consisted of cylindrical lens, prism pair and lens is proposed to compensate for the thermal effect. Furthermore, by optimizing the beam waist size and cavity parameters of the cavity, the conversion efficiency of the second harmonic is improved. Finally, the basic frequency input of 2.3 W can generate a ultraviolet laser output of 940 mW, with SHG efficiency of 41%.

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    Longlong QIAN, Yong SHEN, Qu LIU, Hongxin ZOU. All-solid-state watt-level 388 nm continuous-wave ultraviolet laser[J]. Chinese Journal of Quantum Electronics, 2023, 40(3): 392

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    Paper Information

    Category:

    Received: Oct. 6, 2021

    Accepted: --

    Published Online: Jun. 30, 2023

    The Author Email: ZOU Hongxin (hxzou@nudt.edu.cn)

    DOI:10.3969/j.issn.1007-5461.2023.03.011

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