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

doi:10.3969/j.issn.1007-5461.2023.03.011

Abstract

Abstract: 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%.

Key words: nonlinear optics, ultraviolet continuous-wave laser, second harmonic generation, thermal lens effect, LiB3O5 crystal

CLC Number:

O437.1

QIAN Longlong, SHEN Yong, LIU Qu, ZOU Hongxin. All-solid-state watt-level 388 nm continuous-wave ultraviolet laser[J]. Chinese Journal of Quantum Electronics, 2023, 40(3): 392-399.

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

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