We obtained 51 W of UV laser light at 343nm for 8 ns temporally square-shape pulse at 400 kHz repetition rate which corresponds to a peak power of 42.5kW and a conversion rate of 38% from a 133W linearly polarized signal at 1030nm. This high UV power is achieved by third harmonic generation of infrared beam which is generated thanks to a newly developed Ytterbium-doped rod-type high-power amplifier effectively singlemode fiber with a hybrid hexagonal and aperiodic cladding design. Two fibers with MFD at 47µm and 67µm were tested. The 47µm MFD fiber allow to reach up to 200W of singlemode signal before the TMI appearance. This fiber can deliver 150 W of 1030 nm signal with a 250 W pump light, for different nanosecond pulse durations and repetition rates with excellent beam quality (M²<1.1).
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Chervet et al. (2024) studied this question.
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