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We demonstrate a high-power high-beam-quality ultraviolet (UV) laser at 330 nm based on fourth-harmonic generation (FHG) of a diode-side-pumped 1319-nm Nd:YAG laser. A 23.2-W Q-switched Nd:YAG laser at 1319 nm with beam quality factor $M^{2}=1.15$ and optical to optical conversion efficiency of 6.5% was employed as the fundamental wave source. First, the output at 1319 nm was frequency doubled to...
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