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We describe an external resonant ring that contains two nonlinear crystals. The crystals double and then quadruple the frequency of the input radiation. The ring is driven by a commercial 15 W cw mode-locked 1.053 pm Nd:YLF laser. We generated UV output powers of 6.7 W and 2.9 W in low-duty-cycle and continuously phase-locked operation, respectively.
© 1993 Optical Society of America
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