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We demonstrate a continuous-wave ytterbium-doped fiber amplifier whichproduces 6.3 W at a wavelength of 972.5 nm. We frequency quadruple this sourcein two resonant doubling stages to produce 530 mW at 243.1 nm. Radiation atthis wavelength is required to excite the 1S-2S transition in atomic hydrogenand could therefore find application in experimental studies of hydrogen andanti-hydrogen.

Yb fiber amplifier at 972.5 nm with frequency quadrupling to 243.1 nm