Abstract

We present a quasi-cw laser in a vacuum ultraviolet region at megahertz repetition rate. The narrowband pulses generated from an ytterbium-fiber laser system at 33MHz repetition rate at the central wavelength of 1074nm are frequency-converted by successive stages of LiB3O5 crystals and KBe2BO3F2 crystals. The generated radiation at 153nm has the shortest wavelength achieved through phase-matched frequency conversion processes in nonlinear optical crystals to our knowledge.

© 2011 Optical Society of America

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