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 repetition rate at the central wavelength of are frequency-converted by successive stages of crystals and crystals. The generated radiation at 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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