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Ionization of noble gases with pulses directly from a laser oscillator

S. Dewald, T. Lang, C. D. Schröter, R. Moshammer, J. Ullrich, M. Siegel, and U. Morgner

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Abstract

A Ti:sapphire oscillator with an extended cavity generates pulses with 0.5μJ energy at a repetition rate of 6MHz and pulse durations of 50fs. Tight focusing creates peak intensities exceeding 1014W∕cm2, which is sufficient for ionizing helium, a nonlinear process where at least 17 photons are absorbed simultaneously.

© 2006 Optical Society of America

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