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 1014Wcm2, 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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