Abstract
The interference pattern produced by a single high-order harmonic pulse is captured by an extreme-ultraviolet CCD camera. A beam divergence of and a high fringe visibility of 0.96 are obtained with an optimal phase-matching condition for the harmonics. The spatial coherence length of the harmonics selected by multilayer mirrors is larger than the beam diameter. This result shows that the harmonic beam is useful for applications in interferometry, time-resolved studies of ultrafast dynamics.
© 2007 Optical Society of America
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