Abstract

The interference pattern produced by a single $13\mathrm{nm}$ high-order harmonic pulse is captured by an extreme-ultraviolet CCD camera. A beam divergence of $0.35\mathrm{mrad}$ and a high fringe visibility of 0.96 are obtained with an optimal phase-matching condition for the $13\mathrm{nm}$ harmonics. The spatial coherence length of the $13\mathrm{nm}$ harmonics selected by $\mathrm{Mo}∕\mathrm{Si}$ multilayer mirrors is larger than the beam diameter. This result shows that the $13\mathrm{nm}$ harmonic beam is useful for applications in interferometry, time-resolved studies of ultrafast dynamics.

© 2007 Optical Society of America

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