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The interference pattern produced by a single 13 nm high-order harmonic pulse is captured by an extreme-ultraviolet CCD camera. A beam divergence of 0.35 mrad and a high fringe visibility of 0.96 are obtained with an optimal phase-matching condition for the 13 nm harmonics. The spatial coherence length of the 13 nm harmonics selected by Mo/Si multilayer mirrors is larger than the beam diameter. This result shows that the 13 nm harmonic beam is useful for applications in interferometry, time-resolved studies of ultrafast dynamics.
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Nagata et al. (2007) studied this question.
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