title: Single-shot spatial-coherence measurement of 13 nm high-order harmonic beam by a Young's double-slit measurement.
abstract: 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.
authors.affiliation: Midorikawa Laser Technology, RIKEN, Wako-shi, Saitama, Japan. ynagata@riken.jp
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Nagata
authors.forename: Kentaro
authors.initials: K
authors.lastname: Furusawa
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Nabekawa
authors.forename: Katsumi
authors.initials: K
authors.lastname: Midorikawa