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