Measured (left) and calculated (right) double-slit interference pattern of soft x-ray harmonics from Ne at 330 eV.

From the article:

Bright, Coherent, Ultrafast Soft X-Ray Harmonics Spanning the Water Window from a Tabletop Light Source
M.-C. Chen, P. Arpin, T. Popmintchev, M. Gerrity, B. Zhang, M. Seaberg, D. Popmintchev, M. M. Murnane, and H. C. Kapteyn
Phys. Rev. Lett. 105, 173901 (2010)

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