Abstract
We present a novel interferometric setup operating in the XUV spectral range. The interferometer consists of a combination of a double pinhole (similar to Young’s double slit) and a transmission grating. In the case of a light source consisting of discrete spectral lines, it allows recording interferograms for multi-colors simultaneously. We present two experiments in which high-order harmonics generated by a titanium sapphire laser were used as the light source for the interferometer. First, the temporal coherence lengths of the single harmonics were determined, and second, the index of refraction and the absorption of a thin beryllium foil were measured simultaneously in the range of 17–25 nm.
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Hemmers, D., Pretzler, G. Multi-color XUV interferometry using high-order harmonics. Appl. Phys. B 95, 667–674 (2009). https://doi.org/10.1007/s00340-009-3510-3
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DOI: https://doi.org/10.1007/s00340-009-3510-3