Journal
OPTICS LETTERS
Volume 28, Issue 6, Pages 480-482Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.28.000480
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We report the wave-front phase measurement of high-order harmonics employing point-diffraction interferometry. The high-order harmonics generated in a gas-filled hollow tube showed excellent spatial coherence over nearly the whole cross section of the harmonic beams. Using this coherent harmonic source in the extreme-ultraviolet-soft-x-ray region, we have demonstrated the operation of a point-diffraction interferometer and measured the wave-front phase of high-order harmonics. (C) 2003 Optical Society of America.
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