Abstract
We characterize the phase shift induced by reflection on a multilayer mirror in the extreme UV range (80–) using two techniques: one based on high order harmonic generation and attosecond metrology (reconstruction of attosecond beating by interference of two-photon transitions), and a second based on synchrotron radiation and measurements of standing waves (total electron yield). We find an excellent agreement between the results from the two measurements and a flat group delay shift () over the main reflectivity peak of the mirror.
© 2011 Optical Society of America
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