Abstract

We report the experimental measurement of Ramsey interference fringes in the single-photon excitation to a high-lying bound state of atomic argon by pairs of phase-locked, time-delayed, extreme UV high-order-harmonic pulses at $87\mathrm{nm}$. High-visibility Ramsey fringes are observed for delays larger than $100\mathrm{ps}$, thus demonstrating a potential resolving power $>{10}^5$ at this wavelength.

© 2010 Optical Society of America

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