Journal
PHYSICAL REVIEW LETTERS
Volume 104, Issue 10, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.104.103003
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Funding
- Marie Curie Intra-European Fellowship ATTOCO
- Marie Curie Early Stage Training Site (MAXLAS)
- European Research Council (ALMA)
- Knut and Alice Wallenberg Foundation
- Swedish Research Council
- National Science Foundation [PHY-0449235, PHY-0701372]
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We study resonant two-color two-photon ionization of helium via the 1s3p (1)P(1) state. The first color is the 15th harmonic of a tunable Ti:sapphire laser, while the second color is the fundamental laser radiation. Our method uses phase-locked high-order harmonics to determine the phase of the two-photon process by interferometry. The measurement of the two-photon ionization phase variation as a function of detuning from the resonance and intensity of the dressing field allows us to determine the intensity dependence of the transition energy.
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