Phase Measurement of Resonant Two-Photon Ionization in Helium

Details Phase Measurement of Resonant Two-Photon Ionization in Helium Phase Measurement of Resonant Two-Photon Ionization in Helium

2010-02-12

arxiv.org/abs/1002.2550v1

Physical Review Letters 2010

Physics

Atomic Physics

4 pages, 5 figures, under consideration

Scientific paper

10.1103/PhysRevLett.104.103003

We study resonant two-color two-photon ionization of Helium via the 1s3p 1P1 state. The first color is the 15th harmonic of a tunable titanium sapphire laser, while the second color is the fundamental laser radiation. Our method uses phase-locked high-order harmonics to determine the {\it 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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