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Phase Measurement of Resonant Two-Photon Ionization in Helium

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.

preprint2010arXivOpen access
M. SwobodaT. FordellK. KlünderJ. M. DahlströmM. MirandaC. ButhK. J. SchaferJ. MauritssonA. L'HuillierM. Gisselbrecht
physics.atom-phphysics.optics
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Open access10 authors2 topics
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M. SwobodaT. FordellK. KlünderJ. M. DahlströmM. MirandaC. ButhK. J. SchaferJ. MauritssonA. L'HuillierM. Gisselbrecht

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