Phase Measurement of Resonant Two-Photon Ionization in Helium

Abstract

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.

arXiv comment4 pages, 5 figures, under consideration

References in corpus (3)

• Phase-resolved attosecond near-threshold photoionization of molecular nitrogen
• Intensity Dependence of Laser-Assisted Attosecond Photoionization Spectra
• Spatial separation of large dynamical blue shift and harmonic generation

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