Phase-Dependence of Resonant and Antiresonant Two-Photon Excitations
Lorenz Drescher,
Tobias Witting,
Oleg Kornilov
et al.
Abstract:Measurements of the phase of two-photon matrix elements are presented for near-resonant twocolor ionization of helium. A tunable, narrow-bandwidth, near-infrared (NIR) laser source is used for extreme ultra-violet (XUV) high-harmonic generation (HHG). The 15th harmonic of the laser is used within (1+1') XUV+NIR two-photon ionization, and tuned in and out of resonance with members of the 1snp 1 P1 (n = 3, 4, 5) Rydberg series. Rapid changes in the phase of the two-photon matrix elements around resonances and at… Show more
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