Intensity Dependence of Laser-Assisted Attosecond Photoionization Spectra

Details Intensity Dependence of Laser-Assisted Attosecond Photoionization Spectra Intensity Dependence of Laser-Assisted Attosecond Photoionization Spectra

2009-06-05

arxiv.org/abs/0906.1158v2

Laser Physics, published online 15 July 2009

Physics

Atomic Physics

preprint to article in Laser Physics Nikolai B. Delone memorial issue 11 pages, 9 figures, published online 15 July 2009

Scientific paper

10.1134/S1054660X09150390

We study experimentally the influence of the intensity of the infrared (IR) probe field on attosecond pulse train (APT) phase measurements performed with the RABITT method (Reconstruction of Attosecond Beating by Interference in Two-Photon Transitions). We find that if a strong IR field is applied, the attosecond pulses will appear to have lower-than-actual chirp rates. We also observe the onset of the streaking regime in the breakdown of the weak-field RABITT conditions. We perform a Fourier-analysis of harmonic and sideband continuum states and show that the mutual phase relation of the harmonics can be extracted from higher Fourier components.

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