Phase- and intensity-resolved measurements of above threshold ionization by few-cycle pulses

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Date
2018-06-11
Volume
51
Issue
13
Journal
Journal of physics : B, Atomic, Molecular and Optical Physics
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Publisher
Bristol : IOP Publ.
Abstract

We investigate the carrier-envelope phase (CEP) and intensity dependence of the longitudinal momentum distribution of photoelectrons resulting from above threshold ionization of argon by few-cycle laser pulses. The intensity of the pulses with a center wavelength of 750 nm is varied in a range between 0.7 × 1014 and . Our measurements reveal a prominent maximum in the CEP-dependent asymmetry at photoelectron energies of 2 U P (U P being the ponderomotive potential), that is persistent over the entire intensity range. Further local maxima are observed around 0.3 and 0.8 U P. The experimental results are in good agreement with theoretical results obtained by solving the three-dimensional time-dependent Schrödinger equation. We show that for few-cycle pulses, the amplitude of the CEP-dependent asymmetry provides a reliable measure for the peak intensity on target. Moreover, the measured asymmetry amplitude exhibits an intensity-dependent interference structure at low photoelectron energy, which could be used to benchmark model potentials for complex atoms.

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Citation
Kübel, M., Arbeiter, M., Burger, C., Kling, N. G., Pischke, T., Moshammer, R., et al. (2018, June). Phase- and intensity-resolved measurements of above threshold ionization by few-cycle pulses (Bristol : IOP Publ.). Bristol : IOP Publ. https://doi.org//10.1088/1361-6455/aac584
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CC BY 3.0 Unported