Journal
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
Volume 51, Issue 13, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6455/aac584
Keywords
strong-field physics; above threshold ionization; few-cycle pulses; carrier-envelope phase; laser intensity
Categories
Funding
- Max Planck Society
- DFG [SPP1840, SFB652]
- LMUexcellent
- cluster of excellence 'Munich Centre for Advanced Photonics' (MAP)
- European Union [307203]
- H2020 project ATTOCHEM [657544]
- Heisenberg fellowship
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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. x 10(14) and 5.5 10(14) W cm(-2). 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 Schrodinger 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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