Phase-dependent asymmetries in strong-field photoionization by few-cycle laser pulses
Journal Article
·
· Physical Review. A
- Laboratoire de Chimie Theorique, Faculte des Sciences, Universite de Sherbrooke, Quebec, J1K 2R1 (Canada)
Using numerical solutions of the time-dependent Schroedinger equation for a hydrogen and a helium atom in a linearly polarized laser field, we calculate the photoelectron signal P{sub +}, P{sub -} measured by two opposing detectors placed along the laser polarization vector, with laser focus in the center. Our calculations show a significant sensitivity of the normalized asymmetry coefficient a=(P{sub +}-P{sub -})/(P{sub +}+P{sub -}) to the carrier-envelope (CE) phase for few-cycle laser pulses. We find a very simple dependence of this coefficient on the CE phase {phi} and on pulse duration for laser intensities slightly below the tunneling regime, i.e., for the intensities range between the perturbative-multiphoton and tunneling regime, for laser pulses shorter than two laser cycles. In particular, we find that in this intensity regime, the asymmetry is zero for a fixed, particular value of {phi}={phi}{sub 0}{approx_equal}-0.3{pi} and is maximum for {phi}={phi}{sub M}={phi}{sub 0}+{pi}/2. These regularities would allow one to measure the CE phase. In particular, the condition of zero asymmetry for few-cycle pulses can be useful for stabilizing the CE phase.
- OSTI ID:
- 20645811
- Journal Information:
- Physical Review. A, Journal Name: Physical Review. A Journal Issue: 1 Vol. 70; ISSN 1050-2947; ISSN PLRAAN
- Country of Publication:
- United States
- Language:
- English
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