Abstract
We study ionization of atoms in strong elliptically polarized laser fields numerically and analytically. We focus on the effects of laser ellipticity on the offset angle in the photoelectron momentum distribution. This angle is considered to encode the time information of tunneling ionization in attoclock experiments. The calculated offset angle increases with the decrease of ellipticity, but the momentum along the major axis of laser polarization related to this angle changes slowly, in agreement with experiments. With a Coulomb-included strong-field model, the scaling laws for the ellipticity dependence of this angle and relevant momentum components are obtained, and the ellipticity dependence of Coulomb-induced ionization time lag encoded in this angle is also addressed.
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