Abstract

We discuss some physical effects that take place in multifrequency light fields with a nonzero average cube of the electric field, 〈E3〉 ≠ 0. We calculated the polar asymmetry in electron emission that is due to interference between two-photon ionization by the fundamental radiation (ω) and one-photon ionization by the second-harmonic (2ω) wave. The expression for the quasi-static force, which acts on electrons and is proportional to the average cube of the light field, is derived.

© 1991 Optical Society of America

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