Generation of Exceptionally Strong Harmonics from He in an Orthogonally Polarized Two-color Laser Field

Abstract

AbstractHighly efficient high-harmonic generation was achieved using a two-color laser field that consisted of the fundamental and its second harmonic. The harmonics generated in an orthogonally polarized two-color field were stronger than those obtained in the fundamental field by more than two orders of magnitude. Conversion efficiency as high as 5 × 10−5 was obtained for the 38th harmonic (21.6 nm) from helium driven by the two-color laser field with a proper relative phase. This enhancement is explained by analyzing the electron behavior in the two-color field. In addition, we confirmed the effects of mixed field by controlling the time delay between the two-color laser fields.KeywordsRelative PhaseHarmonic GenerationLaser FieldElectron Wave PacketFundamental FieldThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.