Attosecond Pulse Trains Generated Using Two Color Laser Fields
J. MauritssonDepartment of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803-4001, USAP. JohnssonDepartment of Physics, Lund Institute of Technology, P.O. Box 118, SE-221 00 Lund, SwedenE. GustafssonDepartment of Physics, Lund Institute of Technology, P.O. Box 118, SE-221 00 Lund, SwedenA. L’HuillierDepartment of Physics, Lund Institute of Technology, P.O. Box 118, SE-221 00 Lund, SwedenKenneth J. SchäferDepartment of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803-4001, USAMette B. GaardeDepartment of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803-4001, USA
2006en
ABI
Abstract
We investigate the spectral and temporal structure of high harmonic emission from argon exposed to an infrared laser field and its second harmonic. For a wide range of generating conditions, trains of attosecond pulses with only one pulse per infrared cycle are generated. The synchronization necessary for producing such trains ensures that they have a stable pulse-to-pulse carrier envelope phase, unlike trains generated from one color fields, which have two pulses per cycle and a pi phase shift between consecutive pulses. Our experiment extends the generation of phase stabilized few cycle pulses to the extreme ultraviolet regime.
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