Attosecond pulse shaping around a Cooper minimum.
High harmonic generation (HHG) is used to measure the spectral phase of the recombination dipole matrix element (RDM) in argon over a broad frequency range that includes the 3p Cooper minimum (CM). The measured RDM phase agrees well with predictions based on the scattering phases and amplitudes of the interfering s- and d-channel contributions to the complementary photoionization process. The reconstructed attosecond bursts that underlie the HHG process show that the derivative of the RDM spectral phase, the group delay, does not have a straightforward interpretation as an emission time, in contrast to the usual attochirp group delay. Instead, the rapid RDM phase variation caused by the CM reshapes the attosecond bursts.
Department of Physics, The Ohio State University, Columbus, Ohio 43210, USA.
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Schoun
Department of Physics, The Ohio State University, Columbus, Ohio 43210, USA.
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Chirla
Department of Physics, The Ohio State University, Columbus, Ohio 43210, USA.
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Wheeler
Department of Physics, The Ohio State University, Columbus, Ohio 43210, USA.
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Roedig
Department of Physics, The Ohio State University, Columbus, Ohio 43210, USA.
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Agostini
Department of Physics, The Ohio State University, Columbus, Ohio 43210, USA.
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DiMauro
Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA.
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Schafer
Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA.
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Gaarde