Dependence upon the molecular and atomic ground state of higher-order harmonic generation in the few-optical-cycle regime
- Coherentia-INFM and Dipartimento di Scienze Fisiche, Universita di Napoli 'Federico II', via Cintia, 26-80126 Naples (Italy)
- Blackett Laboratory, Imperial College of Science, Technology and Medicine, London SW7 2BW (United Kingdom)
- Laboratory for Ultraviolet and X-Ray Optical Research-INFM, DEI, Universita di Padova, Padova (Italy)
- INFM-Dipartimento di Fisica, Universita degli Studi, Milan (Italy)
- National Laboratory for Ultrafast and Ultraintense Optical Science-INFM, Dipartimento di Fisica, Politecnico, Milan (Italy)
High-order harmonic generation from molecules (O{sub 2}, N{sub 2}, H{sub 2}, and CO{sub 2}) and atoms (Xe, Ar, and Kr) has been studied in the few optical cycle domain. Two laser peak intensities; 2x10{sup 14} and 6x10{sup 14} W cm{sup -2}, were compared. At the lower intensity spectra were approximately the same for molecules and atoms with the same ionization potential, at higher laser intensity the cutoff of O{sub 2} and CO{sub 2} extends far beyond the cutoff of Xe and Kr, respectively, in contrast with N{sub 2} and H{sub 2} which exhibit cutoffs very close to that of Ar. This behavior is well explained by adopting an atomlike approximation for the molecule response in the high-field regime and employing the Lewenstein's model, properly modified in order to account for the nonlinear dipole moment of a randomly oriented molecule ensemble.
- OSTI ID:
- 20650262
- Journal Information:
- Physical Review. A, Vol. 71, Issue 1; Other Information: DOI: 10.1103/PhysRevA.71.013409; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
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