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Resumen: At the core of attosecond science lies the ability to generate laser pulses of subfemtosecond duration. In tabletop devices the process relies on high-harmonic generation, where a major challenge is to obtain high yields and high cutoff energies required for the generation of attosecond pulses. We develop a computational method that can simultaneously resolve these issues by optimizing the driving pulses using quantum optimal control theory. Our target functional, an integral over the harmonic yield over a desired energy range, leads to a remarkable cutoff extension and yield enhancement for a one-dimensional model H atom. The physical enhancement process is shown to be twofold: the cutoff extension is of classical origin, whereas the yield enhancement arises from increased tunneling probability. The scheme is directly applicable to more realistic models and, within straightforward refinements, also to experimental verification.
Idioma: Inglés
DOI: 10.1103/PhysRevA.90.053402
Año: 2014
Publicado en: Physical review. A, Atomic, molecular, and optical physics 90, 5 (2014), 053402 [5 pp]
ISSN: 1050-2947
Factor impacto JCR: 2.808 (2014)
Categ. JCR: OPTICS rank: 16 / 88 = 0.182 (2014) - Q1 - T1
Categ. JCR: PHYSICS, ATOMIC, MOLECULAR & CHEMICAL rank: 9 / 34 = 0.265 (2014) - Q2 - T1
Financiación: info:eu-repo/grantAgreement/EC/FP7/267374/EU/Dynamical processes in open quantum systems: pushing the frontiers of theoretical spectroscopy/DYNAMO
Financiación: info:eu-repo/grantAgreement/EC/FP7/280879/EU/Time dynamics and ContROl in naNOStructures for magnetic recording and energy applications/CRONOS
Financiación: info:eu-repo/grantAgreement/ES/MINECO/FIS2010-21282-C02-01
Financiación: info:eu-repo/grantAgreement/ES/UZ/UZ2012-CIE-06
Tipo y forma: Article (Published version)
Área (Departamento): Área Física Teórica (Dpto. Física Teórica)

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