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Título
Schemes for generation of isolated attosecond pulses of pure circular polarization
Autor(es)
Materia
high-order harmonic generation
Ultrafast phenomena
X-ray beams & optics
Atomic gases
X-ray lasers
Atomic orbital
Bound states
Dipole approximation
Nonperturbative methods
Plane wave
Schroedinger equation
Strong-field approximation
Fecha de publicación
2016-04
Citación
Hernández-García, C., Durfee, C. G., Hickstein, D. D., Popmintchev, T., Meier, A., Murnane, M. M., Kapteyn, H. C., Sola, I. J., Jaron-Becker, A., & Becker, A. (2016). Schemes for generation of isolated attosecond pulses of pure circular polarization. Physical Review A, 93(4), 043855. https://doi.org/10.1103/PhysRevA.93.043855
Resumen
We propose and analyze two schemes capable of generating isolated attosecond pulses of pure circular polarization, based on results of numerical simulations. Both schemes utilize the generation of circularly polarized high-order-harmonics by crossing two circularly polarized counter-rotating pulses in a noncollinear geometry. Our results show that in this setup isolation of a single attosecond pulse can be achieved either by restricting the driver pulse duration to a few cycles or by temporally delaying the two crossed driver pulses. We further propose to compensate the temporal walk-off between the pulses across the focal spot and increasing the conversion efficiency by using angular spatial chirp to provide perfectly matched pulse fronts. The isolation of pure circularly polarized attosecond pulses, along with the opportunity to select their central energy and helicity in the noncollinear technique, opens new perspectives from which to study ultrafast dynamics in chiral systems and magnetic materials.
URI
ISSN
2469-9926
DOI
10.1103/PhysRevA.93.043855
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- ALF. Artículos [297]
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