The imaginary part of the high-harmonic cutoff
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Cita com:
hdl:2117/328219
Tipus de documentArticle
Data publicació2020-07-22
EditorIOP
Condicions d'accésAccés obert
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Reconeixement-NoComercial-SenseObraDerivada 3.0 Espanya
ProjecteAGR-INSTITUTO DE CIENCIAS FOTONICAS (MINECO-SEV-2015-0522)
NOQIA - NOvel Quantum simulators – connectIng Areas (EC-H2020-833801)
SIMULADOR CUANTICO DE ATOMO MAGNETICO (AEI-PCI2019-111828-2)
NOQIA - NOvel Quantum simulators – connectIng Areas (EC-H2020-833801)
SIMULADOR CUANTICO DE ATOMO MAGNETICO (AEI-PCI2019-111828-2)
Abstract
High-harmonic generation the emission of high-frequency radiation by the ionization and
subsequent recombination of an atomic electron driven by a strong laser eld is widely understood
using a quasiclassical trajectory formalism, derived from a saddle-point approximation, where
each saddle corresponds to a complex-valued trajectory whose recombination contributes to the
harmonic emission. However, the classi cation of these saddle points into individual quantum
orbits remains a high-friction part of the formalism. Here we present a scheme to classify these
trajectories, based on a natural identi cation of the (complex) time that corresponds to the
harmonic cuto . This identi cation also provides a natural complex value for the cuto energy,
whose imaginary part controls the strength of quantum-path interference between the quantum
orbits that meet at the cuto . Our construction gives an e cient method to evaluate the location
and brightness of the cuto for a wide class of driver waveforms by solving a single saddle-point
equation. It also allows us to explore the intricate topologies of the Riemann surfaces formed by
the quantum orbits induced by nontrivial waveforms.
CitacióPisanty, E.; Ciappina, M.F.; Lewenstein, M. The imaginary part of the high-harmonic cuto. "Journal of Physics: Photonics", 22 Juliol 2020, vol. 2, núm. 34013, p. 1-21.
Versió de l'editorhttps://iopscience.iop.org/article/10.1088/2515-7647/ab8f1e
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