Principal frequency of an ultrashort laser pulse

Enrique G. Neyra; Pablo Vaveliuk; Emilio Pisanty; Andrew S. Maxwell; MacIej Lewenstein; Marcelo F. Ciappina

doi:10.1103/PhysRevA.103.053124

Principal frequency of an ultrashort laser pulse

Enrique G. Neyra, Pablo Vaveliuk, Emilio Pisanty, Andrew S. Maxwell, MacIej Lewenstein, Marcelo F. Ciappina

Physics

Research output: Contribution to journal › Article › peer-review

6 Scopus citations

Abstract

We introduce an alternative definition of the main frequency of an ultrashort laser pulse - the principal frequency ωP. This parameter is complementary to the most accepted and widely used carrier frequency ω0. Given the fact that these ultrashort pulses, also known as transients, have a temporal width comprising only a few cycles of the carrier wave, corresponding to a spectral bandwidth Δω covering several octaves, ωP describes, in a more precise way, the dynamics driven by these sources. We present examples where, for instance, ωP is able to correctly predict the high-order harmonic cutoff independent of the carrier envelope phase. This is confirmed by solving the time-dependent Schrödinger equation in reduced dimensions, supplemented with the time-analysis of the quantum spectra, where it is possible to observe how the subcycle electron dynamics is better described using ωP. The concept of ωP, however, can be applied to a large variety of scenarios, not only within the strong-field physics domain.

Original language	English
Article number	053124
Journal	Physical Review A
Volume	103
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevA.103.053124
State	Published - May 2021

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title = "Principal frequency of an ultrashort laser pulse",

abstract = "We introduce an alternative definition of the main frequency of an ultrashort laser pulse - the principal frequency ωP. This parameter is complementary to the most accepted and widely used carrier frequency ω0. Given the fact that these ultrashort pulses, also known as transients, have a temporal width comprising only a few cycles of the carrier wave, corresponding to a spectral bandwidth Δω covering several octaves, ωP describes, in a more precise way, the dynamics driven by these sources. We present examples where, for instance, ωP is able to correctly predict the high-order harmonic cutoff independent of the carrier envelope phase. This is confirmed by solving the time-dependent Schr{\"o}dinger equation in reduced dimensions, supplemented with the time-analysis of the quantum spectra, where it is possible to observe how the subcycle electron dynamics is better described using ωP. The concept of ωP, however, can be applied to a large variety of scenarios, not only within the strong-field physics domain.",

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AU - Neyra, Enrique G.

AU - Vaveliuk, Pablo

AU - Pisanty, Emilio

AU - Maxwell, Andrew S.

AU - Lewenstein, MacIej

AU - Ciappina, Marcelo F.

PY - 2021/5

Y1 - 2021/5

N2 - We introduce an alternative definition of the main frequency of an ultrashort laser pulse - the principal frequency ωP. This parameter is complementary to the most accepted and widely used carrier frequency ω0. Given the fact that these ultrashort pulses, also known as transients, have a temporal width comprising only a few cycles of the carrier wave, corresponding to a spectral bandwidth Δω covering several octaves, ωP describes, in a more precise way, the dynamics driven by these sources. We present examples where, for instance, ωP is able to correctly predict the high-order harmonic cutoff independent of the carrier envelope phase. This is confirmed by solving the time-dependent Schrödinger equation in reduced dimensions, supplemented with the time-analysis of the quantum spectra, where it is possible to observe how the subcycle electron dynamics is better described using ωP. The concept of ωP, however, can be applied to a large variety of scenarios, not only within the strong-field physics domain.

AB - We introduce an alternative definition of the main frequency of an ultrashort laser pulse - the principal frequency ωP. This parameter is complementary to the most accepted and widely used carrier frequency ω0. Given the fact that these ultrashort pulses, also known as transients, have a temporal width comprising only a few cycles of the carrier wave, corresponding to a spectral bandwidth Δω covering several octaves, ωP describes, in a more precise way, the dynamics driven by these sources. We present examples where, for instance, ωP is able to correctly predict the high-order harmonic cutoff independent of the carrier envelope phase. This is confirmed by solving the time-dependent Schrödinger equation in reduced dimensions, supplemented with the time-analysis of the quantum spectra, where it is possible to observe how the subcycle electron dynamics is better described using ωP. The concept of ωP, however, can be applied to a large variety of scenarios, not only within the strong-field physics domain.

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Principal frequency of an ultrashort laser pulse

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