Light Propagation in Field-Ionizing Media: Extreme Nonlinear Optics

Geissler, Michael; Tempea, G.; Scrinzi, Armin; Schnürer, M.; Krausz, Ferenc; Brabec, Thomas

doi:10.1103/physrevlett.83.2930

Cited by 230 publications

(138 citation statements)

References 21 publications

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“…I do not require a moving frame, a smooth envelope, or to assume inconvenient second order derivatives are somehow negligible: all these are frequently required in standard treatments, and even extensions use them [19,26,27,30,31,39]. The approximation is that the residual terms are weak compared to the (underlying) ±ıβ E term -e.g.…”

Section: Uni-directional Wave Equationsmentioning

confidence: 99%

Optical pulse propagation with minimal approximations

2010

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Propagation equations for optical pulses are needed to assist in describing applications in ever more extreme situations -including those in metamaterials with linear and nonlinear magnetic responses. Here I show how to derive a single first order propagation equation using a minimum of approximations and a straightforward "factorization" mathematical scheme. The approach generates exact coupled bi-directional equations, after which it is clear that the description can be reduced to a single uni-directional first order wave equation by means of a simple "slow evolution" approximation, where the optical pulse changes little over the distance of one wavelength. It also also allows a direct term-to-term comparison of an exact bi-directional theory with the approximate uni-directional theory.

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Section: Uni-directional Wave Equationsmentioning

confidence: 99%

Optical pulse propagation with minimal approximations

2010

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“…To analyze the evolution of high-intensity few-cycle light pulses in an ionizing gas, we employ the framework of slowly evolving wave approximation (SEWA) [16], adapted to include ionization effects [17,18]. Our SEWA-based model of few-cycle pulse propagation involves a numerical solution of the following equation for the evolution of the field E:…”

Section: Theoretical Frameworkmentioning

confidence: 99%

Generation of supercontinuum compressible to single-cycle pulse widths in an ionizing gas

2008

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Generation of supercontinuum compressible to single-cycle pulse widths in an ionizing gas Abstract. Analysis of the evolution of submillijoule few-cycle light pulses in an ionizing gas reveals physical mechanisms and scenarios enabling the generation of high-intensity supercontinuum radiation compressible to singlecycle pulse widths. The main properties of supercontinuum generation in this regime are analyzed by numerically solving a spatiotemporal evolution equation for a few-cycle light field adapted to include ultrafast ionization phenomena in a gas medium. The enhancement of ionization-induced phase shifts and shockwave effects, which is inherent in few-cycle fields, is shown to be the key factor for a substantial intensification of the high-frequency wing of the spectrum, giving rise to broadband radiation with appropriate spectral phase profiles that can be compressed to single-cycle pulses upon an accurate temporal and spatial chirp compensation. The dynamics of few-cycle light fields in an ionizing gas is shown to be sensitive to the initial pulse width, pulse shape and ionization regime.

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“…The three-dimensional Maxwell's wave equation for the xuv light in the gas medium is [24,[34][35][36][37]]…”

Section: Theoretical Methodsmentioning

confidence: 99%

Intensity dependence of multiple orbital contributions and shape resonance in high-order harmonic generation of aligned N2molecules

et al. 2012

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We report measurements and theoretical simulations of high-order harmonic generation (HHG) in aligned N 2 molecules using a 1200-nm intense laser field when the generating pulse is perpendicular to the aligning one. With increasing laser intensity, the minimum in the HHG spectra first shifts its position and then disappears. Theoretical simulations including the macroscopic propagation effects in the medium reproduce these observations and the disappearance of the minimum is attributed to the additional contribution of HHG from inner orbitals. We also predict that the well-known shape resonance in the photoionization spectra of N 2 should exist in the HHG spectra. It is most clearly seen when the generating laser is parallel to the aligning one and disappears gradually as the angle between the two lasers increases. No clear evidence of this shape resonance has been reported so far when using lasers with different wavelengths. Further experimentation is needed to draw conclusions.

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Light Propagation in Field-Ionizing Media: Extreme Nonlinear Optics

Cited by 230 publications

References 21 publications

Optical pulse propagation with minimal approximations

Optical pulse propagation with minimal approximations

Generation of supercontinuum compressible to single-cycle pulse widths in an ionizing gas

Intensity dependence of multiple orbital contributions and shape resonance in high-order harmonic generation of aligned N2molecules

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