Nonlinear synthesis of complex laser waveforms at remote distances

Berti, Nicolas; Ettoumi, Wahb; Hermelin, Sylvain; Kasparian, Jérôme; Wolf, Jean‐Pierre

doi:10.1103/physreva.91.063833

Cited by 10 publications

(7 citation statements)

References 49 publications

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“…Next the same simulations were carried out throughout the full filamentation region to obtain the spectra both at the input and at the output of the filament. The numerical method and the code verification are described in detail in [38]. Briefly, the simulations are performed in cylindrically symmetric geometry, reducing the dimensionality of the problem to 2D spatial plus 1D temporal dimensions.…”

Section: Pulse Propagation Simulations Numerical Simulations Based Omentioning

confidence: 99%

“…Details of the broadband laser and pulse shaping and compression system can be found in Methods Refs [36]. and[38]. (b) shows an illustration of laser system used to generate pulse shapes: we use a frequency-doubled Nd:Vanadate laser (Verdi V5, Coherent) to pump a Ti:Sapphire oscillator (Femtosource Compact, Femtolasers) to produce 6 nJ centered at 805 nm, 90 nm bandwidth at 80 MHz.…”

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confidence: 99%

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Amplification of intense light fields by nearly free electrons

et al. 2018

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Light can be used to modify and control properties of media, as in the case of electromagnetically induced transparency or, more recently, for the generation of slow light or bright coherent XUV and X-ray radiation. Particularly unusual states of matter can be created by light fields with strengths comparable to the Coulomb field that binds valence electrons in atoms, leading to nearly-free electrons oscillating in the laser field and yet still loosely bound to the core [1,2]. These are known as Kramers-Henneberger states [3], a specific example of laser-dressed states [2]. Here, we demonstrate that these states arise not only in isolated atoms [4,5], but also in rare gases, at and above atmospheric pressure, where they can act as a gain medium during laser filamentation. Using shaped laser pulses, gain in these states is achieved within just a few cycles of the guided field. The corresponding lasing emission is a signature of population inversion in these states and of their stability against ionization. Our work demonstrates that these unusual states of neutral atoms can be exploited to create a general ultrafast gain mechanism during laser filamentation.

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Section: Pulse Propagation Simulations Numerical Simulations Based Omentioning

confidence: 99%

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confidence: 99%

Amplification of intense light fields by nearly free electrons

et al. 2018

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“…The center wavelength for the chirp expansion was chosen to be 761.22 nm which coincided with the center of the input spectrum. It is known from former studies [33,34] that only a combination of self-phase modulation, self-steepening and plasma effects leads to the measured spectra. The plasma 6 acts as a defocussing element on the beam and thereby counteracts the self-focussing by the Kerr-effect.…”

Section: Resultsmentioning

confidence: 99%

Modifications of filament spectra by shaped octave-spanning laser pulses

et al. 2018

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In this paper we examine the spectral changes in a white light laser filament due to different pulse shapes generated by a pulse shaping setup. We particularly explore how the properties of the filament spectra can be controlled by parametrically tailored white light pulses. The experiments are carried out in a gas cell with up to 9 bar of argon. Plasma generation and self-phase modulation strongly affect the pulse in the spectral and temporal domain. By exploiting these effects we show that the pulse spectrum can be modified in a desired way by either using second order parametric chirp functions to shift the filament spectrum to higher or lower wavelengths, or by optimizing pulse shapes with a genetic algorithm to generate more complex filament spectra. This paper is one of the first examples of the application of complex, parametrically shaped white light pulses.

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“…Since the electric field is linearly polarized along z, the propagation equation in the referential moving at the phase velocity v p = c/(1 + ρ at α 2 ) reduces to the unidirectional pulse propagation equation (UPPE) [66,67]:…”

Section: Methodsmentioning

confidence: 99%

Ab initio calculations of laser-atom interactions revealing harmonics feedback during macroscopic propagation

et al. 2019

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We couple the full 3D ab initio quantum evolution of the light pulse polarization in interaction with an atom with a propagation model to simulate the propagation of ultrashort laser pulses over macroscopic dimensions, in the presence of self-generated harmonics up to order 11. We evidence a clear feedback of the generated harmonics on propagation, with an influence on the ionization probability as well as the yield of the harmonic generation itself.

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Nonlinear synthesis of complex laser waveforms at remote distances

Cited by 10 publications

References 49 publications

Amplification of intense light fields by nearly free electrons

Amplification of intense light fields by nearly free electrons

Modifications of filament spectra by shaped octave-spanning laser pulses

Ab initio calculations of laser-atom interactions revealing harmonics feedback during macroscopic propagation

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