Coherence properties of a smoothed laser beam in a hot plasma

Riazuelo, G.; Bonnaud, G.

doi:10.1063/1.1290447

Cited by 38 publications

(25 citation statements)

References 14 publications

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“…The time integrated imaging of the foil x-ray emission showed that the foam modifies the initial spatial pattern by smearing out the large laser scale perturbations. The role of parametric instabilities in the laser beam smoothing by an underdense plasma has been confirmed in numerical simulations with the electromagnetic paraxial code Parax [23]. The time dependence of the beam intensity pattern behind the foam leads to a lower imprinted perturbation amplitude associated with the spectrum shifted to shorter wavelengths.…”

Section: Introductionmentioning

confidence: 79%

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Simulations of laser imprint reduction using underdense foams and its consequences on the hydrodynamic instability growth

et al. 2013

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The mechanisms of laser imprint reduction on a surface of a planar foil performed using an underdense foam are presented. The consequences on the Rayleigh-Taylor instability growth at the ablation front when the foil is accelerated are studied. The analysis is based on numerical simulations using a chain of codes: the electromagnetic paraxial code Parax provides the modifications of the intensity perturbation spectrum while the laser beam is crossing the foam. Two-dimensional axially symmetric simulations with the radiation hydrodynamic code CHIC describe the foam expansion and the foil dynamics. Finally, the perturbed flow calculations and the instability growth are investigated with the two-dimensional CHIC version in the planar geometry 6

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Section: Introductionmentioning

confidence: 79%

“…The simulations of the plasma-induced laser-beam smoothing have been performed with the massively parallel code Parax [17,23,31] that describes the laser beam propagation in the paraxial approximation in three spatial directions. The aim was to characterize the foam plasma effect on the laser intensity distribution.…”

Section: Plasma-induced Laser-beam Smoothingmentioning

confidence: 99%

Simulations of laser imprint reduction using underdense foams and its consequences on the hydrodynamic instability growth

et al. 2013

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“…A large broadband laser is desired since the amount of bandwidth determines the rate of smoothing, which must be accomplished before the target can significantly respond to the laser nonuniformity [5,6,8]. Second, a large laser bandwidth can significantly reduce parametric instabilities in high-intensity laser-plasma interaction (LPI), such as stimulated Raman scattering and simulated Brillouin scattering [12][13][14][15][16][17][18]. These parametric instabilities can cause poor coupling of laser beams onto the target.…”

Section: Introductionmentioning

confidence: 99%

Generation of broadband laser by high-frequency bulk phase modulator with multipass configuration

et al. 2014

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A new technique is presented for obtaining a large broadband nanosecond-laser pulse. This technique is based on multipass phase modulation of a single-frequency nanosecond-laser pulse from the integrated front-end source, and it is able to shape the temporal profile of the pulse arbitrarily, making this approach attractive for high-energy-density physical experiments in current laser fusion facilities. Two kinds of cavity configuration for multipass modulation are proposed, and the performances of both of them are discussed theoretically in detail for the first time to our knowledge. Simulation results show that the bandwidth of the generated laser pulse by this approach can achieve more than 100 nm in principle if adjustment accuracy of the time interval between contiguous passes is controlled within 0.1% of a microwave period. In our preliminary experiment, a 2 ns laser pulse with 1.35-nm bandwidth in 1053 nm is produced via this technique, which agrees well with the theoretical result. Owing to an all-solid-state structure, the energy of the pulse achieves 25 μJ. In the future, with energy compensation and spectrum filtering, this technique is expected to generate a nanosecond-laser pulse of 3 nm or above bandwidth with energy of about 100 μJ.

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“…where D 0 is the part of D 0 which is contained in the region between the boundary Γ in and the caustic surface C. The reader is referred to [7] for details on this analysis and for a direct numerical method to deal with (38) by using (40), (41).…”

Section: About the Advection Equationmentioning

confidence: 99%

“…We sketch briefly in Section 4.4 some features concerning the numerical methods for this model. Numerous paraxial models of this type have been used for a long time in laser-plasma interaction, see for example [3,10,22,40]. For the introduction of the paraxial approximation with a non zero incident angle see [20].…”

Section: Introductionmentioning

confidence: 99%

Mathematical models for laser-plasma interaction

Sentis¹

2005

ESAIM: M2AN

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Abstract. We address here mathematical models related to the Laser-Plasma Interaction. After a simplified introduction to the physical background concerning the modelling of the laser propagation and its interaction with a plasma, we recall some classical results about the geometrical optics in plasmas. Then we deal with the well known paraxial approximation of the solution of the Maxwell equation; we state a coupling model between the plasma hydrodynamics and the laser propagation. Lastly, we consider the coupling with the ion acoustic waves which has to be taken into account to model the so called Brillouin instability. Here, besides the macroscopic density and the velocity of the plasma, one has to handle the space-time envelope of the main laser wave, the space-time envelope of the stimulated Brillouin backscattered laser wave and the space envelope of the Brillouin ion acoustic waves. Numerical methods are also described to deal with the paraxial model and the three-wave coupling system related to the Brillouin instability.Mathematics Subject Classification. 35Q55, 35Q60, 65M06, 34E20, 82D10.

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Coherence properties of a smoothed laser beam in a hot plasma

Cited by 38 publications

References 14 publications

Simulations of laser imprint reduction using underdense foams and its consequences on the hydrodynamic instability growth

Simulations of laser imprint reduction using underdense foams and its consequences on the hydrodynamic instability growth

Generation of broadband laser by high-frequency bulk phase modulator with multipass configuration

Mathematical models for laser-plasma interaction

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