scholarly journals Order statistics and extreme properties of spatially smoothed laser beams in laser-plasma interaction

2010 ◽  
Vol 28 (3) ◽  
pp. 463-477 ◽  
Author(s):  
S. Hüller ◽  
A. Porzio
Keyword(s):  
Distribution Function ◽  
Numerical Simulations ◽  
Order Statistics ◽  
Brillouin Scattering ◽  
Hot Spot ◽  
Nonlinear Processes ◽  
Laser Plasma Interaction ◽  
Stimulated Brillouin ◽  
Hot Spot Model ◽  
Light Beams

AbstractThe order statistics of intense speckles or “laser hot spots” are studied in the context of the so-called “optically smoothed” light beams of laser-matter interaction. We investigate theoretically and by means of numerical simulations the distribution function for the k-th most intense speckle maxima in the upper tail speckle distribution. From these distributions for each order k, a distribution function for the intense speckles as a function of their peak intensity can be established, which allows to compute their impact on nonlinear processes, like parametric instabilities. This is done for the example of stimulated Brillouin scattering, using the so-called independent hot spot model, for which the backscatter reactivity level is computed, which proves to be in very good agreements with numerical simulations. This result is of great interest for nonlinear processes, like instabilities, where extreme speckles play an important role.

Stimulated Brillouin scattering and ponderomotive self‐focusing from a single laser hot spot

1995 ◽  
Vol 2 (5) ◽  
pp. 1712-1724 ◽  
Author(s):  
V. V. Eliseev ◽  
W. Rozmus ◽  
V. T. Tikhonchuk ◽  
C. E. Capjack
Keyword(s):  
Brillouin Scattering ◽  
Hot Spot ◽  
Stimulated Brillouin Scattering ◽  
Self Focusing ◽  
Single Laser ◽  
Stimulated Brillouin

Stimulated Brillouin scattering phase conjugation of light beams carrying orbit angular momentum (Invited Paper)

2017 ◽  
Vol 15 (3) ◽  
pp. 030006-30008
Author(s):  
Xudong Chen Xudong Chen ◽  
Chengcheng Chang Chengcheng Chang ◽  
and Jixiong Pu and Jixiong Pu
Keyword(s):  
Angular Momentum ◽  
Brillouin Scattering ◽  
Phase Conjugation ◽  
Stimulated Brillouin Scattering ◽  
Scattering Phase ◽  
Stimulated Brillouin ◽  
Light Beams

Numerical Treatment of short Laser Pulse Compression in transient stimulated Brillouin Scattering

2002 ◽  
Vol 7 (1) ◽  
pp. 3-29
Author(s):  
A. Dement’ev ◽  
V. Girdauskas ◽  
O. Vrublevskaja
Keyword(s):  
Laser Pulse ◽  
Pulse Compression ◽  
Brillouin Scattering ◽  
Oscillation Period ◽  
Numerical Treatment ◽  
Compression Process ◽  
Short Pulses ◽  
Nonlinear Media ◽  
Stimulated Brillouin ◽  
Light Beams

Results of numerical investigation of the compression process of short pulses during essentially nonstationary SBS are presented, taking into account the diffraction and focusing of the interacting light beams and the finite oscillation period and lifetime of hypersound waves in nonlinear media.

scholarly journals Modification of stimulated Brillouin scattering due to magnetic anisotropy in laser–plasma interaction

1998 ◽  
Vol 16 (3) ◽  
pp. 491-501 ◽  
Author(s):  
M. Khan ◽  
S. Sarkar ◽  
T. Desai ◽  
H.C. Pant
Keyword(s):  
Magnetic Anisotropy ◽  
Laser Plasma ◽  
Brillouin Scattering ◽  
Stimulated Brillouin Scattering ◽  
Wave Number ◽  
Laser Fusion ◽  
Laser Plasma Interaction ◽  
Inverse Faraday Effect ◽  
Phase Velocities ◽  
Stimulated Brillouin

Laser plasma experiments reveal rich interplay between laser plasma instabilities. The growth of stimulated Brillouin scattering (SBS) is one of the most significant constraints of laser fusion experiments. In this paper, a mechanism of stabilization of SBS process due to magnetic anisotropy has been presented. Magnetic anisotropy induced by the temporally exponentially growing nonoscillating magnetic moment from inverse Faraday effect (IFE) has been studied.It has been shown that for interaction of Nd laser (λ = 1.06 μm) on solid deuterium target the SBS growth rate (y) ∼ 3.45 ps and the phase velocities of the incident and scattered electromagnetic (EM) waves have been shown to decay exponentially (∼e∼λ1) in this SBS process resulting in wave-number mismatch.

scholarly journals Tail modulation suppression in the process of high-energy stimulated Brillouin scattering pulse compression

2016 ◽  
Vol 34 (3) ◽  
pp. 513-518 ◽  
Author(s):  
Z.H. Liu ◽  
Y.L. Wang ◽  
H.L. Wang ◽  
H. Yuan ◽  
R. Liu ◽  
...  
Keyword(s):  
Numerical Simulations ◽  
Pulse Width ◽  
Pulse Compression ◽  
Brillouin Scattering ◽  
Stimulated Brillouin Scattering ◽  
High Energy ◽  
Stimulated Brillouin

AbstractWe report that the tail modulation of Stokes pulses in the high-energy stimulated Brillouin scattering pulse compression can be suppressed by controlling effective pulse width of the pump. It is shown through numerical simulations and validated experimentally that the effective pulse width is an appropriate parameter, which determines the generation of tail modulation. The effective pulse width broaden as the increase of energy. This mechanism leads to the amplification of Stokes tail edge and it is the cause of tail modulation.

scholarly journals Study of stimulated Brillouin scattering in extended paraxial region

2012 ◽  
Vol 30 (2) ◽  
pp. 207-213 ◽  
Author(s):  
Prerana Sharma ◽  
A.K. Bhardwaj ◽  
R.P. Sharma
Keyword(s):  
Laser Beam ◽  
Brillouin Scattering ◽  
Stimulated Brillouin Scattering ◽  
Paraxial Approximation ◽  
Laser Beam Propagation ◽  
Ion Acoustic Wave ◽  
Laser Plasma Interaction ◽  
Laser Beam Profile ◽  
Axial Part ◽  
Stimulated Brillouin

AbstractThis communication presents a comparison of two cases to study the process of laser beam propagation and Stimulated Brillouin Scattering (SBS) in laser plasma interaction. These two cases are, with imposing the restriction of paraxial approximation on the laser beam and, relaxing this restriction up to a certain extent. In this work, the study done by Sharma et al. (2009) using paraxial approximation is extended by taking contribution of the off-axial rays in the laser beam profile. The spitted profile of the laser beam is obtained due to uneven focusing of the off-axial rays and its effect on localization of the ion acoustic wave (IAW) has been studied. Including the off-axial part of the laser beam semi-analytical solution of the nonlinear coupled IAW equation has been found and this is examined that off-axial part affects background densities. The nonlinear coupling between the laser beam and IAW is severely affected by modified profile of the laser beam. Further, it is investigated that the SBS is also influenced by this coupling process. Therefore, the reflectivity of SBS has been compared with and without contribution of off-axial rays. A notable change is found in the magnitude of SBS reflectivity in modified-paraxial case in comparison to the paraxial case.

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