Crossed beam energy transfer in the presence of laser speckle ponderomotive self-focusing and nonlinear sound waves

Abstract

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Crossed beam energy transfer between optically smoothed laser beams in inhomogeneous plasmas

“…Another important result of these studies is the onset of temporal incoherence seen in the light beams transmitted behind the cross-interaction region. The coherence times seen in the simulation results [11] correspond to a bandwidth range on the order of 50–100 GHz, being comparable to the magnitudes of bandwidth that are currently produced by temporal smoothing techniques such as SSD at major facilities.…”

“…We will study the sensitivity of CBET on the modulation frequency and on the phase amplitude of the SSD technique, in order to understand the effect of temporal smoothing on the net energy transfer and the angular spread of the transmitted beams. We will build on the previous results (see refs [10,11]) that demonstrated plasma-induced smoothing with coherence times of 1–3 ps for RPP beams (for laser light with a wavelength of λ 0 = 0.35 µm).…”

“…As we have pointed out in ref. [11], the ponderomotive force resulting from the two beams crossing under a small angle can be subdivided into two major components ∇U = ∇U cross + ∇U self , namely ∇U cross /T e Γ ∇a 1 a * 2 e 2i|k 1 |y sin(ϑ/2) + cc. and ∇U self /T e Γ ∇(|a 1 | 2 + |a 2 | 2 ).…”

“…In our recent work [10,11] we have investigated the role of laser speckles (or laser hot spots) on CBET of two crossing spatially smoothed laser beams. We have shown that taking into account speckles of RPP beams changes considerably both (i) the energy transfer and (ii) the angular spread of transmitted light (beyond the spread defined by the optics of two crossed beam) as compared to the standard description of CBET that ignores speckle structure [12][13][14][15][16].…”

X-type Soliton, Resonance Y-type Soliton and Hybrid Solutions of a (2+1)-dimensional Hirota-Satsuma-Ito System for the Shallow Water Waves

“…Waves, one of the most common natural phenomena, have attracted people's attention [1][2][3][4][5][6]. It has been known that mechanical waves consist of the water waves, seismic waves, sound waves in air, electromagnetic waves, quantum waves, etc [7][8][9][10][11][12]. Among them, the subject of water waves has been the most fascinating and varied of all areas in the study of wave motions [13].…”