Saturation of cross-beam energy transfer for multispeckled laser beams involving both ion and electron dynamics

Crossed beam energy transfer, CBET, in high-intensity laser–plasma interaction is investigated for the case of optically smoothed laser beams. In the two approaches to laser-driven inertial confinement fusion experiments, the direct-drive and the indirect-drive, CBET is of great importance because it governs the coupling of laser energy to the plasma. We use the two-dimensional wave-coupling code H armony to simulate the transfer between two laser beams with speckle structure that overlap in a plasma with an inhomogeneous flow profile. We compare the CBET dynamics for laser beams with spatial incoherence and with spatio-temporal incoherence; in particular we apply the smoothing techniques using random phase plates (RPPs) and smoothing by spectral dispersion (SSD), respectively. It is found that for laser beams (wavelength λ 0 ) with intensities ( I L ) above I L ∼ 2 × 10 15 W cm −2 ( λ 0 /0.35 µm) −2 ( T e /keV), both the so-called plasma-induced smoothing as well as self-focusing in intense laser speckles induce temporal incoherence; the latter affects the CBET and the angular distribution of the light transmitted behind the zone of beam overlap. For RPP-smoothed incident beams, the resulting band width of the transmitted light can already be of the same order as the effective band width of the SSD available at major laser facilities. We examine the conditions when spatio-temporal smoothing techniques become efficient for CBET. This article is part of a discussion meeting issue ‘Prospects for high gain inertial fusion energy (part 1)’.

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Full-wave and ray-based modeling of cross-beam energy transfer between laser beams with distributed phase plates and polarization smoothing

Physics of Plasmas ◽

10.1063/1.4998713 ◽

2017 ◽

Vol 24 (10) ◽

pp. 103128 ◽

Cited By ~ 8

Author(s):

R. K. Follett ◽

D. H. Edgell ◽

D. H. Froula ◽

V. N. Goncharov ◽

I. V. Igumenshchev ◽

...

Keyword(s):

Energy Transfer ◽

Beam Energy ◽

Laser Beams ◽

Full Wave ◽

Phase Plates

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Forward and backward stimulated Raman scattering in multi-speckled beams: Density dependence and effects on cross-beam energy transfer

Physics of Plasmas ◽

10.1063/5.0022091 ◽

2021 ◽

Vol 28 (2) ◽

pp. 022702

Author(s):

D. J. Stark ◽

L. Yin ◽

B. J. Albright ◽

A. Seaton ◽

R. F. Bird

Keyword(s):

Energy Transfer ◽

Raman Scattering ◽

Density Dependence ◽

Beam Energy ◽

Stimulated Raman Scattering ◽

Stimulated Raman

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Validation of nonlinear physics in cross-beam energy transfer

10.2172/1781350 ◽

2021 ◽

Author(s):

Lin Yin

Keyword(s):

Energy Transfer ◽

Beam Energy

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A Review of the Theory and Application of Coherent Anti-Stokes Raman Spectroscopy (CARS)

Applied Spectroscopy ◽

10.1366/000370277774463625 ◽

1977 ◽

Vol 31 (4) ◽

pp. 253-271 ◽

Cited By ~ 398

Author(s):

W. M. Tolles ◽

J. W. Nibler ◽

J. R. McDonald ◽

A. B. Harvey

Keyword(s):

Raman Spectroscopy ◽

Energy Transfer ◽

Atmospheric Chemistry ◽

Reaction Dynamics ◽

Fluctuation Phenomena ◽

Laser Beams ◽

Nonlinear Conversion ◽

Future Direction ◽

Anti Stokes ◽

Raman Beam

Coherent anti-Stokes Raman spectroscopy (CARS) is a relatively new kind of Raman spectroscopy which is based on a nonlinear conversion of two laser beams into a coherent, laser-like Raman beam of high intensity in the anti-Stokes region. The emission is often many orders of magnitude greater than normal Raman scattering and, because of the coherent and anti-Stokes character of radiation, the method is very useful for obtaining Raman spectra of fluorescing samples, gases in discharges, plasmas, combustion, atmospheric chemistry. In this paper we outline the basic theory behind CARS and describe its unusual effects and drawbacks. We review the research to date on various materials, and indicate the possible future direction, utility and applications of CARS such as surface studies, fluctuation phenomena, reaction dynamics, photochemistry, kinetics, relaxation, and energy transfer.

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Energy transfer between laser beams due to recording of optical axis gratings in liquid crystals

Journal of the Optical Society of America B ◽

10.1364/josab.23.002113 ◽

2006 ◽

Vol 23 (10) ◽

pp. 2113 ◽

Cited By ~ 2

Author(s):

Sarik R. Nersisyan ◽

Nelson V. Tabiryan ◽

C. Martin Stickley

Keyword(s):

Energy Transfer ◽

Liquid Crystals ◽

Optical Axis ◽

Laser Beams

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A new experimental setup for high-throughput controlled non-photochemical laser-induced nucleation: application to glycine crystallization

Journal of Applied Crystallography ◽

10.1107/s160057671401098x ◽

2014 ◽

Vol 47 (4) ◽

pp. 1252-1260 ◽

Cited By ~ 14

Author(s):

Bertrand Clair ◽

Aziza Ikni ◽

Wenjing Li ◽

Philippe Scouflaire ◽

Vincent Quemener ◽

...

Keyword(s):

Energy Density ◽

Laser Beam ◽

High Throughput ◽

Beam Energy ◽

Laser Beams ◽

Experimental Setup ◽

Field Of Study ◽

Technical Description ◽

Beam Energy Density

Non-photochemical laser-induced nucleation (NPLIN) has been a growing field of study since 1996, and more than 40 compounds including organics, inorganics and proteins have now been probed under various conditions (solvents, laser types, laser beamsetc.). The potential advantages of using this technique are significant, in particular polymorphic control. To realize these benefits, the objective is a carefully designed experimental setup and highly controlled parameters, for example temperature and energy density, in order to reduce the uncertainty regarding the origin of nucleation. In this paper, a new experimental setup designed to study NPLIN is reported. After a full technical description of the present setup, the different functionalities of this device will be illustrated through results on glycine. Glycine crystals obtained through NPLIN nucleate at the meniscus and exhibit different morphologies. The nucleation efficiency, as a function of the supersaturation of the solution used and the laser beam energy density, has also been established for a large number of samples, with all other parameters held constant.

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