Direct measurements of an increased threshold for stimulated Brillouin scattering with polarization smoothing in ignition hohlraum plasmas

被引：29

作者：

Froula, D. H. ^{[1
]}

Divol, L. ^{[1
]}

Berger, R. L. ^{[1
]}

London, R. A. ^{[1
]}

Meezan, N. B. ^{[1
]}

Strozzi, D. J. ^{[1
]}

Neumayer, P. ^{[1
]}

Ross, J. S. ^{[1
]}

Stagnitto, S. ^{[1
]}

Suter, L. J. ^{[1
]}

Glenzer, S. H. ^{[1
]}

机构：

[1] Lawrence Livermore Natl Lab, Livermore, CA 94551 USA

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 101卷 / 11期

关键词：

D O I：

10.1103/PhysRevLett.101.115002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We demonstrate a significant reduction of stimulated Brillouin scattering by polarization smoothing in large-scale high-temperature hohlraum plasma conditions where filamentation is measured to be negligible. The stimulated Brillouin scattering experimental threshold (defined as the intensity at which 5% of the incident light is backscattered) is measured to increase by a factor of 1.7 +/- 0.2 when polarization smoothing is applied. An analytical model relevant to inertial confinement fusion plasma conditions shows that the measured reduction in backscatter with polarization smoothing results from the random spatial variation in polarization of the laser beam, not from the reduction in beam contrast.

引用

页数：4

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