Brillouin backscattering from a double‐pulse CO2laser incident on planar targets
作者:
R. Decoste,
P. Lavigne,
H. Pe´pin,
G. R. Mitchel,
J.‐C. Kieffer,
期刊:
Journal of Applied Physics
(AIP Available online 1982)
卷期:
Volume 53,
issue 5
页码: 3505-3510
ISSN:0021-8979
年代: 1982
DOI:10.1063/1.331171
出版商: AIP
数据来源: AIP
摘要:
The Brillouin backscattering instability is studied for a range of preformed plasma conditions and using a CO2laser in the 1012–1013W/cm2regime. A short prepulse is incident on a planar target ahead of the main‐pulse to produce the preformed plasma. The instability appears in a short burst of back‐reflected light. Saturation of the backscatter level is observed for an individual increase of the prepulse energy, main‐pulse intensity, and prepulse‐to‐main‐pulse delay. Ion Landau damping is strong and average back‐reflected intensities are limited to less than 30% of incident. Backscattered light spectra suggest that the critical surface is involved in the backscatter process when the laser beam is at best focus onto the target surface. Otherwise, the spectral signature is similar to those obtained from underdense plasmas.
点击下载:
PDF
(456KB)
返 回