Characterization of laser‐produced plasma density profiles using grid image refractometry
作者:
R. S. Craxton,
F. S. Turner,
R. Hoefen,
C. Darrow,
E. F. Gabl,
Gar. E. Busch,
期刊:
Physics of Fluids B: Plasma Physics
(AIP Available online 1993)
卷期:
Volume 5,
issue 12
页码: 4419-4431
ISSN:0899-8221
年代: 1993
DOI:10.1063/1.860558
出版商: AIP
数据来源: AIP
摘要:
Grid image refractometry (GIR) is proposed as a technique for determining the two‐dimensional density profiles of long scale‐length laser‐produced plasmas. Its distinctive feature is that an optical probe beam is broken up into ‘‘rays’’ by being passed through a grid before traversing the plasma. The refraction angles of the rays are measured by imaging the plasma at two or more object planes and are integrated to yield the phase front. For cylindrically symmetric plasmas the density profile is then determined using Abel inversion. The feasibility of GIR is illustrated by an experiment in which a thick CH target was irradiated with ∼100 J of 527 nm radiation and diagnosed with a 20 ps, 263 nm probe. The resulting density profile is substantially larger than any that have previously been reported using interferometry and compares quite closely with hydrodynamic simulations.
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