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Title: Interaction of near-IR laser radiation with plasma of a continuous optical discharge

The interaction of 1.07-μm laser radiation with plasma of a continuous optical discharge (COD) in xenon and argon at a pressure of p = 3–25 bar and temperature of T = 15 kK has been studied. The threshold power required to sustain COD is found to decrease with increasing gas pressure to P{sub t} < 30 W in xenon at p > 20 bar and to P{sub t} < 350 W in argon at p > 15 bar. This effect is explained by an increase in the coefficient of laser radiation absorption to 20−25 cm{sup –1} in Xe and 1−2 cm{sup –1} in Ar due to electronic transitions between the broadened excited atomic levels. The COD characteristics also depend on the laser beam refraction in plasma. This effect can be partially compensated by a tighter focusing of the laser beam. COD is applied as a broadband light source with a high spectral brightness.
Authors:
; ; ; ; ;  [1]
  1. Russian Academy of Sciences, A. Ishlinsky Institute for Problems in Mechanics (Russian Federation)
Publication Date:
OSTI Identifier:
22471833
Resource Type:
Journal Article
Resource Relation:
Journal Name: Plasma Physics Reports; Journal Volume: 42; Journal Issue: 1; Other Information: Copyright (c) 2016 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ARGON; BEAM-PLASMA SYSTEMS; ELECTRIC DISCHARGES; LASER RADIATION; LIGHT SOURCES; PLASMA; REFRACTION; XENON