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Proceedings Paper

Thomson scattering measurements in optically ionized gases produced by high-intensity KrF laser radiation
Author(s): Allen A. Offenberger; W. J. Blyth; Michael H. Key; J. Wark; Z. Najmudin; A. E. Dangor
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Paper Abstract

Experiments are reported on optical ionization of gases produced by 12 ps pulses of focused KrF laser radiation at intensities of 3 X 1017 W/cm2. Simultaneous measurements of Thomson, stimulated Raman and stimulated Brillouin scattering have been used to determine the electron energy distribution and temperature in He and Ne (static and pulsed gas jet targets) at pressures of 10-3 - 1 bar. The electron velocity distribution evolves from a multiphoton ionization spectrum at low pressure to a thermal electron distribution at higher pressure. The ion determined portion of the Thomson scattered spectrum is highly non-thermal for pressures > a few mbar. At high pressure, significant Raman and Brillouin backscattering are observed. The results show that inverse bremsstrahlung absorption dominates heating for p > 10-2 bar except at the highest pressures where SRS may also be important.

Paper Details

Date Published: 8 July 1993
PDF: 8 pages
Proc. SPIE 1860, Short-Pulse High-Intensity Lasers and Applications II, (8 July 1993); doi: 10.1117/12.147564
Show Author Affiliations
Allen A. Offenberger, Univ. of Oxford (Canada)
W. J. Blyth, Univ. of Oxford (United Kingdom)
Michael H. Key, Univ. of Oxford (United States)
J. Wark, Univ. of Oxford (United Kingdom)
Z. Najmudin, Imperial College of Science, Technology and Medicine (United Kingdom)
A. E. Dangor, Imperial College of Science, Technology and Medicine (United Kingdom)

Published in SPIE Proceedings Vol. 1860:
Short-Pulse High-Intensity Lasers and Applications II
Hector A. Baldis, Editor(s)

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