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Optical ionization and heating of gases by intense picosecond KrF laser radiation

Published online by Cambridge University Press:  09 March 2009

A.A. Offenberger ,
W. Blyth ,
S.G. Preston ,
J.S. Wark ,
M.H. Key ,
A.E. Dangor ,
A. Modena ,
Z. Najmudin ,
A. Djaoui  and
M.H. Key
A.A. Offenberger
Affiliation:
Department of Electrical Engineering, University of Alberta, Edmonton, Alberta, Canada T6G 2G7 Department of Physics, Clarendon Laboratory, University of Oxford, Oxford OX1 3PU, United Kingdom
W. Blyth
Affiliation:
Department of Physics, Clarendon Laboratory, University of Oxford, Oxford OX1 3PU, United Kingdom
S.G. Preston
Affiliation:
Department of Physics, Clarendon Laboratory, University of Oxford, Oxford OX1 3PU, United Kingdom
J.S. Wark
Affiliation:
Department of Physics, Clarendon Laboratory, University of Oxford, Oxford OX1 3PU, United Kingdom
M.H. Key
Affiliation:
Department of Physics, Clarendon Laboratory, University of Oxford, Oxford OX1 3PU, United Kingdom
A.E. Dangor
Affiliation:
Department of Physics, Blackett Laboratory, Imperial College of Science, Technology and Medicine, London SW7 2BZ, United Kingdom
A. Modena
Affiliation:
Department of Physics, Blackett Laboratory, Imperial College of Science, Technology and Medicine, London SW7 2BZ, United Kingdom
Z. Najmudin
Affiliation:
Department of Physics, Blackett Laboratory, Imperial College of Science, Technology and Medicine, London SW7 2BZ, United Kingdom
A. Djaoui
Affiliation:
Rutherford Appleton Laboratory, Chilton Didcot, Oxon OX11 OQX, United Kingdom
M.H. Key
Affiliation:
Rutherford Appleton Laboratory, Chilton Didcot, Oxon OX11 OQX, United Kingdom
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Abstract

We report on multiphoton ionization experiments using picosecond (ps) and sub-ps UV-laser radiation at focused intensities up to 1018 W/cm2. The experiments are concerned with determining the electron temperature of optically ionized gases produced by intense KrF lasers. Thomson scattering, stimulated Raman scattering (SRS), and X-ray emission measurements have been made and compared with modeling calculations of heating. A particular objective is to identify the respective roles of above-threshold ionization, nonlinear inverse bremsstrahlung absorption, and SRS in determining the temperature of the electrons. Results for 350-fs pulses are compared with previous measurements for 12-ps pulses (for which strikingly different behavior is observed). The importance of using subps, short-wavelength lasers to minimize electron temperature is confirmed.

Type
Research Article
Information
Laser and Particle Beams , Volume 13 , Issue 1 , March 1995 , pp. 19 - 31
Copyright
Copyright © Cambridge University Press 1995

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