Absorption of laser radiation in a H‐He plasma. II. Experimental measurement of the absorption coefficient

The absorption coefficients of 0.633‐, 1.15‐, and 3.39‐μm laser radiation for a homogeneous H‐He plasma have been measured in the temperature range of 12.2 to 21.7 (× 103 °K) and in the electron number density range 0.45 to 6.5 (× 1017 cm−3). Good agreement is found between the experimentally determ...

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Bibliographic Details
Published in:The Physics of fluids (1958) 1974-04, Vol.17 (4), p.759-764
Main Authors: Billman, Kenneth W., Rowley, Paul D., Stallcop, James R., Presley, Leroy
Format: Article
Language:English
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Summary:The absorption coefficients of 0.633‐, 1.15‐, and 3.39‐μm laser radiation for a homogeneous H‐He plasma have been measured in the temperature range of 12.2 to 21.7 (× 103 °K) and in the electron number density range 0.45 to 6.5 (× 1017 cm−3). Good agreement is found between the experimentally determined total absorption for each of the wavelengths and that calculated from theory. Furthermore, because the 3.39‐μm absorption is dominated by inverse bremsstrahlung while the 0.633‐μm absorption is dominated by photoionization and resonance absorption, the experiment indicates a correct assessment by the theory of these individual absorption mechanisms.
ISSN:0031-9171
2163-4998
DOI:10.1063/1.1694787