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Title:Extinction of 10.6 μm laser radiation by free electrons in an argon discharge at atmospheric pressure
Author(s):Park, Sehyun
Advisor(s):Eden, James Gary
Department / Program:Electrical & Computer Eng
Discipline:Electrical & Computer Engr
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Inverse Bremsstrahlung Negative lens effect Stark Broadening
Abstract:Experiments will be described in which the extinction of 10.6 μm photons by free electrons in a single filamentary discharge is studied. The extinction ranges from 3 to 10 percent over a path length of 1 cm, depending on the argon flow rate. The spatio-temporally averaged electron density in the filament is more than 10^15 cm^(-3), as determined by Stark broadening of the hydrogen alpha (656.28 nm) and 4p'[1/2]-4s[3/2]^0 argon I (696.54 nm) lines. Experiments indicate that the observed extinction of 10.6 μm is attributable to a combination of inverse bremsstrahlung and a negative lens effect, and the results will be compared to theoretical calculations based on Boltzmann's equation. The potential application of such high electron density plasmas to studies of fundamental plasma phenomena, as well as optical applications, will be discussed.
Issue Date:2016-07-18
Rights Information:Copyright 2016 Sehyun Park
Date Available in IDEALS:2016-11-10
Date Deposited:2016-08

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