DocumentCode
1054304
Title
Aerosol clearing with a 10.6-um precursor pulse
Author
Lencioni, Donald E. ; Lowder, J.E.
Author_Institution
Massachusetts Institute of Technology, Lexington, MA, USA
Volume
10
Issue
2
fYear
1974
fDate
2/1/1974 12:00:00 AM
Firstpage
235
Lastpage
238
Abstract
The breakdown threshold for a 10.6-μm 200-ns laser pulse in air filled with carbon particles was increased by application of a low-intensity high-fluence precursor pulse, When the beam contained many particles with diameters 
m, the threshold was raised to within a factor of ≃3 of clean air with a 40-J/cm2precursor. With single 50-μm particles in the beam, the threshold was raised a factor of ≈19 which was within a factor of ≈2 of clean air, The mechanisms responsible for the particle clearing are shown to be the vaporization of small particles and the jetting of larger particles out of the beam. The coupling coefficient for carbon particles was found to be ≈2 dyn. s/J and the long-pulse breakdown threshold for 50-μm carbon particles was found to be 
W/cm2, with times to breakdown ranging from 1 to 15 μs.
m, the threshold was raised to within a factor of ≃3 of clean air with a 40-J/cm2precursor. With single 50-μm particles in the beam, the threshold was raised a factor of ≈19 which was within a factor of ≈2 of clean air, The mechanisms responsible for the particle clearing are shown to be the vaporization of small particles and the jetting of larger particles out of the beam. The coupling coefficient for carbon particles was found to be ≈2 dyn. s/J and the long-pulse breakdown threshold for 50-μm carbon particles was found to be W/cm2, with times to breakdown ranging from 1 to 15 μs.Keywords
Aerosols; Chemical lasers; Electric breakdown; Gas lasers; Laser applications; Laser theory; Optical mixing; Optical pulses; Optical waveguides; Waveguide lasers;
fLanguage
English
Journal_Title
Quantum Electronics, IEEE Journal of
Publisher
ieee
ISSN
0018-9197
Type
jour
DOI
10.1109/JQE.1974.1145791
Filename
1145791
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