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Laser light absorption characteristics of a laser produced hydrogen plasma

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Author
Carlisle, James Allen
Date
1972-12
Advisor
Schwirzke, F.
Second Reader
Ceglio, N. M.
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Abstract
Light from a neodymium doped glass laser was focused in hydrogen gas at pressures from 20 millitorr to 62 atmospheres in order to produce optical breakdown of the gas. In the cases where breakdown was experienced, absorption of the remainder of the laser pulse by the resulting plasma was studied. It was found that the hydrogen plasma had some very distinct absorption characteristics; in the, absorption was very small at pressures slightly exceeding the threshold for optical breakdown, and very strong at pressures above one atmosphere. There was strong evidence of a frequency shift greater than 35 angstroms of the laser light as a result of its transit through the plasma. Photographs of the forward transmitted laser intensity pulses after breakdown were compared in time with a similar pulse in which no breakdown was experienced. An effort was made to discover evidence of anomalous absorption at the plasma frequency of the laser light. The data does not conclusively support anomalous absorption in the pressure range where the plasma frequency is approximately equal to the laser light frequency. There was evidence of increased absorption at lower pressures that might be a result of an anomalous heating mechanism.
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
URI
http://hdl.handle.net/10945/16233
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  • 1. Thesis and Dissertation Collection, all items

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    Spectrometric and photographic analysis of laser-produced hydrogen plasma. 

    Wachsmuth, Kurt Dieter (Monterey, California. Naval Postgraduate School, 1973-06);
    Light from a neodymium glass laser was focused in hydrogen gas at pressures from 20 mTorrs to 9- 16 atm in order to produce optical breakdown. The forward scattered light from the breakdown region was spectrally analyzed ...
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    Unipolar arcing, a basic laser damage mechanism 

    Schwirzke, F. (Monterey, California. Naval Postgraduate School, 1985-05-05); NPS-61-83-008
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    An investigation of plasma-surface interactions on selected conductors and insulators 

    Barker, Joseph Henry III; Rush, Robert Jacque (Monterey, California. Naval Postgraduate School, 1980-12);
    Damage caused by plasma-surface interactions is of concern in fields involving the use of such plasma devices as particle beam weapons, high power lasers and controlled thermonuclear fusion reactors. Several conductors ...
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