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Proceedings Paper

Anomalous Behavior Of The Reflectivity Of Metals Irradiated With 10.6 µm Laser Pulses
Author(s): Craig T. Walters
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Paper Abstract

Anomalous behavior of the specular reflectivity of polished metal surfaces subjected to intense CO2 laser pulses is reported. Irradiations of several metallic elements and alloys were conducted in hard vacuum and time-resolved measurements of specular reflectivity were performed during the 60-ns pulse. Results indicated in many cases a transient drop in reflectivity to a level in the 10-40% range followed by recovery to near unity by the end of the pulse for a stabilized surface. Metal vapor plasma was not detected in most cases and is not believed to be the dominant mechanism operative. Theoretical estimates of surface temperature transients are presented along with correlations of observed surface damage. Mechanisms which may explain the observed anomaly are discussed.

Paper Details

Date Published: 24 January 1980
PDF: 11 pages
Proc. SPIE 0198, Laser Applications in Materials Processing, (24 January 1980); doi: 10.1117/12.958026
Show Author Affiliations
Craig T. Walters, Battelle Columbus Laboratories (United States)

Published in SPIE Proceedings Vol. 0198:
Laser Applications in Materials Processing
John F. Ready, Editor(s)

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