Anomalous Behavior Of The Reflectivity Of Metals Irradiated With 10.6 µm Laser Pulses

Craig T. Walters

doi:10.1117/12.958026

24 January 1980 Anomalous Behavior Of The Reflectivity Of Metals Irradiated With 10.6 µm Laser Pulses

Craig T. Walters

Proceedings Volume 0198, Laser Applications in Materials Processing; (1980) https://doi.org/10.1117/12.958026
Event: 23rd Annual Technical Symposium, 1979, San Diego, United States

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.

Citation Download Citation

Craig T. Walters "Anomalous Behavior Of The Reflectivity Of Metals Irradiated With 10.6 µm Laser Pulses", Proc. SPIE 0198, Laser Applications in Materials Processing, (24 January 1980); https://doi.org/10.1117/12.958026

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