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Proceedings Paper

Mixed Wavelength Processing
Author(s): W. O'Neill; W. M. Steen
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Paper Abstract

The fundamental process which determines the efficiency of laser materials processing is the absorption of the high power laser beam at the materials surface. Coupling photons into the surface of a metal mainly involves the interaction of photons with the conduction electrons in the surface layer. Excited electrons are then scattered by phonons and lattice defects with the conversion of electronic energy derived from the light flux into heat. Due to the low efficiency of this process metals have,in general, a high reflectivity to optical radiation . At present high power CO2 lasers are used to process various materials although higher than average reflectivity metals such as Cu and Al have proved difficult to treat with CO2 lasers, in addtion anti-reflection coatings are usually required for transformation hardening. Enhanced beam coupling of a Ferranti 400w cw CO2 laser beam has been observed on Cu and Al surfaces via interaction with a plasma generated by a Lumonics Excimer laser. This paper presents the initial results of the experimental investigation into mixed wavelength processing

Paper Details

Date Published: 20 June 1989
PDF: 8 pages
Proc. SPIE 1031, 7th Intl Symp on Gas Flow and Chemical Lasers, (20 June 1989); doi: 10.1117/12.950576
Show Author Affiliations
W. O'Neill, University of Liverpool (United Kingdom)
W. M. Steen, University of Liverpool (United Kingdom)

Published in SPIE Proceedings Vol. 1031:
7th Intl Symp on Gas Flow and Chemical Lasers
Dieter Schuoecker, Editor(s)

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