Mixed Wavelength Processing

W. O'Neill; W. M. Steen

doi:10.1117/12.950576

20 June 1989 Mixed Wavelength Processing

W. O'Neill, W. M. Steen

Proceedings Volume 1031, 7th Intl Symp on Gas Flow and Chemical Lasers; (1989) https://doi.org/10.1117/12.950576
Event: 7th International Symposium on Gas Flow and Chemical Lasers, 1988, Vienna, Austria

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

Citation Download Citation

W. O'Neill and W. M. Steen "Mixed Wavelength Processing", Proc. SPIE 1031, 7th Intl Symp on Gas Flow and Chemical Lasers, (20 June 1989); https://doi.org/10.1117/12.950576

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