Enhancing the absorption of aluminum alloys by irradiation with an excimer laser

Graeme Scott; Stewart W. Williams; P. C. Morgan; M. Dempster

doi:10.1117/12.184770

7 September 1994 Enhancing the absorption of aluminum alloys by irradiation with an excimer laser

Graeme Scott, Stewart W. Williams, P. C. Morgan, M. Dempster

Proceedings Volume 2207, Laser Materials Processing: Industrial and Microelectronics Applications; (1994) https://doi.org/10.1117/12.184770
Event: Europto High Power Lasers and Laser Applications V, 1994, Vienna, Austria

Abstract

Aluminum alloys typically have as received reflectivities of 85 - 95% at 10.6 micrometers making many laser processes difficult or impossible. These values have been reduced to as low as 1 - 2% by optimizing the processing parameters of an excimer laser used to modify the surface structure of 8090 and 2024 Al alloys and pure Al prior to their exposure to a CO₂ laser. The most significant excimer processing parameters were found to be the scan pattern of the excimer beam, the number of pulses per scan pattern step (dwell time) and the laser fluence. Optimizing these parameters allows the production of a rough oxide rich surface and reflectivities at 10.6 micrometers routinely below 10%. Preliminary results are presented from the practical implementation of the technique to a dual wavelength (CO₂/excimer) cutting system. Increases in cutting speeds of between 2 - 4 times are demonstrated with 8090 Al-Li alloy using dual wavelength laser processing.

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Graeme Scott, Stewart W. Williams, P. C. Morgan, and M. Dempster "Enhancing the absorption of aluminum alloys by irradiation with an excimer laser", Proc. SPIE 2207, Laser Materials Processing: Industrial and Microelectronics Applications, (7 September 1994); https://doi.org/10.1117/12.184770

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