Product Code: ICAL08_902

Beam Intensity Profile Modulation for Even Surface Treatment: Finite Element Modelling and Optical Design
Authors:
Dan Wellburn, University of Liverpool; Liverpool Great Britain
Martin Sharp, University of Liverpool; Birkenhead Great Britain
William Steen, University of Liverpool; Liverpool Great Britain
Nick Ellis, ULO Optics Ltd; Stevenage Great Britain
Geoff Dearden, University of Liverpool; Liverpool Great Britain
Ken Watkins, University of Liverpool; Liverpool Great Britain
Presented at ICALEO 2008

Common laser surface treatment problems arise when using a Gaussian or Top-Hat beam intensity profile to attempt to create an even surface temperature distribution pattern (or heat affected zone) in a given material. Annular ring shaped beams have gone some way to achieving a more even temperature distribution and have improved process design in fields such as laser surface hardening and laser welding. The temperature distribution patterns created using various annular ring beam profiles are examined. The effect of varying the Péclet number on the resultant temperature distribution pattern is modelled using a finite element modelling package. An investigation of the relationship between process tolerance levels and the optimum Péclet number for even treatment of surfaces is included for a number of different annular beam intensity profiles. Feature addition to and modulation of an annular beam intensity profile is examined in an attempt to achieve an even temperature distribution pattern with well defined edges even at high Péclet numbers. Modulation of intensity profile is achieved through an optical design which includes only conventional compound optics. Aspects of the model and optical design are tested by traverse beam printing in Perspex with a CO2 laser.

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