Comparing flat top and Gaussian focal beam shapes when micromachining steel

Todd E. Lizotte; Orest Ohar

doi:10.1117/12.895955

7 September 2011 Comparing flat top and Gaussian focal beam shapes when micromachining steel

Todd E. Lizotte, Orest Ohar

Proceedings Volume 8130, Laser Beam Shaping XII; 81300G (2011) https://doi.org/10.1117/12.895955
Event: SPIE Optical Engineering + Applications, 2011, San Diego, California, United States

Abstract

Laser micromachining, drilling and marking is extensively used within the aerospace, automotive and firearms industries. The unique properties of lasers make them ideal tools for micromachining a wide diversity of materials, including steel alloys [1]. We describe the results of micromachining of low carbon steel and stainless steel alloys, using a high powered diode pumped solid state (DPSS) laser operating at a wavelength of 355nm. The laser was configured with beam conditioning optics to produce either a flat top beam or a Gaussian output which was then sent through a galvanometer scanner and telecentric lens beam delivery system. This paper outlines the interrelationship of process variables when micromachining fine features in steel and stainless steel alloys. Process variables measured included the optimum laser focus plane, energy density, galvanometer scan rate, and pulse overlap and focal spot diameter. Optimum process performance was evaluated based on a dimensional comparison of the micromachined features from each test coupon, including uniformity and surface roughness of the micromachined surface and the minimization of surface irregularities (stalagmite type slag / debris / corn row patterns) and taper angle of the micromachined feature side walls.

Citation Download Citation

Todd E. Lizotte and Orest Ohar "Comparing flat top and Gaussian focal beam shapes when micromachining steel", Proc. SPIE 8130, Laser Beam Shaping XII, 81300G (7 September 2011); https://doi.org/10.1117/12.895955

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