Modeling of Gaussian-to-annular beam shaping by geometrical optics for optical trepanning

Danyong Zeng; William Pete Latham; Aravinda Kar

doi:10.1117/12.561084

29 September 2004 Modeling of Gaussian-to-annular beam shaping by geometrical optics for optical trepanning

Danyong Zeng, William Pete Latham, Aravinda Kar

Proceedings Volume 5525, Laser Beam Shaping V; (2004) https://doi.org/10.1117/12.561084
Event: Optical Science and Technology, the SPIE 49th Annual Meeting, 2004, Denver, Colorado, United States

Abstract

Laser drilling is very important in many industries such as automotive, aerospace, electronics and materials processing. It can be used to produce critical components with novel hole geometry for advanced systems. Percussion drilling and trepanning are two laser drilling methods. In the conventional trepanning method, a laser beam in scanned along a circular or spiral orbit to remove material to achieve a desired hole shape. These orbits generally trace a circular path at the inner wall of the holes. This suggests that an annular beam can be used to accomplish trepanning, which we referred to as optical trepanning. The ray tracing technique of geometrical optics will be employed in this paper to design the necessary optics to transform a Gaussian laser beam into an annular beam of different intensity profiles. Such profiles include half Gaussian with maximum intensities at the inner and outer surfaces of the annulus, respectively, and full Gaussian with maximum intensity within the annulus.

Citation Download Citation

Danyong Zeng, William Pete Latham, and Aravinda Kar "Modeling of Gaussian-to-annular beam shaping by geometrical optics for optical trepanning", Proc. SPIE 5525, Laser Beam Shaping V, (29 September 2004); https://doi.org/10.1117/12.561084

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