The investigation of the presence of concentric ring structures observed after femtosecond laser ablation is presented. The ring structures have been machined using multiple pulse ablation in both kovar and silicon. Machining was done using an amplified femtosecond laser with a Gaussian spatial profile operating at a center wave length of 800 nm with pulse duration of 55fs. The ring structures have been created using a variety of lenses including biconvex, planoconvex GRIN, and achromat doublet. The cause of these ring structures are believed to be an interference effect but are not yet fully understood and are currently under investigation. These ring structures affect the machined surface roughnees. The hope is that understanding the cause of these ring structures will aid in the drilling of better quality holes.
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