Inhibition and enhancement of linear and nonlinear optical effects by conical phase front shaping for femtosecond laser material processing.

ABSTRACT: The emergence of high-powered femtosecond lasers presents the opportunity for large volume processing inside of transparent materials, wherein a myriad of nonlinear optical and aberration effects typically convolves to distort the focused beam shape. In this paper, convex and concave conical phase fronts were imposed on femtosecond laser beams and focussed into wide-bandgap glass to generate a vortex beam with tuneable Gaussian-Bessel features offset from the focal plane. The influence of Kerr lensing, plasma defocussing, and surface aberration on the conical phase front shaping were examined over low to high pulse energy delivery and for shallow to deep processing tested to 2.5 mm focussing depth. By isolating the underlying processes, the results demonstrate how conical beams can systema

SUBMITTER: Alimohammadian E 

PROVIDER: S-EPMC7726100 | biostudies-literature | 2020 Dec

REPOSITORIES: biostudies-literature