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Femtosecond Laser-shockwave Induced Densification in Fused Silica by Radhakrishnan, Arunkrishnan; Gateau, Julien; Vlugter, Pieter; Bellouard, Yves is a scholarly article available to read on EtoBox.

What is Femtosecond Laser-shockwave Induced Densification in Fused Silica about?

Tightly focused femtosecond laser-beam in the non-ablative regime can induce a shock-wave enough to reach locally pressures in the giga-Pascal range or more. In a single beam configuration, the location of the highest-pressure zone is nested within the laser-focus zone, making it difficult to differentiate the effect of the shock-wave pressure from photo-induced and plasma relaxation effect. To circumvent this difficulty, we consider two spatially separated focused beams that individually act as quasi-simultaneous pressure-wave emitters. The zone where both shock-waves interfere constructively forms a region of extreme pressure range, physically separated from the regions under direct laser exposure. Here, we present evidences of pressured-induced densification in fused silica in between the foci of the two beams, which can be exclusively attributed to the superposition of the pressure waves emitted by each focused laser-beam. Specifically, we show how the beams gap and pulses time-delay affect the structural properties of fused silica using Raman characterization, beam deflection technique, and selective etching techniques. The method is generic and can be implemented in a variety

Author

Radhakrishnan, Arunkrishnan; Gateau, Julien; Vlugter, Pieter; Bellouard, Yves

Published

2022

Language

EN