Aberration-free three dimensional micromachining in glass with spatiotemporally shaped femtosecond laser pulses

TL;DR

This paper demonstrates that spatiotemporally shaped femtosecond laser pulses can achieve aberration-free 3D micromachining in glass, maintaining high resolution across various depths without correction.

Contribution

It introduces a novel method of shaping femtosecond laser pulses in space and time to suppress aberrations during deep glass micromachining.

Findings

Achieves consistent spatial resolution from 0.25 mm to 9 mm depth

Suppresses optical aberration without correction

Enables precise 3D microprocessing in glass

Abstract

We observe that focusing a femtosecond laser beam simultaneously chirped in time and space domains in glass can efficiently suppress the optical aberration caused by the refractive index mismatch at the interface of air and the glass sample. We then demonstrate three dimensional microprocessing in glass with a nearly invariant spatial resolution for a large range of penetration depth between 0.25 mm and 9 mm without any aberration correction.