Interferometric characterization of pulse front tilt of spatiotemporally focused femtosecond laser pulses for three-dimensional micromachining application

TL;DR

This paper experimentally measures the pulse front tilt of spatiotemporally focused femtosecond laser pulses in different media using interference patterns, supported by simulations, to improve understanding for 3D micromachining.

Contribution

It introduces an interferometric method to characterize pulse front tilt of femtosecond laser pulses in various materials, validated by simulations.

Findings

Pulse front tilt measured accurately in air and bulk materials.

Experimental results align with simulation predictions.

Method enhances control for 3D micromachining applications.

Abstract

We report on an experimental measurement of the pulse front tilt (PFT) of spatiotemporally focused femtosecond laser pulses in the focal plane in both air and bulk transparent materials, which is achieved by examination of the interference pattern between the spatiotemporally focused pulse and a conventional focused reference pulse as a function of time delay between the two pulses. Our simulation results agree well with the experimental observations.