Advanced Shaping of Quasi-Bessel Beams for High-Intensity Applications

TL;DR

This paper identifies the physical causes of distortions in quasi-Bessel beams and introduces a strategy to precisely control their longitudinal intensity profiles, enhancing their effectiveness in high-intensity laser applications.

Contribution

It provides a new framework combining analytical, numerical, and experimental methods to tailor quasi-Bessel beams with desired longitudinal profiles.

Findings

Controlled on-axis intensity profiles achieved

Both smooth and structured profiles reliably produced

Framework applicable to high-field laser applications

Abstract

Quasi-Bessel beams produced by axiparabolas are increasingly used in high-intensity laser applications, yet their longitudinal profiles exhibit unwanted oscillations that limit their effectiveness. Here we identify the physical origin of these distortions and develop a general strategy to control the on-axis intensity of extended focal lines. By combining analytical insight with numerical and experimental validation, we show how both smooth and sharply structured longitudinal profiles can be reliably produced. This establishes a robust framework for tailoring quasi-Bessel beams in regimes relevant to laser-plasma acceleration, advanced photon sources, and other high-field applications.