Spatial and temporal characterization of a Bessel beam produced using a conical mirror

TL;DR

This paper experimentally characterizes a Bessel beam generated by a conical mirror, confirming its diffraction-free and superluminal properties through spatial and temporal measurements aligned with theory.

Contribution

It provides the first detailed experimental analysis of a conical mirror-produced Bessel beam, focusing on its superluminal and diffraction-free behavior.

Findings

Central peak remains non-spreading over 73 cm

Measured superluminal phase and group velocities

Experimental results agree with theoretical predictions

Abstract

We experimentally analyze a Bessel beam produced with a conical mirror, paying particular attention to its superluminal and diffraction-free properties. We spatially characterized the beam in the radial and on-axis dimensions, and verified that the central peak does not spread over a propagation distance of 73 cm. In addition, we measured the superluminal phase and group velocities of the beam in free space. Both spatial and temporal measurements show good agreement with the theoretical predictions.