Comments on "Slowing of Bessel light beam group velocity"

TL;DR

This paper critiques a recent study on Bessel beam group velocity reduction, emphasizing the need to consider the full spectrum of Bessel pulse types and referencing earlier comprehensive research.

Contribution

It highlights the importance of accounting for different Bessel pulse types and revisits prior work to provide a more complete understanding of group velocity phenomena.

Findings

Previous work overlooked pulse diversity

Earlier studies offer more thorough analysis

Clarification of Bessel pulse properties

Abstract

In a recent article [R. R. Alfano and D. A. Nolan, Opt. Commun. 361 (2016) 25] the group velocity reduction below the speed of light in the case of certain Bessel beam pulses has been considered and an idea of its application for a natural optical buffer presented. However, the authors treat the problem as if only one type of Bessel pulse existed, no matter how it is generated. The deficiencies of the article stem from not being familiar with an extensive literature on Bessel pulses, in particular, with a couple of papers published much earlier in the J. Opt. Soc. Am. A, which have studied exactly the same problem more thoroughly.