Simulation of near-diffraction- And near-dispersion-free OAM pulses with controllable group velocity by combining multiple frequencies, each carrying a Bessel mode

Kai Pang, Kaiheng Zou, Hao Song, Zhe Zhao, Amir Minoofar, Runzhou Zhang, Haoqian Song, Huibin Zhou, Xinzhou Su, Cong Liu, Nanzhe Hu, Moshe Tur, Alan E. Willner

Research output: Contribution to journalArticlepeer-review

Abstract

Optical pulses carrying orbital angular momentum (OAM) have recently gained interest. In general, it might be beneficial to simultaneously achieve: (i) minimum diffraction, (ii) minimum dispersion, and (iii) controllable group velocity. Here, we explore via simulation the generation of near-diffraction-free and near-dispersion-free OAM pulses with arbitrary group velocities by coherently combining multiple frequencies. Each frequency carries a specific Bessel mode with the same topological charge (`) but different kr (spatial frequency) values based on space–time correlations. Moreover, we also find that (i) both positive and negative group velocities could be achieved and continuously controlled from the subluminal to superluminal values and (ii) when the ` is varied from 0 to 10, the simulated value of the group velocity remains the same. However, as the ` value increases, the pulse duration becomes longer for a given number of frequency lines.

Original languageEnglish
Pages (from-to)4678-4681
Number of pages4
JournalOptics Letters
Volume46
Issue number18
DOIs
StatePublished - 15 Sep 2021

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