作者
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
发表日期
2021/9/15
期刊
Optics Letters
卷号
46
期号
18
页码范围
4678-4681
出版商
Optica Publishing Group
简介
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 k_r (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 …
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