Influence of off-axis phase singularity on the filamentation of femtosecond vortex beams

被引：1
作者：
Tao, Pengchao [1 ,2 ]
Li, Dongwei [1 ,2 ,3 ,4 ]
Yu, Junhui [1 ,2 ]
Liang, Wei [1 ,2 ]
Zhang, Lanzhi [1 ,2 ,3 ,4 ]
Cai, Yangjian [1 ,2 ,3 ,4 ]
Hao, Zuoqiang [1 ,2 ,3 ,4 ]
机构：
[1] Shandong Normal Univ, Shandong Prov Engn & Tech Ctr Light Manipulat, Jinan 250358, Peoples R China
[2] Shandong Normal Univ, Sch Phys & Elect, Shandong Prov Key Lab Opt & Photon Devices, Jinan 250358, Peoples R China
[3] Shandong Normal Univ, Collaborat Innovat Ctr Light Manipulat & Applicat, Jinan 250358, Peoples R China
[4] East China Normal Univ, Joint Res Ctr Light Manipulat Sci & Photon Integra, Shanghai 200241, Peoples R China
来源：
OPTICS AND LASER TECHNOLOGY | 2025年 / 183卷
基金：
中国国家自然科学基金;
关键词：
Femtosecond filamentation; Vortex beam; Off-axis; Phase singularity; SPIRAL PHASE; LASER-PULSE; GENERATION;
D O I：
10.1016/j.optlastec.2024.112362
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
The phase singularity of a vortex beam is typically located at its geometric center. However, in many practical situations, this singularity may become displaced, which can significantly impact the research and applications of vortex beams. In this study, we investigate the influence of off-axis phase singularity on the filamentation of femtosecond vortex beams and the resulting supercontinuum radiation in fused silica. Our results show that displacement of the singularity leads to longitudinal splitting of filamentation, continuous shifts in the onset position, and changes in the spectral broadening and intensity of supercontinuum radiation. These findings not only provide a method for controlling filamentation but also establish a way to accurately determine whether the phase singularity of femtosecond vortex beams is precisely centered.
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页数：6
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