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Extending optical filaments with phase-nested laser beams

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Abstract

Extending the length of femtosecond laser filamentation has always been desired for practical applications. Here, we demonstrate that significant extending of a single filament in BK7 glass can be achieved by constructing phase-nested beams. The filamentation and the following energy replenishment are assembled in a single phase-nested beam. The central part of the phase-nested beam is an apertured Gaussian beam, which is focused into one focal spot to produce a short filament. In contrast, the rest of the annular part converges gradually towards the central axis to continuously replenish the energy for supporting the regeneration of filaments. The common-path generating system ensures the stability of generated filaments and easily optimizes the beam parameters to obtain the longest high-quality filament due to its flexibility. In addition, we discuss the significance of continuous replenishment for extending filaments and the potential for generating more extended filaments based on this method.

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DOI:10.1364/prj.6.001130

基金项目:National Key R&D Program of China (2017YFA0303700, 2017YFA0303800); National Natural Science Foundation of China (NSFC)10.13039/501100001809 (11534006, 11674184, 11774183); Natural Science Foundation of Tianjin City10.13039/501100006606 (16JCZDJC31300); 111 Project (B07013); Collaborative Innovation Center of Extreme Optics.

收稿日期:2018-07-18

录用日期:2018-10-16

网络出版日期:2018-10-17

作者单位    点击查看

Jia-Qi Lü:School of Physics and Key Laboratory of Weak-Light Nonlinear Photonics, Nankai University, Tianjin 300071, China
Ping-Ping Li:School of Physics and Key Laboratory of Weak-Light Nonlinear Photonics, Nankai University, Tianjin 300071, China
Dan Wang:School of Physics and Key Laboratory of Weak-Light Nonlinear Photonics, Nankai University, Tianjin 300071, China
Chenghou Tu:School of Physics and Key Laboratory of Weak-Light Nonlinear Photonics, Nankai University, Tianjin 300071, China
Yongnan Li:School of Physics and Key Laboratory of Weak-Light Nonlinear Photonics, Nankai University, Tianjin 300071, Chinae-mail: liyongnan@nankai.edu.cn
Hui-Tian Wang:National Laboratory of Solid State Microstructures and School of Physics, Nanjing University, Nanjing 210093, ChinaInnovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China

联系人作者:Hui-Tian Wang(htwang@nju.edu.cn)

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引用该论文

Jia-Qi Lü, Ping-Ping Li, Dan Wang, Chenghou Tu, Yongnan Li, and Hui-Tian Wang, "Extending optical filaments with phase-nested laser beams," Photonics Research 6(12), 1130-1136 (2018)

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