Extending optical filaments with phase-nested laser beams
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.
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.
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: email@example.com
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
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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)