| 飞秒涡旋光与产生的3次谐波在空气中的耦合传输 |
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| 作者姓名： | 展林弟 钟志萍 徐立桐 奚婷婷 郝作强 |
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| 作者单位： | 1. 中国科学院大学物理科学学院, 北京 101408;2. 山东师范大学物理与电子科学学院 山东省光场调控工程技术研究中心&山东省光学与光子器件技术重点实验室, 济南 250358 |
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| 基金项目： | Supported by National Natural Science Foundation of China (NSFC)(11874056,11774038,11474039), Youth Innovation Promotion Association of Chinese Academy of Sciences (2014143), and Taishan Scholar Project of Shandong Province |
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| 摘 要： | 模拟飞秒涡旋光在空气中成丝产生涡旋3次谐波的过程。研究初始基频波的扰动分布和峰值功率对双色涡旋光演化的影响。对于具有对称扰动分布的初始基频波，双色涡旋不受初始峰值功率影响，能够在成丝过程中保持环形强度分布。但是，在高峰值功率情况下，涡旋的螺旋相位分布受到多丝的影响，多丝引起的相位积累效应破坏了双色涡旋的螺旋相位分布。对于具有不对称扰动的初始基频波，当形成多细丝时，双色涡旋的空间环形分布和螺旋相位分布都会被破坏。
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| 关 键 词： | 成丝 3次谐波 飞秒涡旋光 空气 扰动 峰值功率 |
| 收稿时间： | 2020-06-15 |
| 修稿时间： | 2020-07-21 |
Co-propagation of femtosecond vortex beam and the generated third harmonic in air |
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| Authors: | ZHAN Lindi ZHONG Zhiping XU Litong XI Tingting HAO Zuoqiang |
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| Institution: | 1. School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 101408, China;2. Shandong Provincial Engineering and Technical Center of Light Manipulations & Shandong Provincial Key Laboratory of Optics and Photonic Device, School of Physics and Electronics, Shandong Normal University, Jinan 250358, China |
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| Abstract: | The third harmonic (TH) vortex generated by the filamentation of femtosecond vortex beam in air is simulated. The influences of perturbation distribution and peak power of the initial fundamental wave (FW) on the evolution of the two-color vortex are investigated. For the initial FW with symmetrical perturbation, the intensity annulus of the two-color vortex is not influenced by the initial peak power and can be kept in the filamentation regime. But the spiral phase distribution is influenced by multiple filamentation under the high peak power condition. In this case, the spiral phase distribution of the two-color vortex is destroyed due to the phase accumulation of the multiple filaments. For the initial FW with asymmetrical perturbation, both the spatial annulus and the spiral phase distribution of the two-color vortex are destroyed when multiple filaments are formed. |
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| Keywords: | filamentation third harmonic femtosecond vortex beam air perturbation peak power |
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