Dual-frequency terahertz emission from splitting filaments induced by lens tilting in air

Zhang, Zhelin and Chen, Yanping and Yang, Liu and Yuan, Xiaohui and Liu, Feng and Chen, Min and Xu, Jianqiu and Sheng, Zhengming and Zhang, Jie (2014) Dual-frequency terahertz emission from splitting filaments induced by lens tilting in air. Applied Physics Letters, 105 (10). ISSN 0003-6951

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    Abstract

    Dual-frequency terahertz radiation from air-plasma filaments produced with two-color lasers in air has been demonstrated experimentally. When a focusing lens is tilted for a few degrees, it is shown that the laser filament evolves from a single one to two sub-filaments. Two independent terahertz sources emitted from the sub-filaments with different frequencies and polarizations are identified, where the frequency of terahertz waves from the trailing sub-filament is higher than that from the leading sub-filament.