title: Controllable Terahertz Radiation from a Linear-Dipole Array Formed by a Two-Color Laser Filament in Air.
abstract: We demonstrate effective control on the carrier-envelope phase and angular distribution as well as the peak intensity of a nearly single-cycle terahertz pulse emitted from a laser filament formed by two-color, the fundamental and the corresponding second harmonics, femtosecond laser pulses propagating in air. Experimentally, such control has been performed by varying the filament length and the initial phase difference between the two-color laser components. A linear-dipole-array model, including the descriptions of both the generation (via laser field ionization) and propagation of the emitted terahertz pulse, is proposed to present a quantitative interpretation of the observations. Our results contribute to the understanding of terahertz generation in a femtosecond laser filament and suggest a practical way to control the electric field of a terahertz pulse for potential applications.
authors.affiliation: Key Laboratory for Laser Plasmas (Ministry of Education),Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China.|Collaborative Innovation Center of IFSA, Shanghai Jiao Tong University, Shanghai 200240, China.
authors.forename: Zhelin
authors.initials: Z
authors.lastname: Zhang
authors.affiliation: Key Laboratory for Laser Plasmas (Ministry of Education),Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China.|Collaborative Innovation Center of IFSA, Shanghai Jiao Tong University, Shanghai 200240, China.
authors.forename: Yanping
authors.initials: Y
authors.lastname: Chen
authors.affiliation: Key Laboratory for Laser Plasmas (Ministry of Education),Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China.|Collaborative Innovation Center of IFSA, Shanghai Jiao Tong University, Shanghai 200240, China.
authors.forename: Min
authors.initials: M
authors.lastname: Chen
authors.affiliation: Key Laboratory for Laser Plasmas (Ministry of Education),Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China.|Collaborative Innovation Center of IFSA, Shanghai Jiao Tong University, Shanghai 200240, China.
authors.forename: Zhen
authors.initials: Z
authors.lastname: Zhang
authors.affiliation: Key Laboratory for Laser Plasmas (Ministry of Education),Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China.
authors.forename: Jin
authors.initials: J
authors.lastname: Yu
authors.affiliation: Key Laboratory for Laser Plasmas (Ministry of Education),Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China.|Collaborative Innovation Center of IFSA, Shanghai Jiao Tong University, Shanghai 200240, China.|Department of Physics, SUPA, University of Strathclyde, Glasgow G4 0NG, United Kingdom.
authors.forename: Zhengming
authors.initials: Z
authors.lastname: Sheng
authors.affiliation: Key Laboratory for Laser Plasmas (Ministry of Education),Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China.|Collaborative Innovation Center of IFSA, Shanghai Jiao Tong University, Shanghai 200240, China.
authors.forename: Jie
authors.initials: J
authors.lastname: Zhang