Zhengming Sheng

The manipulation of the filaments formed by two dual-color laser pulses in air in parallel arrangement is investigated experimentally. When the two pulses interfere with each other, a spatially periodic distribution of the light intensity is produced, thereby altering the refractive index of the air through the nonlinear Kerr effect and forming a series of diffraction gratings across the entire optical path.

Terahertz (THz) radiation from air plasma in the presence of pre-plasma in a collinear geometry is investigated experimentally, where the pre-plasma is formed by a pre-pulse with a Gaussian beam profile and the measured THz radiation is driven by a main laser pulse. The pre-plasma has a de-focusing effect for the main pulse passing through it, which reduces the effective length of the plasma filament formed by the main laser pulse for THz radiation.

Huanyu Song1,2, Zhengming Sheng1,2,3,*, Hanzhi Zhao1,2, Xiangyan An1,2, Suming Weng1,2, Min Chen1,2, Tongpu Yu4, and Jie Zhang1,2,3,5 1Key Laboratory for Laser Plasmas (MOE), School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China 2Collaborative Innovation Center of IFSA (CICIFSA), Shanghai Jiao Tong University, Shanghai 200240, China 3Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai 201210, China 4Department of Physics, National University of...