Version 2 2023-03-01, 17:00Version 2 2023-03-01, 17:00
Version 1 2023-01-10, 03:27Version 1 2023-01-10, 03:27
preprint
posted on 2023-03-01, 17:00authored byXiaoyue Zhou, Yuchen Lin, Yi Chan, Fu Deng, Jingdi Zhang
We report on the proof-of-principle experiment of generating carrier-envelope phase (CEP)-controllable and frequency-tunable narrowband terahertz (THz) radiation from air-plasma filament prescribed by the beat of temporally stretched two-color laser pulse sequence. The pulse sequence was prepared by propagating the fundamental ultrafast laser pulse through a grating stretcher and Michelson interferometer with variable inter-arm delay. By partially frequency-doubling and focusing the pulse sequence, an air-plasma filament riding a beat note was created to radiate THz wave with primary pulse characteristics (center frequency and CEP) under coherent control. To reproduce experimental results and elucidate complex nonlinear light-matter interaction, numerical simulation has been performed. This work demonstrates the feasibility of generating coherently controlled narrowband THz wave with high tunability in laser-induced air plasma.
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