Open AccessEnhance terahertz radiation and its polarization- control with two paralleled filaments pumped by two-color femtosecond laser fields
Author(s) -
Qiying Song,
Xinming Yuan,
Shiyu Hu,
Junjie Huang,
Haizhe Zhong,
Qing Lin,
Honggeng Wang,
Xiaowei Lu,
Maijie Zheng,
Yi Cai,
Xuanke Zeng,
Shixiang Xu
Publication year - 2021
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.427896
Subject(s) - terahertz radiation , optics , femtosecond , laser , polarization (electrochemistry) , electric field , photocurrent , photomixing , materials science , radiation , terahertz spectroscopy and technology , far infrared laser , linear polarization , optoelectronics , protein filament , physics , terahertz metamaterials , chemistry , quantum mechanics , composite material
We present experimentally an obvious enhancement of the terahertz (THz) radiation with two paralleled filaments pumped by two-color laser fields for a full use of a high laser power, compared with single filament. By mapping the 3-dimensional electric trajectories of generated THz fields with a (111) ZnTe crystal, we observe that the total THz polarization from two filaments can be manipulated by varying the time delay between the two orthogonally polarized pumps, which agrees well with the simulations under the photocurrent model. Notably, the power and spectrum of the THz field almost keep unchanged while manipulating the ellipticity of the THz polarization, which is important for a polarization-controllable THz source.