The terahertz (THz) generation in a dual-color field was investigated experimentally by precisely controlling the relative time delayτ and polarizationθ of dual-color lasers, where the accompanying third-harmonic generation (THG) is employed to determineτ up to the sub-wavelength accuracy. An anticorrelation of the yields between THz and THG withτ was displayed. Compared with the theoretical simulations, the experimental results reveal that the continuum-continuum transitions of the released electron after single-atom ionization are the dominating mechanism for THz generation, which is opposite to the high-harmonic generation (HHG) based on the recollision mechanism, or the radiation induced by perturbative bound-bound transitions.
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Thursday, June 7, 2018
Abstract-Terahertz generation in dual-color laser: continuum electron in strong-field single-atom ionization
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