Abstract
A novel all-optical control scheme is proposed to continuously tune the THz radiation polarization, where the driving laser is based on a three-pulse configuration with adjustable time delays or intensity ratio. With this scheme, not only is the circularly polarized THz radiation realized, the continuous tuning from circular polarization to linear polarization can also be obtained conveniently just by adjusting time delays or intensity ratio. Moreover, the left or the right chirality of THz radiation can be transformed between each other with suitable time delays.
Highlights
Broadband ultra-short terahertz (THz) pulses can be generated from laser-induced gas plasma by a two-color field (ω and 2ω) with the potential to achieve a high intensity and broad bandwidth THz field beyond the damage threshold of bulk materials [1,2,3,4,5]
As for the THz waves generated from two-color laser-induced gas plasma, the polarization state of THz emission can be optically controlled by varying the relative phase or polarization states of the driving two-color laser field [13,14,15]
The results indicate that a full control of the ellipticity of THz emission can be realized, and the polarization state can be tuned from circular to linear by adjusting the time delays
Summary
Broadband ultra-short terahertz (THz) pulses can be generated from laser-induced gas plasma by a two-color field (ω and 2ω) with the potential to achieve a high intensity and broad bandwidth THz field beyond the damage threshold of bulk materials [1,2,3,4,5]. As for the THz waves generated from two-color laser-induced gas plasma, the polarization state of THz emission can be optically controlled by varying the relative phase or polarization states of the driving two-color laser field [13,14,15]. The proof-ofprinciple experiments with a two-color pulse have been demonstrated to control the THz polarization direction when the phase difference of ω and 2ω pulse changes [13, 14] Such a polarization rotation is attributed to the manipulated electron trajectories by the two-color field. As for a two-color laser field control, the polarization state of the generated THz wave is always close to linear, i.e., its ellipticity being much smaller than one [13,14,15]. The chirality of THz emission can be controlled with suitable time delays
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