Abstract
We propose and demonstrate theoretically an effective way to generate polarization-controllable terahertz (THz) emission from the gaseous plasma. Compared to the previously used ω + 2ω two-color field, we show that the wavelength for the second pump laser pulse in the combination field, which is composed of a circularly polarized laser field and a linear laser pulse, is a key factor for controlling the polarization of emitted THz waves. By choosing an appropriate laser wavelength, intense linearly, elliptically, and circularly polarized THz radiation can be generated in a wide bandwidth range. Our simulations also show that for such an incommensurate two-color femtosecond laser field, its intensity ratio and phase delay between two components can also be used to control the polarization degree and direction of THz radiation. By utilizing the present laser technologies, our scheme can be implemented in the experiment.
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