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Tuesday, June 23, 2015
Abstract-Tunable Circularly Polarized Terahertz Radiation from Magnetized Gas Plasma
W.-M. Wang, P. Gibbon, Z.-M. Sheng, and Y.-T. Li
Phys. Rev. Lett. 114, 253901 – Published 23 June 2015
It is shown, by simulation and theory, that circularly or elliptically polarized terahertz radiation can be generated when a static magnetic (B) field is imposed on a gas target along the propagation direction of a two-color laser driver. The radiation frequency is determined by ω2p+ω2c/4−−−−−−−−√+ωc/2, where ωp is the plasma frequency and ωc is the electron cyclotron frequency. With the increase of the B field, the radiation changes from a single-cycle broadband waveform to a continuous narrow-band emission. In high-B-field cases, the radiation strength is proportional to ω2p/ωc. The B field provides a tunability in the radiation frequency, spectrum width, and field strength.