Abstract
We individually control polarizations of 800 and 400 nm beams, which form a two-color femtosecond plasma filament in air irradiating a linear-to-elliptical THz signal. We detected a threshold-like appearance of THz ellipticity at the angle of ~85° between the fundamental and second-harmonic field polarization directions. The simulations confirm the abrupt change of THz polarization and reveal that the weak ellipticity of the second harmonic is sufficient to generate essentially elliptical THz radiation.
Original language | English (US) |
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Pages (from-to) | 90-93 |
Number of pages | 4 |
Journal | Optics Letters |
Volume | 43 |
Issue number | 1 |
DOIs | |
State | Published - Jan 1 2018 |
Bibliographical note
Funding Information:Funding. Russian Science Foundation (RSF) (16-42-01060); Deutsche Forschungsgemeinschaft (DFG) (BA 4156/4-1, MO 850-19/1, MO 850-20/1).
Publisher Copyright:
© 2018 Optical Society of America.