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Mixed polarization states of single-cycle THz pulses. (a) Optical and THz electric fields in ZnTe (110) plane. (b) Time-dependent wave forms of two linearly polarized THz pulses: the measured angle between the two THz fields is . (c) THz -field vectors and corresponding polarization trajectories of the superposed THz fields.
Elliptically polarized narrow-band multicycle THz pulses. Two linearly and perpendicularly polarized optical pulses generate THz pulses (dotted line) and (solid line) in a PPLN crystal. The time delay between the optical pulses corresponds to 106° of the phase difference (, ) between the THz pulses. The angle between the polarizations of the THz pulses is 6°.
THz wave plate consisting of WG polarizer and mirror controls THz ellipticity of narrow-band multicycle THz pulses. (a) Two linearly and perpendicularly polarized THz pulses (dotted line: reflection from the WG polarizer) and (solid line: reflection from the mirror) are shown. The phase difference between the THz pulses at is . (b) 3D plots of THz E-field vectors for and 85°. (c) Polarization trajectories in the plane for , 58°, 85°, and 153°.
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