Polarization modulation time-domain terahertz polarimetry

Details Polarization modulation time-domain terahertz polarimetry Polarization modulation time-domain terahertz polarimetry

2012-03-22

arxiv.org/abs/1203.5019v1

Physics

Optics

15 pages, 3 figures, submitted to Optics Express

Scientific paper

We present high precision measurements of polarization rotations in the frequency range from 0.1 to 2.5 THz using a polarization modulation technique. A motorized stage rotates a polarizer at ~80 Hz, and the resulting modulation of the polarization is measured by a lock-in technique. We achieve an accuracy of 0.05{\deg} (900 {\mu}rad) and a precision of 0.02{\deg} (350 {\mu}rad) for small rotation angles. A detailed mathematical description of the technique is presented, showing its ability to fully characterize elliptical polarizations from 0.1 to 2.5 THz.

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