@article{oai:ynu.repo.nii.ac.jp:00009413,
 author = {Kawada, Yoichi and Yoshioka, Katsumasa and Arashida, Yusuke and Katayama, Ikufumi and Takeda, Jun and Takahashi, Hironori},
 issue = {13},
 journal = {Optics Express},
 month = {Nov},
 note = {Here we demonstrate simultaneous measurements of the complex transmittance and birefringence using left- and right-handed circularly polarized terahertz (THz) pulses. We change the polarization of the THz pulses periodically by modulating the polarization of the pump pulses directed onto a ZnTe (111) crystal, and we convert linear to circular polarization using a broadband THz quarter-wave retarder. By integrating the alternating-emission system with the polarization-sensitive terahertz time-domain spectrometer, we are able to obtain the electric-field vector of the transmitted terahertz pulses for both the left- and right-handed circular polarizations. Utilizing this technique, we are able to measure simultaneously the frequency-dependent complex refractive indices (real and imaginary parts) and the orientations of the slow and fast axes of birefringent materials, a quartz disc and a barium borate crystal, in a single temporal sweep.},
 pages = {30420--30434},
 title = {Simultaneous acquisition of complex transmittance and birefringence with two counter-rotating, circularly polarized THz pulses},
 volume = {26},
 year = {2018}
}