We propose a common-path spectral interferometer for single-shot terahertz (THz) electro-optics (EO) detection, where a probe pulse pair with orthogonal polarizations and a relative time delay are generated by simply using a birefringent plate. One of them, as the object, transmits through a THz EO crystal with THz phase modulation, while the other goes through the crystal without any phase imposed by target the THz field as the reference. The co-axial propagation of the pulse pair can effectively reduce the noises due to mechanical vibrations, air turbulences, and temperature fluctuations in the traditional non-common-path spectral interferometers. Our experiments show that, for a given target THz pulse field, the measured THz signals in a single-shot mode have a signal-to-noise ratio (SNR) of 41.2 with our THz common-path spectral interferometer, but 7.91 with a THz Mach–Zehnder spectral interferometer; thus, our design improves the SNR of the THz signal by about 5.2 times.
© 2017 Optical Society of AmericaFull Article | PDF Article
CorrectionsShuiqin Zheng, Xinjian Pan, Yi Cai, Qinggang Lin, Ying Li, Shixiang Xu, Jingzhen Li, and Dianyuan Fan, "Common-path spectral interferometry for single-shot terahertz electro-optics detection: publisher’s note," Opt. Lett. 43, 295-295 (2018)
14 December 2017: A typographical correction was made to the author listing. A typographical correction was made to the funding section.
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