Abstract

Electro-optic sampling, hereafter reported as conventional E-O, is a widely used technique for the measurement of the electric field E_THz of a THz pulse with subpicosecond time resolution [1]. Different alternatives to this technique have been proposed but they suffer from some detection nonlinearities [2,3]. Very recently, new methods based on a technique commonly used in optically heterodyne detected optical Kerr effect spectroscopy has been introduced [4,5]. These distortion-free techniques are based on two measurements at opposite optical biases near the zero transmission point in a crossed polarizers detection geometry. Hereafter, we propose a novel and simple scheme, displayed on Fig. 1-a), based on three-waves mixing interaction which makes it possible to perform a distortion-free sampling of THz pulse within a single measurement.

© 2015 IEEE