We present a detailed study of the characteristics of electro-optic sampling of ultrashort terahertz (THz) pulses including frequency-dependent phase matching, reflection, dispersive propagation, and absorption. In particular, we investigated the origin of the oscillatory tail that is often observed in electro-optic sampling traces and found that this tail results from the dispersive propagation of the THz pulse through the electro-optic crystal. For extremely broadband THz pulses, the THz pulse is additionally distorted by reflection and absorption in both the generation and the electro-optic detection crystal. The modeling of the distorted electro-optic sampling trace permits a detailed reconstruction of the initial THz pulse.
© 1998 Optical Society of America
(040.3060) Detectors : Infrared
(320.5550) Ultrafast optics : Pulses
(320.7100) Ultrafast optics : Ultrafast measurements
(320.7110) Ultrafast optics : Ultrafast nonlinear optics
(350.5500) Other areas of optics : Propagation
H. J. Bakker, G. C. Cho, H. Kurz, Q. Wu, and X.-C. Zhang, "Distortion of terahertz pulses in electro-optic sampling," J. Opt. Soc. Am. B 15, 1795-1801 (1998)