Abstract

We examine the generation of terahertz (THz) by optical rectification of a fundamental infrared beam with its first harmonic in ionized air. From polarization measurements we identify an important, yet so far unreported (to our knowledge), cross term (χxyxy(3)+χxyyx(3)) of the nonlinear susceptibility tensor. Omission of this term leads to an error by a factor of 106 of the THz intensity obtained with certain polarization configurations.

© 2008 Optical Society of America

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