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 of the nonlinear susceptibility tensor. Omission of this term leads to an error by a factor of of the THz intensity obtained with certain polarization configurations.
© 2008 Optical Society of America
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