We examine the generation of terahertz by optical rectification of fundamental infrared beam with its second harmonic in ionized air. From polarization measurements we identify an important, yet so far unreported cross term ?<sup>(3)</sup> <sup>xyxy</sup>.
© 2008 Optical Society of America
A. Houard, Y. Liu, B. Prade, and A. Mysyrowicz, "Polarization Analysis of THz Generated by Four Wave Mixing in Air," in Conference on Lasers and Electro-Optics/Quantum Electronics and Laser Science Conference and Photonic Applications Systems Technologies, OSA Technical Digest (CD) (Optical Society of America, 2008), paper CFV1.
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