Abstract
The discovery that combinations of optical fields could exhibit polarity opens up new possibilities for optical handling of molecules [1], A standard situation in which an optical field exhibits polarity is the coherent superposition of a field Eω at a fundamental frequency ω with its harmonic E2ω at frequency 2ω. It is pictured in Figure 1. Polarity of the cubic interferences appears in the non-zero average cube <E3>t where the subscript t holds for time average.
© 1995 Optical Society of America
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