I guess that if generated THz wave is weak, it does not effect on a crystal polarization wave and the Kleinman conditions are satisfied. The Kleinman conditions are not valid when the THz wave is strong and gives a main contribution to the crystal polarization wave (e.g. a case of second harmonic generation of THz wave). Could someone reply about a correctness of my guess?
Hendradi Hardhienata
As far as I know, Kleinman symmetry is violated for anomalous dispersion or on resonance effect since the nonlinear tensor is heavily frequency dependant. At resonance it will produce high nonlinear contribution. Maybe your conversion is related to resonance frequency somehow?
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