Abstract
The degenerate four-wave mixing experiments have been performed in the dichloromethane solutions of 2,2,6,6-tetramethyl-pipridine-4-ol-N-oxyl p-hydroxybenzaldehyde oxime benzoic ester (TPOHBOBE) and bis-(TPOHBOBE) cobalt (II), respectively. The result is in agreement with the theoretical prediction of γ depending on the molecular chain length l as l 5. A large off-resonant third order hyperpolarizability γxxxx of 1.3 × 10−30 esu for bis-(TPOHBOBE) cobalt (II) was obtained. The corresponding value of the third order nonlinear optical susceptibility χ(3) xxxx for its solid state is estimated to be 7.8 × 10−9 esu.
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