Non-linear Optical Properties of Squarate Esters and Amides†

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Michael G. Hutchings, Ian Ferguson, Simon Allen, Joseph Zyss and Isabelle Ledoux


Abstract

In agreement with theoretical prediction, a squaric acid diamide shows appreciable quadratic non-linear optical (NLO) activity in solution, and because of their transparency such amides may be attractive materials for second harmonic generation of blue light, although all crystalline derivatives measured were essentially NLO inactive.


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