Imperial Chemical Industries Limited

Simon Allen

Paul F Gordon

John O Morley

Richard A Hann

Joseph Zyss

An azo compound of the formula: ##STR1## wherein R is an non-hydrophilic aliphatic or cycloaliphatic group containing from 8 to 40 carbon atoms;

Azo compound suitable for use in non-linear optics

Optical elements having non-linear optical properties comprising a compound of the formula: ##STR1## wherein E is an electron donor

Non-linear optics

Optical elements having non-linear optical properties comprising a compound of the formula: ##STR1## wherein D is an electron donor

An optical element, such as a wave guide, having non-linear optical properties, suitable for use in optical devices in which it is desirable to alter the characteristics of the light, comprising a transparent or reflecting substrate having at least a partial superficial coating comprising alternating monolayers of a first non-linear optical (NLO) compound of the formula: ##STR1## wherein R is an non-hydrophilic aliphatic or cycloaliphatic group containing from 8 to 40 carbon atoms;

Optical element having non-linear optical properties

Optical elements comprising a non-centrosymmetric compound comprising an electron donor and an electron acceptor linked by a conjugated bridging group, in which the electron acceptor is a nitroso group, in which element the molecules of the compound are aligned so that the element has a net non-centrosymmetry, a method for their preparation, optical devices comprising such elements, and some of the compounds.

Non-linear optical device

(i) A compound of the formula: ##STR1## wherein R is H, a metal or a group containing a tetravalent N atom;

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Simon Allen