Nippon Oil Fats Co., Ltd.

Yoshitaka Goto

Masaharu Nakayama

Seizo Miyata

Toshiyuki Watanabe

Tsuguo Yamaoka

Kenichi Koseki

Akio Hayashi

Zhang G Jian

A non-linear optical material consists essentially of 3-(2-thienyl)-1-(4-methylphenyl)propene-3-one represented by the formula (I) ##STR1## A non-linear optical device contains an organic compound disposed in a light beam. The organic compound is represented by the formula (I) and has a crystal in which a space group determined by the X-ray analytical method is P2.sub.1.

Non-linear optical material and non-linear optical device

A non-linear optical device is provided in which an organic compound is disposed in a light beam. The organic compound is a benzalacetofuran derivative represented by the following formula (I) ##STR1## wherein R is CH.sub.3, CH.sub.3 S, Br, CN or NO.sub.2.

Non-linear optical device

Non-linear optical material

A non-linear optical article is constituted of a derivative of benzalacetophenone represented by the following general formula: ##STR1## wherein A and B each represent the same or different atom or group and stand for a hydrogen atom, an alkoxy group having 1 to 4 carbon atoms, a chlorine atom, a bromine atom, an amino group or a dialkylamino group having 1 to 2 carbon atoms.

Non-linear optical article

A photo polymerization initiator composition is disclosed. The composition is comprised of an organic peroxide and a salt selected from the group consisting of pyrylium salts, thiapyrylium salts and selenopyrylium salts represented by the general formula (I): ##STR1## the substituents are defined within the specification. By utilizing the disclosed photo polymerization initiator composition, it is possible to obtain high sensitivity even in the visible range of light.

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Tsukuba, Japan

Yoshitaka Goto