Toray Industries, Inc.

Nippon Telegraph and Telephone Corporation

Tetsuya Gotoh

Keiichi Egawa

Tetsuya Tsunekawa

Tosiyuki Kondoh

Ken-ichi Kubodera

Seiji Fukuda

Hiroshi Mataki

Mutsuo Aoyagi

A third-order nonlinear optical element showing wide employable wave-length range of input light, high speed operation and low light intensity of input light is disclosed. The third-order nonlinear optical element of the present invention has at least two substantially optically smooth surfaces and comprise a charge-transfer complex consisting essentially of (i) at least one electron-accepting component selected from the group consisting of cyano compounds, quinones, nitro compounds, acid anhydride, halogenes, and halogenated carbons; and (ii) at least one electron-donating component selected from the group consisting of unsaturated cyclic hydrocarbon compounds, unsaturated heterocyclic compounds, chalcogen-containing compounds, quarternary unsaturated heterocyclic compounds and metals. The charge-transfer complex of nonlinear optical element of the present invention is formed of said at least one electron-accepting component and said at least one electron-donating component in the ground state and at least one of said components is an organic compound having .pi.-conjugated system.

Method of operating third-order nonlinear optical element

A third-order nonlinear optical element showing wide employable wave-length range of input light, high speed operation and low light intensity of input light is disclosed. The third-order nonlinear optical element of the present invention has at least two substantially optically smooth surfaces and comprise a charge-transfer complex consisting essentially of (i) at least one electron-accepting component selected from the group consisting of cyano compounds, quinones, nitro compounds, acid anhydride, halogenes, and halogenated carbons; and (ii) at least one electron-donating component selected from the group consisting of unsaturated cyclic hydrocarbon compounds, unsaturated heterocyclic compounds, chalcogen-containing compounds, quarternary unsaturated heterocyclic compounds and metals The charge-transfer complex of nonlinear optical element of the present invention is formed of said at least one electron-accepting component and said at least one electron-donating component in the ground state and at least one of said components is an organic compound having .pi.-conjugated system.

Third-order nonlinear optical element

Second-order nonlinear optical device

The present invention provides an organic nonlinear optical material including a benzylidene-aniline derivative having an electron-donating substituent introduced at the 4-position and an electron-accepting substituent introduced at the 4'-position, by selecting as the conjugated .pi. electronic system a benzylidene-aniline derivative having a large molelcular hyperpolarizability and yet a dipole moment as small as those of benzene derivatives, and introducing a molecular alignment-regulating substituent. The centrosymmetry in the bulk state of the material, for example, in the crystal state, is destroyed and the molecular alignment is regulated to such a bulk structure so that the optical nonlinearity possessed by the molecule is effectively utilized. The material exhibit a large optical nonlinearity never attained by conventional techniques. the intermolecular cohesive force due to the .pi. electron interaction between the molecules in the present invention is larger than that between a benzene derivative. Consequently, the material has, comparatively, a high melting point, a low subliming property, and a low water-absorbing property. In conclusion, a practically invaluable nonlinear optical material having a high durability in the bulk state and an excellent resistance to laser damage is provided.

Organic nonlinear optical material

The present invention provides an organic nonlinear optical material including a benzylidene-aniline derivative having an electron-donating substituent introduced at the 4-position and an electron-accepting substituent introduced at the 4'-position, by selecting as the conjugated .pi. electronic system a benzylidene-aniline derivative having a large molecular hyperpolarizability and yet a dipole moment as small as those of benzene derivatives, and introducing a molecular alignment-regulating substituent. The centrosymmetry in the bulk state of the material, for example, in the crystal state, is destroyed and the molecular alignment is regulated to such a bulk structure so that the optical nonlinearity possessed by the molecule is effectively utilized. The material exhibits a large optical nonlinearity never attained by conventional techniques. The intermolecular cohesive force due to the .pi. electron interaction between the molecules in the present invention is larger than that between a benzene derivative. Consequently, the material has, comparatively, a high melting point, a low subliming property, and a low water-absorbing property. In conclusion, a practically invaluable nonlinear optical material having a high durability in the bulk state and an excellent resistance to laser damage is provided.

A novel near-infrared sensitive phthalocyanine-polymer composition comprises a substituted aluminum phthalocyanine and a polymer wherein substituted aluminum phthalocyanine dimers and/or dimer aggregates which are responsible to the near-infrared sensitivity, are included. The near-infrared sensitive phthalocyanine-polymer composition has useful characteristics:

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Otsu, Japan

Tetsuya Gotoh