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AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsKatsuya Wakita, Tetsuji Kawakami, Nobuo Sonoda, Hisashi Minemoto
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The invention provides a nonlinear optical material comprising a compound represented by the general formula (1): ##STR1## wherein R.sup.1 denotes an electron attractive group, R.sup.2 denotes a group selected from the group consisting of a hydrogen atom, methyl group, methoxy group and electron attractive group, R.sup.3 denotes a straight-chain alkylene group, and X denotes an oxygen or sulfur atom. The invention also relates to a method of manufacturing a nonlinear optical material comprising the steps of dissolving a compound represented by the general formula (1) in an organic solvent, and evaporating the solvent while keeping its temperature constant or lowering its temperature, thereby growing a crystal of the compound represented by the general formula (1). The nonlinear optical material of the invention possessing a molecular structure realized by linking structures having a strong electron attractive group and weak electron donative portion with straight-chain alkylene portions, and thus a nonlinear optical material having a shortened absorption edge wavelength and excellent crystallinity may be obtained. These nonlinear optical materials can be effectively utilized as the nonlinear optical material for an optical wavelength converter.
A wavelength converter which is disposed in an optical resonator of a laser apparatus comprising a semiconductor laser, solid state laser medium and optical resonator, or which is disposed in an optical resonator of a laser apparatus comprising a semiconductor laser and an optical resonator, in which the nonlinear optical material of the wavelength converter comprises a compound represented by the general formula (1) ##STR21## wherein R.sup.1 denotes an electron attractive group, R.sup.2 denotes a group selected from the group consisting of a hydrogen atom, methyl group, methoxy group and electron attractive group, R.sup.3 denotes a straight-chain alkylene group, and X denotes an oxygen or sulfur atom.
A wavelength converter of an optical waveguide type of which nonlinear optical material of the waveguide for propagating the fundamental wave comprises a compound represented by the general formula (1) ##STR22## wherein R.sup.1 denotes an electron attractive group, R.sup.2 denotes a group selected from the group consisting of a hydrogen atom, methyl group, methoxy group and electron attractive group, R.sup.3 denotes a straight-chain alkylene group, and X denotes an oxygen or sulfur atom.
A method of manufacturing a nonlinear optical material comprising the steps of dissolving a compound represented by the general formula (1) in an organic solvent, and evaporating said solvent while keeping its temperature constant or lowering its temperate, thereby growing a crystal of the compound represented by the general formula (1) ##STR23## wherein R.sup.1 denotes an electron attractive group, R.sup.2 denotes a group selected from the group consisting of a hydrogen atom, methyl group, methoxy group and electron attractive group, R.sup.3 denotes a straight-chain alkylene group, and X denotes an oxygen or sulfur atom.
Dependencies are inferred from the claim text.