摘要:
An optical wavelength converter device has a waveguide of a nonlinear optical material disposed in cladding and having a refractive index lower than the refractive index of the cladding for converting a fundamental guided through the waveguide into a second or third harmonic and radiating the second or third harmonic into the cladding. The nonlinear optical material comprises an organic nonlinear optical material having a maximum light absorption coefficient at a wavelength close to the wavelength of at least one of the fundamental and the second harmonic.
摘要:
A nonlinear optical material comprising a compound represented by the following general formula (I): ##STR1## wherein R and R' are each an alkyl group, an aryl group, an aralkyl group or a hetero ring, and a method of converting the wavelength of laser light using the organic nonlinear optical material.
摘要:
An optical wavelength conversion device is composed of an organic nonlinear optical material, and a cladding layer having a refractive index lower than the refractive index of the organic nonlinear optical material and covering the organic nonlinear optical material, thereby to convert a fundamental wave entering the optical wavelength conversion device to a second harmonic, and to radiate the second harmonic. At least one of device edge faces including edge faces of the organic nonlinear optical material is provided with a shielding layer for shielding the device edge face from ambient atmosphere, thereby to prevent the organic nonlinear optical material from sublimation and deterioration.
摘要:
Disclosed is a non-linear optical material represented by the following formula: ##STR1## wherein X represents a methyl group or a hydrogen atom, with the proviso that when X is a methyl group, A represents a nitrogen atom, Y represents a methyl group and B represents a nitrogen atom; and when X is a hydrogen atom , A represents C--COOC.sub.2 H.sub.5, Y represents a hydrogen atom and B represents C--CH.sub.3.In one embodiment, the non-linear optical material is represented by the following formula (I): ##STR2## In another embodiment, the non-linear optical material is represented by the following formula (II): ##STR3## Also disclosed is an orthorhomic molecular crystal having a space group of Pna2.sub.1 and constituted by molecules represented by the above formula (I).
摘要:
Provided is a low-cost polyimide, containing cyclohexane diamine as a diamine unit, that has a low thermal expansion coefficient. Said block polyimide contains blocks having the repeating structural unit shown in formula (1A) and blocks having the repeating structural unit shown in formula (1B). This block polyimide is preferably obtained by imidizing a block polyamide acid imide that contains blocks having the repeating structural unit shown in formula (2A) and blocks having the repeating structural unit shown in formula (2B).
摘要:
Provided is a low-cost polyimide, containing cyclohexane diamine as a diamine unit, that has a low thermal expansion coefficient. Said block polyimide contains blocks having the repeating structural unit shown in formula (1A) and blocks having the repeating structural unit shown in formula (1B). This block polyimide is preferably obtained by imidizing a block polyamide acid imide that contains blocks having the repeating structural unit shown in formula (2A) and blocks having the repeating structural unit shown in formula (2B).
摘要:
A plurality of clipping portions which clip a plurality of lamps to be juxtaposed are provided on one face, and a mounting portion to be mounted on a supporting member by which the lamps are supported, and holding projecting portions for holding positions of the clipping portions with respect to the supporting member are provided, and two flexible portions which can bend in a direction in which a distance between the supporting sections is changed are provided between at least two clipping portions.
摘要:
The title of a program with a recording duration longest among all recording durations is recorded as the program title of a relevant program file. Thereby, even when a user has performed an operation to record a program on a hard disk recorder by a method other than a timer recording, the program title of a program that is most likely to be a program a user really desires to record can be recorded as the program title of a program file created by the recording. Accordingly, a DTV or a STB can display on its display appropriate program titles in a program file list at the time of playback of a previously recorded program.
摘要:
A novel nonlinear optical material is disclosed. The nonlinear optical material comprises a nonlinear optically-responsive layer formed by exposing a layer of a composition to light under an external electric field or an external magnetic field. The composition comprises a liquid crystalline/nonlinear optically-responsive compound having a polymerizable group and a nonlinear optically-responsive group, and a compound having at least one photoresponsive isomerization group, or comprises a polymer having a nonlinear optically-responsive group and a photoresponsive isomerization group.
摘要:
The title of a program with a recording duration longest among all recording durations is recorded as the program title of a relevant program file. Thereby, even when a user has performed an operation to record a program on a hard disk recorder by a method other than a timer recording, the program title of a program that is most likely to be a program a user really desires to record can be recorded as the program title of a program file created by the recording. Accordingly, a DTV or a STB can display on its display appropriate program titles in a program file list at the time of playback of a previously recorded program.