Compositions – Light transmission modifying compositions
Patent
1989-03-17
1991-09-03
Maples, John S.
Compositions
Light transmission modifying compositions
252589, 252600, 359240, 359328, F21V 900, G02B 502, G03C 100, G02F 101
Patent
active
050452398
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a non-linear optical material comprising a derivative of chalcone.
Non-linear optical materials are the materials exhibiting so-called non-linear optical effects, in which non-linear responses result from induced polarization of electrons by the electric field created by the light incident to the materials, such effects being generally due to the second and higher order terms in the following equation of: E.multidot.E.multidot.E+ - - - +.kappa..sup.(n) E.multidot.n field, and .kappa..sup.(n) is non linear sensitivity of the n-th order.
It has been known that due to a phenomenon known as the second harmonic generation (SHG) obtained by the specific utilization of the secondary effect, an incident light is converted into a light wave corresponding to the second harmonic wave and having a frequency twice as high as the frequency of the incident light or the refractive index is changed by voltage, so that the phenomenon is very conveniently utilized for performing various optical processings including conversion of wave lengths, processing of signals and modulation of laser beams, which are extremely advantageous.
Although inorganic crystals, such as KH.sub.2 PO.sub.4 (KDP). LiNbO.sub.3, or NH.sub.4 H.sub.2 PO.sub.4 (ADP), have hitherto been used as the non-linear optical materials, they have disadvantages that single crystals having high optical purities are very expensive, that they are so deliquescent as to be inconvenient in handling, and that the non-linear sensitivities thereof are not so high. On the other hand, since the utility of organic materials was suggested in 1983 in the symposium in the American Chemical Society, organic crystals of urea, aniline base compounds or the like were reported to be utilizable as non-linear optical materials. However, these organic compounds do not exhibit satisfactory non-linear optical effect, or the compounds which exhibit a relatively high level of non-linear effect have a disadvantage that they have light absorptive terminal groups that are significantly shifted to the long wavelength range to thus limit the wavelength range of the light waves which can be processed therethrough.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a non-linear optical material comprising a derivative of chalcone, which is excellent in transmittance and transparency and exhibits exceedingly high non-linear effect.
According to the present invention, there is provided a non-linear optical material comprising a derivative of chalcone represented by the following general formula (I) of: ##STR2## wherein R.sub.1 is a halogen atom, a hydroxyl group, an amino group, a dimethylamino group, a nitro group, a cyano group, a phenyl group, an acetyl group, an alkyl group having 1 to 18 carbon atoms or an alkyloxy group having 1 to 22 carbon atoms; n.sub.1 is an integer of from 0 to 21; and m.sub.1 is an integer of from 0 to 5.
Also provided by the present invention is a non-linear optical material comprising a derivative of chalcone represented by the following general formula (II) ##STR3## wherein R.sub.2 is a halogen atom, a hydroxyl group, an amino group, a dimethylamino group, a nitro group, a cyano group, a phenyl group, an acetyl group, an alkyl group having 1 to 18 carbon atoms or an alkyloxy group having 1 to 22 carbon atoms; n.sub.2 is an integer of from 0 to 21; and m.sub.2 is an integer of from 0 to 5.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a graph showing the light absorption spectrum of a purified product of 4-methylthiochalcone which is one of the non-linear optical materials of this invention and the light absorption spectrum of a known non-linear optical material; and
FIG. 2 is a graph showing the light absorption spectrum of a purified product of 3-bromo-4'-methylthiochalcone which is one of the non-linear optical materials of this invention and the light absorption spectrum of a known non-linear optical material.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The present invention wil
REFERENCES:
patent: 4892681 (1990-01-01), Miyata et al.
Goto Yoshitaka
Hayashi Akio
Miyata Seizo
Nakayama Masaharu
Watanabe Toshiyuki
Maples John S.
Nippon Oil and Fats Co. Ltd.
Tucker Philip
LandOfFree
Non-linear optical material does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Non-linear optical material, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Non-linear optical material will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1007380