Optical bistability was observed and studied in the output of reflected beam as well as in that of m-lines in a doped polymer thin film quasi-waveguide.The physical origin was demonstrated to be the existence of a mod...Optical bistability was observed and studied in the output of reflected beam as well as in that of m-lines in a doped polymer thin film quasi-waveguide.The physical origin was demonstrated to be the existence of a mode spectrum and the high third order nonlinearity of the polymer film.It was also observed for the first time that the intensity variation of the reflected beam and the m-line in the hysteresis loops are complementary to each other.展开更多
Optical bistability hysteresis loop has been observed experimentally with a setup using prism excitation of surface wave in a doped polymer thin film.A simple model has been developed to analyze its operation.The obse...Optical bistability hysteresis loop has been observed experimentally with a setup using prism excitation of surface wave in a doped polymer thin film.A simple model has been developed to analyze its operation.The observed bistability hysteresis loop can be explained in terms of surface plasmon excitation and laser induced refractive index variations.展开更多
The photorefractive properties of Cu doped KTa_(1-x)Nb_(x)O_(3) have been st tidied by using two-wave mixing method.The diffraction efficiency reaches as high as 52%under an electric Held.The dependences of diffractio...The photorefractive properties of Cu doped KTa_(1-x)Nb_(x)O_(3) have been st tidied by using two-wave mixing method.The diffraction efficiency reaches as high as 52%under an electric Held.The dependences of diffraction efficiency on interference angles and applied fields Aave been studied.The maximum light induced index chajige is found to be 2.33×10^(-5) and the photorefraction sensitivity calculated is 5×10^(-6)cm^(2)/J.Experimental results demonstrate that electrons are the dominant charge carriers.展开更多
Optical bistability hysteresis loop has been observed experiment ally with a setup using prism excitation of surface wave in a doped polymer thin film.A simple model has been developed to analyze its operation.The obs...Optical bistability hysteresis loop has been observed experiment ally with a setup using prism excitation of surface wave in a doped polymer thin film.A simple model has been developed to analyze its operation.The observed bistability hysteresis loop can be explained in terms of surface plasmon excitation and laser induced refractive index variations.展开更多
We report a new system of organic materials for photon-gated persistent spectral hole burning by donor-acceptor electron transfer:a tetrabenzoporphyrin derivative as donor and one of several aromatic cyanides as an ac...We report a new system of organic materials for photon-gated persistent spectral hole burning by donor-acceptor electron transfer:a tetrabenzoporphyrin derivative as donor and one of several aromatic cyanides as an acceptor in a poly(methyl methacrylate)(FMMA)host matrix.Up to 50C%deep spectral holes in transmission were burnt and appeared very high hole burning efficiency.展开更多
The first observation of collisional narrowing by time-resolved degenerate four-wave mixing has been reported. The velocity-changing collision cross section of Na in Ar De obtained is 5.6 × 10^(-15)cm^(2).
Diffraction from the second-order photorefractive grating written in KTa_(1-x)Nb_(x)O_(3)(x=0.32)crystal with cubic phase has been observed for the first time.The behaviors of this diffraction have been investigated e...Diffraction from the second-order photorefractive grating written in KTa_(1-x)Nb_(x)O_(3)(x=0.32)crystal with cubic phase has been observed for the first time.The behaviors of this diffraction have been investigated experimentally.Some qualitative explanations have been proposed.展开更多
基金Supported by the National Natural Science Foundation of Chinathe National 863 high-tech.Bond of China.
文摘Optical bistability was observed and studied in the output of reflected beam as well as in that of m-lines in a doped polymer thin film quasi-waveguide.The physical origin was demonstrated to be the existence of a mode spectrum and the high third order nonlinearity of the polymer film.It was also observed for the first time that the intensity variation of the reflected beam and the m-line in the hysteresis loops are complementary to each other.
基金Supported by the National Natural Science Foundation of China。
文摘Optical bistability hysteresis loop has been observed experimentally with a setup using prism excitation of surface wave in a doped polymer thin film.A simple model has been developed to analyze its operation.The observed bistability hysteresis loop can be explained in terms of surface plasmon excitation and laser induced refractive index variations.
文摘The photorefractive properties of Cu doped KTa_(1-x)Nb_(x)O_(3) have been st tidied by using two-wave mixing method.The diffraction efficiency reaches as high as 52%under an electric Held.The dependences of diffraction efficiency on interference angles and applied fields Aave been studied.The maximum light induced index chajige is found to be 2.33×10^(-5) and the photorefraction sensitivity calculated is 5×10^(-6)cm^(2)/J.Experimental results demonstrate that electrons are the dominant charge carriers.
基金Supported by the National Natural Science Foundation of China。
文摘Optical bistability hysteresis loop has been observed experiment ally with a setup using prism excitation of surface wave in a doped polymer thin film.A simple model has been developed to analyze its operation.The observed bistability hysteresis loop can be explained in terms of surface plasmon excitation and laser induced refractive index variations.
基金Supported by the National Advanced Materials Committee of China(NAMCC).
文摘We report a new system of organic materials for photon-gated persistent spectral hole burning by donor-acceptor electron transfer:a tetrabenzoporphyrin derivative as donor and one of several aromatic cyanides as an acceptor in a poly(methyl methacrylate)(FMMA)host matrix.Up to 50C%deep spectral holes in transmission were burnt and appeared very high hole burning efficiency.
文摘The first observation of collisional narrowing by time-resolved degenerate four-wave mixing has been reported. The velocity-changing collision cross section of Na in Ar De obtained is 5.6 × 10^(-15)cm^(2).
基金Supported by the National Nat ural Science Foundation of China,and by the State Sciences and Technology Commission of China under Grant No.2 for key research project.
文摘Diffraction from the second-order photorefractive grating written in KTa_(1-x)Nb_(x)O_(3)(x=0.32)crystal with cubic phase has been observed for the first time.The behaviors of this diffraction have been investigated experimentally.Some qualitative explanations have been proposed.
