采用助溶剂法生长了掺杂量分别为0.1wt%和0.01wt%的0.67PMNT-0.33PT单晶.利用二波耦合实验研究了掺铁的弛豫铁电单晶0.67Pb(Mg1/3Nb2/3)O3-0.33PbTiO3(PMN-PT)的光折变性能.本文测了样品的消光光谱、电光系数、光诱吸电场和光电.最大的...采用助溶剂法生长了掺杂量分别为0.1wt%和0.01wt%的0.67PMNT-0.33PT单晶.利用二波耦合实验研究了掺铁的弛豫铁电单晶0.67Pb(Mg1/3Nb2/3)O3-0.33PbTiO3(PMN-PT)的光折变性能.本文测了样品的消光光谱、电光系数、光诱吸电场和光电.最大的增益系数达了21 cm 1,是无掺杂的PMN-PT晶体的两倍.光栅形成速率随铁浓度的升高而降低.展开更多
The effect of temperature on photorefractive process is a significant problem inphotorefractive nonlinear optics. The temperature dependence of photoretiactive effect in semiinsulating semiconductive material Cr: GaAs...The effect of temperature on photorefractive process is a significant problem inphotorefractive nonlinear optics. The temperature dependence of photoretiactive effect in semiinsulating semiconductive material Cr: GaAs was investigated by CHENG Li-jen et al., and they thought that the band gap of conventional oxide photorefractive crystal was too wide, so it is difficult to observe the temperature dependence of photorefractive effect in a general experimental condition. But the point of view has been proved not true by our experiment展开更多
The photorefractive （PR） performance of an organic/inorganic hybrid polymer composite sensitized by CdS nanoparticles, combining poly（N-vinylcarbazole） （PVK）, the second-order optically nonlinear chromophore 1-n...The photorefractive （PR） performance of an organic/inorganic hybrid polymer composite sensitized by CdS nanoparticles, combining poly（N-vinylcarbazole） （PVK）, the second-order optically nonlinear chromophore 1-n-butoxy-2-methyl-（4-p-nitropheylazo）benzene （BMNPAB） and 9-ethylcarbazole （ECZ） was studied. It was confirmed that the CdS colloidal particles had a nanoscale size and quantum confinement effect adopting transmission electron microscopy and UV-Vis absorption spectroscopy. The addition of CdS nanoparticles as a photosensitizer in PVK will be significant enhancement of photoconductivity because of the high photocharge generation quantum efficiency and high charge transport to conducting polymer. The polymer composite film exhibited PR effect with a method of two-beam coupling experiment. And an asymmetric two. beam coupling gain of 45.8 cm^-1 without applied electric filed is obtained at 632.8 nm wavelength.展开更多
Photorefractive crystals present varied features charming presence, such as high resolution, and normal handling. Depending on the portability of erasing images, photorefractive crystals are convenient for read-write ...Photorefractive crystals present varied features charming presence, such as high resolution, and normal handling. Depending on the portability of erasing images, photorefractive crystals are convenient for read-write implementations and hence find potential use in speckle photography, speckle interferometry, image processing and holography. A two-beam coupling arrangement using a LiNbO3 crystal as a recording medium for real-time rotation measurement using the coherent and low-power laser source is presented in this paper. A speckle photography technique is advanced for the measurement of a small rotation of a transmitted glass slide sample. New theoretical analysis is formulated for a general case of a slide rotation. Experimental studies are carried out to verify the outcome of the theoretical predictions and accuracy of measurement. Uncertainty of rotation measurement is studied and quantified. The proposed technique is a simple, attractive and alternative method for fringe analysis. The method promises a high degree of accuracy and increased range for rotation measurement in real-time.展开更多
Research on photorefractive effect grew unceasingly in the past two decades. A special application of the effect, light amplification, has drawn much attention recently. In order to improve the gain coefficient of pho...Research on photorefractive effect grew unceasingly in the past two decades. A special application of the effect, light amplification, has drawn much attention recently. In order to improve the gain coefficient of photorefractive crystals, methods of adjusting dopants and their concentration or special techniques are adopted展开更多
文摘采用助溶剂法生长了掺杂量分别为0.1wt%和0.01wt%的0.67PMNT-0.33PT单晶.利用二波耦合实验研究了掺铁的弛豫铁电单晶0.67Pb(Mg1/3Nb2/3)O3-0.33PbTiO3(PMN-PT)的光折变性能.本文测了样品的消光光谱、电光系数、光诱吸电场和光电.最大的增益系数达了21 cm 1,是无掺杂的PMN-PT晶体的两倍.光栅形成速率随铁浓度的升高而降低.
文摘The effect of temperature on photorefractive process is a significant problem inphotorefractive nonlinear optics. The temperature dependence of photoretiactive effect in semiinsulating semiconductive material Cr: GaAs was investigated by CHENG Li-jen et al., and they thought that the band gap of conventional oxide photorefractive crystal was too wide, so it is difficult to observe the temperature dependence of photorefractive effect in a general experimental condition. But the point of view has been proved not true by our experiment
基金Key Project of the National Natural Science Foundation of China(No.60537050)
文摘The photorefractive （PR） performance of an organic/inorganic hybrid polymer composite sensitized by CdS nanoparticles, combining poly（N-vinylcarbazole） （PVK）, the second-order optically nonlinear chromophore 1-n-butoxy-2-methyl-（4-p-nitropheylazo）benzene （BMNPAB） and 9-ethylcarbazole （ECZ） was studied. It was confirmed that the CdS colloidal particles had a nanoscale size and quantum confinement effect adopting transmission electron microscopy and UV-Vis absorption spectroscopy. The addition of CdS nanoparticles as a photosensitizer in PVK will be significant enhancement of photoconductivity because of the high photocharge generation quantum efficiency and high charge transport to conducting polymer. The polymer composite film exhibited PR effect with a method of two-beam coupling experiment. And an asymmetric two. beam coupling gain of 45.8 cm^-1 without applied electric filed is obtained at 632.8 nm wavelength.
文摘Photorefractive crystals present varied features charming presence, such as high resolution, and normal handling. Depending on the portability of erasing images, photorefractive crystals are convenient for read-write implementations and hence find potential use in speckle photography, speckle interferometry, image processing and holography. A two-beam coupling arrangement using a LiNbO3 crystal as a recording medium for real-time rotation measurement using the coherent and low-power laser source is presented in this paper. A speckle photography technique is advanced for the measurement of a small rotation of a transmitted glass slide sample. New theoretical analysis is formulated for a general case of a slide rotation. Experimental studies are carried out to verify the outcome of the theoretical predictions and accuracy of measurement. Uncertainty of rotation measurement is studied and quantified. The proposed technique is a simple, attractive and alternative method for fringe analysis. The method promises a high degree of accuracy and increased range for rotation measurement in real-time.
文摘Research on photorefractive effect grew unceasingly in the past two decades. A special application of the effect, light amplification, has drawn much attention recently. In order to improve the gain coefficient of photorefractive crystals, methods of adjusting dopants and their concentration or special techniques are adopted
