We show that the refractive index change induced by a focused incident beam with an additional incoherent uniform illumination in photovoltaic-photorefractive crystals under open-circuit condition has a saturable nonl...We show that the refractive index change induced by a focused incident beam with an additional incoherent uniform illumination in photovoltaic-photorefractive crystals under open-circuit condition has a saturable nonlinearity form.The incoherent uniform background illumination can be used to increase the effective dark irradiance.The formation time of the photovoltaic soliton can be decreased by keeping the intensity of the soliton at a higher value without over-saturation by use of the background illumination.展开更多
In the paper we obtain two infinite classes of p-groups, calculate the orders of their automorphism groups and correct a mistake（perhaps misprinted） of Rodney James＇ paper in 1980.
Coherent backscattering of light from a water suspension of zirconium silicate microcrystals is experimentallystudied.Optically controlled weak localization of photons is realized,which is due to the reorientation beh...Coherent backscattering of light from a water suspension of zirconium silicate microcrystals is experimentallystudied.Optically controlled weak localization of photons is realized,which is due to the reorientation behaviors of positive uniaxial microcrystals induced by a linearly polarized pump beam.Because zirconium silicate particles are positive uniaxial microcrystals,their reorientation behaviors are contrary to negative ones.Our work widely extends the materials used in the light-controllable weak localization of photons.展开更多
The properties of Raman phonons are very important due to the fact that they can availably reflect some important physical information. An abnormal Raman peak is observed at about 558 cm-1 in In film composed of In/In...The properties of Raman phonons are very important due to the fact that they can availably reflect some important physical information. An abnormal Raman peak is observed at about 558 cm-1 in In film composed of In/InOx core-shell structured nanoparticles, and the phonon mode stays very stable when the temperature changes. Our results indicate that this Raman scattering is attributed to the existence of incomplete indium oxide in the oxide shell.展开更多
The steady intensity of a forward phase conjugate wave (FPCW) is successfully observed along the c-axis in the highly magnesium-doped lithium niobate crystal. We put forward a detailed physical picture for our experim...The steady intensity of a forward phase conjugate wave (FPCW) is successfully observed along the c-axis in the highly magnesium-doped lithium niobate crystal. We put forward a detailed physical picture for our experiment phenomena. The FPCW is generated from the phase-mismatch in a three-wave coupling process, and tends to be stable accompanied with the building of photorefractive gratings and four-wave coupling processes. Our experimental result is also discussed and analysed by means of the wave coupling theory, and the theoretical expression is provided for the experiment.展开更多
We demonstrated experimentally the dependence of two-beam coupling on the incident pump intensity in our samples of doped LiNbO_(3)crystals.Our results show that there is an optimum pump intensity for the signal beam ...We demonstrated experimentally the dependence of two-beam coupling on the incident pump intensity in our samples of doped LiNbO_(3)crystals.Our results show that there is an optimum pump intensity for the signal beam amplification,which can be easily controlled by doping the LiNbO_(3)crystal with suitable concentrations of Fe and damage-resistant dopants such as Mg,In,and Zn.展开更多
The dual-wavelength storage for multi-page storage with the nondestructive readout is investigated in the double doped lithium niobate crystals.The image field losses are minimized by adjusting the readout wave vector...The dual-wavelength storage for multi-page storage with the nondestructive readout is investigated in the double doped lithium niobate crystals.The image field losses are minimized by adjusting the readout wave vectors,and the resolution is improved by optimizing the storage setup.展开更多
Stationary photorefractive self-pumped phase-conjugation with one four-wave-mixing interaction region,stimulated by the photorefractive amplified backward scattering,is obtained in LiNbO3:Fe crystals,in which the stro...Stationary photorefractive self-pumped phase-conjugation with one four-wave-mixing interaction region,stimulated by the photorefractive amplified backward scattering,is obtained in LiNbO3:Fe crystals,in which the strong backward scattered light is gotten by putting a scattering particle on the backface of the sample.Even though its reflectivities are not high(its temporal and stationary reflectivities are 10%and 3%,respectively),due to the low electrooptic coefficients of LiNbO3:Fe crystals,our experimental results prove that this mechanism is effective and simple comparing with the“cat”self-pumped phase-conjugator.展开更多
For a photorefractive crystal,the exponential gain coefficient of two-wave coupling,Г,is a constant.In this paper,the constantГof a LiNbO_(3):Fe crystal is measured by using Gaussian beams and quasi-uniform beams.Th...For a photorefractive crystal,the exponential gain coefficient of two-wave coupling,Г,is a constant.In this paper,the constantГof a LiNbO_(3):Fe crystal is measured by using Gaussian beams and quasi-uniform beams.The difference between the results is attributed to the self-defocusing effect of the crystal.展开更多
基金Supported by the National Natural Science Foundation of China under Grant Nos.69678018 and 69878009.
文摘We show that the refractive index change induced by a focused incident beam with an additional incoherent uniform illumination in photovoltaic-photorefractive crystals under open-circuit condition has a saturable nonlinearity form.The incoherent uniform background illumination can be used to increase the effective dark irradiance.The formation time of the photovoltaic soliton can be decreased by keeping the intensity of the soliton at a higher value without over-saturation by use of the background illumination.
基金Supported by NNSF of China(60574052)Supported by NSF(05001820)Supported by PST of Guangdong(2005B33301008)
文摘In the paper we obtain two infinite classes of p-groups, calculate the orders of their automorphism groups and correct a mistake（perhaps misprinted） of Rodney James＇ paper in 1980.
基金Supported by the National Natural Science Foundation of China under Grant Nos 10874093 and 11174161the National Basic Research Program of China(under Grant Nos 2007CB307002,2010CB934101,and 2010CB933801+1 种基金the 111 Project(B07013)the Programe for NCET.
文摘Coherent backscattering of light from a water suspension of zirconium silicate microcrystals is experimentallystudied.Optically controlled weak localization of photons is realized,which is due to the reorientation behaviors of positive uniaxial microcrystals induced by a linearly polarized pump beam.Because zirconium silicate particles are positive uniaxial microcrystals,their reorientation behaviors are contrary to negative ones.Our work widely extends the materials used in the light-controllable weak localization of photons.
基金Project supported by the National Natural Science Foundation of China （Grant Nos. 11374069 and 61006078）, the National Basic Research Program of China （Grant Nos. 2010CB934102 and 2010CB934101）, and the ＂Strategic Priority Research Program＂ of the Chinese Academy of Sciences （Grant No. XDA09020300）.
文摘The properties of Raman phonons are very important due to the fact that they can availably reflect some important physical information. An abnormal Raman peak is observed at about 558 cm-1 in In film composed of In/InOx core-shell structured nanoparticles, and the phonon mode stays very stable when the temperature changes. Our results indicate that this Raman scattering is attributed to the existence of incomplete indium oxide in the oxide shell.
基金Supported by the Special Funding for the Excellent Young Researchers under Grant No.69825108the National Natural Science Foundation of China under Grant No.69678108,and the“973”Project under Grant No.G1999033004.
文摘The steady intensity of a forward phase conjugate wave (FPCW) is successfully observed along the c-axis in the highly magnesium-doped lithium niobate crystal. We put forward a detailed physical picture for our experiment phenomena. The FPCW is generated from the phase-mismatch in a three-wave coupling process, and tends to be stable accompanied with the building of photorefractive gratings and four-wave coupling processes. Our experimental result is also discussed and analysed by means of the wave coupling theory, and the theoretical expression is provided for the experiment.
基金Supported by the National Natural Science Foundation of China under Grant Nos.69825108 and 19734040the National Advanced Materials5 Committee under Grant No.863-715-001-0102,the National Education Ministry of China.
文摘We demonstrated experimentally the dependence of two-beam coupling on the incident pump intensity in our samples of doped LiNbO_(3)crystals.Our results show that there is an optimum pump intensity for the signal beam amplification,which can be easily controlled by doping the LiNbO_(3)crystal with suitable concentrations of Fe and damage-resistant dopants such as Mg,In,and Zn.
基金Supported by the National Advanced Material Committee under Grant No.863-715-001-0102and Special Funding for the Excellent Young Researchers from the National Natural Science Foundation of China under Grant 69825108+1 种基金the National Natural Science Foundation of China under Grant Nos.6978018 and 6978009the“973”Project(G1999033003).
文摘The dual-wavelength storage for multi-page storage with the nondestructive readout is investigated in the double doped lithium niobate crystals.The image field losses are minimized by adjusting the readout wave vectors,and the resolution is improved by optimizing the storage setup.
文摘Stationary photorefractive self-pumped phase-conjugation with one four-wave-mixing interaction region,stimulated by the photorefractive amplified backward scattering,is obtained in LiNbO3:Fe crystals,in which the strong backward scattered light is gotten by putting a scattering particle on the backface of the sample.Even though its reflectivities are not high(its temporal and stationary reflectivities are 10%and 3%,respectively),due to the low electrooptic coefficients of LiNbO3:Fe crystals,our experimental results prove that this mechanism is effective and simple comparing with the“cat”self-pumped phase-conjugator.
基金Supported by the National Natural Science Foundation of China under Grant Nos.69678018 and 19734004the Key Research Project in Climbing Program from the National Science and Technology Commission of Chinathe National Advanced Materials Committee of China.
文摘For a photorefractive crystal,the exponential gain coefficient of two-wave coupling,Г,is a constant.In this paper,the constantГof a LiNbO_(3):Fe crystal is measured by using Gaussian beams and quasi-uniform beams.The difference between the results is attributed to the self-defocusing effect of the crystal.
