Temperature-Dependent Sellmeier Equation for 1.0 mol% Mg-Doped Stoichiometric Lithium Tantalate

We propose new coefficients for the Sellmeier equations of 1.0mol% Mg-doped stoichiometric LiTaO3. The extraordinary refractive indices for the wavelength range 0.5-4.0μm and for temperature 30-170℃ are based on measured data derived from quasi-phase-matched （QPM） optical parametric oscillator （OPO） and second- harmonic generation （SHG） based on periodically poled Mg-doped stoichiometric LiTaO3 with a pump wavelength of 1064nm. The corrected refractive indices are in good agreement with our experimental data obtained from QPM OPO and SHG pumped at 1064 μm at different temperatures.     

金属光栅异常透射增强黑磷烯法拉第旋转的理论研究

黑磷是一种具有直接带隙的二维材料,其较宽的带隙填补了石墨烯和二维过渡金属硫化物之间的带隙空白,其特殊的褶皱状晶体结构导致了其独特的面内各向异性,使其具有了独特的力电磁响应特性.本文基于单层黑磷设计了一种金光栅/黑磷/硅的混合等离子体结构的磁光器件.通过金属光栅诱导异常透射显著增强透射率,同时通过TE模式和TM混合等离子体模式匹配耦合增强了法拉第旋转效应.在1.5 THz工作频率点,对器件参数进行优化后,施加5 T的外部磁场,法拉第旋转角度可以达到2.7426°,增益为14.434倍,同时透射率能够保持在85%以上.此外,研究了黑磷的载流子密度和外部磁场对磁光器件的调谐特性.最后,讨论了金属光栅的类等离子模式对本征波导模式和法拉第磁光效应的影响.     

Continuous generation of dissipative spatial solitons in two-dimensional Ginzburg–Landau models with elliptical shaped potentials

We report on the rich dynamics of two-dimensional fundamental solitons coupled and interacting on the top of an elliptical shaped potential in a two-dimensional Ginzburg–Landau model. Under the elliptical shaped potential, the solitons display unique and dynamic properties, such as the generation of straight-line arrays, emission of either one elliptical shaped soliton or several elliptical ring soliton arrays, and soliton decay. When changing the depth and sharpness of the external potential and fixing other parameters of the potential, various scenarios of soliton dynamics are also revealed. These results suggest some possible applications for all-optical data-processing schemes, such as the routing of light signals in optical communication devices.     

Low thermal expansion and broad band photoluminescence of Zr_(0.1)Al_(1.9)Mo_(2.9)V_(0.1)O_(12)

A new material of Zr0.1Al1.9Mo2.9V0.1O12 is synthesized by the traditional solid state synthesis method.The phase transition,coefficient of thermal expansion,and luminescence properties of Zr0.1Al1.9Mo2.9V0.1O12 are explored with Raman spectrometer,dilatometer,and x-ray diffraction(XRD)diffractometer.The results show that the Zr0.1Al1.9Mo2.9V0.1O12 possesses the strong broad-band luminescence characteristics almost in the whole visible region.The sample is crystallized in a monoclinic structure group of P21/a(No.14)crystallized at room temperature(RT).The crystal is changed from monoclinic to orthorhombic structure when the temperature increases to 463 K.The material has very low thermal expansion performance in a wide temperature range.Its excellent low thermal expansion and strong pale green light properties in a wide temperature range suggest its potential applications in light-emitting diode(LED)and other optoelectronic devices.     

不同数值孔径下调控矢量光束聚焦场的反向构建

根据电磁辐射理论和矢量光场积分理论,研究了矢量光束聚焦场特性与聚焦透镜数值孔径之间的关系。在透镜焦场区设定电偶极子阵列和磁偶极子阵列,收集其辐射场并反向聚焦,通过调控与优化偶极子阵列参数,反演不同数值孔径透镜下的聚焦光场,获得了聚焦光针场、三维衍射受限光管场随透镜数值孔径的变化规律。研究结果表明,随着数值孔径的减小,光针场的纵向分量纯度、边缘斜率以及光针长度递减,半峰全宽递增,光管场依旧保持纯方位角偏振分布,且中空区域的半峰全宽递增。研究结果对在不同数值孔径下矢量光束聚焦的应用研究具有重要意义。     

Fe：LiNbO3晶体光折变全息热固定动力学特性分析

以Fe:uNbO3晶体为例,考虑了电子载流子热激发(强烈地依靠于温度),通过对以扩散和光伏特效应为主导输运机制的带输运方程和耦合波方程进行数值求解,分析了热固定过程初始光强入射比和固定温度对光栅空间电荷场的影响,指出记录固定过程中内电场极值的出现来源于质子电场对施主光栅电场的部分补偿,质子光栅电荷场可以导致晶体中记录光束之间能量耦合方向的变化,得出了理论上的加热固定时间。     

强非局域非线性介质中拉盖尔-高斯型光孤子相互作用

利用强非局域非线性介质中傍轴光束传输的线性模型(修正的Snyder-Mitchell模型)讨论了两束共线(即光束中心和传输方向都相同)拉盖尔-高斯型光孤子的传输过程. 改变双光束的相对阶数和相对强度比,叠加光场在传输截面上的光强分布呈现出多样性,通过叠加的方法在该介质中产生了多环形光孤子. 一定条件下传输光束在传输过程中会出现旋转现象,叠加光场成为旋转光场,给出了旋转光束的旋转条件以及旋转速度. 进一步利用拉盖尔-高斯光束在传输过程中特有的螺旋相位特点分析了光场截面强度多样性产生的物理机理. 关键词： 强非局域非线性介质 拉盖尔-高斯型光孤子 共线传输 涡旋相位     

奇偶q相干态的高阶反聚束效应

本文研究了奇偶q相干态的高阶反聚束效应,结果表明,当参数q和r²在一定范围内取值时,奇偶q相干态都能呈现出高阶反聚束效应(N≥2),而且2n+1阶的反聚束效应和2n阶的反聚束效应相同。