光诱导光学晶格中高斯型孤子的开关行为

讨论了高斯型空间光孤子在光折变介质光学晶格的传输行为,运用分步傅里叶变换法对传输方程进行数值分析.研究表明:单个斜入射高斯型光孤子在周期性光学晶格中会局限于入射波导传输或在合适振幅的情况下穿过若干波导再自陷于某个波导;而当同时存在正入射和斜入射孤子时,两者相遇后会发生反射或透射,并可通过斜入射光孤子的振幅选择反射或透射.     

一种间接测量全固化激光器热焦距的方法

以激光器中高斯光束的传播矩阵方程为基础 ,结合远场发散角的测定 ,设计和实现了一种间接测量激光晶体热焦距的方法 ,最高测量精度达± 10 %。该方法简便、易行 ,实用性强 ,精度高 ,特别适用于激光二极管 (LD)端面抽运激光器晶体热焦距的测量。     

Scaling limit of isoradial dimer models and the case of triangular quadri-tilings

We consider dimer models on planar graphs which are bipartite, periodic and satisfy a geometric condition called isoradiality, defined in [R. Kenyon, The Laplacian and Dirac operators on critical planar graphs, Invent. Math. 150 (2) (2002) 409–439]. We show that the scaling limit of the height function of any such dimer model is a Gaussian free field. Triangular quadri-tilings were introduced in [B. de Tilière, Quadri-tilings of the plane, math.PR/0403324, Probab. Theory Related Fields, in press]; they are dimer models on a family of isoradial graphs arising from rhombus tilings. By means of two height functions, they can be interpreted as random interfaces in dimension 2+2. We show that the scaling limit of each of the two height functions is a Gaussian free field, and that the two Gaussian free fields are independent.     

Z—scan的理论及技术研究进展

本文在介绍传统Z－scan的基础上介绍双色光Z－scan（Tow color Z－scan）、双光束时间分辨率Z－scan（Time-resolved Z－scan）、遮挡Z－scan（Eclipsing Z－scan）、反向Z－scan（Reflection Z－scan）等改进的Z扫描技术。分析了各种Z－scan技术的特点及应用。综述了Z扫描理论与技术的发展。