横向受激布里渊散射诱导破坏的数值研究

基于非线性光学的耦合波理论 ,建立了大尺寸光学元件中横向受激布里渊散射 (TSBS)的二维模型及其数值模拟方法 ,并对熔石英玻璃中的瞬态TSBS进行了理论研究 ,得到了存在TSBS情况下光学元件内光场和应力场的演变特征 ,探讨了TSBS对高功率激光系统透过性能的影响 ,以及在光学元件内诱导破坏的可能性和规律     

Network formation studied by temperature scanning Brillouin scattering and differential scanning calorimetry techniques. I. The cure of 1,4-butanediol diglycidyl ether with cis-1,2-cyclohexanedicarboxylic anhydride initiated by triethylamine

The network formation process of the triethylamine-initiated reaction of 1,4-butanediol diglycidyl ether with cis-1,2-cyclohexanedicarboxylic anhydride has been investigated by conventional differential scanning calorimetry and temperature scanning Brillouin light scattering as a new experimental method for the estimation of the reaction's conversion factor. The time-temperature evolution of the observed quantities (reaction enthalpy in the calorimetric measurements and hypersound velocity in the light scattering) reflects in both sets of experimental data, but results in different kinetic parameters obtained by the assumption of an Arrhenius behavior. These differences are ascribed to the relation of the observed properties with respect to the evolution of the reaction. The enthalpy production of the system observed in the calorimetric experiment is shown to be connected directly to the chemical reaction, whereas the change in the hypersound velocity measured by the light scattering method is sensitive to the solidification of the system. © 1995 John Wiley & Sons, Inc.     

横向受激布里渊散射诱导破坏的数值研究

基于非线性光学的耦合波理论，建立了大尺寸光学元件中横向受激布里渊散射(TSBS)的二维模型及其数值模拟方法，并对熔石英玻璃中的瞬态TSBS进行了理论研究，得到了存在TSBS情况下光学元件内光场和应力场的演变特征，探讨了TSBS对高功率激光系统透过性能的影响，以及在 光学元件内诱导破坏的可能性和规律. 关键词： 横向受激布里渊散射 光学材料 破坏机理 应力场     

Network formation studied by temperature scanning brillouin scattering and differential scanning calorimetry techniques. II.

The reaction of 1,4‐butanediol diglycidyl ether (EP) with cis‐1,2‐cyclohexanedicarboxylic anhydride (CH) and triethylamine (TEA) as an initiator was studied with temperature scanning Brillouin spectroscopy (TSBS) and differential scanning calorimetry (DSC). The evolution of the reaction process (liquid–gel–solid) was investigated as a function of the epoxy molar fraction (x_EP), for sample compositions varying from an epoxy excess to an anhydride excess. The dependence of the final conversion factors αr_DSC and αr_TSBS and the kinetic parameters E_DSC and E_TSBS on x_EP is presented. A comparison of the experimental gelation point (Pgel) behavior and the expected theoretical one, described by the Flory theory, is also reported. © 2001 John Wiley & Sons, Inc. J Polym Sci Part B: Polym Phys 39: 1326–1336, 2001