Investigation on bismuth-oxide photonic crystal fiber for optical parametric amplification

A hexagonal solid-core bismuth-oxide micro-structure fiber is developed to balance its dispersion and nonlinearity.This simulation and calculation results show that the bismuth-oxide photonic crystal fiber(Bi-PCF) has near zero dispersion around 1550 nm.Its dispersion slop in the communication wavelength range is also relatively flat.Moreover,both nonlinear coefficient and model field distribution are obtained.Compared with the experimental results by SiO2-PCF,it can be seen that the Bi-PCF shows excellent characteristics for the optical parametric amplification(OPA).     

6-氯哒嗪-3-羧酸甲酯的合成研究

文章介绍了目标化合物6-氯哒嗪-3-羧酸甲酯方便的、高产率的合成方法.本方法以α-酮戊二酸,水合肼作为起始原料,经环合反应、与溴素反应、酯化反应、氯代反应4步,合成了目标化合物,并经IR和1HNMR等对其结构进行了表征.该合成路线原料易得,操作简便,且反应条件温和,适合工业化生产,反应总收率为64.8%.