TM-pass polarizer based on multilayer graphene polymer waveguide

A TM-pass polarizer based on multilayer graphene polymer waveguide is proposed and theoretically analyzed.The mode properties,the extinction ratio,the insertion loss and the bandwidth are also discussed.The results show that a TM-pass polarizer,which only guides the TM mode,can be achieved by multilayer graphene polymer waveguide.With length of 150μm,the proposed polarizer can achieve extinction ratio of 33 dB and insertion loss of 0.5 d B at optical wavelength of 1.55μm.This device has an excellent performance,including large extinction ratio and low insertion loss within the spectral range from 1.45μm to 1.6μm.

催化裂化装置主分馏塔的改造

中国石油化工股份有限公司洛阳分公司两套重油催化裂化装置为满足产品质量升级要求，将原主分馏塔的部分双溢流塔板改为四溢流塔板，固舌塔板更换为苏尔寿的高性能的MVG固定阀塔板，塔底“人字”型塔板更换为规整格栅填料。改造结果表明，生产运行稳定，装置处理能力提高，操作弹性大、塔板效率高，产品质量容易控制；主分馏塔压力降小，气压机入口压力大幅度提高，节能效果显著。两套装置产生的经济效益分别达106×10^4，126×10^4RMB￥／a。

掺Tm光纤MOPA准相位匹配单程倍频的单频激光器

为获得0.9μm近红外波段连续波单频激光输出,用50 mm长的PPLN晶体对掺Tm光纤激光MOPA的连续波1925.08 nm单频激光输出进行单程倍频,通过聚焦参数和准相位匹配温度优化,在43.4 W基频光功率实现了最高9.07 W的962.5 nm二次谐波输出,转换效率达到20.9%。二次谐波为单纵模运转,水平和竖直方向光束质量因子分别为1.36和1.52。实验中研究了聚焦因子和相位匹配温度对倍频转换效率的影响,并讨论了聚焦条件和准相位匹配温度带宽之间的相互关系。实验结果表明:Tm光纤激光准相位匹配单程倍频是获得0.9μm波段连续波单频激光输出的有效方法。