一种多用途的光电自动微调器

本文介绍一种多用途光电自动微调器,它是由单片微机控制的具有自动反馈功能的光电子器件,适用于各种利用微调方式对光路进行实时自动反馈式平衡准直和精密测量.     

新型偶氮苯侧链共聚物的超快光致双折射特性

采用抽运探测方法测量了一种新型的含 4 偶氮苯 4′ 偶氮苯酚侧链的共聚物 (DAP PGMA)的光致异构特性。实验结果表明DAP PGMA比含单偶氮苯侧链共聚物P (MMA co MAZ)有较大的光致双折射效应 ,Δn～ 6 .6 0× 10 -4 ;同时DAP PGMA比P(MMA co MAZ)具有更快的开启速度 ,光致向向异性上升时间为 40 ps,这种皮秒量级的快过程对应于双偶氮苯生色团的顺反异构过程。     

Characterization of Femtosecond Low—Temperature—Grown GaAs Photoconductive Switch

A photoconductive response time,as short as 350fs,of a low-temperature-grown GaAs(LT-GaAs) micro-coplanar photoconductive switch has been measured and modelled to the ultrafast trapping of the photoexcited carriers in LT-GaAs.The coherent interference of the pump and probe pulses results in a narrow spike photocurrent autocorrelation signal which maps the femtosecond optical pulses.