利用光纤传感器进行激光测量

自1960年红宝石激光器问世以来,各种气体、固体激光器的开发与性能的提高都取得很大进展。激光具有直线传播、方向性好、单色和可干涉性等特征,有效地利用这些特征的高灵敏度、高精度、非接触     

MO－PVA与EO－PVA膜片双色光子存储

首次用ＭＯ－ＰＶＡ、ＥＯ－ＰＶＡ两种样品．在５１４ｎｍ波长光激发下，实现了６３３ｎｍ可擦除光存储，并研究了写入光束对预激发光的依赖关系，用四能级双色光子共振模型对各种实验现象进行了解释。     

Effects of Induced Flux on Andreev Levels in a Quantum Point Contact Embedded in Superconducting Ring

We investigate the effects of flux induced by persistent current on the states of Andreev levels in a quantum point contact (QPC) embedded in a superconducting ring. The Andreev levels correspond to the bound states in the QPC created by multiple reflection at the boundaries. We self-consistently calculate the eigenstates and persistent current of such a system with different external fluxes threaded through the ring by using a tight-binding model with Bogoliubov-de Gennes potential. We show that the induced flux can significantly change the dependence of the Andreev levels and the persistent current on the external flux if the inductance of the system is large. By solving the time-dependent Schroedinger equation we obtain the dynamical behaviour of Andreev states in the presence of flux oscillations in the equivalent LC circuit.     

四制式彩色解码集成电路TDA4550

引言众所周知,目前世界上存在着三种彩色电视制式,即PAL制、SECAM制和NTSC制。由于NTSC制中又有彩色副载频为3.58MHz的NTSC_(3.58)和彩色副载频为4.43MHz的彩     

连续染料激光的波长测定

本文采用美国光谱物理公司380D稳频的环形染料激光器为光源,三种国产激光波长测试仪器;光栅单色仪及激光数字波长仪,同时测定了同一激光波长,比较了它们的优缺点(精密度,测量速度,操作难易程度,价格等)和适用性。     

半导体激光后向定位仪

一种可见光半导体激光后向接收定位，测位仪，达到了先进的技术性能，在钢铁、冶金等行业具有较好的应用前景。     

无绳电话中的压扩芯片MC33111

ＨＣ３３１１１是音频电路中的专用压扩芯片。文章介绍了ＭＣ３３１１１的特点、工作原理、引脚功能，最后介绍了应用及设计时需注意的事项．