光的干涉和干涉系统.ppt

Homework (11-5) 1. Using red cadmium light, ?=643.8nm, Michelson in his original experiment could still see interference fringes after he had moved one of the mirrors 25cm away from the coincidence position. How many fringes did he count? P244 916 Armand H. L. Fizeau Armand H. L. Fizeau (1819-1896), French physicist, was born of a wealthy French family that enabled him to be financially independent. Instead of shunning work, however, he devoted his life to diligent scientific experiment. His most important achievement was the measurement of the speed of light in 1849. Albert Abraham Michelson Albert Abraham Michelson (1852-1931) was born in Strelno, Prussia. He moved to the United States with his parents when he was 2. He graduated from, and taught at, the U. S. Naval Academy and later worked at the Case School of Applied Science, Clark University and the University of Chicago. In 1907 he was awarded the Nobel prize in physics, the first American scientist to be so honored. Michelson is best known for his precise determination of the velocity of light, for inventing the interferometer that bears his name. He also made noteworthy contributions to astronomy, spectroscopy and geophysics, was proficient in tennis and other sports, played the violin, and liked to paint landscapes. Frank Twyman He is a manager, at Adam Hilger Ltd., astronomical and optical instrument makers in London. The Twyman interferometer is particularly useful for the testing of optical components such as lenses, prisms and mirrors. * 第五节 典型的双光束干涉系统及其应用 一、典型干涉系统 1、斐索 ( Fizeau ) 干涉仪：等厚干涉型的干涉仪 L3 G L2 P Q L1 激光平面干涉仪 1）激光平面干涉仪 的组成和工作原理 a 2）主要用途 ? 测定平板表面的平面度和局部误差 ? 测量平行平板的平行度和小角度光楔的楔角 ? 测量透镜的曲率半径 ? 测量平行平板的平行度和小角度光楔的楔角 L3 G L2 Q L1 激光平面干涉仪 a D h R1 R2 P Q ? 测量透镜的曲率半径 牛顿环 球面干涉仪 L L L L P Q 小结： 基本特点：（1）属于等厚干涉 （2）干涉光束，一个来自标准反射面，一个来自被测面。 重点掌握：（1）光程差与厚度的关系。 （2）厚度变化与条纹弯曲方向的关系。 （3）干涉面间距变化与条纹移动的关系。 条纹分析： 2、迈克尔逊干涉仪 （The Michelson interferometer） Extended source Beam splitter Reflecti