园偏振光的干涉图样

INTERFERENCE PATTERNS FROM CIRCULAR POLARIZED LIGHT

在迈克尔逊干涉仪两臂的相干光是旋转方向相反的园偏振光,它们重新叠加就是线偏振光,其振动方向取决于两相干光之间的位相。当在干涉仪输出端放一线偏振器,并旅转之,可看到干涉条纹地移动。如果视场中看到园形条纹,不断在一个方向转动偏振器,可使园形条纹不断扩展或收缩。

Coherent light in the two arms of a Michelson interferometer are made circularly polarized but with opposite rotations. When the two beams recombine.the light is linearly polarized but the direction of poiarizetion changes depending on the phase between the two beams. When a linear palarerer is used on the output and rotated,the observed interference fringe pattern shifts. It the field of view contains circular fringes,the continuous rotations of the polarzer in one direction makes the circles contionuously expand and contract.