Bruce C F
Division of Applied Physics, National Standards Laboratory, CSIRO, Sydney, Australia.
Appl Opt. 1966 Sep 1;5(9):1447-52. doi: 10.1364/AO.5.001447.
A method of keeping the optical plates of a scanning Fabry-Perot interferometer parallel when setting on fringe maxima is described. The method needs no additional instrumentation other than the duplication of some of the electronic detection equipment needed for normal use of the instrument. Small oscillatory rotational movements about two axes at right angles are applied to one of the interferometer plates, while the other is moving axially in an oscillatory fashion. The transmitted light flux from the interferometer is detected with the single photodetector, and the electrical signal contains components at different frequencies that can be used to measure and control precisely the plate separation and plate parallelism of the interferometer. Experiment and analysis show that for path differences up to 200 mm using the mercury 198 green line as the light source, the parallelism of the plates can be controlled to better than 10(-8) rad, if parameters in the interferometer system are chosen suitably. For path differences up to 100 mm, the accuracy approached 10(-9) rad. With laser light, the method should be applicable for long path differences. Vibration and medium stability would be the limiting factors.
描述了一种在扫描法布里-珀罗干涉仪设置为条纹最大值时保持光学平板平行的方法。该方法除了重复仪器正常使用所需的一些电子检测设备外，不需要额外的仪器。以直角绕两个轴进行小的振荡旋转运动施加到干涉仪的一个平板上，而另一个平板以振荡方式轴向移动。用单个光电探测器检测来自干涉仪的透射光通量，电信号包含不同频率的分量，可用于精确测量和控制干涉仪的平板间距和平行度。实验和分析表明，以汞198绿线作为光源，对于光程差达200毫米的情况，如果干涉仪系统中的参数选择合适，平板的平行度可控制在优于10^(-8)弧度。对于光程差达100毫米的情况，精度接近10^(-9)弧度。使用激光时，该方法应适用于长光程差。振动和介质稳定性将是限制因素。
