Experimental Analysis of Classical Arago Point with White-Light Laser
Experimental Analysis of Classical Arago Point with White-Light Laser
复制标题
白光激光经典阿拉戈点的实验分析
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
K. Fujii
中科院分区：
文献类型：
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作者：
K. Uno;Masahiro Suzuki;K. Fujii
阿拉戈点是衍射的结果，出现在障碍物（如球或圆盘）阴影的中心部分的亮点。利用这个阿拉戈点，我们可以判断一个球的球度和一个圆盘的圆度，但很难区分球和圆盘。为了解决这个问题，还需要观察z坐标分量。作为这样做的一种方法，我们旋转磁盘并观察其衍射图样作为旋转角度的函数。利用白光激光器作为光源，三电荷耦合器件（3-CCD）相机作为探测器，我们观察到了Arago点的变形和圆形条纹的畸变等新现象。另外，衍射角对颜色（波长）的依赖关系也可以从可见的角度直接理解。
The Arago point is a bright spot that appears at the center portion of the shadow of an obstacle such as a ball or a disk as the result of diffraction. Using this Arago point, we can judge the sphericity of a ball and the circularity of a disk, but it is difficult to distinguish the ball or the disk. To solve this problem, it is also necessary to observe the z coordinate component. As a method for doing this, we rotated the disk and observed its diffraction pattern as a function of the rotation angle. By employing the white-light laser as the light source and a three charge coupled device (3-CCD) camera as the detector, we have observed novel phenomena, for instance the deformation of the Arago point and the distortion of the circular fringes. Also, the color (wavelength) dependence of the diffraction angle could be directly understood in a visible sense.