フラウンホーファー回折

Fraunhofer diffraction

[目次：理論(電子の散乱／回折／結像)]

光源、観測点が共に物体から無限の距離にあり、入射波も出射波も平面波とみなせるときの回折現象をいう。透過電子顕微鏡を用いて、平行な入射ビームを物体に照射し、レンズを用いてその後焦面上にできる回折図形が、フラウンホーファー回折図形である。

"Fraunhofer diffraction" means a diffraction phenomenon where both an electron source and an observation point are located infinitely far from an object, thus both incident and exit waves can be regarded as plane waves. When an object is illuminated with a parallel incident beam, a diffraction pattern formed on the back focal plane of the objective lens is called a Fraunhofer diffraction pattern.

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