Grating Intensity Comparison

强度比较

The grating intensity expression gives a peak intensity which is proportional to the square of the number of slits illuminated. Increasing the number of slits not only makes the diffraction maximum sharper, but also much more intense. If a 1 mm diameter laser beam strikes a 600 line/mm grating, then it covers 600 slits and the resulting line intensity is 90,000 x that of a double slit.

光强表达式给出的峰值光强与被照明的狭缝数的平方成正比。增加狭缝数不仅使衍射极大值更尖锐，而且更加强烈。如果一个直径为1毫米的激光束照射到600线/毫米的光栅上，它将覆盖600条狭缝，产生的光强是双缝情况的90,000倍。

As the intensity increases, the diffraction maximum becomes narrower as well as more intense. When you have 600 slits, the maxima are very sharp and bright and permit high-resolution separation of the maxima for different wavelengths. Such a multiple-slit is called a diffraction grating.

当强度增加时，衍射极大值也会变窄且更明亮。当有600条缝时，极大值非常尖锐且明亮，能够实现对不同波长极大值的高分辨率分离。这样的多缝装置称为衍射光栅。

Multiple slit diffraction

多缝衍射

Index

Diffraction concepts

Fraunhofer diffraction

索引衍射概念夫琅禾费衍射

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Grating Intensity

强度

The two aspects of the grating intensity relationship can be illustrated by the diffraction from five slits. The intensity is given by the interference intensity expression

强度的两个方面可以通过五条缝的衍射来说明。强度由干涉强度表达式给出

modulated by the single slit diffraction envelope for the slits which make up the grating:

由构成光栅的狭缝的单缝衍射包络调制：

Their product gives the total intensity expression:

它们的乘积给出了总强度表达式：