Basic laser experiment: The transmission grating is composed of a large number of parallel, equally spaced and equally wide transparent slits. The sum of the width of the transparent area and the width of the opaque area d is the period of the grating, which determines the basic properties of the grating and is generally called the grating constant. When a light beam with a wavelength of λ is incident vertically on a grating with a period of d, the transmitted light passing through each transparent area (i.e., grating slit) will be diffracted in all directions, as shown in Figure 3.
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