Diffraction gratings work both for transmission of light, as in Figure 17.13, and for reflection of light, as on the butterfly wings or the Australian opal shown in Figure 17.14, or the CD pictured in the opening illustration of this chapter. A diffraction grating can be manufactured by scratching glass with a sharp tool to form a number of precisely positioned parallel lines, which act like slits. An interference pattern is created that is very similar to the one formed by double-slit diffraction (see Figure 17.8 and Figure 17.9). Such an arrangement of slits is called a diffraction grating. No, a laser would have on the order of 10 23 excited atoms.Īn interesting thing happens if you pass light through a large number of evenly-spaced parallel slits.Yes, a laser would have only one excited atom.No, a laser would have several million excited atoms.No, a laser would have two excited atoms.Is that the case for a real laser? Explain. In the animation there is only one excited atom. Change the excitation level and try to match it to the incoming photon energy. Change the energy of the incoming photons, and see if you can match it to an excitation level that will produce pairs of coherent photons. This animation allows you to examine the workings of a laser. A laser beam is used to change the shape of the lens of the eye, thus changing its focal length.
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