Two identical glass wedges are combined in this device (see Fig. 89). In Position #1 the two wedges are in contact and form the equivalent of a plane parallel plate of glass. Thus, the laser beam passes through without displacement and appears on the screen at A.
The sketch below illustrates the experimental setup which simulates an electron microscope (EM) imaging a two-dimensional lattice. The same setup can also be used to demonstrate x-ray diffraction effects.
Two front surface mirrors are positioned to intercept the input laser beam and to scan it over field AB. Lens L is positioned in the beam’s path and focuses the beam on a screen or recording medium. Mirrors M1 and M2 are oscillating or continuously rotating in a synchronized manner but the speed of rotation of M1 is double that of M2. The axis of rotation of M1 is equidistant from that of M2 and the center of lens L.
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