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Simple laser scanning system in the paraxial approximation. A collimated input beam is deflected by a scanning mechanism, such as a galvonometric mirror. Two lenses are used in a 4f configuration to image the scanning device to the back aperture of the illumination objective, as indicated by the red dashed lines. The lens closest to the scanner is referred to the scan lens, and has focal length f s, while the other lens is referred to as the tube lens and has focal length f t.
