Purpose: Show diffraction by arrays of complex figures.
Description: Twelve slides are used with a laser to produce diffraction patterns from complex-shaped arrays of apertures and/or obstacles. Plates are: (1) double slits, (2) multiple slits, (3) slit to square transition, (4) random and regular arrays of dot apertures, (5) Babinet's principle with circular apertures and obstacles, (6) Babinet's principle using + signs, (7) Babinet's principle with quad slits of different spacings, (8) fun patterns, obscured apertures in random array, (9) random circular obstacles - 0.20mm diameter, (10) random circular obstacles - 0.10mm diameter, (11) random circular apertures - 0.10mm diameter. Examples are given in the photographs below; the dynamic range of the camera limits the intensity range much more severely than your eye.
