This java applet generates Fresnel diffraction patterns, which
are the shadows cast by small apertures when using a plane
source of monochromatic light as a light source. When you start
up the applet, a circular aperture will be used. This is the
pattern generated when a plane source of monochromatic light is
shined on a small circular hole (about 5 mm across) in an
otherwise opaque object. The red line is the outline of the
geometrical shadow (the shadow which would be cast if there were
no diffraction). You can select a different aperture shape (such
as a half plane, double slit, triple slit, rectangle, etc.) from
the Aperture popup. Or you can change the size of the circle by
dragging the red line with the mouse. |Special Thanks to Paul
Falstad, www.falstad.com| - Laser Drilling - Material Guidance -
Exact Leaks - Flow Calibration - Laser Marking - Quality
Assurance