| DCS # | DEMONSTRATION | REFERENCE | ABSTRACT |
|---|
| 6C20.00 | Diffraction Around Objects | | |
| 6C20.10 | Arago's (Poisson's) spot | PIRA 200 | Shine a laser beam at a small ball and look at the diffraction pattern. |
| 6C20.10 | laser and diffraction objects | 6C20.10 | A laser beam is diffracted around balls. |
| 6C20.10 | Arago white spot | AJP 36(4),ix | A corridor demonstration of using a flashlight bulb, a ball bearing and a small telescope. |
| 6C20.10 | diffraction about a circular object | L-78 | A
coin is placed between a pinhole and a screen. A small hole is punched in
the screen in the shadow of the coin. While looking at the coin through the
hole, a ring of light will be seen. |
| 6C20.10 | Arago's spot | O-7f.3 | Arago's spot with a small lamp, telescope, and ball bearing over a 90' distance. |
| 6C20.10 | Poisson's bright spot | Disc 23-05 | A point source is used to illuminate a small ball. |
| 6C20.12 | photographing diffraction | AJP 35(2),xix | Simple setup of a camera with the lens removed, an object and a flashlight bulb. |
| 6C20.13 | large scale diffraction | AJP 44(1),70 | Use a penny and a long light path. |
| 6C20.13 | diffraction around a coin | 35-3.5 | Project the shadow from a point source onto a translucent screen. |
| 6C20.15 | knife edge diffraction | PIRA 500 | |
| 6C20.15 | diffraction around objects | Ol-21 | Diffraction of laser light around a razor edge, wires, small balls, etc. is viewed on a screen. |
| 6C20.15 | knife edge diffraction | Disc 23-08 | Slowly move a knife edge into a laser beam. |
| 6C20.16 | laser diffraction objects | 36-5.2 | A list of recommended diffraction objects for use with laser beams. Pictures. |
| 6C20.17 | diffraction around large objects | AJP 38(3),348 | Expand
a laser beam to 1-3" and look at the diffraction pattern of large objects.
A folded optical path brings the viewing screen close to the object. |
| 6C20.18 | Fresnel diffraction | L-77 | Objects placed between a pinhole and a screen show striking diffraction patterns. |
| 6C20.20 | thin wire diffraction | PIRA 500 | |
| 6C20.20 | thin wire diffraction | 6C20.20 | |
| 6C20.20 | diffraciton pattern of a hair | AJP 45(4),404 | Put a hair in a laser beam. |
| 6C20.20 | fake double slit | AJP 41(7),931 | Put a straight pin in the laser beam. |
| 6C20.20 | diameter of a hair by diffraction | AJP 42(5),412 | Use Babinet's principle to measure the diameter of a hair by the fringes. |
| 6C20.20 | thin wire diffraction | Disc 23-04 | Place
a .22 mm dia wire in a laser beam and measure the diameter by the diffraction
pattern. Measurements can be taken from the video. |
| 6C20.22 | shadow of a needle | PIRA 1000 | |
| 6C20.22 | shadow of a needle | Disc 23-06 | A point source is placed behind a pair of needles. |
| 6C20.30 | pinhole diffraction | PIRA 500 | |
| 6C20.30 | pinhole diffraction | 6C20.30 | |
| 6C20.30 | Airy diffraction rings | 36-7.1 | As a laser beam is stopped down to a region of constant intensity, the Airy diffraction rings will appear. |
| 6C20.30 | pin hole diffraction | Disc 23-07 | A laser passes through a pinhole in aluminum foil. Data can be taken from the video. |
| 6C20.33 | triangular aperature | AJP 42(8),696 | The
Fraunhofer diffraction pattern of a triangular aperture is predicted by an
argument very similar to that used for a single slit. |
| 6C20.40 | zone plate lens | PIRA 1000 | |
| 6C20.40 | zone plate lens | Ol-23 | Use a photographic zone plate lens with an expanded laser beam. |
| 6C20.42 | zone plates on a laser printer | AJP 59(2),158 | A program to produce zone plates on a laser printer with discussion of limitations and applications. |
| 6C20.45 | microwave Fresnel zones | Ol-22 | A aluminum
sheet with concentric rings that can be removed and replaced in various configurations
is sized to work with a microwave transmitter. |
| 6C20.45 | microwave Fresnel diffraction | 33-7.14 | Circular apertures are cut in aluminum sheets to simulate zone plates. |
| 6C20.45 | microwave Fresnel zones | O-7i.2 | A 12 cm microwave Fresnel zone demonstration. |
| 6C20.46 | microwave zone plates | AJP 30(1),55 | The design of three varieties of microwave zone plates for 12 cm waves and lecture room use. |
| 6C20.51 | pass the razor blade | L-74 | Students hold a razor blade close to the eye so as to cut off part of an arc lamp. |
| 6C20.52 | diffraction peep show | L-76 | A 5 m long box holds a permanent diffraction setup. |
| 6C20.58 | parallel beam array | 35-3.4 | An array
of 25 small holes is projected to give parallel light beams which are used
with slits and apertures to give patterns on the wall. |
| 6C20.62 | diffraction by a feather | L-75 | An
image of a slit is blocked by a vertical rod. When a feather is placed between
the lens and slit, light is scattered by diffraction onto the screen. |
| 6C20.91 | viewing diffraction on TV | AJP 50(10),949 | If the laser beam is expanded, diffraction patterns can be projected directly onto the bare videcon tube. |