|
|
|
|
|
|
|
Code Number: 6D20.50
Demo Title: Diffraction - Crossed Screens & EPROMS
Condition: Good
Principle: Two-Dimensional Gratings
Area of Study: Optics, Astronomy
Equipment:
Helium-Neon Laser (2 to 5 mW), Optics Bench, Meter Stick, Plastic Ruler (Clear) with cm Marks, Tape Measure (25 ft.), Mesh Screens (3, Standard U.S.), Laser Pointer, and Slides Folders Containing a Very Fine Mesh Screen.
Procedure:
Two dimensional diffraction can be shown with the mesh screens. Just put them into the path of the laser beam and observe the patterns.
The holographic "rainbow" glasses that are used to view fireworks are essentially crossed diffraction grating. Place the lens of the glasses into the path of a laser beam and observe the diffraction pattern.
The slides contain a very fine mesh screen. The screen is fine enough that it shows not only a two dimensional diffraction pattern, but also an interference beat pattern.
An EPROM chip will also give a two dimensional diffraction pattern which can be reflected onto a nearby screen.
References:
- Lian Hu, Yi-Xiang Wang, "Visualizing Light Beams Diffracted by a CMOS Sensor with a Fluorescent Dye", TPT, Vol. 62, #8, Nov. 2024, p. 658.
- Kristin Rabosky, Colin Inglefield, Kiley Spirito, "Interference and Diffraction in Modern Technology: A New Approach for an Introductory Physics Laboratory Experiment", TPT, Vol. 58, #9, Dec. 2020, p. 646.
- Fabrizio Logiurato, Luigi Gratton, and Stefano Oss, "Optical Simulation of Laue Crystal Diffraction with New Experiments on Diffraction", TPT, Vol. 58, #2, Feb. 2020, p. 130.
- Ravi Kant Avvari, "Two-Dimenional Diffraction Pattern by a Silk Cloth", TPT, Vol. 58, #1, Jan. 2020, p. 46.
- Jennifer J. Birriel, "Diffraction by 'Sheer Coincidence'", TPT, Vol. 56, #9, Dec. 2018, p. 648.
- Tom Ekkens, "Two-Dimensional Light Diffraction From an EPROM Chip", TPT, Vol. 56, #2, Feb 2018, p. 70.
- R. B. Allen, "Laser, Crossed Diffraction Gratings, and Smoke Box", AJP, Vol. 39, #10, Oct. 1971, p. 1271.
- D. Rae Carpenter Jr. and Richard B. Minnix, "S-225. Scarf and Hosiery", DICK and RAE Physics Demo Notebook, 1993.
- D. Rae Carpenter Jr. and Richard B. Minnix, "O-515. Wire & Photo Mesh with Laser", DICK and RAE Physics Demo Notebook, 1993.
- G. D. Freier and F. J. Anderson, "Ol-13", A Demonstration Handbook for Physics.
- G. D. Freier and F. J. Anderson, "Ol-10", A Demonstration Handbook for Physics.
- Jearl Walker, "6.104. Lights Through a Screen, Lines Between Fingers", The Flying Circus of Physics Ed. 2, p. 283.
- Gordon McComb, "Laser, Ray Guns, & Light Cannons", p. 124.
- Brian Jones and Matt Fackelman, "Diffraction Screen- The Other Light Phenomenon", Don't Forget the Duct Tape! - The How and Why of the Experiments of the Little Shop of Physics - A Work in Progress, p. 37.