7G20.30 - Laser Speckle Pattern

See paragraph one in the procedure section.
Code Number:
7G20.30
Demo Title:
Laser Speckle Pattern
Condition:
Good
Principle:
Two-Dimensional Gratings
Area of Study:
Optics, Astronomy
Equipment:
Laser with diffusing lens, ground glass plate.
Procedure:

Place the diffusing lens on the laser and shoot through the ground glass plate onto a screen.  Try to make the speckle pattern at least 6" in diameter for good viewing.

References:
  • Jay M. Pasachoff, "Grazing Incidence Reflection and X-Ray Images",  TPT, Vol. 41, # 6, Sept. 2003, p. 318.
  • Hasan Fakhruddin,  "Specular Reflection from a Rough Surface",  TPT, Vol. 41, # 4, p. 206, April 2003.
  • Pietro Ferraro, "Speckle Noise or Dust Diffraction?", TPT, Vol. 37, # 6, Sept. 1999, p. 324.
  • John L. Carlsten,  "Laser Speckle",  TPT, Vol. 25, # 3, p. 175, March 1987.
  • Hasan Fakhruddin, "Specular Reflection from a Rough Surface", TPT, Vol. 41, #4, April 2003, p. 206-207.
  • Thomas B. Greenslade, Jr., "Reflection of Particles (Photo)", AJP, Vol. 71, # 9, Sept. 2003, p. 877.
  • Maurizio Vannoni and Giuseppe Molesini, "Speckle Interferometry Experiments With A Digital Photocamera", AJP, Vol. 72, # 7, July 2004, p. 863.
  • R. D. et al.,  "Young's Double-Slit Experiment Using Speckle Photography",  AJP, p. 531, Vol. 56, No. 6, June 1988.
  • Jearl Walker,  "The "Speckle" on a Surface Lit By Laser Light Can Be Seen with Other Kinds of Illumination",  The Amateur Scientist, Aug. 2001.
  • T. Kallard, "Method and Procedure for Eye Testing with Laser Speckle", Exploring Laser Light, p. 165.
  • T. Kallard, "Laser Speckle Phenomenon", Exploring Laser Light, p. 160.
  • Jearl Walker, "6.124, Speckle Patterns", The Flying Circus of Physics Ed. 2, p. 293.
  • "62, Laser Speckle",  Christopher P. Jargodzki and Franklin Potter,  Mad About Physics, p. 20, p. 171.
  • Gordon McComb,  Lasers, Ray Guns, & Light Cannons - Projects from the Wizard's Workbench, p. 70.
  • Raymond Bruman,  "Long Path Diffraction",  Exploratorium Cookbook I, p. 8.1.

Disclaimer: These demonstrations are provided only for illustrative use by persons affiliated with The University of Iowa and only under the direction of a trained instructor or physicist.  The University of Iowa is not responsible for demonstrations performed by those using their own equipment or who choose to use this reference material for their own purpose.  The demonstrations included here are within the public domain and can be found in materials contained in libraries, bookstores, and through electronic sources.  Performing all or any portion of any of these demonstrations, with or without revisions not depicted here entails inherent risks.  These risks include, without limitation, bodily injury (and possibly death), including risks to health that may be temporary or permanent and that may exacerbate a pre-existing medical condition; and property loss or damage.  Anyone performing any part of these demonstrations, even with revisions, knowingly and voluntarily assumes all risks associated with them.