Demonstrations

Laser Speckle Pattern

Code Number :	6D20.75
Disclaimer:	Reprinted by permission of Dick Berg, University of Maryland, for use on this website. The demonstrations contained and referenced herein are listed for the purposes of cataloging and describing physics demonstrations which should be conducted only under the direction of a trained instructional support professional or physicist. These demonstrations are not presented for the purpose of being conducted by persons unconnected to this Facility and/or persons not consulting with or being supervised by the recognized instructional support professional or physicist and his/her staff. The University is responsible only for those demonstrations carried out using its own equipment using established safety and scheduling policies, and bears no responsibility for those choosing to use this source material for their own purposes. All demonstrations described and contained herein are public domain, and can also be found in reference materials in libraries, bookstores, and electronic sources. Further information regarding legal liability in use of demonstrations and labs will be found on the web site Injuries in School/College Laboratories in USA. The University of Iowa Disclaimers: University of Iowa Disclaimer All Rights Reserved..
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).

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, (8/1/2001).

"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.

Mail Questions and Comments to: Dale Stille