6D20.23 - Gratings - Phase or Holographic Gratings

See paragraph one in the procedure section.
See paragraph two in the procedure section.
Code Number:
6D20.23
Demo Title:
Gratings - Phase or Holographic Gratings
Condition:
Excellent
Principle:
Refraction and Dispersion
Area of Study:
Optics, Astronomy
Equipment:
5 inch X 5 inch Holographic grating, Slit Mask, Overhead Projector, Small laser pointer with different phase gratings to screw on.
Procedure:

Place the slit mask on the overhead projector and the grating on the head of the projector in the exit beam.  There is a piece of Velcro on the overhead to hold the grating.  Turn on the overhead and you will observe a rainbow spectrum.

Place the desired grating head on the laser. When turned on, a pattern made by the grating will be projected on the wall.  The patterns available are: Star, Spaceship, Hand, I Luv U, Star (points), and Spider Web.

References:
  • Philip Sadler, "Projecting Spectra for Classroom Investigations", TPT, Vol. 29, # 7, p.  423 - 427, October 1991.
  • Wallace A. Hilton, "W-10", Experiments in Optical Physics, p. 103.
  • Jodi and Roy McCullough, "Diffraction with Rainbow Glasses", The Role of Toys in Teaching Physics, p. 4.160.
  • S. F. Jacobs, "Advanced Experiments With Diffraction Gratings", Optical Sciences Center, The University of Arizona, 1996.
  • "Diffraction Grating, Simple", Selective Experiments in Physics, CENCO, 1962.
  • "The Diffraction Grating", Selective Experiments in Physics, CENCO, 1962.

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.