6D20.23 - Gratings - Phase or Holographic Gratings

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

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.

  • Francisco Jose Torcal-Milla, "Diffraction of Light Through a Hummingbird's Wings", TPT, Vol. 61, #9, Dec. 2023, p. 816.
  • 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.

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