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ERIC Number: EJ1100302
Record Type: Journal
Publication Date: 2016-May
Pages: 2
Abstractor: As Provided
ISSN: ISSN-0031-921X
CD, DVD, and Blu-Ray Disc Diffraction with a Laser Ray Box
DeWeerd, Alan J.
Physics Teacher, v54 n5 p300-301 May 2016
A compact disc (CD) can be used as a diffraction grating, even though its track consists of a series of pits, not a continuous groove. Previous authors described how to measure the track spacing on a CD using an incident laser beam normal to the surface or one at an oblique angle. In both cases, the diffraction pattern was projected on a screen and distance measurements allowed the track spacing to be calculated. I propose an alternative method using a laser ray box, which is also applied to a DVD and a Blu-ray disc.
American Association of Physics Teachers. One Physics Ellipse, College Park, MD 20740. Tel: 301-209-3300; Fax: 301-209-0845; e-mail:; Web site:
Publication Type: Journal Articles; Reports - Descriptive
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Grant or Contract Numbers: N/A