Document Title

CD, DVD, and Blu-Ray Disc Diffraction with a Laser Ray Box

Department/School

Physics

Abstract

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.

Document Type

Article

Publication Title

The Physics Teacher

Publication Date

5-2016

Volume

54

Issue

5

Pages

300-301

Digital Object Identifier (DOI)

10.1119/1.4947160

Document Version

Publisher's version

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