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

2016; American Association of Physics Teachers; Volume: 54; Issue: 5 Linguagem: Inglês

10.1119/1.4947160

1943-4928

Alan J. DeWeerd,

Advanced Optical Imaging Technologies

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.