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

• Alan J. DeWeerd ^[1]
  1. [1] University of Redlands

     University of Redlands

     Estados Unidos

     
• Localización: The Physics Teacher, ISSN 0031-921X, Vol. 54, Nº. 5, 2016, págs. 300-301
• Idioma: inglés
• Texto completo no disponible (Saber más ...)
• Resumen

  • 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.