opticalmedia - Diffraction From Optical Storage Media Due:...

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Diffraction From Optical Storage Media Due: November 8, 2005 Physics 212L Tuesday 12:30 – 2:30 Cycle 4 – North Charles Greaser Thomas Wright Abstract : In this experiment, we measured the track spacing on a compact disc and a digital video disc by using them as a diffraction grating with a light of known wavelength. We determined the CD to have a track spacing of 1.58x10^-6m. This results in an error of 1.5 percent when compared to the manufacturers stated value for track spacing. We were unable to determine the track spacing of the DVD due to constraints imposed in the laboratory area.
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Introduction : A diffraction grating is a device that is similar to a double slit arrangement, only the number of slits is much greater. The advantage of this is that you can determine the wavelength of incident light by measuring the distance between the maxima in the interference pattern. Because the order number of the maxima and the sine of the angle formed those maxima are related by the slit spacing and the wavelength, we can obtain a formula that shows this relationship: D*sin(a)=n*(wavelength) Procedure : 1. Obtain a light source of known wavelength, a CD, a DVD, a three fingered clamp, a lab
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This note was uploaded on 04/15/2008 for the course PHYS 211-212 taught by Professor Dontknow during the Spring '08 term at South Carolina.

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opticalmedia - Diffraction From Optical Storage Media Due:...

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