CD - CD/DVD Diffraction Abstract: This experiment was...

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CD/DVD Diffraction Abstract: This experiment was performed in order to calculate and compare the spacing between the tracks on a CD and a DVD by using the media diffraction gratings. By using a laser to observe the diffraction pattern for a CD and a DVD we were able to calculate the track spacing, order and angle values and distance measurements for both discs. Our results turned out to be consistent with the known values for the track spacing on the CD and DVD based on the diffraction pattern calculations with very low percent errors. Introduction In this experiment, we calculated and compared the spacing between the tracks on a CD and a DVD by using the media diffraction gratings. CD’s and DVD’s have revolutionized how text, graphics, music and movies are stored for use in computers,
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sound systems, and televisions. They both use interference patterns in interesting ways in order to accomplish this. Each contains a spiral track that hold s the information, which is detected using a laser beam that reflects from the bottom of the disc. The information is recognized in the form of raised areas on the bottom of the disc. These raised areas appear as pits when viewed from the top or labeled side of the disc. These pits are separated by flat areas called “land.” The CD’s and DVD’s are played by using a laser beam that strikes the bottom surface and reflects from it. Since the pit dimensions are smaller in DVD’s, the DVD has more information storage capacity than a CD. Procedure We began setting up the experiment by placing a CD in a clamp about 1.75 meters from the wall. We turned the stand so that the reflective surface of the CD was facing towards the wall. Then, we placed another stand about 0.5 meters from the CD between the CD and the wall, and placed a laser pointer in this clamp. Once everything was in place, we shined the laser beam directly onto the CD with a 0° angle of incidence so that the interference pattern was reflected onto the wall behind the laser. We marked the point of the central bright spot as well as the first 2 maxima on either side in the
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This note was uploaded on 04/30/2008 for the course PHYS 202 taught by Professor Johnson during the Fall '07 term at South Carolina.

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CD - CD/DVD Diffraction Abstract: This experiment was...

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