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Estimating the storage capacity of a CD/DVD using diffraction

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Page 1: Estimating the storage capacity of a CD/DVD using diffraction

Estimating the storage capacity of a CD/DVD using diffraction

Page 2: Estimating the storage capacity of a CD/DVD using diffraction

CD/DVD drive

Image top: http://en.wikipedia.org/wiki/File:Dismdvd.jpgImage bottom: http://commons.wikimedia.org/wiki/File:DVD_querschnitt.svg (Creative Commons license)

http://en.wikipedia.org/wiki/File:Dismdvd.jpg
http://en.wikipedia.org/wiki/File:Dismdvd.jpg
Page 3: Estimating the storage capacity of a CD/DVD using diffraction

How does a CD/DVD store data?

Image: http://commons.wikimedia.org/wiki/File:DVD_CD_pits.PNG (Creative Commons license)

http://commons.wikimedia.org/wiki/File:DVD_CD_pits.PNG
http://commons.wikimedia.org/wiki/File:DVD_CD_pits.PNG
Page 4: Estimating the storage capacity of a CD/DVD using diffraction

Wavelength

Diffraction order m = +1

Diffraction order m = -1

Distance between rows of pits

Page 5: Estimating the storage capacity of a CD/DVD using diffraction

Measuring diffraction angles

You would record it as follows:

Also identify the wavelength of your laser.Then calculate d.


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