Cd players use an object with na 045 and laser wavelength, Ask an Expert

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CD players use an object with NA = 0.45, and laser wavelength A=780nm, whereas the new Blu-Ray disc players use NA= 0.85, λ = 405nm.

a) What is the spot use for CD players

b) What is the spot size for Blu-Ray players.

c) Calculate the ratio of the focal spot area for the Blu-Ray disc player compared to CDs (ie., Ratio= A _Blu-Ray, A_CD)

d) Assuming that the total information on use disc scales inversely with spot area, what would this predict for the number of Gigabytes for a Blu-Ray disc (CD ROMS are 700 MB (1 MB = 1 million byte)?

e) Is the spot-size reduction itself enough to explain the increased data storage of BluRay discs?

f) What else could account for the difference?

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Reference No.:- M91707739

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