$35
The key technology behind the Blu-ray disc is the blue laser, which has a wavelength of only 405nm (billionths of a meter). DVDs use a pure red laser with a wavelength of 650nm, and CDs use a 780nm wavelength infra-red laser. The benefit of having a blue laser with a shorter wavelength means it is possible to write smaller data pits, and significantly increase the amount of data stored on a disc.
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