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Why Can Blu-rays Hold More Than DVDs?

Blu-rays can hold about ten times more than DVDs because Blu-ray players use special blue lasers to read them. But it took a while for scientists to figure out how to make those lasers work.

Hosted by: Michael Aranda
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Sources:

Basics on Blu-Ray & Optical Discs
http://www.blu-ray.com/faq/
http://www.explainthatstuff.com/cdplayers.html

Optics
http://www.edmundoptics.com/technical-resources-center/imaging/wavelength-effects-on-performance/
http://voer.edu.vn/m/aberrations/986b67d8

On Nakamura
http://www.nobelprize.org/nobel_prizes/physics/laureates/2014/nakamura-facts.html
http://www.npr.org/templates/story/story.php?storyId=5488821
https://goo.gl/LkpI82

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