Apple invests $390 million in the production of...lasers?

Apple has invested $390 million in Finisar, a manufacturer of optical communications components.  
That's right: It's investing in lasers. 
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According to Apple, the money will enable Finisar to increase research and development of vertical-cavity surface-emitting lasers (VCSELs). These may sound like something straight out of a sci-fi thriller, but they're already used in some of the iPhone X's standout features