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DVD’s New Cousin Can Store More Than a Petabit
(spectrum.ieee.org)
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this post was submitted on 23 Feb 2024
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The spot size is the size of the point the laser focuses on. It seems with the material they've used that there is some kind of interference between the two lasers they use to make a pit smaller than you would expect. There's not a whole lot of information in the article to understand the details. Also, I'm just a guy who works on lasers, getting C's in my optics class currently so take it with a massive dose of salt