I found what I was thinking of: "The Technical Case for Optical and Infrared SET... | Hacker News

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throwaway_yy2Di on June 23, 2014 | parent | context | favorite | on: A Laser Message from Space

I found what I was thinking of:

"The Technical Case for Optical and Infrared SETI"

http://seti.harvard.edu/oseti/tech.pdf

http://seti.harvard.edu/oseti/

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