Found their site and there's a timeline page.
On the 1970's page theres some info about the Shiva lazer, which was the lazer used in Tron. The PDF file gives some nice info about the laser and it's history.
http://www.llnl.gov/timeline/70s.html
Check out the Nova laser, Shivas preddicessor.
Man, look at the size of that sucker. Look at it's PDF file to find out more about it as well.
http://www.llnl.gov/timeline/80s.html#
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