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"I think we're still on that topic, still trying to figure out what computers are, how they change us, why we use them."
- Neal Stephenson

Lasgun  
  A continuous-wave laser projector; can be used as a weapon or as a cutting tool.  

The lasgun is another in a series of laser-based weapons; the descendant of the "blasters" of the science fiction of the 1920's.

Kynes took a deep breath, said: "This door should hold for at least twenty minutes against all but a lasgun."

"They'll not use a lasgun for fear we've shields on this side," Paul said.

From Dune, by Frank Herbert.
Published by Putnam in 1965
Additional resources -

It's use as a weapon is limited by subatomic fusion that occurs when the beam of a lasgun (offensive weapon) intersects that of a shield using the Holtzman field (defensive weapon).

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Additional resources:
  More Ideas and Technology from Dune
  More Ideas and Technology by Frank Herbert
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