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" I try to sit down at the typewriter four times a day, even if it's only five minutes, and write three sentences. And if I feel like going on, or if something turns me on I'll just keep writing till I'm written out."
- Roger Zelazny

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
  Tech news articles related to Dune
  Tech news articles related to works by Frank Herbert

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