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"Self-education is, I firmly believe, the only kind of education there is."
- Isaac Asimov

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.

This term was coined by Herbert for the Dune universe.

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.

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

I’ve only seen it used one other time, in Pater One, Pater Two (1969) by Patrick Meadows; published in F&SF:

He scanned the neighboring walls with a torch. "The doors were probably electrically operated. The power is off at this end. Somewhere there is a switch for the door and a generator.”

"Start looking. Mehmet and I will work on the metal with a lasgun in the meantime.”

… When he returned to the tunnels, the lights were on, and Osman was cursing tightly in front of the door. He had spent the power pack of one gun trying to cut through, and then the door had simply started sliding back into the wall when the power came on. It was stuck half open because the jagged edges of the laser cut wouldn’t clear.

Its 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). See the blaster (1925) from When the Green Star Waned by Nictzin Dyalhis, the neutron blaster (1951), from The Complete Paratime, by H. Beam Piper and the heat ray from The War of the Worlds (1898), by H.G. Wells.

Compare to nuclear shears from Foundation (1951) by Isaac Asimov, the toaster from Accidental Flight (1952) by WF Wallace, the Slaver disintegrator from Ringworld (1970) by Larry Niven and the atomic torch from One Against the Legion (1939) by Jack Williamson.

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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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