New hope for terahertz: New laser operates at higher temperatures than some thought possible

Terahertz rays -- radiation between microwaves and infrared rays on the electromagnetic spectrum -- are a promising means of detecting explosives, but they've proven hard to generate cost effectively. So far, solid-state lasers -- the cheap, miniature type of laser found in CD players -- have been unable to produce terahertz rays unless they’re supercooled, which makes them impractical for mass deployment.

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