Terahertz rays � radiation between microwaves and infrared rays on the electromagnetic spectrum � are a promising means of detecting explosives, but theyve 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 theyre supercooled, which makes them impractical for mass deployment.
Source:
http://web.mit.edu/newsoffice/2010/terahertz-laser-1216.html
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