Far-infrared laser
Far-infrared laser or terahertz laser ( FIR laser , THz laser ) is a laser with output wavelength in between 30-1000 µm ( frequency 0 . 3-10 THz ) , in the far infrared or terahertz frequency band of the electromagnetic spectrum . 
<triplet> Far-infrared laser <subj> laser <obj> subclass of <triplet> wavelength <subj> frequency <obj> calculated from