Vertical Cavity Surface Emitting Lasers (VCSELs) are a type of semiconductor laser diodes. Unlike edge emitting laser diodes, VCSELs emit upwards and thus can be easily packaged as emitter arrays containing hundreds of emitters on a single chip.
The unique characteristics of THz radiation make it useful in such applications as medical imaging (for example cancer detection), materials characterization, high speed communications, and homeland security surveillance.
Lasers are certainly changing ways that our soldiers and sailors are neutralizing their targets. It is a rapidly emerging technology sector that is allowing our armies and navies to operate more efficiently during conflicts.