Mid-infrared lasers emit laser like beams and have wavelength ranging from 3 ?m to 8 ?m. These lasers may either contain some shorter-wavelength laser or a mid-infrared (mid-IR) combined with means required for nonlinear frequency conversion. Mid-infrared lasers are in great demand for variety of applications including polymer and plastic processing, pumping optical parametric oscillators (OPOs), free space communications, remote sensing, laser scalpel, non-invasive medical diagnosis, and spectroscopy. Various defense related applications on mid-infrared lasers are emerging such as covert communications systems, eyesafe seekers for smart munitions, stand-off detection of explosion hazards, and countermeasures. Mid-infrared laser market is relatively small as compared to the total laser market, but it is showing fastest growth in demand among all types of lasers.