Longest wavelength semiconductor laser

In October 2000, scientists at Bell Laboratories in the USA created a semiconductor laser that was capable of producing coherent light at a wavelength of 20µm with 15 milliWatt power output. It is used in very precise chemical analysis and diagnosis for atmospheric, medical and chemical applications. By operating a range of quantum cascade semiconductor material developed at Bell Labs at temperatures of up to -191F (-124C), the scientists pushed the boundaries of what was previously possible.