Most lasers emit just one wavelength, or color. To deflect missiles, the researchers are employing what are known as mid-infrared supercontinuum lasers, or MISCLs, that give off a much broader range of wavelengths—from the visible (800 nanometers) to the mid-infrared (4.5-microns). (A nanometer is one billionth of a meter; A micron is one millionth of a meter.) Because these lasers emit such a broad spectrum, they inundate the opposing sensors with all the infrared wavelengths the missile might look for; any attempts by opponents to block these dazzling rays by painting reflective or absorptive coatings on the missile beforehand would also blind its sensors to the same wavelengths from the copter engine.
