Researchers at Imperial College London have created what they describe as artificial fog. This so-called man-made fog can scatter high-brightness lasers at low power. The team believes the discovery could eventually replace the light bulb because of the scattered light characteristics of the artificial fog.
One of the key aspects is that this fog can produce high brightness with low power requirements. Light bulbs based on new laser systems will be more energy efficient than regular bulbs or LED bulbs. The diffuser created by the team allows the laser to scatter over a larger area. The team was also able to adjust the light to different colors, including white. White has always been a hard-to-achieve color using lasers. The previous white light of the laser diode was generated by shining the laser onto the phosphor material. The problem is that the process is inefficient and produces only one color of light.
The team used ultra-thin materials associated with graphene to produce white light by shining red, blue and green lasers onto diffusers made of boron hexagon itnate material. The diffuser developed by the team, called aero-BN, consists of a translucent material consisting of randomly arranged and interconnected hexagonal boron nitride hollow microtubes.
The material consists of 99.99% of the air. White light generated by three different lasers is used deep into the diffuser, where they are strongly and randomly scattered multiple times by the nanotube walls of the microtubes. The team says the diffuser, like an artificial fog, makes the diffuser more diffuse, emitting white light at the optimum intensity of all three lasers. By changing the intensity ratio of three different colors of the laser, you can get the color of the entire palette.