Here you were, thinking it was an average Friday. Then BOOM! You read that lasers have completely inverted, becoming "non-light" as opposed to piercing bolts of laser-light.
These dark pulse lasers are formed of minuscule quantum dot crystals, with the crystals turning into light once an electrical current hits them. Each crystal dot thinks it's an individual atom and then projects dark light at the same frequency.
The beams of light are shorter but more stable than the usual sort of lasers, apparently, with the research team claiming that this is because "quantum dots are known for [their]unusual behaviour". Once they emit light, the dots suddenly regain their energy at varying points of extreme quickness.
The process is explained like so:
"The new laser depends on the qdots' unusual energy dynamics, which have the effect of stabilizing dark pulses. After emitting light, qdots recover energy from within rapidly (in about 1 picosecond) but more slowly (in about 200 picoseconds) from energy inputs originating outside the qdots in the laser cavity. This creates a progression of overall energy gains gradually giving way to overall energy losses. Eventually, the laser reaches a steady state of repeated brief intensity dips-a drop of about 70 percent-from the continuous light background."
It's pretty complex stuff, but the US National Institute of Standards and Technology, who are working on the research, sees great potential in the dark lasers for "optical atomic ultraclocks and/or superpowered networking and comms kits" in the near future. [Optics Express via The Reg via DVICE]