Scientists Discover New Type of Laser

Researchers at Princeton University in America have discovered an entirely new way to generate laser light. The new lasers were found after scientists working with a quantum cascade laser noticed an unexpected beam — and one that needed less power than a conventional laser beam. Quantum cascade lasers are much smaller than the solid-state lasers found in DVD players. These nanotechnology devices are a tenth as thick as a human hair and 3 millimetres long