The physical interaction between two or more systems, also known as coupling, can give rise to unique and unexpected effects.

B1a). The process is very different from light emission in a fluorescent or incandescent lamp, which occurs by spontaneous emission — a process in which materials emit light that can have almost ...

LEDs (light emitting diodes) convert an electrical current into light using spontaneous emission in optically active semiconductors. Lasers add a mechanism for optical feedback, such as mirrors ...