Ultrashort pulse
英[ˈʌltrəˈʃɔ:t pʌls]美[ˌʌltrəˈʃɔrt pʌls]
In optics, an ultrashort pulse of light is an electromagnetic pulse whose time duration is of the order of a femtosecond (10?15 second) or less. Such pulses have a broadband optical spectrum, and can be created by mode-locked oscillators.