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A mode-locked laser is capable of emitting extremely short pulses on the order of tens of picoseconds down to less than 10 femtoseconds. These pulses will repeat at the round trip time, that is, the time that it takes light to complete one round trip between the mirrors comprising the resonator.
A repeating pulse represented graphically as on an oscilloscope. In music and music theory, the pulse consists of beats in a (repeating) series of identical yet distinct periodic short-duration stimuli perceived as points in time occurring at the mensural level.