Abstract
Synchronously mode-locked lasers produce pulses whose spectrum and temporal profile appear smooth on average, but in fact exhibit strong fluctuations in shape, width and peak intensity. This has been shown to result from low levels of background noise in the cavity originating from spontaneous emission of the laser active material. Regarding the autocorrelation trace of a mode-locked pulse, this background noise can cause a strong coherence peak and pronounced wings, and leads to a significant high frequency component in the pulse energy fluctuations.
© 1994 Optical Society of America
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