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Direct generation of ultrashort, transform-limited pulses in a laserresonator is observed theoretically and experimentally. This constitutes a newtype of ultrashort pulse generation in mode-locked lasers: in contrast to thewell-known solitons (hyperbolic secant like), dispersion-managed solitons(Gaussian-like), and parabolic pulses plus external compression, ultrashortpulse solutions to the nonlinear wave equations that describe pulse evolutionin the laser cavity are observed. Stable ultrashort, transform-limited pulsesexist with optical spectrum broader than the gain bandwidth of the amplifier,and this has practical application for other lasers.

Direct ultrashort pulse generation by intracavity nonlinear compression