77-FS PULSE GENERATION FROM A STRETCHED-PULSE MODE-LOCKED ALL-FIBER RING LASER

By incorporating a section of large positive-dispersion fiber in an al l-fiber erbium ring laser, we obtain high-energy pulses with spectral widths of 56 nm. The chirp on these pulses is highly linear and can be compensated for with dispersion in the output coupling fiber lead. Th e result is a fully self-starting source of 77-fs pulse with 90 pJ of energy and greater than 1 kW of peak power at a 45-MHz repetition rate .