Abstract
This paper reports a Yb-doped mode-locked femtosecond fiber laser based on a nonlinear amplifying loop mirror (NALM). The improved NALM structure ensures the high repetition rate of 97 MHz and the maximum output power of 126 mW. The Gires-Tournois interferometers (GTI) are used as dispersion compensation devices in laser resonator. The pulse output with full width half maximum (FWHM) of 26 nm and a dechirped pulse duration of 90 fs is obtained. As far as we know, this is the relatively short pulse in an improved NALM mode-locked Yb-doped fiber laser.
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