835 MHz SESAM burnt-free mode locked femtosecond Er-doped fiber oscillator

We demonstrated a fundamentally semiconductor saturable absorber mirror (SESAM) mode-locked fiber oscillator with a repetition rate up to 835 MHz at a central wavelength of 1572.3 nm. The average power of the output pulse is 6.02 mW, corresponding to a pulse energy of 7.2 pJ with an 150 mW incident pump power. Due to the intracavity anomalous dispersion, the laser is operating at soliton mode-locked regime with a spectral bandwidth of 12.7 nm and a pulse duration of 374 fs. Furthermore, with such high repetition rate, the mode-locked pulse maintains a clean pulse quality with a noise suppression of more than 75dB. The mode-locked fiber oscillator is compact, SESAM burnt-free and robust with an all-fiber configuration.