Low-repetition-rate, all-polarization-maintaining Yb-doped fiber laser mode-locked by a semiconductor saturable absorber
Output of the oscillator with 1.66 MHz repetition rate. (a) Spectrum measured by OSA with 0.06 nm bandwidth resolution, (b) pulse train, and (c) one pulse measured by a fast photo-detector with rise time of 100 ps and an oscilloscope with 2 GHz bandwidth.
