Cladding diameters Continuous-wave mode locking 1 Fiber lasers 1 Fibers Frequency comb spectroscopies 1 Gain fibers 1 Mode-locked fiber lasers 1 Passive mode locking 1 Passive mode-locking 1 Passively mode-locked fiber lasers 1 Pumping (laser) 1 Repetition rate 1 Research areas 1 Semiconductor lasers 1 Semiconductor saturable absorber mirrors 1 Threshold reduction 1 Yb-doped fibers 1