Abstract

We report >13  MHz/mW pump power efficiency in increasing the repetition rate of passive harmonic mode-locking by engineering the soliton pulse energy in Er fiber lasers incorporating carbon nanotube saturable absorber. Stable pulses with a ∼5  GHz repetition rate and 40 dB of super-mode suppression are demonstrated with only ∼400  mW pump power in a single-clad fiber laser.

©2012 Optical Society of America

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