Toward higher-order passive harmonic mode-locking of a soliton fiber laser

Abstract

We report $>13\mathrm{MHz}/\mathrm{mW}$ 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 $\sim 5\mathrm{GHz}$ repetition rate and 40 dB of super-mode suppression are demonstrated with only $\sim 400\mathrm{mW}$ pump power in a single-clad fiber laser.

© 2012 Optical Society of America

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