Abstract

We demonstrate that few-layered graphene sheets used as a saturable absorber can provide efficient $Q$-switching and mode-locking modulation in 1.34 μm $\mathrm{Nd}\text{:}{\mathrm{GdVO}}_4$ bulk lasers. The minimum $Q$-switched pulses were 450 ns for 260 mW average power, 43 kHz repetition rate, and 2.5 μJ pulse energy. For the mode-locked laser, an average power of 1.29 W was achieved with 11 ps pulse duration and 13 nJ pulse energy. To our knowledge, this average power is the highest yet obtained from a graphene mode-locked laser, and the corresponding optical—optical efficiency of 23% is the best result among 1.3 μm neodymium mode-locked lasers. The quality factor $M^2$ of the $Q$-switched beam was 1.4 and 1.6 in the horizontal and longitudinal planes, respectively, and the $M^2$ of the mode-locked beam reached 1.1 and 1.0. These results clearly indicate the advantages of few-layered graphene as a saturable absorber.

©2012 Optical Society of America

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