Abstract

High-quality graphene sheets with lateral size over 20μm have been obtained by bath sonicating after subjecting the wormlike graphite marginally to mixed oxidizer. To date, to our knowledge, they are the largest graphene sheets prepared by exfoliation in the liquid phase. A saturable absorber mirror was fabricated based on these sheets. We exploited it to realize mode-locking operation in a diode-pumped Nd:GdVO4 laser. A pulse duration of 16ps was produced with an average power of 360mW and a highest pulse energy of 8.4nJ for a graphene mode-locked laser.

© 2011 Optical Society of America

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