Abstract
High-quality graphene sheets with lateral size over 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 laser. A pulse duration of was produced with an average power of and a highest pulse energy of for a graphene mode-locked laser.
© 2011 Optical Society of America
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