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Title: Atomic-layer craphene as a saturable absorber for ultrafast pulsed lasers
Authors: Bao, Q. 
Zhang, H.
Wang, Y. 
Ni, Z.
Yan, Y. 
Shen, Z.X.
Loh, K.P. 
Tang, D.Y.
Issue Date: 9-Oct-2009
Citation: Bao, Q., Zhang, H., Wang, Y., Ni, Z., Yan, Y., Shen, Z.X., Loh, K.P., Tang, D.Y. (2009-10-09). Atomic-layer craphene as a saturable absorber for ultrafast pulsed lasers. Advanced Functional Materials 19 (19) : 3077-3083. ScholarBank@NUS Repository.
Abstract: The optical conductance of monolayer graphene is defined solely by the fine structure constant, α= e2/hc (where e is the electron charge, h is Dirac's constant and c is the speed of light). The absorbance has been predicted to be independent of frequency. In principle, the interband optical absorption in zero-gap graphene could be saturated readily under strong excitation dueto Pauli blocking. Here, use of atomic layer graphene as saturable absorber in a mode-locked fiber laser for the generation of ultrashort soliton pulses (756 fs) at the telecommunication band is demonstrated. The modulation depth can be tuned in a wide range from 66.5% to 6.2% by varying the graphene thickness. These results suggest that ultrathin graphene films are potentially useful as optical elements in fiber lasers. Graphene as a laser mode locker can have many merits such as lower saturation intensity, ultrafast recovery time, tunable modulation depth, and wideband tunability. © 2009 WILEY-VCH Verlag GmbH & Co. KGaA.
Source Title: Advanced Functional Materials
ISSN: 1616301X
DOI: 10.1002/adfm.200901007
Appears in Collections:Staff Publications

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