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Atomic layer graphene as saturable absorber for ultrafast pulsed lasers

Authors
  • Bao, Qiaoliang
  • Zhang, Han
  • Wang, Yu
  • Ni, Zhenhua
  • Yan, Yongli
  • Shen, Ze Xiang
  • Loh, Kian Ping
  • Tang, Ding Yuan
Type
Preprint
Publication Date
Oct 30, 2009
Submission Date
Oct 30, 2009
Identifiers
arXiv ID: 0910.5820
Source
arXiv
License
Yellow
External links

Abstract

The optical conductance of monolayer graphene is defined solely by the fine structure constant. 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 due to Pauli blocking. Here, we demonstrate the 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. The modulation depth can be tuned in a wide range from 66.5% to 6.2% by varying the thickness of graphene. Our 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 tuneability.

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