An Ytterbium-doped fiber laser with dark and Q-switched pulse generation using graphene-oxide as saturable absorber

Junqing Zhao, Yonggang Wang, Peiguang Yan, Shuangchen Ruan, Yuen Hong Tsang, Gelin Zhang, Huiquan Li

Research output: Journal article publicationJournal articleAcademic researchpeer-review

40 Citations (Scopus)


We demonstrate an ytterbium-doped fiber (YDF) laser being able to generate dark pulses and Q-switched pulses by using a graphene oxide (GO) based composite as saturable absorber (SA). These operation regimes are realized for the first time in a 1-μm band fiber laser as far as our best knowledge. In the fabrication of GO based saturable absorber (GOSA), a vertical evaporation process is included, which results in a GO concentration and thickness variable SA. The generated dark pulse has pulse duration in ns-scale. In the Q-switched operation, pulses with durations from 5.321 μs to 2.655 μs and repetition rates from 28.47 kHz to 58.95 kHz can be obtained as the launched pump power is changed. The transition from the dark pulse to Q-switched operations can be clearly seen as the pump power is increased to a certain value. The radio frequency (RF) and optical spectrum variations with respect to the change of pump power have also been analyzed in detail.
Original languageEnglish
Pages (from-to)227-232
Number of pages6
JournalOptics Communications
Publication statusPublished - 1 Jan 2014


  • Dark pulse
  • Graphene oxide
  • Q-switched
  • Ytterbium-doped fiber laser

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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