Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/24838
Title: An Ytterbium-doped fiber laser with dark and Q-switched pulse generation using graphene-oxide as saturable absorber
Authors: Zhao, J
Wang, Y
Yan, P
Ruan, S
Tsang, Y 
Zhang, G
Li, H
Issue Date: 2014
Source: Optics communications, 2014, v. 312, p. 227-232
Abstract: 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.
Keywords: Dark pulse
Graphene oxide
Q-switched
Ytterbium-doped fiber laser
Publisher: Elsevier
Journal: Optics communications 
ISSN: 0030-4018
EISSN: 1873-0310
DOI: 10.1016/j.optcom.2013.09.038
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