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Ultrafast Optics
Laser-driven self-exfoliation of graphene oxide layers on a fiber facet for
Q
switching of an Er-doped fiber laser at the longest wavelength
Download:665次
Byungjoo Kim
1
Seongjin Hong
1
Jaedeok Park
2
Yongsoo Lee
1
[ ... ]
Kyunghwan Oh
1,*
Author Affiliations
Abstract
1
Photonic Device Physics Laboratory, Institute of Physics and Applied Physics, Yonsei University, Seoul 03722, South Korea
2
Department of Physics and Energy Systems Research, Ajou University, Suwon 16499, South Korea
A new method to make an all-fiber nonlinear optic device for laser pulse generation is developed by depositing multi-layer graphene oxide (GO) selectively onto the core of the cleaved fiber facet by combining the electrical arc discharge and the laser-driven self-exfoliation. Using the GO colloid droplet with sub-nanoliter volume, we obtained a GO bulk layer deposited on a fiber facet of the order of milliseconds by using an electric arc. The prepared fiber facet was then included in an Er-doped fiber laser (EDFL) cavity and we obtained a few layers of GO having nonlinear optic two-dimensional (2D) characteristics selectively on the fiber core by the laser-driven self-exfoliation. The 2D GO layers on the fiber core served as a stable and efficient saturable absorber enabling robust pulse train generation at
λ
=
1600.5
nm
, the longest
Q
-switched laser wavelength in EDFLs. Pulse characteristics were analyzed as we varied the pump power at
λ
=
980
nm
from 105.2 mW to 193.6 mW, to obtain the maximum repetition rate of 17.8 kHz and the maximum output power of 2.3 mW with the minimum pulse duration of 7.8 μs. The proposed method could be further applied to other novel inorganic 2D materials opening a window to explore their novel nonlinear optic laser applications.
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Photonics Research
2020, 8(8): 08001324
Lasers and Laser Optics
Graphene-based saturable absorber and mode-locked laser behaviors under gamma-ray radiation
Download:584次
Dohyun Kim
1
Nam Hun Park
2
Hyunju Lee
2
Jaegoan Lee
1
[ ... ]
Jungwon Kim
1,*
Author Affiliations
Abstract
1
School of Mechanical and Aerospace Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, South Korea
2
Department of Energy Systems Research & Department of Physics, Ajou University, Suwon 16499, South Korea
3
e-mail: diyeom@ajou.ac.kr
We investigate optical and electrical behaviors of a graphene saturable absorber (SA) and mode-locking performance of a graphene-SA-based mode-locked Er fiber laser in gamma-ray radiation. When irradiated up to 4.8 kGy at
~
100
Gy
/
hr
dose rate, the overall nonlinear transmittance in transverse electric mode was increased, while maintaining modulation depth to
>
10
%
. The corresponding polarization-dependent loss was reduced at a 1.2-dB/kGy rate. In the electrical properties, the charge carrier mobility was reduced, and the Dirac voltage shift was increased to positive under gamma-ray radiation. The radiation-induced optical and electrical changes turned out to be almost recovered after a few days. In addition, we confirmed that the graphene-SA-based laser showed stable CW mode-locking operation while the inserted graphene SA was irradiated for 2-kGy at a 45-Gy/hr dose rate, which corresponds to
>
40
years of operation in low Earth orbit satellites. To the best of our knowledge, this is the first evaluation of graphene SAs and graphene-SA-based mode-locked lasers in gamma-ray radiation, and the measured results confirm the high potential of graphene SAs and graphene-SA-based lasers in various outer-space environments as well as other radiation environments, including particle accelerators and radiation-based medical instruments.
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Photonics Research
2019, 7(7): 07000742
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