Photonics Research, 2019, 7 (7): 07000742, Published Online: Jun. 17, 2019  

Graphene-based saturable absorber and mode-locked laser behaviors under gamma-ray radiation Download: 578次

Author Affiliations
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
Abstract
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.

Dohyun Kim, Nam Hun Park, Hyunju Lee, Jaegoan Lee, Dong-Il Yeom, Jungwon Kim. Graphene-based saturable absorber and mode-locked laser behaviors under gamma-ray radiation[J]. Photonics Research, 2019, 7(7): 07000742.

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