Debnath, Pulak C. Park, Jaehyun Scott, Austin M. Lee, Junsu Lee, Ju Han Song, Yong-Won 2024-01-20T06:04:25Z 2024-01-20T06:04:25Z 2022-01-10 2015-09 2195-1071 https://pubs.kist.re.kr/handle/201004/125046 Despite auspicious optical properties of graphene, particularly its ability to absorb light over a broad wavelength range, incorporating presynthesized graphene in optical system by recognized transfer methods has critical drawbacks of introducing impurities and damaging the graphene film which can affect the performance of optical system. Here a transfer-free, in situ synthesis of multilayered graphene is demonstrated directly onto single-mode optical fiber end facet and polished surface of D-shaped fiber by interfacial growth process in ambient condition. Conventional telecommunication lasers operating at approximate to 1550 nm band are employed to provide the activation energy for carbon atoms to diffuse, precipitate through Ni-catalyst layer, and form the graphene crystals at the interface of metal catalyst and optical fiber. The in situ grown graphene on optical fiber acts as saturable absorber in the fiber laser ring cavity to generate ultrafast optical pulses by mode-locking technique. The formation and the quality of the resulting multilayered graphene are confirmed by precision analysis tools. The synthesized graphene has the sp(2)-bond shares of 75.8% and it shows nonlinear optical absorption property with the modulation depth of 7%, guaranteeing passive mode-locking of fiber laser operating in femtosecond scale. English WILEY-V C H VERLAG GMBH LARGE-AREA ULTRAFAST PHOTONICS EPITAXIAL GRAPHENE SATURABLE ABSORBER BILAYER GRAPHENE ROOM-TEMPERATURE PULSE GENERATION LAYER GRAPHENE DIRECT GROWTH CARBON In Situ Synthesis of Graphene with Telecommunication Lasers for Nonlinear Optical Devices Article 10.1002/adom.201500104 1 ADVANCED OPTICAL MATERIALS, v.3, no.9, pp.1264 - 1272 ADVANCED OPTICAL MATERIALS 3 9 1264 1272 scie scopus 000362524300016 2-s2.0-84941744721 Materials Science, Multidisciplinary Optics Materials Science Optics Article LARGE-AREA ULTRAFAST PHOTONICS EPITAXIAL GRAPHENE SATURABLE ABSORBER BILAYER GRAPHENE ROOM-TEMPERATURE PULSE GENERATION LAYER GRAPHENE DIRECT GROWTH CARBON Fibers Graphene In situ synthesis Lasers Optical nonlinearity Saturable absorbers