Nonlinearly Pulsed Fiber Lasers Incorporating Graphene Efficiently Synthesized by Intensely Pulsed White Light
- Nonlinearly Pulsed Fiber Lasers Incorporating Graphene Efficiently Synthesized by Intensely Pulsed White Light
- 김원준; 이준수; 이주한; 임정아; 임대순; 최원국; 송용원
- graphene; fiber laser; mode-locking; IPL; nonlinearity
- Issue Date
- European Materials Research Society (E-MRS) 2014 Spring Meeting
- Overcoming the drawbacks given by conventional methods, we designed and demonstrated a highly efficient synthesis of graphene employing intensely pulsed white light (IPWL) that photoinduces depth-controlled heating rapidly to avoid the substrate damage. The approach provided the synthesis at the interface of Ni-catalyst layer and the substrate, thereby forming the graphene layer directly on a targeted substrate after etching the catalyst without deleterious transfer process. Moreover, since the carbon atoms can be supplied from polymer layer and/or impurities hosted into the catalyst, any external carbon source was not required.
In realizing a nonlinear saturable absorber that functioned as mode-locker to form short laser pulses, graphene synthesized by IPWL was incorporated in a fiber-optic component. Ni-catalyst of 50 nm was deposited onto the end surface of a fiber ferrule, and IPWL was irradiated during <60 s with the fluence of ~ 30 J/cm2 under ambient condition. After etching out the catalyst layer, the crystallinity of graphene was checked by Raman. The graphene deposited ferrule was sandwiched by an additional one for laser-graphene interaction. By managing the intracavity power level, chromatic dispersion, and polarization state, we successfully obtained short pulse laser output that has operating center wavelength, repetition rate, and estimated pulse duration of 1571.7 nm, 14.03 MHz, and 3.4 ps, respectively. Higher harmonic pulsation was also achieved.
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