Graphene capacitor-based electrical switching of mode-locking in all-fiberized femtosecond lasers
- Graphene capacitor-based electrical switching of mode-locking in all-fiberized femtosecond lasers
- 송용원; 시암 우딘; 올렉시 코발척; 이성재
- grpahene cacacitor; saturable absorber; mode-locking; electrical switching; reversible pulse switching; graphene Fermi level shift
- Issue Date
- ACS Applied Materials & Interfaces
- VOL 12, NO 48-54011
- Effective high-capacity data management necessitates the use of ultrafast fiber lasers with mode-locking-based femtosecond pulse generation. We suggest a simple but highly efficient structure of a graphene saturable absorber in the form of a graphene/poly(methyl methacrylate) (PMMA)/graphene capacitor and demonstrate the generation of ultrashort pulses by passive mode-locking in a fiber ring laser cavity, with simultaneous electrical switching (on/off) of the mode-locking operation. The voltage applied to the capacitor shifts the Fermi level of the graphene layers, thereby controlling their nonlinear light absorption, which is directly correlated with mode-locking. The flexible PMMA layer used for graphene transfer also acts as a dielectric layer to realize a very simple but effective capacitor structure. By employing the graphene capacitor on the polished surface of a D-shaped fiber, we demonstrate the switching of the mode-locking operation reversibly from the femtosecond pulse regime to a continuous wave regime of the ring laser with an extinction ratio of 70.4 dB.
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