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(a) Picture of the fiber Fabry-Pérot laser cavity using a codoped Erbium-Ytterbium fiber “sandwiched” by two highly reflective mirrors. The back mirror has been sprayed with graphene. (b) Schematic of the laser cavity.
Optical spectrum of the fiber laser (solid line). Sech2 approximation (dotted line). Gaussian approximation (dashed-dotted line). Inset: Optical spectrum at central wavelength showing a longitudinal mode spacing of approximately 0.08 nm, as expect for a laser operating at repetition rate of 9.67 GHz.
Autocorrelator trace; assuming a hyperbolic secant sech2 pulse shape the pulse duration is 865 fs.
The rf signal shows that the laser operates at a fundamental repetition rate of 9.67 GHz with a signal to noise ratio of 40 dB. The rf signal was measured with a resolution of 300 Hz.
Supercontinuum generation with a large mode spacing using the 9.67 GHz fundamental mode all-fiber laser using a graphene based saturable absorber, showing the seed laser (blue) and the generated supercontinuum.
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