Abstract
We demonstrate a passive mode-locked Er:Yb doped double-clad ring fiber laser based on graphene saturable absorber. By adjusting the polarization controller and minimizing the cavity loss, the laser can operate at hundreds of harmonics of the fundamental repetition frequency of the resonator with the central wavelength of 1.61 μm. Up to 683rd harmonic (which corresponds to 5.882 GHz) of the fundamental repetition frequency was achieved.
Highlights
High repetition rates ultrashort pulses are very important since they can be utilized to high bit rate optical communication [1], arbitrary wave form generation [2] and biological imaging [3], etc
We demonstrate a passive mode-locked Er:Yb doped double-clad ring fiber laser based on graphene saturable absorber
By adjusting the polarization controller and minimizing the cavity loss, the laser can operate at hundreds of harmonics of the fundamental repetition frequency of the resonator with the central wavelength of 1.61 μm
Summary
High repetition rates ultrashort pulses are very important since they can be utilized to high bit rate optical communication [1], arbitrary wave form generation [2] and biological imaging [3], etc. In net negative dispersion fiber laser (β2 < 0), when the pump power increases beyond a certain value, multipulses will form in the cavity because of the energy quantization effect [4] Under certain conditions they can self-arrange to create a stable and well-organized pulse train with repetition rates far beyond the fundamental cavity frequency (free spectral range of the cavity) [5]. This technology is an efficient method to get high repetition rates ultrashort pulses, and is called high-order passive harmonic mode-locking (HML). Note that all the above researches are focused on C-band (1530–1565 nm)
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