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Virtually all practical femtosecond -pulse generation has been based on soliton formation, which is the compensation of a self-focusing nonlinear phase by anomalous dispersion. Although it has many advantageous properties, soliton like pulse -shaping also limits the stable pulse energy, and this lim it is severe in fiber lasers. Recent research has shown that it is possible to generate ultrashort...
We demonstrate a stable dual-wavelength actively mode-locked erbium-doped fiber laser operating at 20 GHz. A highly nonlinear fiber is used to compensate the frequency chirp caused by regular single-mode fiber in the optical cavity. Dual-wavelength pulse trains with pulsewidths ~1.4 ps are obtained.
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