External-cavity mode-locked quantum-dot lasers for low repetition rate, sub-picosecond pulse generation

External-cavity mode-locking of a quantum-dot laser is demonstrated with record-low repetition-rates of 310 MHz, and harmonic repetition-rates up to 4 GHz. Fourier-limited 930 fs pulse generation is achieved. The pulse-energy of ~0.45 pJ is independent of operating conditions.

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