A single-mode, transform-limited, actively Q-switched distributed-feedback fiber laser is presented, based on a new in-line acoustic pulse generator. Our technique permits a continuous adjustment of the repetition rate that modulates the Q factor of the cavity. Optical pulses of peak power, temporal width, and up to repetition rates were obtained. The measured linewidth demonstrates that these pulses are transform limited: for a train of pulses of repetition rate, temporal width, and peak power. Efficient excitation of spontaneous Brillouin scattering is demonstrated.
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