Abstract

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 $800\mathrm{mW}$ peak power, $32\mathrm{ns}$ temporal width, and up to $20\mathrm{kHz}$ repetition rates were obtained. The measured linewidth demonstrates that these pulses are transform limited: $6\mathrm{MHz}$ for a train of pulses of $10\mathrm{kHz}$ repetition rate, $80\mathrm{ns}$ temporal width, and $60\mathrm{mW}$ peak power. Efficient excitation of spontaneous Brillouin scattering is demonstrated.

© 2008 Optical Society of America

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