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

© 2008 Optical Society of America

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