Abstract

We report on a passively mode-locked all-fiber laser oscillator at 1.5μm based on heavily doped phosphate-glass active fiber. An active fiber only 20cm long is sufficient to produce as much as 2.4  W of average output power directly from the oscillator. The width of the mode-locked pulses varies from 8ps at the lowest output power in the mode-locked state to 44ps at the highest power. Our picosecond laser oscillator features a high repetition rate of 95MHz and high peak pulse power of 540W. The oscillator combines the convenience of all-fiber construction with power performance that was previously achievable only with mode-locked bulk-optic laser oscillators or more complex systems involving fiber amplifiers.

© 2006 Optical Society of America

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