We demonstrate a high-energy and high-average power Mamyshev oscillator based on a high performance largemode-area step-index germanosilicate-cladding Yb-doped fiber. The oscillation of higher-order modes is effectively suppressed by employing appropriate intracavity spatial mode filtering, allowing significant scaling of single pulse energy. The laser directly generates a nearly diffraction-limited beam with an average power of 17 W operating at the fundamental repetition rate of 14.01 MHz, corresponding to a pulse energy of 1.2 µJ. The pulses could be externally dechirped to ~58 fs, leading to a peak power of ~13 MW. To the best of our knowledge, this is the highest pulse energy with sub-100 fs duration ever obtained directly from a modelocked fiber oscillator.
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