Abstract

In this Letter, we report a dispersion-compensation-free ultrafast thulium-doped all-fiber laser based on nonlinear polarization evolution (NPE) mode locking, delivering 330 fs soliton pulses at 1950 nm. A multifunctional hybrid fiberized device was applied in the oscillator to minimize the physical cavity length to 80  cm with a total dispersion of 0.045  ps2, enabling a state-of-the-art fundamental mode-locking repetition rate of 248 MHz in an NPE-based oscillator at 2  μm.

© 2016 Optical Society of America

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