Abstract

We report a bidirectional mode-locked thulium-doped fiber laser. Mode-locking is enabled by the combination of semiconductor saturable absorption and nonlinear polarization rotation. Two stable mode-locked picosecond pulse trains in opposite directions are generated with a fundamental repetition rate of $\sim 16.57\mathrm{MHz}$. Output wavelengths are tunable over 35 nm.

© 2018 Optical Society of America

A stable polarization switching laser from a bidirectional passively mode-locked thulium-doped fiber oscillator

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