Broadly tunable sub-500 fs pulses from an additive-pulse mode-locked thulium-doped fiber ring laser

Abstract
We report an additive-pulse mode-locked (APM) thulium-doped fiber ring laser producing 350–500 fs pulses tunable from 1798 to 1902 nm. The laser operates in the soliton regime, where periodic perturbations cause predictable sidebands and modulation in the optical spectrum.

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