Widely Wavelength-Tunable Single-Longitudinal-Mode Thulium-Doped Fiber Laser Incorporating a Saturable Absorber

Abstract

We demonstrate 1870nm to 2051nm continuous wavelength-tuning in a thulium-doped fiber ring laser, using a Fabry-Perot tunable filter. By employing a saturable-absorption-induced grating filter, stable single-longitudinal-mode lasing is achieved in a range from 1920nm to 2020nm.