All-fiber widely tunable 2 μm fiber laser

We report on the development of an all-fiber, 793-nm cladding-pumped tunable Tm-doped fiber laser based on a voltage driven 2-mu m, intra-cavity, fiber-coupled, Fabry-Perot tunable filter. Continuous tuning over a 90-nm range has been achieved from 1952 to 2042 nm with a spectral linewidth <= 0.07 nm and an optical signal-to-noise ratio >55 dB. A wavelength stability of +/- 0.01 nm over a run time of 2 hours has been demonstrated. The desired wavelength from the available 90 nm of tuning range can be selected by the filter with a kHz repetition rate.