Abstract
Ultrafast pulse generation was demonstrated in a thulium-doped fiber laser mode-locked by magnetron-sputtering deposited with a modulation depth, a nonsaturable loss, and a saturable intensity of 31%, 34.3%, and , respectively. Stable soliton pulses could be obtained at a 1915.5 nm central wavelength with a pulse duration of 1.25 ps, an average output power of 39.9 mW, and a signal-to-noise ratio of 95 dB. To the best of our knowledge, this was the first demonstration of -based saturable absorbers in fiber lasers at a 2 μm regime.
© 2017 Optical Society of America
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