1867–2010 nm tunable femtosecond thulium-doped all-fiber laser
2017
We propose and demonstrate a broadly wavelength tunable mode-locked thulium-doped all-fiber laser, delivering sub-400 femtosecond (fs) pulses and tuning from 1867 nm to 2010 nm. The tunable range of 143 nm, to our best knowledge, is the widest in the femtosecond mode-locked thulium-doped fiber lasers (TDFLs). The broadly tunable range and femtosecond pulse oscillation attribute to the large free spectral range and bandwidth of the fiber-based Lyot filter, benefiting from the hybrid device based compact configuration. The hybrid device, integrating wavelength-division-multiplexer, polarization-sensitive isolator and output coupler, effectively diminishes the birefringence and net dispersion.
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