Mode-locked fiber lasers emitting in the wavelength range beyond 2 μm [1] are promising for a number of applications including environmental sensing, material processing, medicine etc. Mode-locked holmium fiber lasers tend to operate below 2.1 μm wavelength. For some applications it is important to shift the laser wavelength further to the infrared. Previous demonstration of a 2107-nm mode-locked Ho-fiber laser used Tm-fiber laser pumping and graphene-based saturable absorber. Here we report the longest-wavelength operation of a mode-locked holmium fiber laser, realized in a compact diode-pumped setup.

© 2017 IEEE

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