Comparison of Different Mode-Locking Methods in the Ho-Doped Fiber Laser

Ultrafast fiber sources operating in the spectral range of 2–3 μm have attracted attention due to a number of possible applications, e.g. for perspective communications, gas sensing, nonlinear frequency conversion, and medicine. Holmium-doped fibers (HDF) are commonly used as a gain medium for 2 μm lasers due to their broad gain spectrum, extending from 2 to 2.2 μm.