Self-Starting Thulium-Doped All-Fibre Mamyshev Oscillator

Traditional solid-state ultrashort pulse sources for the 2 μm band, typically comprising Ti:Al<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf>O<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</inf> oscillators and nonlinear frequency converter, are costly, bulky, and no stable enough to satisfy the requirements of realworld applications. Robust thulium-doped fibre systems offer a compelling alternative, capable to emit ultrashort pulses with wide tuneability across the 1.65-2.2 μm band. The Mamyshev oscillator concept has recently demonstrated the potential not only to omit material saturable absorber in the cavity, which is critical for operation at longer wavelength ranges, but also substantially raise the performance of fibre laser and upscale the output powers. However, a thulium-based, self-starting all-fibre Mamyshev oscillator has not yet been realised,primarily due to the strong anomalous dispersion of silica [1].