In recent years, the popular thulium-doped fiber lasers (TDFL) are expanding their operational wavelength coverage through accessing the 1.7-μm region, where they have previously been hindered by the quasi-three-level nature of TDF emission, which leads to strong re-absorption of short wavelength light . This was driven by a plenty of applications such as deep bio-imaging, spectroscopic analysis and material processing that takes advantages of the third near-infrared (NIR3) optical window (1600–1870 nm) for bioimaging and abundant molecular absorptions in this spectral region . At present, short wavelength TDFLs have been demonstrated to operate in the continues-wave (CW), soliton mode-locking and gain-switching regimes [4-6]. Here we report a TDFL that demonstrates dissipative soliton resonance (DSR) at 1750 nm with a maximum single pulse energy of 321.2 nJ.
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