1.7-μm gain-switched thulium-doped fiber laser with electrically tuning and its application to spectroscopic photoacoustic imaging

We demonstrate a gain-switched thulium-doped fiber laser with electrically wavelength tuning in the 1.7-μm band. The achieved stable laser pulses with an energy of 1.6 μJ are exploited to implement spectroscopic photoacoustic microscopy of lipid.