400 mW narrow-linewidth Tm-doped silica fiber laser output near 1750nm with volume Bragg grating

摘要

A type of Tm-doped silica fiber laser with narrow-linewidth and output wavelength near 1750?nm was firstly presented, by using a 1550?nm Er-doped fiber laser pump source and a volume Bragg grating (VBG). By means of a 15?cm Tm-doped fiber, a 400?mW continuous wave (cw) at ~1750?nm with FWHW of ~54?pm was generated, corresponding to an average slope efficiency up to 23.5% with respect to absorbed pump power. The influence of gain fiber length on the spectrum wavelength has been investigated in detail. All experimental results demonstrate that this fiber laser will be an effective and promising pump source for mid-IR laser output.