This dataset includes relevant data and figures associated with the manuscript "Highly efficient, depressed-cladding thulium-doped fiber laser at 1762 nm ". All relevant data are in xlsx formats. Data files are labeled according to the corresponding figure in the manuscript (e.g., sheet Fig 1 contains the data used to generate the plots in Figure 1). The dataset is organized in 10 sheets, each of which is named after a Figure in the manuscript. Only figures reporting experimental results are included in the dataset. The labels of the axes and the units are indicated in the headers of individual columns of each sheet. Full context and detailed analysis of the provided raw and processed Data can be found in the manuscript.