READ ME File For Data for Tunable Holmium-doped Fiber Laser with Multi-watt Operation from 2025 nm to 2200 nm paper Dataset DOI: 10.5258/SOTON/D0987 ReadMe Author: William Clarkson, University of Southampton This dataset supports the publication: AUTHORS: William Clarkson, Lars Gronmark Holmen and Peter Shardlow TITLE: Tunable Holmium-doped Fiber Laser with Multi-watt Operation from 2025 nm to 2200 nm JOURNAL: Optics Letters PAPER DOI https://doi.org/10.1364/OL.44.004131 The figures are as follows: Fig. 2. Maximum output power (black) and the degree of unidirectionality (blue) measured at different wavelengths. The pump laser power was 42 W. Fig. 3. Normalized optical spectra (2 nm resolution). Fig. 4. Optical spectrum at 2200 nm measured with a 0.05 nm resolution. The inset shows the beam profile. Fig. 5. Power curve measured at 2200 nm, showing the combined and separate contributions of forward power from the output coupler (PM1 in Fig. 1) and nondiffracted light leaking through the grating (PM2). The laser power circulating in the reverse direction as measured with PM3 is also shown. Fig. 6. Slope efficiency (black) and threshold (blue) of the laser across the tuning range, both measured with respect to absorbed pump power. Date of data collection: 2018-2019 Information about geographic location of data collection: University of Southampton, U.K. Licence: CC BY Related projects: Seventh Framework Programme (287732). Date that the file was created: June, 2019