READ ME File For 'Dataset title' Dataset DOI: 10.5258/SOTON/D0670 ReadMe Author: Prof Michael Zervas, University of Southampton This dataset supports the publication: AUTHORS: TITLE: Transverse-modal-instability gain in high power fiber amplifiers: effect of the perturbation relative phase' JOURNAL: APL Photonics PAPER DOI https://doi.org/10.1063/1.5050523 This dataset contains the data for the following figures: Fig. 1: Local TMI gain variation with TMI frequency (?) and signal power for phase shifts (?0) between the fundamental mode and the perturbation of (a) 0p, (b) +0.3p, and (c) -0.3p. (d) Comparison of local TMI gain at signal power Ps = 800 W. Core diameter = 60 µm and Pthr = 460 W Fig. 2: Local TMI gain variation with perturbation frequency offset (?) and relative phase shift (?0) for core radii of (a) 10 µm, (b) 20 µm, (c) 30 µm, and (d) 40 µm. Signal power Ps = 1000 W. Fig. 3: (a) Peak local TMI gain and (b) associated TMI frequency as a function of the relative perturbation phase shift (?0) for different core radii. Ps = 1000 W. Fig. 4: (a) Peak local TMI gain and (b) associated TMI frequency as a function of the perturbation relative phase shift (?0) for different signal powers. The core/cladding diameters are 80/250 µm. Nominal TMI power threshold Pthr = 265 W. Date of data collection: 29th July 2018 to 31st July 2018 Information about geographic location of data collection: University of Southampton, U.K. Related projects: EPSRC (EP/P027644/1) Royal Academy of Engineering under the Research Chairs and Senior Research Fellowships Scheme Date that the file was created: [November, 2018]