READ ME File For 'Flexible Mid-IR fiber bundle for thermal imaging of inaccessible areas' Dataset DOI: 10.5258/SOTON/D0823 ReadMe Author: Andrea Ventura, University of Southampton This dataset supports the publication: Andrea Ventura, Fedia Ben Slimen, Joris Lousteau, Nicholas White, Ali Masoudi, Petr Janicek, and Francesco Poletti Flexible Mid-IR fiber bundle for thermal imaging of inaccessible areas Optics Express This dataset contains the data supporting the paper. The figures are as follows: Fig. 1. (a) Refractive index of Vitron IG3 chalcogenide glass provided by Vitron [15] (blue curve) and of the FEP polymer (green curve) measured by the J.A. Woollam Co IR-VASE spectroscopic ellipsometer. (b) The blue curve represents Vitron IG3 glass loss measured on an uncladded fiber of 240 µm of diameter for ? between 3 and 5.4 µm combined with the loss measured on a fiber of 700 µm for ? between 5.4 and 11.5 µm. The inset shows the fiber transmission in dB at 4 µm in wavelength measured at different fiber lengths. The green curve represents the FEP polymer loss measured on a sample 0.86 mm thick for ? between 3 and 7.3 µm and on a sample 0.05 mm thick for ? between 7.3 and 11.5 µm. The dotted vertical line represents the delimitation between the FEP loss measurement on the 0.86 and 0.05 mm thick samples. Fig. 4 Average attenuation of fiber bundles of 22 µm (dashed curve) and 13 µm (dashed-dotted curve) of core diameter and attenuation of the Vitron IG3 chalcogenide glass (green curve). The orange curve represents the additional loss due to the polymer cladding. The black curve represents the expected fiber bundle loss. Fig. 9. Intensity distribution at the output of the fiber bundle 62.5 cm long (1.1 mm outer diameter) by exciting several cores (blue curve) and a single core (green curve). Inset shows perpendicular cut of single pixel excited fiber (right upper corner – green) and excitation of single pixel with 6 nearest neighbors (left upper corner – blue). Fig. 10. Attenuation calculated by using the procedure explained in the Appendix for core diameter of 13 (solid magenta curve), 22 (solid green curve), 40 (solid black curve), 80 (solid red curve) and 100 µm (solid blue curve). The dashed curves represent the attenuation simulated of the fundamental mode. The brown curve represents the IG3 loss. The grey hashed bar represents the spectral region where the FEP polymer loss were too high to be measured. Fig. 11 Fraction of power in the cladding of the bundle of 13 µm calculated from measurement (green curve). Fraction of power in the cladding of the fundamental mode simulated on a fiber with core of 13 µm (black squares) and its fit (blue curve). Estimated fraction of power in the cladding (dashed red curve). Date of data collection: from December 2016 to February 2019 Information about geographic location of data collection: University of Southampton, U.K. Licence: Date that the file was created: February, 2019