READ ME File For Dataset for 'Alignment-free all-fiber hollow core fiber gas cell' Dataset DOI: https://doi.org/10.5258/SOTON/D2780 ReadMe Author: Radan Slavik, University of Southampton This dataset supports the publication: Dmytro Suslov, Matěj Komanec, Thomas William Kelly, Ailing Zhong, Stanislav Zvánovec,Francesco Poletti, Natalie Wheeler and Radan Slavík Alignment-free all-fiber hollow core fiber gas cell, Optical Fiber Technology, 2023 Uploaded Archive (ZIP) includes 3 data files that are purely numerical (.xlsx) The figures are as follows: Fig. 2: Fig2_AR_Coated_MFA.xlsx Measured back-reflection of the AR-coated SMF+GRIN mode-field adapter compated to a flat surface of an uncoated mode-field adapter. Fig. 6: Fig6_Gas_cell_transmission.xlsx Measured transmission spectra of the HCF gas cell during purging with Argon. Fig.7: Fig7_Gas_cell_transmission_FP.xlsx Gas cell transmission measured at high resolution for gas cells with AR-coatings and without coating, showing parasitic Fabry-Perot resonances. Date of data collection: 01/01/2021-23/12/2022 Information about geographic location of data collection: Optoelectronics Research Center, UK. Czech Technical University in Prague, Czech Republic Licence: Open Access Publishing Agreement. Related projects: GACR project 22-32180S, International Mobility of Researchers in CTU project number CZ.02.2.69/0.0/0.0/18_053/0016980, EPSRC project “Airguide Photonics” under grant EP/P030181/1, EU ERC (grant 682724), Royal Academy of Engineering Date that the file was created: 10 September, 2023