READ ME File For Dataset 'Controlled generation of picosecond-pulsed higher-order Poincaré sphere beams from an ytterbium-doped multicore fiber amplifier' Dataset DOI: 10.5258/SOTON/D2459 Date that the file was created: Nov,2022 ------------------- GENERAL INFORMATION ------------------- ReadMe Author: Kunhao Ji, University of Southampton [ORCID ID:https://orcid.org/0000-0002-2300-5942] Date of data collection: from Sep 2021 to Jan 2022 Information about geographic location of data collection: University of Southampton, U.K. Related projects: AirGuide Photonics, EPSRC(EP/P030181/1) National Hub in High Value Photonic Manufacturing, EPSRC(EP/N00762X/1) Laser Technologies for Future Manufacturing, EPSRC(EP/P027644/1) Self-organization of light in multicore optical fibres: a route to scalable high-power lasers and all-optical signal processing, EPSRC(EP/T019441/1) Multimode light shaping: from optical fibers to nanodevices, Horizon 2020 ERC (No. 802682) -------------------------- SHARING/ACCESS INFORMATION -------------------------- Licenses/restrictions placed on the data, or limitations of reuse:CC-BY Recommended citation for the data: This dataset supports the publication: AUTHORS:Kunhao Ji, Di Lin, Ian Davidson, Siyi Wang, Joel Carpenter, Yoshimichi Amma, Yyongming Jung, Massimiliano Guasoni, David J. Richardson TITLE:Controlled generation of picosecond-pulsed higher-order Poincaré sphere beams from an ytterbium-doped multicore fiber amplifier JOURNAL:Photonics Research PAPER DOI IF KNOWN:https://doi.org/10.1364/PRJ.475287 -------------------- DATA & FILE OVERVIEW -------------------- This dataset contains: all originally measured and calcuated data for plotting figures within the article. [File list (filenames, directory structure (for zipped files) and brief description of all data files)] The figures are as follows: Fig. 1. Yb-doped 6-core MCF. (a) Microscopic image of fiber cross-section. (b) The refractive index profile of the fabricated preform. (c) The ASE spectrum of the MCF. Fig. 3. Yb-MCF amplifier characterization. (a) Measured near-field intensity distribution of the MCF output. (b) Average output power versus the launched pump power. (c) Measured spectra of the seed and of the amplified output at an average output power of ~12.3 W (resolution=0.5nm(upper), =0.02nm(lower)). (d) Temporal pulse shapes of the seed and the amplified output at ~12.3 W. Fig. 4. The generation of linearly polarized Gaussian beams. (a) Far-field beam profiles without beam shaping. (b) Simulated far-field intensity distribution when all cores are in-phase. (c), (d) Experimentally measured far-field Gaussian beam profiles at the peak power of ~8.14 kW with the orthogonal polarization states. Fig. 5. The generation of CV beams. (a) Simulated far-field intensity distribution when the polarization orientations of the 6 beamlets are set as per the arrow directions in (b). (c) Experimentally measured radially polarized output beam profile with a peak power of ~11.4 kW, and the two-lobe patterns when the beam is passed through a linear polarizer at different orientations (white arrows). (d) Experimentally measured azimuthally polarized beam profile (at ~10 kW) and the two-lobe patterns after passing through the linear polarizer. Fig. 6. The generated OAM beams (1st order). (a), (d) Experimentally measured output beam profiles with a peak power of ~10.7 kW and the topological charge of ±1, respectively, as well as the corresponding intensity distributions after the beam was passed through a rotatable linear polarizer. (b), (e) The measured spiral interference fringes for the generated OAM beams shown in (a) and (d). (c), (f) One-dimensional intensity profiles across the beam center fitted with an incoherent superposition of the LP01 mode and the OAM mode. Fig. 7. The generation of OAM beams (2nd order). (a) Simulated far-field distribution when the relative phase of the 6 beamlets is set to the value given in (b). (c), (d) Experimentally measured beam profiles with a peak power of ~14.4 kW and the topological charge of ±2, respectively, as well as the corresponding intensity distributions after passing through a rotatable linear polarizer. (e), (f) The measured spiral interference fringes for the generated OAM beams shown in (c) and (d). Fig. 8. Numerical analysis on the factors affecting the combining efficiency and far-field beam shape. (a) Calculated combining efficiency of the 1st order OAM as a function of MLA defocus with different mode composition (weight w of LP01 mode) of the MCF output. (b) The combining efficiency of the combined Gaussian and OAM beams with different MLA shifts in the CBC setup. (c) The combining efficiency of the combined beams with different power distributions of the MCF beamlets. (d) Near-field and far-field intensity profiles under different power distributions (A-D shown in (c)). -------------------------- METHODOLOGICAL INFORMATION -------------------------- Description of methods used for collection/generation of data: The data include different kinds of formats, for instance, the beam profile imgages were collected with a CCD camera; the optical spectra were measured a commercial optical spectrum analyser; the pulse shape was measured with a oscilloscope. Methods for processing the data: The data were processed with Matlab. Software- or Instrument-specific information needed to interpret the data, including software and hardware version numbers: Excel, matlab, python, etc. Standards and calibration information, if appropriate: N/A. Environmental/experimental conditions: In the lab at the Optoelectronic Research Centre. Describe any quality-assurance procedures performed on the data: N/A. People involved with sample collection, processing, analysis and/or submission: N/A. -------------------------- DATA-SPECIFIC INFORMATION -------------------------- Number of variables: details are given in each tab of the datafile. Number of cases/rows: details are given in each tab of the datafile. Variable list, defining any abbreviations, units of measure, codes or symbols used:details are given in each tab of the datafile. Missing data codes: N/A. Specialized formats or other abbreviations used: N/A.