1. ABOUT THE DATASET -------------------- Title: Data associated with Stereolithography 3D Printing of a Cyclic Olefin Resin for Terahertz Quasi-Optical Applications Creator(s): LUKE PHILLIPS [1], SANCHIT KONDAWAR [2,3], HARRY J. GODDEN [2], BEN DOUGLAS [4], NATHAN R. FOX [2], MOHAMMED SALIH [2], ALEXANDER VALAVANIS [2], ANDREW D. BURNETT [5], ROBERT KAY [1], RAYMOND A. WEITEKAMP [6], EHAB SALEH [1,7] Organisation(s): [1] School of Mechanical Engineering, The University of Leeds, Leeds LS2 9JT, U.K. [2] School of Electronic and Electrical Engineering, The University of Leeds, Leeds LS2 9JT, U.K. [3] UCL Electronic & Electrical Engineering, Roberts Building, Torrington Pl, London WC1E 7JE [4] School of Chemical and Process Engineering, University of Leeds, Leeds, UK [5] School of Chemistry, The University of Leeds, Leeds LS2 9JT, U.K. [6] polySpectra, Berkley, California, 9470, United States [7] College of Engineering and Technology, University of Doha for Science and Technology, Doha, Qatar. Rights-holder(s):Unless otherwise stated, Copyright 2026 University of Leeds Publication Year: 2026 Description: A data set containing the THz-TDS results (Absorption Coefficient & Refractive Index) of 3D-printed Cyclic Olefin Resin (COR) samples and the THz-QCL characterisation results on 3D-printed COR lenses, Cite as: Luke Phillips, Sanchit Kondawar, Harry J. Godden, Ben Douglas, Nathan R. Fox, Mohammed Salih, Alexander Valavanis, Andrew D. Burnett, Robert Kay, Raymond A. Weitekamp, Ehab Saleh (2026): Data associated with Stereolithography 3D Printing of a Cyclic Olefin Resin for Terahertz Quasi-Optical Applications. [Dataset]. https://doi.org/10.5518/1791 Related publication: Luke Phillips, Sanchit Kondawar, Harry J. Godden, Ben Douglas, Nathan R. Fox, Mohammed Salih, Alexander Valavanis, Andrew D. Burnett, Robert Kay, Raymond A. Weitekamp, Ehab Saleh (2026): Stereolithography 3D Printing of a Cyclic Olefin Resin for Terahertz Quasi-Optical Applications, Optical Materials Express. https://doi.org/10.1364/OME.601125 Contact: mnlcjp@leeds.ac.uk 2. TERMS OF USE --------------- Copyright 2026 University of Leeds. Unless otherwise stated, this dataset is licensed under a Creative Commons Attribution 4.0 International Licence: https://creativecommons.org/licenses/by/4.0/. 3. PROJECT AND FUNDING INFORMATION ---------------------------------- The authors gratefully acknowledge financial support from the following sources: UK Research and Innovation (Future Leader Fellowship MR/S016969/1 and MR/Y011775/1) Institute of Design, Robotics and Manufacturing, University of Leeds, U.K. The School of Mechanical Engineering, University of Leeds, U.K. 4. CONTENTS ----------- File listing COR THz-TDS Results - COR Absorption Coefficient and Refractive Index from 0.5 to 6 THz - THz-TDS COR Time Domain Scans COR THz-QCL Measurements - COR Fresnel Lens at 3.52 THz Beam Profiling -THz-QCL Fresnel Lens Beam Profile Measurements at 3.52 THz - Signal Power Measurements at 3.4 THz - THz-QCL Signal Power Measurements at 3.4 THz 5. METHODS ---------- COR samples and quasi-optical components were fabricated using a masked stereolithography (MSLA) 3D printer. The samples were characterised from 0.5–6 THz using THz time-domain spectroscopy (THz-TDS). The acquired THz-TDS scans were Fourier transformed to extract the absorption coefficients and refractive indices of the samples. A 3D printed COR plano-convex lens and Fresnel lens were characterised using two THz-QCL systems, one operating at 3.4 THz for power measurements and the second operating at 3.52 THz for beam profile measurements.