title: Large-scale optical diffraction tomography for inspection of optical plastic lenses.
abstract: Herein is presented an optical diffraction tomography (ODT) technique for measuring 3-D refractive index (RI) maps of optical plastic lenses. A Mach-Zehnder interferometer was used to measure multiple complex optical fields of a plastic lens immersed in RI-matching oil at various rotational orientations. From this, ODT was used to reconstruct a 3-D RI distribution of the plastic lens with unprecedented RI sensitivity (Δn=4.21×10(-5) and high resolution (12.8 μm). As a demonstration, 3-D RI distributions of a 2 mm-diameter borosilicate sphere and a 5 mm-diameter plastic lens were reconstructed. Defects in the lens, generated by pulsed laser ablation, were also detected using the present method.
authors.forename: Kyoohyun
authors.initials: K
authors.lastname: Kim
authors.forename: Jonghee
authors.initials: J
authors.lastname: Yoon
authors.forename: YongKeun
authors.initials: Y
authors.lastname: Park
mesh_terms: D007368:Interferometry; D007909:Lenses; D010969:Plastics; D012031:Refractometry; D041622:Tomography, Optical / Q000295:instrumentation / Q000379:methods*
chemical_list: D010969:Plastics