title: Standard optical coaxial double fiber diameter and refractive index measurement, accuracy, and precision using light scattering at normal incidence.
abstract: A plane-polarized laser wave with a wavelength of 441.6 nm illuminates a cladding optical fiber with a diameter of about 18 to 38 mum at normal incidence. A measured angular distribution of the intensity of the scattered wave corresponds well with the differential cross section of a rigorous theoretical calculation of a coaxial double cylinder over a wide range of scattering angle. The diameter and refractive index of the cladding and core of the illuminated part of a fiber have been determined accurately for each uncertainty.
authors.affiliation: Faculty of Education and Human Sciences, Yokohama National University, 79-2 Tokiwadai Hodogaya-ku, Yokohama 240-8501, Japan. tajima@ynu.ac.jp
authors.forename: Fumiaki
authors.initials: F
authors.lastname: Tajima
authors.forename: Yoshio
authors.initials: Y
authors.lastname: Nishiyama
authors.forename: Noriyoshi
authors.initials: N
authors.lastname: Hiroi
authors.forename: Yoshihide
authors.initials: Y
authors.lastname: Hashimoto