title: Measurement of thickness profiles of glass plates by analyzing Haidinger fringes.
abstract: We report what we believe is a novel method for measuring the thickness profiles of plane parallel plates by analyzing their Haidinger fringes. When an extended monochromatic source is viewed through a ∼1-mm-thick plate, concentric transmission-type Haidinger fringes can easily be observed. Small variations in the plate thickness result in changes in the radii of the ring fringes. In this study, we scanned 20-mm-diameter fused silica and BK7 plates while tracing a specific ring in each fringe pattern to measure the thickness profiles of the plates, achieving an uncertainty of 2 nm in the measurements of the thickness differences between two locations on each plate.
authors.forename: Ju Eun
authors.initials: JE
authors.lastname: Park
authors.forename: Jiung
authors.initials: J
authors.lastname: Kim
authors.forename: Myoungsik
authors.initials: M
authors.lastname: Cha