title: Ray-tracing simulation method using piecewise quadratic interpolant for aspheric optical systems.
abstract: We present a new method for precise ray-tracing simulation considering form errors in the fabrication process of aspheric lenses. The Nagata patch, a quadratic interpolant for surface meshes using normal vectors, is adopted for representing the lens geometry with mid-spectral frequencies of surface profile errors. Several improvements in the ray-patch intersection calculation and its acceleration technique are also proposed. The developed algorithm is applied to ray-tracing simulation of optical disk pick-up aspheric objectives, and this technique requires 10(5) to 10(9) times fewer patches than a polygonal approximation. The simulation takes only several seconds on a standard PC.
authors.affiliation: VCAD System Research Program, RIKEN, Saitama 351-0198, Japan. morishin@riken.jp
authors.forename: Shin-Ya
authors.initials: SY
authors.lastname: Morita
authors.forename: Yohei
authors.initials: Y
authors.lastname: Nishidate
authors.forename: Takashi
authors.initials: T
authors.lastname: Nagata
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Yamagata
authors.forename: Cristian
authors.initials: C
authors.lastname: Teodosiu