Morita Shin-Ya, Nishidate Yohei, Nagata Takashi, Yamagata Yutaka, Teodosiu Cristian
VCAD System Research Program, RIKEN, Saitama 351-0198, Japan.
Appl Opt. 2010 Jun 20;49(18):3442-51. doi: 10.1364/AO.49.003442.
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.
