Webinar Programs

Surface Slope Tolerances

This webinar will describe the effects of surface slope errors – concentrating on the "mid spatial frequency" region – on image quality, and will describe methods for determining tolerances for surface slope. Optical surfaces are increasingly fabricated using modern machining techniques (diamond turning, magnetorheological finishing, and other forms of computer-controlled polishing), and these processes have different "error signatures" than traditional pitch polishing of spherical surfaces. Therefore, when specifying surfaces that will be fabricated by a machining technique, it is important to understand how these error types affect the image quality and to place some form of tolerance to ensure adequate performance from the system.  Equally important, the tolerance should not be unnecessarily tight, as this will increase the fabrication cost without improving the performance in a meaningful way.

What You Will Learn/Seminar Objectives
  • Understand (in general) the effects of mid-frequency surface errors in image quality
  • Learn how such errors can be simulated for a particular optical system
  • Discover how to select tolerance levels that are meaningful without being overly restrictive
  • John Rogers, Ph.D, Senior Scientist for Imaging Optics, Synopsys
Who Should Attend:
  • Optical designers, particularly those who use aspheric surfaces
  • Metrologists, who need to measure aspheric surfaces
  • Fabricators, who need to understand the needs of optical designers
Intermediate: The webinar will address areas of system performance and tolerancing not typically covered in introductory-level presentations.
Seminar Information
Date Presented:
November 14, 2013 1:00 PM Eastern
1 hour
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Surface Slope Tolerances

John Rogers, Ph.D. is a Senior Scientist for Imaging Optics at Synopsys. He received his Ph.D. from the Optical Sciences Center at the University of Arizona in 1984, and spent 10 years working as an optical designer and metrologist in the Swiss optical industry, at Kern AG and later at Leica. For 4 years he taught geometrical optics and optical testing at the University of Rochester. In 1987 he joined Optical Research Associates (now Synopsys) where, working in the Engineering Services group, he has designed a wide variety of optical systems including many that contain aspheric elements.
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