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.