Dr. Gregory W. Forbes
Adjunct Professor
SPIE Involvement:
Author | Instructor
Publications (23)

SPIE Journal Paper | 4 October 2018
OE Vol. 57 Issue 10
KEYWORDS: Wavefronts, Optical design, Optical engineering, Error analysis, Zernike polynomials, Ray tracing, Statistical analysis, Vignetting, Visualization, Light emitting diodes

Proceedings Article | 27 November 2017 Paper
Proc. SPIE. 10590, International Optical Design Conference 2017

Proceedings Article | 22 June 2015 Paper
Proc. SPIE. 9525, Optical Measurement Systems for Industrial Inspection IX
KEYWORDS: Photovoltaics, Point spread functions, Multilayers, Metrology, Statistical analysis, Imaging systems, 3D modeling, Modulation transfer functions, Tolerancing, Surface finishing

Proceedings Article | 15 October 2013 Paper
Proc. SPIE. 8884, Optifab 2013
KEYWORDS: Monochromatic aberrations, Mirrors, Optical design, Prisms, Optical spheres, Wavefronts, Zernike polynomials, Aspheric lenses, Modulation transfer functions, Optics manufacturing

Proceedings Article | 15 October 2013 Paper
Proc. SPIE. 8884, Optifab 2013
KEYWORDS: Optical design, Optical spheres, Interferometers, Manufacturing, Wavefronts, Lens design, Optical fabrication, Aspheric lenses, Optimization (mathematics), Optics manufacturing

Showing 5 of 23 publications
Course Instructor
SC1039: Evaluating Aspheres for Manufacturability
This course provides an overview of how aspheric surfaces are designed, manufactured, and measured. The primary goal of this course is to teach how to determine whether a particular aspheric surface design will be difficult to make and/or test. This will facilitate cost/performance trade off discussions between designers, fabricators, and metrologists. We will begin with a discussion of what an asphere is and how they benefit optical designs. Next we will explain various asphere geometry characteristics, especially how to evaluate local curvature plots. We will also review flaws of the standard polynomial representation, and how the Forbes polynomials can simplify asphere analysis. Then we will discuss how various specifications (such as figure error and local slope) can influence the difficulty of manufacturing an asphere. Optical assembly tolerances, however, are beyond the scope of this course - we will focus on individual elements (lenses / mirrors). The latter half of the course will focus on the more common technologies used to generate, polish, and/or measure aspheric surfaces (e.g. diamond turning, glass molding, pad polishing, interferometry). We'll give an overview of a few generic manufacturing processes (e.g. generate-polish-measure). Then we'll review the main strengths and weaknesses of each technology in the context of cost-effective asphere manufacturing.
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