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

SPIE Journal Paper | 4 October 2018
OE, Vol. 57, Issue 10, 101709, (October 2018) https://doi.org/10.1117/12.10.1117/1.OE.57.10.101709
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
Proceedings Volume 10590, 1059004 (2017) https://doi.org/10.1117/12.2294613

Proceedings Article | 22 June 2015 Paper
Proceedings Volume 9525, 95251B (2015) https://doi.org/10.1117/12.2191135
KEYWORDS: Surface finishing, Photovoltaics, Imaging systems, Point spread functions, Metrology, Tolerancing, Statistical analysis, Modulation transfer functions, 3D modeling, Multilayers

Proceedings Article | 15 October 2013 Paper
G. Forbes, Christoph Menke
Proceedings Volume 8884, 88841C (2013) https://doi.org/10.1117/12.2030495
KEYWORDS: Aspheric lenses, Mirrors, Prisms, Optical design, Wavefronts, Optical spheres, Zernike polynomials, Monochromatic aberrations, Modulation transfer functions, Optics manufacturing

Proceedings Article | 15 October 2013 Paper
Proceedings Volume 8884, 88841D (2013) https://doi.org/10.1117/12.2031897
KEYWORDS: Aspheric lenses, Optical spheres, Interferometers, Lens design, Optical design, Manufacturing, Optics manufacturing, Optimization (mathematics), Wavefronts, Optical fabrication

Showing 5 of 23 publications
Conference Committee Involvement (1)
International Optical Design Conference 2021
27 June 2021 | Online Only, United States
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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