Christopher A. Hall
Engineer at QED Technologies
SPIE Involvement:
Author | Instructor
Publications (12)

Proceedings Article | 15 November 2019 Presentation + Paper
Proc. SPIE. 11175, Optifab 2019
KEYWORDS: Polishing, Aspheric lenses, Magnetorheological finishing

Proceedings Article | 11 December 2017 Paper
Proc. SPIE. 10447, Laser-Induced Damage in Optical Materials 2017
KEYWORDS: Polishing, Silica, Etching, Laser induced damage, Particles, Surface roughness, Wet etching, Laser damage threshold, Abrasives, Magnetorheological finishing, Surface finishing

Proceedings Article | 16 October 2017 Paper
Proc. SPIE. 10448, Optifab 2017
KEYWORDS: Mirrors, Optical design, Polishing, Optical coatings, Magnetism, Wavefronts, Optics manufacturing, Assembly tolerances, Magnetorheological finishing, Surface finishing

Proceedings Article | 11 October 2015 Paper
Proc. SPIE. 9633, Optifab 2015
KEYWORDS: Photovoltaics, Polishing, Metrology, Visualization, Spatial frequencies, Linear filtering, Optical fabrication, Aspheric lenses, Tolerancing, Surface finishing

Proceedings Article | 15 October 2013 Paper
Proc. SPIE. 8884, Optifab 2013
KEYWORDS: Polishing, Metrology, Interferometers, Quality measurement, Aspheric lenses, Abrasives, Yield improvement, Magnetorheological finishing, Surface finishing, Gemini Planet Imager

Showing 5 of 12 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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