Paul Dumas
Applications Engineering Manager at QED Technologies Inc
SPIE Involvement:
Author | Instructor
Publications (35)

Proceedings Article | 15 November 2019 Presentation + Paper
Proceedings Volume 11175, 111750Q (2019)
KEYWORDS: Magnetorheological finishing, Polishing, Imaging systems, Plano, Head, Switches

Proceedings Article | 16 October 2017 Paper
Proceedings Volume 10448, 1044806 (2017)
KEYWORDS: Magnetorheological finishing, Polishing, Optics manufacturing, Optical design, Lithography, Optical spheres, Defense systems, Surface finishing, Head

Proceedings Article | 16 October 2017 Paper
Proceedings Volume 10448, 1044818 (2017)
KEYWORDS: Metrology, Aspheric lenses, Freeform optics, Heads up displays, Optical spheres, Stitching interferometry, Interferometry, Computer generated holography, Mirrors, Reflection

Proceedings Article | 16 October 2017 Paper
Proceedings Volume 10448, 104480I (2017)
KEYWORDS: Aspheric lenses, Magnetorheological finishing, Spherical lenses, Aspheric optics, Optics manufacturing, Manufacturing, Wavefronts, Point spread functions, Polishing

Proceedings Article | 16 October 2017 Paper
Proceedings Volume 10448, 104480H (2017)
KEYWORDS: Optical spheres, Polishing, Aspheric lenses, Optics manufacturing, Magnetorheological finishing, Surface finishing, Metrology, Aspheric optics, Manufacturing, Mirrors

Showing 5 of 35 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.
SC1279: Introduction to Magnetorheological Finishing
This course explains the basic principles, operation and applications of Magnetorheological Finishing (MRF). Over the past 2 decades, MRF has gone from a cutting edge new technology to a standard used by optics shops around the world for the finishing of high-precision plano, spherical, aspherical and freeform optics. MRF not only enables higher-precision on complex optics, it can also be used to increase yields, increase throughput, improve on-time delivery, and otherwise increase your shop’s “manufacturing confidence”. Anyone who wants to answer questions such as, "how does MRF work?", “what can MRF be used for” or "how does MRF integrate with my other grinding, polishing, and/or diamond turning capabilities?" will benefit from taking this course.
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