PERFORMANCE AND SPECIFICATION OF OPTICAL COMPONENTS WITH MID-SPATIAL FREQUENCY SURFACE ERRORS

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Aryan, H. (2019). PERFORMANCE AND SPECIFICATION OF OPTICAL COMPONENTS WITH MID-SPATIAL FREQUENCY SURFACE ERRORS. Unc Charlotte Electronic Theses And Dissertations.
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Abstract

The advent of sub-aperture computer-numerically controlled (CNC) manufacturing techniques has enabled new opportunities for high-performance optical components and systems. Freeform and other challenging designs are now possible like never before. However, such manufacturing techniques also introduce significant challenges. Mid-spatial frequency (MSF) surface errors are inherent side-effects from sub-aperture manufacturing methods that create prominent constraints on optical design, fabrication, metrology, and performance. Existing methods for specification and measurement of MSF errors in optical systems typically assume isotropic error distributions, which give misleading results for the anisotropic, structured MSF errors that are common with CNC machining. This dissertation investigates MSF errors from three perspectives: (i) Optimization of manufacturing parameters to balance the impacts of MSF errors with manufacturing costs; (ii) Understanding effects of MSF errors on optical performance and creating analysis tools to capture these impacts; and (iii) Development of specification methods for surfaces with MSF errors. Results are addressed through three articles. The first article presents predictive models that provide a means to optimize manufacturing parameters for diamond-machined optics based on their targeted performance. The second article introduces a new, practical tool to characterize the impacts of MSF errors on performance through a novel analysis of the modulation transfer function. The third article presents a novel surface specification method for MSF errors that can be used by designers for optical tolerancing and by manufacturers for acceptance testing. The approaches introduced in the second and the third articles provide a closed-loop for specification, testing, and tolerancing of optical surfaces with MSF errors.

Details
Author

Aryan, Hamidreza

Title

PERFORMANCE AND SPECIFICATION OF OPTICAL COMPONENTS WITH MID-SPATIAL FREQUENCY SURFACE ERRORS

Physical Description

1 online resource (91 pages) : PDF

Date

2019

Degree Granting Institution

University of North Carolina at Charlotte

Abstract

The advent of sub-aperture computer-numerically controlled (CNC) manufacturing techniques has enabled new opportunities for high-performance optical components and systems. Freeform and other challenging designs are now possible like never before. However, such manufacturing techniques also introduce significant challenges. Mid-spatial frequency (MSF) surface errors are inherent side-effects from sub-aperture manufacturing methods that create prominent constraints on optical design, fabrication, metrology, and performance. Existing methods for specification and measurement of MSF errors in optical systems typically assume isotropic error distributions, which give misleading results for the anisotropic, structured MSF errors that are common with CNC machining. This dissertation investigates MSF errors from three perspectives: (i) Optimization of manufacturing parameters to balance the impacts of MSF errors with manufacturing costs; (ii) Understanding effects of MSF errors on optical performance and creating analysis tools to capture these impacts; and (iii) Development of specification methods for surfaces with MSF errors. Results are addressed through three articles. The first article presents predictive models that provide a means to optimize manufacturing parameters for diamond-machined optics based on their targeted performance. The second article introduces a new, practical tool to characterize the impacts of MSF errors on performance through a novel analysis of the modulation transfer function. The third article presents a novel surface specification method for MSF errors that can be used by designers for optical tolerancing and by manufacturers for acceptance testing. The approaches introduced in the second and the third articles provide a closed-loop for specification, testing, and tolerancing of optical surfaces with MSF errors.

Genre

doctoral dissertations

Subjects--Topics

Mechanical engineering
Optics
Engineering

Degree

Ph.D.

Keywords

Freeform Optics
Mid-Spatial Frequency Surface Errors
Minimum Modulation Curve
Optical Fabrication and Testing
Polar RMS Plot
Surface Metrology

Subject Area

Optical Science & Engineering

Advisor(s)

Suleski, Thomas

Committee Members

Suleski, Thomas
Boreman, Glenn
Davies Allen, Angela
Evans, Christopher

Degree Note

Thesis (Ph.D.)--University of North Carolina at Charlotte, 2019.

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Rights Holder Information

Copyright is held by the author unless otherwise indicated.

Identifier

Aryan_uncc_0694D_12269

Permalink

http://hdl.handle.net/20.500.13093/etd:2362