Photon Engineering LLC

Williams, AZ, United States

Photon Engineering LLC

Williams, AZ, United States
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Choi N.,University of Central Florida | Harvey J.E.,Photon Engineering LLC
Optical Engineering | Year: 2013

Abstract. The generalized Harvey-Shack (GHS) surface scatter theory is numerically compared to the classical small perturbation method, the Kirchhoff approximation method, and the rigorous method of moments for one-dimensional ideally conducting surfaces whose surface power spectral density function is Gaussian or exhibits an inverse power law (fractal) behavior. In spite of its simple analytic form, our numerical comparison shows that the new GHS theory is valid (with reasonable accuracy) over a broader range of surface parameter space than either of the two classical surface scatter theories. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License..


Seassal C.,École Centrale Lyon | Koshel J.,Photon Engineering LLC | Koshel J.,University of Arizona
Optics Express | Year: 2013

This focus issue highlights selected contributions from authors who presented promising concepts at OSA's Renewable Energy and the Environment Optics and Photonics Congress held 11-15 November 2012 in Eindhoven, The Netherlands. © 2013 Optical Society of America.


Pfisterer R.N.,Photon Engineering LLC
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2012

The process to convert raw profilometer data describing surface roughness into PSD and BSDF is discussed, but not well-documented in the open optical engineering literature, and is therefore prone to procedural mistakes. This paper describes the step-by-step numerical process as well as the three "check points" that insure that errors have not been introduced into the calculation. A numerical example is discussed. © 2012 SPIE.


Mulder S.,Photon Engineering LLC
Optics InfoBase Conference Papers | Year: 2013

A number of simple graphical methods for designing optics in CAD are presented. These methods are based on the law of reflection, Snell's Law, Fermat's principle and a property of focal conics. These graphical methods will be illustrated using the practical example of designing a catadioptric LED collimator. © OSA 2013.


Harvey J.E.,Photon Engineering LLC
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2013

The modulation transfer function (MTF) is widely used as the image quality criterion of choice for imaging applications where fine detail in extended images needs to be specified or evaluated. In this paper we present a parametric analysis of the effect of scattered light upon the MTF of an imaging system, and illustrate the results for three specific applications: (i) a visible Newtonian telescope with moderately good optical surfaces which produce no significant effect upon the MTF, (ii) an extreme ultraviolet Newtonian telescope where scattering effects can dominate both diffraction effects and aberrations in the resulting image degradation even for state-of-the-art optical surfaces, and (iii) a visible system made up of three diamond-turned off-axis aspheric mirrors where we use the predicted MTF to estimate whether post-polishing is required (huge cost and schedule impact) to meet a specific image quality requirement. © 2013 SPIE.


Harvey J.E.,Photon Engineering LLC
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2014

Anecdotes and recollections from a graduate student at the Optical Sciences Center (OSC) in the late 1960s and early 1970s. The early faculty of the OCS fostered an exciting environment where even graduate students served significant roles on major government research contracts. Teamwork and collaboration between research groups was often required to meet the contract goals. This unique learning experience at the OSC almost 50 years ago served as a springboard for a satisfying and rewarding career in Optical Engineering. © 2014 SPIE.


Harvey J.E.,Photon Engineering LLC
Applied Optics | Year: 2015

The recent validation of a generalized linear systems formulation of surface scatter theory and an analysis of image degradation due to surface scatter in the presence of aberrations has provided credence to the development of a systems engineering analysis of image quality as degraded not only by diffraction effects and geometrical aberrations, but to scattering effects due to residual optical fabrication errors as well. This generalized surface scatter theory provides insight and understanding by characterizing surface scatter behavior with a surface transfer function closely related to the modulation transfer function of classical image formation theory. Incorporating the inherently band-limited relevant surface roughness into the surface scatter theory provides mathematical rigor into surface scatter analysis, and implementing a fast Fourier transform algorithm with logarithmically spaced data points facilitates the practical calculation of scatter behavior from surfaces with a large dynamic range of relevant spatial frequencies. These advances, combined with the continuing increase in computer speed, leave the optical design community in a position to routinely derive the optical fabrication tolerances necessary to satisfy specific image quality requirements during the design phase of a project; i.e., to integrate optical metrology and fabrication into the optical design process. © 2015 Optical Society of America.


Pfisterer R.N.,Photon Engineering LLC
Optics and Photonics News | Year: 2011

Reasonable approximation of scatter models is made for stray light analysis. In the model, the ratio of the A and B specific model parameters is equal to the peak bidirectional scattering distribution function (BSDF) in the specular direction. For a valid model for optical surface scatter the surface roughness must be isotropic and the rms surface roughness must be much less than the incident wavelength. The reduction of surface damage dramatically changes the power-spectral density (PSD) power-law falloff. Although the model has three parameters, two are well-bounded, so a set of assumptions is made that leads to some convenient formulas for deriving scatter models. The Lambertian scatter model is degenerate in the sense that it is not dependent on the incident and scattered angles, this makes it convenient for back-of-the-envelope calculations.


Pfisterer R.N.,Photon Engineering LLC
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2014

Modern optical engineering software has become very powerful and capable over the past 30 years, but the user must be knowledgeable about what the software is trying to say. In this paper, four examples of a complete misunderstanding of the software are presented with comments. Finally the story of the optical analysis of the ALPHA laser is presented as an example of initially not recognizing the significance of a software modeling result, and then realizing the mistake and correcting it months later. © 2014 SPIE.


Trademark
Photon Engineering LLC | Date: 2014-05-17

Computer software for modeling, designing, analyzing, and use of optical and lighting systems.

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