Network


Latest external collaboration on country level. Dive into details by clicking on the dots.

Hotspot


Dive into the research topics where Greg R. Schmidt is active.

Publication


Featured researches published by Greg R. Schmidt.


International Optical Design Conference and Optical Fabrication and Testing (2010), paper JMB46P | 2010

Concentrated photovoltaics stepped planar light guide

Duncan T. Moore; Greg R. Schmidt; Blair Unger

This work presents a planar optical light guide design for concentrating solar power onto a photovoltaic cell. The design allows concentrated light injected into the guide to avoid interaction with other injection facets. The presented design has a HFOV of 1°, geometrical concentration of 112.5x at the output of the guide, and can achieve greater than 500x with secondary concentration.


Optical Engineering | 2013

Design and fabrication of a polymer gradient-index optical element for a high-performance eyepiece

Anthony J. Visconti; Kejia Fang; James A. Corsetti; Peter McCarthy; Greg R. Schmidt; Duncan T. Moore

Abstract. A 40-deg full field-of-view high-performance eyepiece design utilizing a polymer spherical gradient-index (GRIN) optical element is presented. In the design process, the GRIN lens material is constrained to current manufacturing capabilities. Several spherical GRIN lens blanks are fabricated from a thermoformable axial GRIN polymethyl methacrylate polystyrene copolymer material. One is diamond turned into a lens for the eyepiece, and the additional blanks are used to characterize the fabrication process. The spherical GRIN profile is evaluated in the original design, and a tolerance analysis is provided.


International Optical Design Conference and Optical Fabrication and Testing (2010), paper ITuC5 | 2010

Design, assembly, and testing of a spectral splitting solar concentrator module

Eric Christensen; Greg R. Schmidt; Blair Unger; Duncan T. Moore

This paper describes the design, assembly, and testing of a concentrating photovoltaic module which uses spectral splitting to achieve high system power efficiency. The assembly and testing of two prototype modules is also described. An efficiency of 37.5% was measured on the highest performing module.


Applied Optics | 2016

Simultaneous interferometric measurement of linear coefficient of thermal expansion and temperature-dependent refractive index coefficient of optical materials

James A. Corsetti; William E. Green; Jonathan D. Ellis; Greg R. Schmidt; Duncan T. Moore

Characterizing the thermal properties of optical materials is necessary for understanding how to design an optical system for changing environmental conditions. A method is presented for simultaneously measuring both the linear coefficient of thermal expansion and the temperature-dependent refractive index coefficient of a sample interferometrically in air. Both the design and fabrication of the interferometer is presented as well as a discussion of the results of measuring both a steel and a CaF2 sample.


Proceedings of SPIE, the International Society for Optical Engineering | 2006

Tapered gradient index microlenses for compound lens arrays

Greg R. Schmidt; Duncan T. Moore

In nature, the compound eye is the most common micro optical system. Currently there are few artificial compound eye designs incorporated into existing technology. Modeling and fabrication of tapered gradient index polymer lenses are in development for application in a compound array system that operates similar to the neural superposition eye. An artificial adaptation will have multiple optical channels that all have simultaneous access to a large field of view.


Proceedings of SPIE | 2015

Optical design study of a VIS-SWIR 3X zoom lens

Rebecca Berman; James A. Corsetti; Kejia Fang; Eryn Fenning; Peter McCarthy; Greg R. Schmidt; Anthony J. Visconti; Daniel J. L. Williams; Anthony J. Yee; Yang Zhao; Julie Bentley; Duncan T. Moore; Craig Olson

A design study is compiled for a VIS-SWIR dual band 3X zoom lens. The initial first order design study investigated zoom motion, power in each lens group, and aperture stop location. All designs were constrained to have both the first and last lens groups fixed, with two middle moving groups. The first order solutions were filtered based on zoom motion, performance, and size constraints, and were then modified to thick lens solutions for the SWIR spectrum. Successful solutions in the SWIR were next extended to the VIS-SWIR. The resulting nine solutions are all nearly diffraction limited using either PNNP or PNPZ (“Z” indicating the fourth group has a near-zero power) design forms with two moving groups. Solutions were found with the aperture stop in each of the four lens groups. Fixed f-number solutions exist when the aperture stop is located at the first and last lens groups, while varying f-number solutions occur when it is placed at either of the middle moving groups. Design exploration included trade-offs between parameters such as diameter, overall length, back focal length, number of elements, materials, and performance.


International Optical Design Conference | 2014

All-plastic high-performance eyepiece design utilizing a spherical gradient-index lens

Anthony J. Visconti; Kejia Fang; Greg R. Schmidt; Duncan T. Moore

An all-plastic high-performance eyepiece design utilizing a polymer spherical gradient-index optical element is presented. The use of a gradient-index lens in the eyepiece offers better off-axis and chromatic aberration correction, as well as overall performance improvement compared to a similar eyepiece with all homogeneous lenses.


Proceedings of SPIE | 2013

Design, fabrication, and metrology of polymer gradient-index lenses for high-performance eyepieces

James A. Corsetti; Anthony J. Visconti; Kejia Fang; Peter McCarthy; Greg R. Schmidt; Duncan T. Moore

High-performance eyepiece designs have been carried out using both spherical and radial gradient-index (GRIN) elements. Eyepiece designs of both geometries are shown to offer superior imaging performance with fewer elements when compared to purely homogeneous systems. These GRIN lenses are formed from monomer diffusion between polymethyl methacrylate (PMMA) and polystyrene (PSTY) during the polymerization process, resulting in a copolymer of the two homogeneous materials. A process for fabricating spherical GRIN elements is discussed where copolymer axial GRIN blanks are thermally compressed using spherical surface molds. This process curves the nominally-straight isoindicial surfaces of the axial GRIN rod to be consistent with the shape found during optimization of the design. Once compressed, the spherical blanks are diamond-turned for final surface figure and finish. Measurement of the GRIN profile is carried out using the Schmidt immersion technique in a Mach-Zehnder interferometer. Tolerances specific to GRIN elements are identified and determined to be readily achievable using the aforementioned manufacturing process.


Optical Engineering | 2013

Athermalization of polymer radial gradient-index singlets

James A. Corsetti; Leo R. Gardner; Greg R. Schmidt; Duncan T. Moore

Abstract. The article explores the possibility of athermalizing a gradient-index (GRIN) lens so that the effective focal length (EFL) of the element remains constant over a change in temperature. This is accomplished by designing the lens so that the surface curvatures and index profile compensate for one another over a change in temperature to maintain constant optical power. The means to determine how the lens geometry and index profile change with temperature for both a homogeneous and radial GRIN are explained. An analytic model for the purpose of identifying athermalized GRIN singlets is described and validated against the previous work in this field. The model is used to identify an athermalized polymer radial GRIN element and compare it with four other polymer elements of the same focal length but different index profiles, including a homogeneous one. Comparison of these singlets in CODE V® optical design software shows that the athermalized GRIN element maintains its nominal EFL over a temperature change the best of the five in the group while the homogeneous element (having no GRIN profile to counteract the effect of temperature on the surface curvatures) has the poorest performance. A numerical model to analyze more complicated GRIN systems is discussed.


Optical Engineering | 2013

Eyepiece designs with radial and spherical polymer gradient-index optical elements

Anthony J. Visconti; James A. Corsetti; Kejia Fang; Peter McCarthy; Greg R. Schmidt; Duncan T. Moore

Abstract. Radial and spherical polymer gradient-index (GRIN) eyepiece designs are presented. The chromatic behavior of GRIN profiles is constrained to real material properties of a polymethyl methacrylate polystyrene copolymer gradient-index system. Single-element, two-element, and multielement eyepiece design configurations each demonstrate significant spot diameter and modulation transfer function performance improvements with the use of a GRIN element. A high-performance spherical GRIN eyepiece design, with 48-deg full field-of-view and 3% distortion, is compared to a similar homogeneous glass solution.

Collaboration


Dive into the Greg R. Schmidt's collaboration.

Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar

Kejia Fang

The Institute of Optics

View shared research outputs
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar

Yang Zhao

University of Rochester

View shared research outputs
Top Co-Authors

Avatar
Researchain Logo
Decentralizing Knowledge