John Koshel
- Associate Dean, Academic Programs
- Professor of Practice, Optical Sciences
- Member of the Graduate Faculty
Contact
- (520) 621-6357
- Meinel Optical Sciences, Rm. 403
- Tucson, AZ 85721
- jkoshel@arizona.edu
Degrees
- Ph.D. Optics
- University of Rochester, Rochester, New York, USA
- Optimal design of optically pumnped lasers
- B.S. Optics
- University of Rochester, Rochester, New York, USA
Work Experience
- College of Optical Sciences, The Univ. of Arizona (2014 - Ongoing)
- Photon Engineering (2009 - 2014)
- Lambda Research Corporation (2006 - 2009)
- Spectrum Astro (2004 - 2007)
- Breault Research Organization (1999 - 2004)
Interests
Teaching
Illumination optics, nonimaging optics, optical design, radiometry
Research
Illumination optics, nonimaging optics, optical design, radiometry, solid-state lighting, solar energy, computer graphics and rendering
Courses
2024-25 Courses
-
Directed Graduate Research
OPTI 792 (Fall 2024) -
Dissertation
OPTI 920 (Fall 2024) -
Independent Study
OPTI 599 (Fall 2024) -
Internship
OPTI 493 (Fall 2024) -
Radiometry, Source & Detector
OPTI 306 (Fall 2024) -
Thesis
OPTI 910 (Fall 2024)
2023-24 Courses
-
Directed Research
OPTI 492 (Summer I 2024) -
Thesis
OPTI 910 (Summer I 2024) -
Dissertation
OPTI 920 (Spring 2024) -
Illumination Engineering
OPTI 485 (Spring 2024) -
Illumination Engineering
OPTI 585 (Spring 2024) -
Optics Instruction & Mentoring
OPTI 689 (Spring 2024) -
Optics Outreach
OPTI 489 (Spring 2024) -
Optics Outreach
OPTI 589 (Spring 2024) -
Thesis
OPTI 910 (Spring 2024) -
What is Light?
OPTI 100H (Spring 2024) -
Dissertation
OPTI 920 (Fall 2023) -
Radiometry, Source & Detector
OPTI 306 (Fall 2023) -
Thesis
OPTI 910 (Fall 2023)
2022-23 Courses
-
Directed Research
OPTI 492 (Summer I 2023) -
Internship
OPTI 493 (Summer I 2023) -
Dissertation
OPTI 920 (Spring 2023) -
Illumination Engineering
OPTI 485 (Spring 2023) -
Illumination Engineering
OPTI 585 (Spring 2023) -
Optics Instruction & Mentoring
OPTI 689 (Spring 2023) -
Optics Outreach
OPTI 489 (Spring 2023) -
Optics Outreach
OPTI 589 (Spring 2023) -
Research
OPTI 900 (Spring 2023) -
Thesis
OPTI 910 (Spring 2023) -
What is Light?
OPTI 100H (Spring 2023) -
Dissertation
OPTI 920 (Fall 2022) -
Radiometry, Source & Detector
OPTI 306 (Fall 2022)
2021-22 Courses
-
Internship
OPTI 493 (Summer I 2022) -
Thesis
OPTI 910 (Summer I 2022) -
Dissertation
OPTI 920 (Spring 2022) -
Illumination Engineering
OPTI 485 (Spring 2022) -
Illumination Engineering
OPTI 585 (Spring 2022) -
Independent Study
OPTI 599 (Spring 2022) -
Master's Report
OPTI 909 (Spring 2022) -
Optics Outreach
OPTI 489 (Spring 2022) -
Optics Outreach
OPTI 589 (Spring 2022) -
Thesis
OPTI 910 (Spring 2022) -
Dissertation
OPTI 920 (Fall 2021) -
Radiometry, Source & Detector
OPTI 306 (Fall 2021) -
Thesis
OPTI 910 (Fall 2021)
2020-21 Courses
-
Dissertation
OPTI 920 (Spring 2021) -
Master's Report
OPTI 909 (Spring 2021) -
Dissertation
OPTI 920 (Fall 2020) -
Radiometry, Source & Detector
OPTI 306 (Fall 2020) -
Radiometry, Source & Detector
OPTI 506 (Fall 2020)
2019-20 Courses
-
Dissertation
OPTI 920 (Spring 2020) -
Illumination Engineering
OPTI 485 (Spring 2020) -
Illumination Engineering
OPTI 585 (Spring 2020) -
Independent Study
OPTI 599 (Spring 2020) -
Thesis
OPTI 910 (Spring 2020) -
What is Light?
OPTI 100H (Spring 2020) -
Dissertation
OPTI 920 (Fall 2019) -
Radiometry, Source & Detector
OPTI 306 (Fall 2019) -
Radiometry, Source & Detector
OPTI 506 (Fall 2019)
2018-19 Courses
-
Directed Research
OPTI 492 (Summer I 2019) -
Dissertation
OPTI 920 (Spring 2019) -
Illumination Engineering
OPTI 485 (Spring 2019) -
Illumination Engineering
OPTI 585 (Spring 2019) -
Master's Report
OPTI 909 (Spring 2019) -
Research
OPTI 900 (Spring 2019) -
Thesis
OPTI 910 (Spring 2019) -
Radiometry, Source & Detector
OPTI 406 (Fall 2018) -
Radiometry, Source & Detector
OPTI 506 (Fall 2018) -
Thesis
OPTI 910 (Fall 2018)
2017-18 Courses
-
Thesis
OPTI 910 (Summer I 2018) -
Directed Graduate Research
OPTI 792 (Spring 2018) -
Honors Independent Study
OPTI 299H (Spring 2018) -
Illumination Engineering
OPTI 485 (Spring 2018) -
Illumination Engineering
OPTI 585 (Spring 2018) -
Master's Report
OPTI 909 (Spring 2018) -
Thesis
OPTI 910 (Spring 2018) -
Directed Graduate Research
OPTI 792 (Fall 2017) -
Independent Study
OPTI 599 (Fall 2017) -
Master's Report
OPTI 909 (Fall 2017) -
Radiometry, Source & Detector
OPTI 406 (Fall 2017) -
Radiometry, Source & Detector
OPTI 506 (Fall 2017) -
Thesis
OPTI 910 (Fall 2017)
2016-17 Courses
-
Directed Research
OPTI 492 (Summer I 2017) -
Research
OPTI 900 (Summer I 2017) -
Thesis
OPTI 910 (Summer I 2017) -
Illumination Engineering
OPTI 485 (Spring 2017) -
Illumination Engineering
OPTI 585 (Spring 2017) -
Independent Study
OPTI 599 (Spring 2017) -
Thesis
OPTI 910 (Spring 2017) -
Directed Graduate Research
OPTI 792 (Fall 2016) -
Master's Report
OPTI 909 (Fall 2016) -
Radiometry, Source & Detector
OPTI 406 (Fall 2016) -
Radiometry, Source & Detector
OPTI 506 (Fall 2016) -
Thesis
OPTI 910 (Fall 2016)
2015-16 Courses
-
Directed Research
OPTI 492 (Summer I 2016) -
Independent Study
OPTI 599 (Summer I 2016) -
Thesis
OPTI 910 (Summer I 2016) -
Honors Independent Study
OPTI 399H (Spring 2016) -
Illumination Engineering
OPTI 485 (Spring 2016) -
Illumination Engineering
OPTI 585 (Spring 2016) -
Master's Report
OPTI 909 (Spring 2016) -
Thesis
OPTI 910 (Spring 2016)
Scholarly Contributions
Journals/Publications
- Fang, Y. C., Liang, C., Koshel, J., Sasian, J., Yatagai, T., Wang, Y., & Zavisian, J. M. (2015). Optical design and testing: introduction. Applied optics, 54(28), ODT1-2.More infoOptical design and testing have numerous applications in industrial, military, consumer, and bio-medical settings. This issue features original research ranging from the optical design of image and nonimage optical stimuli for human perception, optics applications, bio-optics applications, displays, and solar energy systems to novel imaging modalities from deep UV to infrared spectral imaging, a systems perspective to imaging, as well as optical measurement. In addition, new concepts and trends for optics and further optical systems will be especially highlighted in this special issue.
- Keresztes, J. C., De, K. B., Audenaert, J., Koshel, R. J., & Saeys, W. (2015). Illumination system development using design and analysis of computer experiments. NOVEL OPTICAL SYSTEMS DESIGN AND OPTIMIZATION XVIII, 9579.
- Koshel, R. J. (2015). Illumination system tolerancing. OPTICAL SYSTEM ALIGNMENT AND TOLERANCING, 6676.
- Koshel, R. J., & Mulder, S. (2015). Toleranced freeform optical design with extended sources using ray targeting. NOVEL OPTICAL SYSTEMS DESIGN AND OPTIMIZATION XVI, 8842.
- Keresztes, J. C., Koshel, R. J., Chipman, R., Stover, J. C., & Saeys, W. (2014). A cross-polarized freeform illumination design for glare reduction in fruit quality inspection.. OPTICAL SYSTEMS DESIGN 2015: ILLUMINATION OPTICS IV, 9629.
- Liang, C., Koshel, J., Sasian, J., Breault, R., Wang, Y., & Fang, Y. C. (2014). Optical design and testing: introduction. Applied optics, 53(29), ODT1-4.More infoOptical design and testing has numerous applications in industrial, military, consumer, and medical settings. Assembling a complete imaging or nonimage optical system may require the integration of optics, mechatronics, lighting technology, optimization, ray tracing, aberration analysis, image processing, tolerance compensation, and display rendering. This issue features original research ranging from the optical design of image and nonimage optical stimuli for human perception, optics applications, bio-optics applications, 3D display, solar energy system, opto-mechatronics to novel imaging or nonimage modalities in visible and infrared spectral imaging, modulation transfer function measurement, and innovative interferometry.
- Keresztes, J. C., Aernouts, B., Koshel, R. J., & Saeys, W. (2013). Dynamic noise corrected hyperspectral radiometric calibration in the SWIR range using a Supercontinuum laser. NOVEL OPTICAL SYSTEMS DESIGN AND OPTIMIZATION XVIII, 9579.
- Seassal, C., & Koshel, J. (2013). Focus issue introduction: renewable energy and the environment. Optics express, 21 Suppl 3, A430-2.More infoThis 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.
- Kim, J. J., & Koshel, R. J. (2010). Modeling Transflective LCD Illumination Systems. INTERNATIONAL OPTICAL DESIGN CONFERENCE 2010, 7652.
- Koshel, R. J., Seassal, C., Deparis, O., & Kumar, R. (2010). Focus issue introduction: Renewable energy and the environment 2013. OPTICS EXPRESS, 22(5), A561-A563.
- Koshel, R. J. (2008). Software conquers design and analysis of backlit LCDs. LASER FOCUS WORLD, 43(10), 62-+.
- Gregory, G. G., & Koshel, R. J. (2007). Introduction. NOVEL OPTICAL SYSTEMS DESIGN AND OPTIMIZATION XIII, 7787, IX-X.
- Koshel, R. J. (2007). A course in illumination engineering - art. no. 66680F. NOVEL OPTICAL SYSTEMS DESIGN AND OPTIMIZATION X, 6668, F6680-F6680.
- Koshel, R. J. (2007). Fractional Optimization of Illumination Optics. NOVEL OPTICAL SYSTEMS DESIGN AND OPTIMIZATION XI, 7061.
- Koshel, R. J. (2007). Why illumination engineering? - art. no. 667002. NONIMAGING OPTICS AND EFFICIENT ILLUMINATION SYSTEMS IV, 6670, 67002-67002.
- Gregory, G. G., & Koshel, R. J. (2006). Modeling the operating conditions of solar concentrator systems - art. no. 61970J. Photonics for Solar Energy Systems, 6197, J1970-J1970.
- Kintner, E. C., Wong, W. K., Jacobs, E. S., Cucchiaro, P. J., & Koshel, R. J. (2006). Efficient and versatile internal reference sources for remote sensing space telescopes - art. no. 62970F. Infrared Spaceborne Remote Sensing XIV, 6297, F2970-F2970.
- Koshel, R. J. (2006). Optimization of parameterized lightpipes - art. no. 63420P. International Optical Design Conference 2006, Pts 1 and 2, 6342, P3420-P3420.
- Koshel, R. J. (2005). Simplex optimization method for illumination design. Optics letters, 30(6), 649-51.More infoA modified simplex optimization method is developed for the design of illumination systems. The simplex method is a judicious choice for illumination optimization because of its robustness and convergence properties. To optimize the simplex method, its four parameters are adjusted dependent on the dimensionality of the space to converge with fewer iterations. This work is presented for the end game, when the optimizer is converging on a local optimum rather than searching for it. Up to a 37% reduction in the number of computations is realized. An example using a compound parabolic concentrator is compared between the standard and the modified simplex methods, providing over 22% improvement in the end game.
- Koshel, R. J., & Walmsley, I. A. (2004). Non-edge-ray design: improved optical pumping of lasers. OPTICAL ENGINEERING, 43(7), 1511-1521.
- Gupta, A., Lee, J., & Koshel, R. J. (2001). Design of Efficient LightPipes for Illumination by an Analytical Approach. Applied optics, 40(22), 3640-8.More infoWe present the concept of principal sections of a lightpipe to analyze the propagation of light through the lightpipe by total internal reflection. Only the principal sections determine the acceptance angle and thus help in the identification of regions where the leakage occurs first. Use of principal sections for analysis leads to a significant reduction in the design effort. We present an analysis of several commonly used lightpipe configurations, e.g., straight and single circular bend, and different cross sections, e.g., elliptical and rectangular. This analysis leads to the maximization of throughput and transfer efficiency. The uniformity characteristics of elementary configurations and scaling factors for a lightpipe with a single circular bend are also discussed.
- Koshel, R. J., & Walmsley, I. A. (1993). Modeling of the gain distribution for diode pumping of a solid-state laser rod with nonimaging optics. Applied optics, 32(9), 1517-27.More infoWe investigate the absorption distribution in a cylindrical gain medium that is pumped by a source of distributed laser diodes by means of a pump cavity developed from the edge-ray principle of nonimaging optics. The performance of this pumping arrangement is studied by using a nonsequential, numerical, three-dimensional ray-tracing scheme. A figure of merit is defined for the pump cavities that takes into account the coupling efficiency and uniformity of the absorption distribution. It is found that the nonimaging pump cavity maintains a high coupling efficiency with extended two-dimensional diode arrays and obtains a fairly uniform absorption distribution. The nonimaging cavity is compared with two other designs: a close-coupled side-pumped cavity and an imaging design in the form of a elliptical cavity. The nonimaging cavity has a better figure of merit per diode than these two designs. It also permits the use of an extended, sparse, two-dimensional diode array, which reduces thermal loading of the source and eliminates all cavity optics other than the main reflector.
- Blough, C. G., Bowen, J. P., Haun, N., Kindred, D. S., Koshel, R. J., Krill, D. M., Moore, D. T., Saxer, C. E., & Wang, D. Y. (1990). Effects of axial and radial gradients on Cooke triplets. Applied optics, 29(28), 4008-15.More infoThis study investigates the role of gradient-index materials in the design of Cooke triplets for use as 35-mm format photographic objectives. Cooke triplet designs are presented with different types of gradient-index profiles. Both linear axial and shallow radial gradients are shown to provide effective control of spherical aberration and astigmatism. In particular, a Cooke triplet with a combination of both linear axial and radial gradients attains performance comparable to a six-element double Gauss lens. In virtually all cases, the use of gradient-index components improves the Cooke triplets' performance significantly.