Calendar of Events

Week of November 17 2019

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Monday, November 18, 2019 - 3:00pm
Description

Dissertation Title:Selected Topics in Novel Optical Design

Committee:

Dr. Jose Sasian (chair)
Dr. Jim Schwiegerling
Dr. Rongguang Liang

Abstract:

This dissertation discusses several selected topics in novel optical design and engineering, including photographic fisheye lens design for 35mm format cameras, miniature camera lens design with a freeform surface, applications and optical performance consideration of liquid lenses.

For the topic of photographic fisheye lens design for 35mm format cameras, a detailed discussion on design and optimize photographic fisheye lenses is provided. Fundamentals of fisheye lenses, such as the history, different fisheye projection methods with mathematical derivation, unique properties and design issues for fisheye lenses are discussed. Design methods of a zoom fisheye lens are also introduced. Aberration control of a two-group zoom lens is explained from a novel perspective and a large aperture zoom fisheye lens for 35mm DSLR cameras with good optical performance is presented.

For the topic of miniature camera lens design, the author first reviews design challenges and current aspherical surfaces that are being used for miniature camera lenses. Then a freeform surface based on pedal curve to the ellipse is presented and explained in detail. Optical performance of two sets of miniature lenses with similar structure but different surface types are evaluated. Evaluations show that miniature camera lenses designed with pedal surfaces are not only better in nominal performance, but also have much better tolerance performance. Such designs have great potential to increase yield for highly demanded miniature cameras.

For the last topic, different applications based on liquid lenses are presented with author designed examples. Then optical performance of 3D microscopy based on liquid lenses are evaluated in both optical simulation and lab experiment. High impact to image quality from gravity is observed. Chromatic aberration is also realized in both simulation and experiment results. A novel method to correct axial chromatic aberration for liquid lens at different power setting is then presented with some achromatic and apochromatic example optical systems.

 
 
Wednesday, November 20, 2019 - 12:00pm
Description

A Discussion with James C. Wyant College of Optical Sciences Professor Hong Hua and Gary Foster of eSight

Lunch will be provided for advance registrants.
 
For those who are legally blind or have impaired eyesight, low vision has an immense impact on an individual’s mobility, independence, ability to function in the world and quality of life.
 
Professor Hong Hua, recognized for her research in innovative 3D display technologies, complex visualization systems and novel image acquisition systems, worked with graduate student Jason Kuhn to develop a technology that has enabled the creation of the latest generation of best-in-class near-eye optics.
 
Working with Tech Launch Arizona, the University patented the technologies and licensed them to eSight Corporation.
 
Join us for lunch and a discussion with Professor Hua, hear her story and learn what it takes to take ideas from the lab to the world for maximum impact. 
 
Gary Foster, one of eSight’s most prolific users and Customer Success Team Manager, will be speaking about the impact eSight has had on his life, and the lives of those around him. Gary will be joining us via Zoom.

Kennedy Nyairo, TLA Sr. Licensing Manager for the College of Optical Sciences, will moderate our discussion.

Who should attend?

While this talk will be geared toward faculty, researchers, graduate students and staff, all are welcome.  

Lunch will be provided for advance registrants, sign up using the form on this page. Thank you! 
 
Event Contacts:
Ellen Ogley
Adminsitrative Associate
520-621-7262
 
Thursday, November 21, 2019 - 3:00pm
Description

Dissertation Title: Applications of Eikonals in Optical Design

Committee:

Dr. John Koshel (chair)
Dr. Russell Chipman
Dr. Rongguang Liang

Abstract:

The polynomial fit eikonal can characterize any complex surface by converting a ray trace of the system into a phase space transformation. This phase space transformation provides the information required to define the radiance throughout the system. The characterization of the radiance throughout the system means that the eikonal can be used in lieu of a conventional ray trace. The initial computation time needed to create the polynomial fit eikonal of a surface can be high and the eikonal representation is not as accurate as a real ray trace of a system. However, in contrast to real ray traces, the polynomial fit eikonal provides more flexibility. For example, if a full optical system has each of its surfaces converted into eikonals, then any polynomial fit eikonal surface can be exchanged with any other polynomial fit eikonal surface without needing to run cumbersome ray traces. Furthermore, once the surface is fully characterized, the eikonal does not need to be recreated as the system changes. Computation time is thus faster overall for eikonal surfaces than for real ray traces. The eikonal becomes more accurate as more terms are included. This increase in accuracy is due to higher order terms of the eikonal fitting higher order optical aberrations.

This dissertation explores how various optical factors, such as curvature and refractive index, affect the accuracy of the eikonal fit. Whenever an eikonal fit is performed, it is not guaranteed to be accurate enough for the application at hand, so error reduction is an important factor when building eikonal surfaces. As the system’s étendue increases, it becomes harder to fit the system to a single eikonal with reasonable error. In this case, it can be advantageous to split the system’s étendue into smaller, more manageable sections to reduce the error of the eikonal. For systems with complex sources, the source can be compiled into a probability density function. This probability density function allows for the characterization of a source into a continuous function using a ray set as the basis. Rays can then be interpolated by a random weighted drawing of new rays from the probability density function and then propagated through the optical system using the eikonal.

 
Thursday, November 21, 2019 - 3:30pm - 5:00pm
Description

Speaker: Grover Swartzlander 

Topic: Diffractive Light Sails and Beam Riders

Host: Rolf Binder

Visit our website for future lecture dates and speaker information: http://www.optics.arizona.edu/news-events/events/colloquium For a list of our archived lectures: http://www.optics.arizona.edu/news-events/events/colloquium/archive

 
Friday, November 22, 2019 - 11:00am - 1:00pm
Description

Wear your best Hawaiian gear and say “Aloha” to the weekend. Refreshing beverages, sweet treats, and prizes for those expressing the aloha spirit.