Nonimaging Optics Minisymposium
Online Minisymposium
Monday, December 8, 2025 • 15:00 - 17:00 CET
Thank you for joining our online minisymposium where we kicked off the next Nonimaging Optics conference with selected invited talks, the launch of the call for papers, and the introduction of the 2026 optical design competition.
Program and Recordings
Opening and announcement of call for papers
(Invited) Models using optimal mass transport for inverse design in nonimaging optical systems
(Invited) Measurements in the phase space
Optical Design Competition Launch
Additional context on the 1995 design challenge mentioned in this presentation: This was one of two challenges communicated by Roland Winston in the introduction to the 1995 conference proceedings. The text of this challenge was written by Dr. Narkis Shatz (with contributions from Dr. John Bortz)… , and the challenge was motivated by the work presented by Shatz and Bortz at the same conference [1]. In their paper, they use inverse engineering to design concentrators and projectors that outperform the compound parabolic concentrator in 3D. Their optimized designs were still not 100% ideal. The cause of this nonideality was an unresolved mystery at the time and led to the formulation of the 1995 design challenge.
[1] Narkis E. Shatz, John C. Bortz, "Inverse engineering perspective on nonimaging optical design," Proc. SPIE 2538, Nonimaging Optics: Maximum Efficiency Light Transfer III, (21 August 1995); https://doi.org/10.1117/12.216977
Closing Remarks
Want More Nonimaging Optics?
Join us in San Diego in August 2026! Call for papers is now live.
View Call for PapersInvited Speakers
Martijn Anthonissen
Eindhoven University of Technology, Computational Illumination Optics Group
Martijn Anthonissen works at Eindhoven University of Technology in the Computational Illumination Optics group. This is one of the few mathematics groups worldwide working on optical design problems from illumination optics.
The team has a healthy portfolio of PhD positions and close collaborations with industrial partners. The research focuses on nonimaging freeform optics, imaging optics and improved direct methods.
Julius Muschaweck
JMO GmbH
Julius Muschaweck, a German physicist, has been working on optical design for illumination for almost thirty years. After a stay as Visiting Scholar at the University of Chicago with Prof. Roland Winston (well known as the originator of Nonimaging Optics), he was co-founder and CEO of OEC, an optical engineering service which pioneered freeform optics for illumination.
Later, at OSRAM, where he held the position of Senior Principal Key Expert, he coordinated the over 100 optical designers within OSRAM worldwide. He then joined ARRI, the leading movie camera and lamp head maker, as Principal Optical Scientist.
Julius Muschaweck now works as an independent consultant, providing illumination optics solutions to industry clients, teaching courses on illumination optics, and writing about the subject. He is the author of over 25 scientific papers and the inventor of over 50 patent applications. He also loves to go hiking with his wife and their dogs.
If you're interested in more about Julius and his online courses, see jmoptics.de.
Henning Rehn
Owner and Optical Designer, Illuminatio Solutions GmbH
Henning Rehn is a physicist and optical engineer with extensive experience in R&D management and optical design. He received his PhD in Applied Optics from Friedrich-Schiller-University in Jena, Germany in 1995, where he had studied physics and also completed postdoctoral work.
His professional career includes positions as optical engineer and project manager at Carl Zeiss Jena (1998-2001), projector lamp development at OSRAM Berlin (2001-2007), R&D Manager for LED products at OSRAM (2007-2013), and Principal Key Expert in Optical Design at OSRAM (2013-2018). He then served as Team Leader of the Optical Design Group at FISBA AG in St. Gallen (2018-2025).
In 2025, Dr. Rehn founded Illuminatio Solutions GmbH, where he continues his work in optical design as owner and optical designer.