The GST1 event took place at the campus of the Universidad Politécnica de Madrid, Spain, from October 6-10, 2014 and was hosted by Professor Pablo Benitez from UPM.
During the GST1 the Early Stage Researchers (ESRs) were lectured on the basics of imaging and non-imaging theory of optics. Topics discussed were:
- Geometrical optics applied to both imaging and non-imaging systems
- Diffraction integrals, PSF and MTF
- Inverse problems
- Local and global system optimization
- Photometry and etendue invariants
- Design problems and methods in non-imaging optics
- Practical application examples, and use of commercial software
The first part of the week focused on imaging optics design. The objective was to give the ESRs a deep insight not only to the fundamentals, but also on the inherent complexity of the design problem. For that purpose, a general overview on methods for solving inverse problems was given to frame the presentation local optimization algorithms, the challenge of avoiding the traps of local minima, with special emphasys on the importance of the selection of a good starting design. It was also inportant to follow the resolution of examples using a commercial imaging software (Code V), to give the ESRs a close view to deal with specific practical problems.
The ESRs also had the oportunity to present their project plan and current status with the objective to be informed of their colleagues work, reinforce the network they form and find synergies in their respective research lines.
The second part of the week focused on non-imaging optics design, with specific reference to the similarities and differences with the imaging optics case. One of the main objectives was to give the ESRs a solid understanding of the basic limitations in non-imaging optics derived from etendue conservation principles, and the relevance of edge rays in extended source designs together with the power of point-source approximations. Also, it was targeted that the ESRs got a general view on the classification of the different nonimaging optics design problems, and the different methods available to solve them. Additionally, the ESRs were introduced to a hands-on practice in Excel of differential equation design, practical excersices solved by the trainer using a comercial nonimaigng software (LightTools), and examples in real products of solid state lighting.