Fringe Refection method

... for qualification of shape accuracy of e. g. CSP mirrors (Concentrated Solar Thermal Power).

Concentrator Optics

R&D Services

Our wide-ranging expertise allows us to support customers wishing to use and optimize concentrator optics in the most varied applications. Our services range from fundamental investigations into optics and material properties through design and simulation of concentrators, to optical characterization using various set-ups of measuring instruments.

Investigations into soiling and degradation

Optical characterization and qualification

Design and optimization of concentrator optics



Concentrator optics concentrate incident radiation onto thermal or photovoltaic receivers. We investigate and develop single stage and multistage concentrator designs based on reflective (e.g. parabolic mirrors, heliostats) or refractive optics (e.g. Fresnel lenses or dielectric secondary concentrators) for linear or spot focusing systems in low, medium and high concentration applications.

Applications are concentrating collectors for solar thermal power plants (CSP) and optical systems for concentrator photovoltaics (CPV). Further information can be found in our Center for Optics and Surface Science and in the Research Topic III-V and Concentrator Photovoltaics.



Selected Research Projects



Highly efficient concentrator module with GaSb-based four-junction solar cell


Receiver and Systems for Low-Concentrating PV (LCPV)


Very Low Angle Beam Spread in PMMA after up to 27 Years as Concentrator Lens in the Sun


Current publications - Concentrator Optics:

YearTitle/AuthorDocument Type
2018Challenges in the Design of Concentrator Photovoltaic (CPV) Modules to Achieve Highest Efficiencies
Wiesenfarth, M.; Anton, I.; Bett, A.W.
Journal Article
2018Operation & maintenance - the key for reliable performance in a CPV power plant
Wüllner, Johannes; Steiner, Marc; Wiesenfarth, Maike; Bett, Andreas
Conference Paper
2018Systematic design evaluation on the example of a concentrator photovoltaic module with mirror optics and passive heat dissipation
Wiesenfarth, Maike; Gamisch, Sebastian; Jakob, Peter; Steiner, Marc; Bett, Andreas
Journal Article
2018Trends in Solar Electricity: Presentation held at EuroSun, 12th International Conference on Solar Energy for Buildings and Industry 2018, Rapperswil, Switzerland, September 11th, 2018
Bett, A.W.
2018Verbesserungspotentiale für Silikonoptiken in der konzentrierenden Photovoltaik
Jakob, Peter; Reinecke, Holger (Referent); Glunz, Stefan W. (Referent); Nitz, Peter Markus (Betreuer)
201643 % direct sunlight conversion efficiency using 4J cell with achromatic full glass lens
Steiner, M.; Siefer, G.; Schmidt, T.; Wiesenfarth, M.; Dimroth, F.; Bett, A.W.
Conference Paper
2016CPV-T Mirror Dish System Combined with Water Desalination Systems
Wiesenfarth, M.; Went, J.; Bösch, A.; Dilger, A.; Kec, T.; Kroll, A.; Koschikowsi, J.; Bett, A.W.
Conference Paper
2016Rating of CPV modules: Results of module round robins
Steiner, Marc; Siefer, Gerald; Baudrit, Mathieu; Askins, Stephen; Domínguez, César; Antón, Ignacio; Roca, Francesco; Fucci, Raffaele; Cancro, Carmine; Romano, Antonio; Graditi, Giorgio; Pugliatti, Paola Maria; Stefano, Agnese di; Kenny, Robert; Norton, Matthew; Minuto, Alessandro; Morabito, Paolo; Muller, Matthew; Riley, Daniel; Pratt, Larry
Conference Paper
2016Slope-deviation measurement of Fresnel-shaped mold surfaces
Kiefel, P.; Hornung, T.; Nitz, P.; Reinecke, H.
Journal Article
2015Calibration function for an experimental setup for the measurement of irradiance distributions via a transmitting diffuser
Schmid, T.; Hornung, T.; Nitz, P.
Journal Article
2015Challenges and perspectives of CPV technology: Presentation held at 42nd IEEE Photovoltaic Specialists Conference 2015, New Orleans, USA, 14.06.2015-19.06.2015
Bett, A.W.
2015CPV module with fresnel lens primary optics and homogenizing secondary optics
Wiesenfarth, M.; Dörsam, T.; Eltermann, F.; Hornung, T.; Siefer, G.; Steiner, M.; Riesen, S. van; Neubauer, M.; Boos, A.; Wanka, S.; Gombert, A.; Bett, A.W.
Conference Paper
2015The distance temperature map as method to analyze optical properties of Fresnel lenses and their interaction with multi-junction solar cells
Hornung, T.; Kiefel, P.; Nitz, P.
Conference Paper
2015NGCPV: A new generation of concentrator photovoltaic cells, modules and systems (a final review)
Datas, A.; Cristóbal, A.B.; Sala, G.; Anton Hernandez, I.; Minano, J.C.; Benítez, P.; Algora, C.; Bett, A.W.; Lackner, D.; Niemeyer, M.; Philipps, S.P.; Siefer, G.; Ekins-Daukes, N.J.; Roca, F.; Cancro, C.; Luque-Heredia, L.; Warmuth, W.; Baudrit, M.; Okada, Y.; Sugiyama, M.; Hishikawa, Y.; Takamoto, T.; Araki, K.; Fukuyama, A.; Nishioka, K.; Suzuki, H.; Kuze, N.; Moriyasu, Y.; Kita, T.; Kotagiri, A.; Kojima, N.; Martí Vega, A.; Yamaguchi, M.; Luque, A.
Conference Paper
2015Silicone on glass fresnel lenses
Hornung, T.
Book Article
2015Specularity of concentrator mirrors for CPV measured with VLABS
Schmid, T.; Heimsath, A.; Hornung, T.; Nitz, P.
Conference Paper
2015Technical analysis and optimization of a high concentrating photovoltaic power tower
Ordóñez Moreno, K.; Heimsath, A.; Wiesenfarth, M.; Schöttl, P.; Nitz, P.
Conference Paper
2014Light diffraction by concentrator Fresnel lenses
Hornung, T.; Nitz, P.
Journal Article
2014Mass Manufactured Secondary Optics for CPV
Schmid, T.; Wiesenfarth, M.; Bösch, A.; Hornung, T.; Gremmelspacher, M.; Manns, P.
Conference Paper
2014Measurement of small angle ray deviations for concentrating solar applications: Circumsolar radiation and mirror beam spread
Nitz, P.; Schmid, T.; Schmidt, T.; Hornung, T.; Heimsath, A.
Conference Paper
2014Monochromatic Collimated Light Source for an Indoor Lens Efficiency Tester
Kiefel, P.; Leipersberger, A.; Schmidt, T.; Hornung, T.
Conference Paper
2014Optical Loss Due to Diffraction by Concentrator Fresnel Lenses
Hornung, T.; Nitz, P.
Conference Paper
2014Scientific System for High-resolution Measurement of the Circumsolar Radiation
Schrott, S.; Schmidt, T.; Hornung, T.; Nitz, P.
Conference Paper
2013Analysis of high concentration passively cooled CPV module designs using mirror optics
Dreger, M.; Wiesenfarth, M.; Schmid, T.; Bett, A.W.
Conference Paper
2013Indoor characterization of reflective concentrator optics
Schmid, T.; Frick, M.; Hornung, T.; Nitz, P.
Conference Paper
2013NGCPV: A new generation of concentrator photovoltaic cells, modules and systems
Datas, A.; Cristóbal, A.B.; Sala, G.; Anton, I.; Minano, J.C.; Benítez, P.; Bett, A.W.; Siefer, G.; Ekins-Daukes, N.J.; Roca, F.; Cancro, C.; Luque-Heredia, I.; Warmuth, W.; Baudrit, M.; Okada, Y.; Sugiyama, M.; Hishikawa, Y.; Takamoto, T.; Araki, K.; Fukuyama, A.; Nishioka, K.; Suzuki, H.; Kuze, N.; Moriyasu, Y.; Kita, T.; Kotagiri, A.; Kojima, N.; Marti, A.; Yamagucchi, M.; Luque, A.
Conference Paper
This publication list has been generated from the publication database Fraunhofer-Publica.