title: Flat Fresnel doublets made of PMMA and PC: combining low cost production and very high concentration ratio for CPV.
abstract: The linear chromatic aberration (LCA) of several combinations of polycarbonates (PCs) and poly (methyl methacrylates) (PMMAs) as singlet, hybrid (refractive/diffractive) lenses and doublets operating with wavelengths between 380 and 1600 nm - corresponding to a typical zone of interest of concentrated photovoltaics (CPV) - are compared. Those comparisons show that the maximum theoretical concentration factor for singlets is limited to about 1000 × at normal incidence and that hybrid lenses and refractive doublets present a smaller LCA increasing the concentration factor up to 5000 × and 2 × 10(6) respectively. A new achromatization equation more useful than the Abbé equation is also presented. Finally we determined the ideal position of the focal point as a function of the LCA and the geometric concentration which maximizes the flux on the solar cell.
authors.affiliation: Hololab, Physics Department, Bat. B5a, Université de Liège, 17 allée du 6 Août, B-4000 Liège, Belgium. flanguy@ulg.ac.be
authors.forename: Fabian
authors.initials: F
authors.lastname: Languy
authors.forename: Karl
authors.initials: K
authors.lastname: Fleury
authors.forename: Cédric
authors.initials: C
authors.lastname: Lenaerts
authors.forename: Jérôme
authors.initials: J
authors.lastname: Loicq
authors.forename: Donat
authors.initials: D
authors.lastname: Regaert
authors.forename: Tanguy
authors.initials: T
authors.lastname: Thibert
authors.forename: Serge
authors.initials: S
authors.lastname: Habraken