skip to main content

Title: Coating considerations for mirrors of CPV devices

One of the different optical concepts for concentrator devices is to place a focussing primary mirror behind a transparent front plate. In addition (also in case of Fresnel-diffractive main optics), further 'secondary' reflectors may be used further along the beam path. Such mirrors are usually implemented as coating stacks of a highly reflective metal - usually silver - and protective layers. The protective layers are preferably designed as reflection enhancing interference stack. The design of such protective layer stacks yields two difficulties, which are addressed in this paper: (a) vacuum coating of three-dimensional parts will result in a thickness distribution and the optical design of the stack should thus be tolerant to layer thickness variations, and (b) different places of the mirror will have different angle-of-incidence of the sunlight under operating conditions. As result, the layer stack has a different design at different places of the mirror.
Authors:
; ;  [1]
  1. Leybold Optics GmbH, Siemensstr. 88, D-63755 Alzenau (Germany)
Publication Date:
OSTI Identifier:
22307890
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1616; Journal Issue: 1; Conference: CPV-10: 10. international conference on concentrator photovoltaic systems, Albuquerque, NM (United States), 7-9 Apr 2014; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; DESIGN; INCIDENCE ANGLE; INTERFERENCE; LAYERS; MIRRORS; OPTICS; PHOTOVOLTAIC CONVERSION; REFLECTION; SILVER; SOLAR CELLS; SOLAR CONCENTRATORS; SOLAR RADIATION; THICKNESS; THREE-DIMENSIONAL CALCULATIONS; VACUUM COATING