Person:
Álvarez Fernández-Balbuena, Antonio

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First Name
Antonio
Last Name
Álvarez Fernández-Balbuena
URI
https://hdl.handle.net/20.500.14352/79920
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Óptica y Optometría
Department
Óptica
Area
Optica
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    Improved spatial integrator with axicon-dioptric elements
    (Optical Engineering, 2006) Álvarez Fernández-Balbuena, Antonio; Vázquez Molini, Daniel; Alda, Javier; Bernabeu Martínez, Eusebio
    The flux transfer efficiency of an optical array with spatial integration has been improved by adding a new element at the input surface. The optical characteristics of the input surfaces of the individual units do not affect the spatial integration property. We propose to fill this input surface with a nested optical array designed to transfer as much energy as possible to the plane of the synthetic image of the spatial integrator array. Several designs for the individual units of this array are discussed. The most promising design consists of a cylindrical axicon-diopter element. This element has been simulated, fabricated, and tested, showing the expected improvement in performance.
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    High efficiency 90° elbow for light guides
    (Nonimaging Optics and Efficient Illumination Systems V, 2008) Vázquez Moliní, Daniel; Álvarez Fernández-Balbuena, Antonio; García Fernández, Berta; Bernabeu Martínez, Eusebio; Winston, Ronald; Koshel, R. John
    Transmission of light through a 90 degrees elbow in a hollow light guide is an important step in the development of natural lighting applications. In this paper we present a new design that has more than 260% higher efficiency in flux transfer than a standard bending system for hollow and aluminum light guides. The clue of this new system is to minimize the light angle at the output of the elbow, in such way that it is possible to guide light at higher distances because of the fewer reflections in the light guide. The system works properly for prismatic light guides but is also suitable for aluminum guides where the reduction of reflections permit the use of cheaper aluminum or the increase in length maintaining flux transfer. Also this reduction of reflections in aluminum light guide derives in less change of chromatic coordinates.