Chinese Optics Letters, Vol. 13, Issue 9, 092201 (2015)
Light losses in hollow, prismatic light guides related to prism defects: a transmittance model
Berta García-Fernández1,*, Daniel Vázquez-Moliní1, Antonio Álvarez Fernández-Balbuena1,2, Angel García-Botella2, and Juan Carlos Martínez Antón1
- 1Department of Optics, Faculty of Optics and Optometry, University Complutense of Madrid, Spain
- 2Department of Physics Applied to Natural Resources, School of Forestry Engineering, Polytechnic University of Madrid, Spain
Hollow, cylindrical, prismatic light guides (CPLGs) are optical components that, using total internal reflection (TIR), are able to transmit high-diameter light beams in daylight and artificial lighting applications without relevant losses. It is necessary to study the prism defects of their surfaces to quantify the behavior of these optical components. In this Letter, we analyze a CPLG made of a transparent dielectric material. Scanning electron microscopy (SEM) and the topographic optical profilometry by absorption in fluids (TOPAF) imaging technique are conducted to determine if there are defects in the corners of the prisms. A model for light guide transmittance that is dependent on prism defects is proposed. Finally, a simulation and an experimental study are carried out to check the validity of the proposed model.