title: Microstructured light guides overcoming the two-dimensional concentration limit.
abstract: Light guides are employed to homogenize an illumination distribution, to translate cross-sectional beam shapes, and to provide concentration. Microstructures enhance the performance of light guides based on the selective mixing of direction vector components in the two-dimensional phase space (etendue) that is perpendicular to the system's optical axis. For linear concentrators we find that the microstructured light guide beats the two-dimensional concentration limit and roughly allows for a three-dimensional concentration ratio. This result is verified in simulation and experiment.
authors.affiliation: Department of Physics, Philipps University, Renthof 5, 35037 Marburg, Germany. ralf.leutz@physik.uni-marburg.de
authors.forename: Ralf
authors.initials: R
authors.lastname: Leutz
authors.forename: Harald
authors.initials: H
authors.lastname: Ries