Optical performance of a versatile illumination system for high divergence LED sources

Abstract: Abstract An efficient flat-top illuminating optical system optimized for an extended light source is presented. The source is a high-brightness high divergence light emitting diode (LED), sized 1 mm × 1 mm, producing monochromatic emission (525 ± 5 nm) with viewing angle of 130°. The design is based on a rotationally symmetrical catadioptric system, developed on a geometrical optics basis, and modelled with ZEMAX® software. The device consists of two optical systems: (i) a collimating system which, in turn, is formed by an aspheric lenses system (low numerical apertures, NA < 0.26) and two-mirror system (0.26 < NA < 0.86), and (ii) an external mirror (NA > 0.86) designed and optimized for each purpose. By itself, the collimating system works with a residual divergence of ?C = 1.46°. The external mirror can be adequately designed to produce some given conditions. For instance, a flat-top profile is obtained in the selected focusing plane, with a maximum transversal intensity variation of 2.5% over 18 mm. In addition, when the focusing mirror is allowed to move along the optical axis in a ±1 mm range, other interesting profiles can be reached for a given working distance, therefore increasing the versatility of the system.

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 Fuente: Optik - International Journal for Light and Electron Optics, Volume 125, Issue 5, March 2014, Pages 1657–1662

Editorial: Elsevier

 Fecha de publicación: 01/03/2014

Nº de páginas: 6

Tipo de publicación: Artículo de Revista

 DOI: 10.1016/j.ijleo.2013.09.064

ISSN: 0030-4026,1618-1336

Url de la publicación: https://doi.org/10.1016/j.ijleo.2013.09.064