Geodesic lens: new designs for illumination engineering

Juan C. Miñano; Pablo Benítez; Bill Parkyn; Dejan Grabovickic; Fernando García; Asunción Santamaría; José Blen; Julio Chaves; Waqidi Falicoff

doi:10.1117/12.692271

3 August 2006 Geodesic lens: new designs for illumination engineering

Juan C. Miñano, Pablo Benítez, Bill Parkyn, Dejan Grabovickic, Fernando García, Asunción Santamaría, José Blen, Julio Chaves, Waqidi Falicoff

Author Affiliations +

Proceedings Volume 6342, International Optical Design Conference 2006; 634214 (2006) https://doi.org/10.1117/12.692271
Event: International Optical Design Conference 2006, 2006, Vancouver, BC, Canada

Abstract

A novel waveguide-optical integrator is introduced for applications to LEDs. The concept is based upon a Kohler illuminator made of Luneburg lenses. Typical Kohler illuminators are formed by pairs of thin lenses, and perform badly when the paraxial approximation is rough, i.e., when the angular span of the incoming rays is wide. In contrast, the new illuminator performs ideally for angular spans up to 90° (±45°), and has only a 3% loss for a 180° angular span. In general such an illuminator cannot be made in 3D, because adjacent Luneburg lenses overlap. It can, however, be implemented in planar optics, by using Rinehart geodesic lenses. This waveguide device has application in illumination engineering as a light mixer, particularly for LEDs. Another light mixer using a combination of two kaleidoscopes with a geodesic lens is also presented. Irradiance at the exit of a kaleidoscope has good light mixing if the kaleidoscope is long enough, but the intensity is never well mixed, irrespective of the length. Inserting a Rinehart geodesic lens produces a 90-degree phase-space rotation of the rays, i.e., it exchanges irradiance and intensity. An further kaleidoscope assures complete mixing in both irradiance and intensity.

Citation Download Citation

Juan C. Miñano, Pablo Benítez, Bill Parkyn, Dejan Grabovickic, Fernando García, Asunción Santamaría, José Blen, Julio Chaves, and Waqidi Falicoff "Geodesic lens: new designs for illumination engineering", Proc. SPIE 6342, International Optical Design Conference 2006, 634214 (3 August 2006); https://doi.org/10.1117/12.692271

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
12 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Light emitting diodes

Fiber optic illuminators

Lens design

Refractive index

Waveguides

Dielectrics

Illumination engineering

Show All Keywords

Keywords/Phrases

Search In:

Publication Years