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26 April 2002 Polarization recovery system based on light pipes
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Proceedings Volume 4657, Projection Displays VIII; (2002)
Event: Electronic Imaging, 2002, San Jose, California, United States
With the availability of small arc size high intensity discharge lamps a new polarization recovery system using polarization recycling in a light pipe is made possible. Combining light integration/homogenization with polarization recovery in an integrator rod leads to cost reduction and smaller light engines. The polarization recovery light pipe utilizes a reflective polarizer that works at normal incidence at its exit face and a high-reflective mirror with a transparent circular aperture at the entrance face. The reflected linearly polarized light is recycled by rotating its polarization by 90 degree(s) during one round-trip in the integrator rod. Different possibilities for achieving this polarization rotation, including retarders and phase control coatings are investigated. As much as 70% of the rejected polarized light can be recaptured with this system.
© (2002) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Markus Duelli, Tony D. McGettigan, and Clark A. Pentico "Polarization recovery system based on light pipes", Proc. SPIE 4657, Projection Displays VIII, (26 April 2002);

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