26 April 2002 Polarization recovery system based on light pipes
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Abstract
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.
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Markus Duelli, Markus Duelli, Tony D. McGettigan, Tony D. McGettigan, Clark A. Pentico, Clark A. Pentico, } "Polarization recovery system based on light pipes", Proc. SPIE 4657, Projection Displays VIII, (26 April 2002); doi: 10.1117/12.463789; https://doi.org/10.1117/12.463789
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