OPTI 380A Lab 5 - Linear Polarization - Presentation Slides-3

OPTI 380A Lab 5 - Linear Polarization - Presentation Slides-3

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1 OPTI 380A Intermediate Optics Lab 5: Linear Polarization Tom Milster Professor, College of Optical Sciences, University of Arizona [email protected] edu [email protected] Linearly Polarized EM Wave 9/24/2010 OPTI380A - Lab 5: Linear Polarization 2
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2 Polarizers ! A polarizer transmits only one orientation of polarization. That is, only one direction of electric field vibration is allowed to pass through the polarizer material. Unpolarized Light 9/24/2010 OPTI380A - Lab 5: Linear Polarization 3 Polarizer Polarized Light (Figure credit: http://en.wikipedia.org/wiki/File:Wire-grid-polarizer.svg) Absorptive Polarizers ! Wire-grid: parallel metallic wires ! Crystals: dichroism (two colored), preferential absorption of light polarized in one direction ! Polaroid film: polyvinyl alcohol (PVA) plastic with iodine doping, align PVA by stretching (common in sunglasses, 9/24/2010 OPTI380A - Lab 5: Linear Polarization 4 camera filters, LC displays) ! Corning Polarcor glass: elongated silver particles
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3 Polarizer Extinction Ratio ! A polarizer’s extinction ratio is the ratio of the power transmitted when the incident polarization is aligned with the transmission axis of the polarizer to the power transmitted when the incident polarization is orthogonal to the transmission axis.
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OPTI 380A Lab 5 - Linear Polarization - Presentation Slides-3

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