Examination of the Precision of a Quarter Wave Plate on the Poincare Sphere

概要

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Examination of quarter wave plate is carried out on the Poincare sphere for photoelastic experiments. The light intensity through an analyzer is given by coscos2 ρ, where ρ is the half angle between a incident polarized light and the analyzer on the Poincare sphere. Using proper quarter wave plates, a test piece with a birefringence δ gives the light intensity of sinsin2δ /2 in the dark field. If quarter wave plates have same error Δ, its intensity is coscos2Δ ·sinsin2δ /2. And if each plate has different error, its intensity error becomes more large depending stress direction. In addition, optical alignments in which these plates have dichromatic and rotary power are also investigated on the Poincare sphere. Both cases give few error to experimental result with commercial plates. It is more easy to discuss light intensities of photoelastic of photoelastic fringes on the Poincare sphere.
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