= Wollaston Polarizers by B. Halle Nachfl. GmbH
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https://www.b-halle.de/products/polarizers/wollaston_polarizers.html
Manufacturer technical description, opening paragraphs: identically shaped birefringent prisms with orthogonal crystal axes, divergent orthogonally polarized output beams, calcite/quartz implementations, and full output-angle convention. General specifications distinguish cemented calcite prisms from optically contacted quartz prisms. Technical construction and angle convention are cited; no catalog prices are relied on.
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