 Wollaston Polarizers by B. Halle Nachfl. GmbH

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.