Babinet–Soleil compensator

The Babinet–Soleil compensator is a continuously variable, zero-order retarder consists of two birefringent wedges, one of which is movable, and another is fixed to a compensator plate.

The orientation of the long axis of the wedges is perpendicular to the long axis of the compensator plate.

It is named after Jacques Babinet and Jean-Baptiste Soleil.

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Babinet compensator
Schematic view of a Babinet–Soleil compensator