They operate with coherent or incoherent light, splitting by intensity, wavelength, or polarization. In its most common form, a cube, a beam splitter is made from two triangular glass prisms which are glued together at their base using polyester, epoxy, or urethane-based adhesives. (Before these synthetic resins, natural ones were used, e. ) The thickness of the resin layer is. This Beamsplitters Selection Guide outlines the core types of beamsplitters, explains how they work, and provides practical advice for choosing the best one for your application.