Beamsplitter cube For sale tells you that the design of a beam splitter, the most common shape being a cube, is made of two triangular glass prisms glued together on a substrate using a polyester, epoxy, or polyurethane type adhesive. Beamsplitter cube For sale tells you that the thickness of the resin layer is adjusted so that half of the light (of a certain wavelength) incident through one "port" (ie, the face of the cube) is reflected and the other half is transmitted on due to total internal reflection.

Beamsplitter cube For sale tells you that another design uses a half-silvered mirror, a sheet of glass or plastic, with a clear thin metal coating, now usually made of aluminum vapor deposited aluminum. The thickness of the deposit is controlled so that the portion (typically half) of light incident at a 45-degree angle and not absorbed by the coating is transmitted and the remainder is reflected. Very thin half-silvered mirrors used for photography are often called pellicle mirrors.
Beamsplitter cube For sale tells you that To reduce the loss of light due to absorption by reflective coatings, so-called "Swiss cheese" beamsplitters have been used. Initially, these were sheets of highly polished metal that were perforated to achieve the desired reflectance-to-transmittance ratio. Afterward, the metal is either splashed onto the glass, creating a discontinuous coating, or small areas of continuous coating are removed chemically or mechanically to create a very literally "half-silvered" surface.
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