The small size of the beam splitter allows it to directly mount to the front of any AvaSpec spectrometer or AvaLight Lightsource, eliminating the fibre interface. Another advantage is that your existing systems can be easily upgraded to a two- channel system. Beamsplitters are often classified according to their construction: cube or plate. 📦 For purchasing, use the RP Photonics Buyer's Guide for beam splitters. It provides an expert-curated supplier directory, buyer-focused technical background information, and structured selection criteria to support professional procurement decisions. What are Beam Splitters? A beam splitter (or. A beam splitter or beamsplitter is an optical device that splits a beam of light into a transmitted and a reflected beam. It is a crucial part of many optical experimental and measurement systems, such as interferometers, also finding widespread application in fibre optic telecommunications. This is usually done by applying a thin-film coating on a glass substrate and angling the element relative to the incoming light.