A beam splitter reflects some of the infrared light and lets the rest pass through. It is a crucial part of many optical experimental and measurement systems, such as interferometers, also finding widespread application in fibre optic telecommunications. Beamsplitters are often classified according to their construction: cube or plate. A beam splitter (or beamsplitter, power splitter) is an optical device which can split an incident light beam (e. Different types of beam splitters exist, as described in the. Explore the precision, applications, and design principles of beam splitters, essential for advancements in scientific research and technology. Electric elds E1 and E2 enter input ports 1 and 2.