As in many other optical components, these bands are usually: 280-400nm for UV, 400-700 nm for visible, 700-1100nm for NIR, and 1100-1600 for IR. These beam splitters divide the incoming light into two beams with different polarizations. 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. Image Credit: Shanghai Optics Most plate beamsplitters are. Image from Tamasflex, CC BY-SA 3.