The physical mechanism for dividing a light beam relies on partial reflection and partial transmission at a specially treated optical interface. When light encounters this interface, a portion of the energy is reflected while the remaining portion is transmitted. 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. Splitters can split images two, three or even four times. Beam splitters are used in a wide range of fields, from teleprompters to robotics, impacting the technologies that we rely on daily. This article explains how beam splitters work, their types, and their. When integrated into specialised lenses, the beam splitter divides the incoming light into two paths: one beam illuminates the object, while the other is used for image capture.
