They are widely used in interferometry, microscopy, laser systems, imaging devices, quantum optics, and semiconductor inspection. Depending on the application, engineers can select from cube beamsplitters, plate beamsplitters, polarizing beamsplitters, and non-polarizing. 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. Additionally, beamsplitters can be used in reverse to combine two different beams into a single one. This passive device uses a specialized surface designed to both reflect and transmit light simultaneously. a laser beam) into two (or sometimes more) beams, which may or may not have the same optical power (radiant flux).
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