page_title: Beam splitter
hierarchical_section_title: Beam splitter
caption_attribution_description: English: Beam splitter.
context_page_description: A beam splitter is an optical device that splits a beam of light in two. It is a crucial part of many optical experimental and measurement systems, such as interferometers, also finding widespread application in fibre optic telecommunications.
context_section_description: A beam splitter (or beamsplitter) is an optical device that splits a beam of light in two. It is a crucial part of many optical experimental and measurement systems, such as interferometers, also finding widespread application in fibre optic telecommunications.
caption: Schematic illustration of a beam splitter cube.
   1 - Incident light
   2 - 50% Transmitted light
   3 - 50% Reflected light
   In practice, the reflective layer absorbs some light.
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