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Beam splitter
Optical device which splits a beam of light in two / From Wikipedia, the free encyclopedia
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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.
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![](http://upload.wikimedia.org/wikipedia/commons/thumb/7/7d/Beam-splitter.svg/255px-Beam-splitter.svg.png)
1 - Incident light
2 - 50% transmitted light
3 - 50% reflected light
In practice, the reflective layer absorbs some light.
![](http://upload.wikimedia.org/wikipedia/commons/thumb/0/0a/Beamsplitter-2.jpg/320px-Beamsplitter-2.jpg)