beam splitter

noun Optics, Photography.
a mirror or prism that divides a beam of light into two parts by reflecting a part of the beam, used in camera range finders.

1930–35 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
beam splitter
a system that divides a beam of light, electrons, etc, into two or more paths

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
If the photons from the two ions are in the same state, the beam splitter will
  shunt both to one photodetector.
Optical beam splitter method compared to new method of controlling single
  electron spin.
The power is coupled from the laser by a beam splitter.
The beam of light produced by the light source is split into left and right
  beams by a beam splitter.
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