Broadband polarizing cube Beam splitter, 12.7 x 12.7 x 12.7 mm

Shape : CUBE
Efficiency
p-polarization transmission (Tp) >90% avg
s-polarization, reflection (Rs) >99.5% avg
Transmitted Beam Deviation: < = 5 arc min
Reflected Beam Deviation: 90° +-5 arc min

A beam splitter is an optical device that splits a beam of light in two. It is the crucial part of most interferometers.