This fiber-coupled Polarizing Beam Splitter 1 ⇾ 2 is a compact opto-mechanical unit that splits the radiation guided in the two linear principle states of a polarization-maintaining fiber into 2 output fiber cables with a high efficiency. 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. a laser beam) into two (or sometimes more) beams, which may or may not have the same optical power (radiant flux).