Consider a beam splitter with two sides that has an input port and output port on each of its two sides that sends vertically-polarized photons through the first output port and sends horizontally-polarized photons through the second output port. A symmetric beam-splitter is a cube of glass which reflects half the light that impinges upon it, while allowing the remaining half to pass through unaffected. It is a crucial part of many optical experimental and measurement systems, such as interferometers, also finding widespread application in fibre optic telecommunications. This division allows for the simultaneous analysis or utilization of the light's properties along two separate paths. Light from an input fiber is first collimated, then sent through a beam splitting optic to divide it into two. This. Aligning the laser beam along the rails For the alignment along the rails, which carry the optical components of the first and second telescope system, one can use Ø1/2" mirrors (BB05-E02, Thorlabs) mounted on kinematic mounts (KM05/M, Thorlabs) and larger Ø1" corner mirrors (BB1-E02, Thorlabs).
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