18 First-stage beam splitter
The BST18 from Thorlabs Inc is a Beam Splitter with Beamsplitter Diameter 50. 8 mm (2 Inch), Beamsplitter Thickness 8 mm, Wavelength Range 1200 to 1600 nm. Our plate beamsplitters have a coated front surface that determines the beam splitting ratio while the back surface is wedged and AR coated in order to minimize ghosting and interference effects. a laser beam) into two (or sometimes more) beams, which may or may not have the same optical power (radiant flux). 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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