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Moving the beam splitter increases

Put the concave lens between the laser and the beam splitter to expand the laser beam. Be sure the laser beam passes through the center of the lens. You should now see interference fringes. A beam splitter or beamsplitter is an optical device that splits a beam of light into a transmitted and a reflected beam. It is a crucial part of many optical experimental and measurement systems, such as interferometers, also finding widespread application in fibre optic telecommunications. Classically, an incident beam with an amplitude A1 is split into a reflected beam with the A1 amplitude and a. The theory of the beam splitter (BS) in quantum optics is well developed and based on fairly simple mathematical and physical foundations.