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Mach-Zehnder interferometer
The Mach-Zehnder interferometer (named after physicists Ernst Mach and Ludwig Zehnder) is used to determine the phase shift caused by a small sample which is to be placed into one of the two collimated beams (thus having plane wavefronts) (then called sample beam (SB) as opposed to the reference beam (RB)) from a coherent light source.
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