Diagram showing beam path in an uncompensated interferometer setup. (Please note, reflected beams are depicted offset for demonstrative purposes). Numbers refer to number of passes through the beamsplitter substrate. The blue beam (initially reflected at the beamsplitter) travels through the beamsplitter substrate three times, while the orange beam (initially transmitted through the beamsplitter) travels through the beamsplitter only once. This results in a differing path length and dispersion between the two beams once they arrive at the sensor.
With the addition of a compensator plate of the same thickness and refractive index of the beamsplitter, the orange beam now experiences the same change in path length and dispersion as does the blue beam.
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