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Sagnac Interferometer with Three Mirrors

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This Demonstration simulates the operation of a Sagnac interferometer with three mirrors and two input beams. The interference between the output beams depends on the placement of the components. This differs from the two-mirror Sagnac interferometer in that the output beams are no longer in parallel when the mirrors are tilted.

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For comparison, see the Demonstration "Sagnac Interferometer". This three-mirror Sagnac-loop is widely used in measurement of weak signals, as a super MZ interferometer, and so on, in experimental quantum optics.

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Contributed by: Ruibo Jin (December 2013)
Open content licensed under CC BY-NC-SA

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For more details about the Sagnac interferometer, refer to the Wikipedia entry for "Sagnac Effect".

To see an experimental two-mirror Sagnac-loop, see R.-B. Jin, et al., "Pulsed Sagnac Polarization-Entangled Photon Source with a PPKTP Crystal at Telecom Wavelength." arxiv.org/abs/1311.3462.

To see an experimental three-mirror Sagnac-loop, see T. Nagata, et al., "Beating the Standard Quantum Limit with Four Entangled Photons." arxiv.org/abs/0708.1385.

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