page_title: Common-path interferometer
section_title: Selected examples
hierarchical_section_title: Common-path interferometer / Selected examples
caption_attribution_description: English: Author: User:Stigmatella aurantiaca with material from User:D. mcfadden Source: Own work, created from Inkscape, with material from File:Fibre-optic-interferometer.svg, created by User:D. mcfadden Fair use rationale: File:Fibre-optic-interferometer.svg was licensed under Creative Commons Attribution-Share Alike 3.0 Unported and GFDL, allowing me to adapt the work into my own.
context_page_description: A common-path interferometer is a class of interferometers in which the reference beam and sample beams travel along the same path. Examples include the Sagnac interferometer, Zernike phase-contrast interferometer, and the point diffraction interferometer. A common-path interferometer is generally more robust to environmental vibrations than a "double-path interferometer" such as the Michelson interferometer or the Mach–Zehnder interferometer. Although travelling along the same path, the reference and sample beams may travel along opposite directions, or they may travel along the same direction but with the same or different polarization.
  Double-path interferometers are highly sensitive to phase shifts or length changes between the reference and sample arms. Because of this, double-path interferometers have found wide use in science and industry for the measurement of small displacements, refractive-index changes, surface irregularities and the like.
caption: Figure 1. Selected examples of common-path interferometers
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