page_title: Gires–Tournois etalon
hierarchical_section_title: Gires–Tournois etalon
caption_attribution_description: English: Schematic of a Gires-Tournois interferometer.
context_page_description: In optics, a Gires–Tournois etalon is a transparent plate with two reflecting surfaces, one of which has very high reflectivity, ideally unity. Due to multiple-beam interference, light incident on a Gires–Tournois etalon is completely reflected, but has an effective phase shift that depends strongly on the wavelength of the light.
  The complex amplitude reflectivity of a Gires–Tournois etalon is given by
  where r₁ is the complex amplitude reflectivity of the first surface,
  n is the index of refraction of the plate
  t is the thickness of the plate
  θₜ is the angle of refraction the light makes within the plate, and
  λ is the wavelength of the light in vacuum.
context_section_description: In optics, a Gires–Tournois etalon is a transparent plate with two reflecting surfaces, one of which has very high reflectivity, ideally unity. Due to multiple-beam interference, light incident on a Gires–Tournois etalon is (almost) completely reflected, but has an effective phase shift that depends strongly on the wavelength of the light.
  The complex amplitude reflectivity of a Gires–Tournois etalon is given by
  where r₁ is the complex amplitude reflectivity of the first surface,
  n is the index of refraction of the plate
  t is the thickness of the plate
  θₜ is the angle of refraction the light makes within the plate, and
  λ is the wavelength of the light in vacuum.
caption: Schematic of a Gires-Tournois etalon when light impinges at normal incidence on the first reflecting plate.
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