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In optics, a Fabry–Pérot interferometer (FPI) or etalon is an optical cavity made from two parallel reflecting surfaces (i.e.: thin mirrors). Optical waves can pass through the optical cavity only when they are in resonance with it. It is named after Charles Fabry and Alfred Perot, who developed the instrument in 1899.
Marie Paul Auguste Charles Fabry ForMemRS [1] [2] (French: [maʁi pɔl oɡyst ʃaʁl fabʁi]; 11 June 1867 – 11 December 1945) was a French physicist working on optics. [3] [4] Together with Alfred Pérot he invented the Fabry–Pérot interferometer. He is also one of the co-discoverers of the ozone layer.
The plane-parallel resonator is also the basis of the Fabry–Pérot interferometer. For a resonator with two mirrors with radii of curvature R 1 and R 2, there are a number of common cavity configurations. If the two radii are equal to half the cavity length (R 1 = R 2 = L / 2), a concentric or spherical resonator results.
Figure 1. The light path through a Michelson interferometer.The two light rays with a common source combine at the half-silvered mirror to reach the detector. They may either interfere constructively (strengthening in intensity) if their light waves arrive in phase, or interfere destructively (weakening in intensity) if they arrive out of phase, depending on the exact distances between the ...
In a Fabry–Pérot interferometer [3] or etalon, the wavelength separation between adjacent transmission peaks is called the free spectral range of the etalon and is given by Δ λ = λ 0 2 2 n l cos θ + λ 0 ≈ λ 0 2 2 n l cos θ , {\displaystyle \Delta \lambda ={\frac {\lambda _{0}^{2}}{2nl\cos \theta +\lambda _{0}}}\approx {\frac ...
Fabry–Pérot interferometer; Fizeau interferometer; Fourier-transform interferometer; Fresnel interferometer (e.g. Fresnel biprism, Fresnel mirror or Lloyd's mirror) Fringes of Equal Chromatic Order interferometer (FECO) Gabor hologram; Gires–Tournois etalon; Heterodyne interferometer (see heterodyne) Holographic interferometer; Jamin ...
Jean-Baptiste Alfred Perot (French:; 3 November 1863 – 28 November 1925) was a French physicist. Together with his colleague Charles Fabry he developed the Fabry–Pérot interferometer in 1899. [1] [2] The French Academy of Sciences awarded him the Janssen Medal for 1912. [3] The Royal Society awarded Fabry and Perot the Rumford medal in 1918.
Thus, Brillouin scattering can be used to measure the energies, wavelengths and frequencies of various atomic chain oscillation types ('quasiparticles'). To measure a Brillouin shift a commonly employed device called the Brillouin spectrometer is used, the design of which is derived from a Fabry–Pérot interferometer. Alternatively, high ...