En óptica, un interferómetro de Fabry-Pérot, o Etalon está, normalmente, constituido por una placa con dos superficies reflectantes, o dos espejos paralelos. volo per applicazioni in campo astronomico da satellite. Viene presentato l’ interferometro di. Fabry-Pérot all’interno del quadro degli spettroscopi per uso. Media in category “Fabry-Pérot interferometer”. The following 37 files are in this category, out of 37 total. Airy distribution of a Fabry-Perot.

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It is named after Charles Fabry and Alfred Perotwho developed the instrument in To within interferomeyro constant multiplicative phase factor, the amplitude of the m th transmitted beam can be written as:.

Etalons with high finesse show sharper transmission peaks with lower minimum transmission coefficients. The phase difference between each successive transmitted pair i. CS1 French-language sources fr Articles needing additional references from May All articles needing additional references Articles needing additional references from October The total amplitude of both beams will be the sum of the amplitudes of the two beams measured along a line perpendicular interferometeo the direction of the beam.

In the accompanying illustration, only one ray emitted from point A on the source is traced. Fourier transformation of the electric field in time provides the electric field per unit frequency interval. The maximum reflectivity is given by:. The second term is proportional to a wrapped Lorentzian distribution so that the transmission function may be written as a series of Lorentzian functions:.

This definition of the Airy finesse is consistent with the Taylor criterion of the resolution of a spectrometer.

If the transmitted beams are out-of-phase, destructive interference occurs and this corresponds to a transmission minimum. The limiting case occurs at. By using this site, you agree to the Terms of Use and Privacy Policy.

A related device is the Gires—Tournois etalon.

## Fabry–Pérot interferometer

Since the incident beam was assumed to have an intensity of one, this will also give the transmission function:. Photoniques in French Resonances occur at frequencies at which light exhibits constructive interference after one round trip.

Due to the angle dependence of the transmission, the peaks can also be shifted by rotating the etalon with respect to the beam.

Constructive interference occurs if the transmitted beams are in phaseand this corresponds perlt a high-transmission peak of interffrometro etalon. The intensity of the beam will be just t times its complex conjugate. In other projects Wikimedia Commons. A focusing lens after the pair of flats would produce an inverted image of the source if the flats were not present; all light emitted from a point on the source is focused to a single point in the system’s image plane.

The incident amplitude at point a is taken to be one, and phasors are used to represent the amplitude of the radiation. The amplitude can be rewritten as.

## Interferômetro de Fabry-Pérot

Please help improve this article by adding citations to reliable sources. The field transmitted after the first propagation and the smaller and smaller fields transmitted after each consecutive propagation through the resonator are. Unsourced material may be challenged and removed. Once the internal resonance enhancement, the generic Airy distribution, is established, all other Airy distributions can be deduced by simple scaling factors. If the two beams are out of phase, only a small portion of the launched light is stored inside the resonator.

Archived from the original pdf on The stored, transmitted, and reflected light is spectrally modified compared to the incident light. The measurable case of the intensity resulting from the interference of both backward-propagating electric fields results in the Airy distribution [6].

Two beams are shown in the diagram at the right, one of which T 0 is transmitted through the etalon, and the other of which T 1 is reflected twice before being transmitted. This approximation is then typically also used to calculate the Airy finesse. In the derivation below, n is the index of refraction inside the etalon, and n 0 is that outside the etalon. From Wikipedia, the free encyclopedia.

### Fabry–Pérot interferometer – Wikipedia

In contrast to the exact solution above, it leads to. Whereas the photon decay time is still a well-defined quantity, the linewidth loses its meaning, because it resembles a spectral bandwidth, whose value now changes within that very bandwidth.

Optical Physics 3rd ed. For an asymmetrical cavity, that is, one with two different mirrors, the general form of the transmission function is.