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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This page was last edited on 2 Novemberat The measurable case of the intensity resulting from the interference of both backward-propagating electric fields results in the Airy distribution [6]. Photoniques in French By using this site, you agree to the Terms of Use and Privacy Policy.

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

This section does not cite any sources. To within a constant afbry phase factor, the amplitude of the m th transmitted beam can be written as:. The second term is proportional to a wrapped Lorentzian distribution so that the transmission function may be written as a series of Lorentzian functions:.

For an asymmetrical cavity, that is, one with two different mirrors, the general form of the transmission function is.

Interferometro de Fabry-Perot

As the ray passes through the paired flats, it is multiply reflected to produce multiple transmitted rays which are collected by the focusing lens and brought to point A’ on the screen. Precisely, the former is an etalon and the latter is an interferometerbut the terminology is often used inconsistently. Please help improve this section by adding citations to reliable sources. Please help improve this article by adding citations to reliable sources.

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Once the internal resonance enhancement, interfrrometro generic Airy interferometrro, is established, all other Airy distributions can be deduced by simple scaling factors. In contrast to the exact solution above, it leads to. Svelto, “Principles of Lasers”, 5th ed. It is named after Charles Fabry and Alfred Perotwho developed the instrument in The series is a geometric series whose sum can be expressed analytically.

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 field transmitted after the first propagation and the smaller and smaller fields transmitted after each consecutive propagation through the resonator are. The generic Airy distribution, which considers solely the physical processes exhibited by light inside the resonator, then derives as the intensity circulating in the resonator relative to the intensity launched, [6].

Diode Lasers and Photonic Integrated Circuits 2nd interferimetro. Archived from the original pdf on The Taylor criterion of spectral resolution proposes that two spectral lines can be resolved if the individual lines cross at half intensity.

Unsourced material may be challenged and removed. Etalons are widely used in telecommunicationslasers and spectroscopy to control and measure the wavelengths of light. If the reflectivity is high, resulting in a high Q factormonochromatic light produces interfermetro set of narrow bright rings against a dark background. The complete interference pattern takes the appearance of a set of concentric rings.

In a typical system, illumination is provided by a diffuse source set at the focal plane of a collimating lens.

May Learn how and when to remove this template message. Since the incident beam was assumed to have an intensity of one, this will also give the transmission function:. The sharpness of the rings depends on the reflectivity of the flats.

Constructive interference occurs if the transmitted beams are in phaseand this corresponds to a high-transmission peak of the etalon. Therefore, an often applied Airy distribution is [6]. A intreferometro device is the Interefrometro etalon. Fourier transformation of the electric field in time provides the electric field per unit frequency interval.


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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. Light is launched into the resonator under normal incidence.

Since it is interference that modifies the spectral contents, the spectral intensity distribution inside the resonator would be the same as the incident spectral intensity distribution, and no resonance enhancement would occur inside the resonator.

The flats in an interferometer are often made in a wedge shape to prevent the rear surfaces from producing interference fringes; the rear surfaces often also have an anti-reflective coating.

Fabry–Pérot interferometer – Wikidata

Physically, the Airy distribution is the sum of mode profiles of the longitudinal resonator modes. If both surfaces have a reflectance Rthe transmittance function of the etalon is given by.

The limiting case occurs at. The maximum reflectivity is given by:. If the transmitted beams are out-of-phase, destructive interference occurs and this corresponds to a transmission minimum.

Interferómetro Fabry-Pérot

This definition of the Airy finesse is consistent with the Taylor criterion of the resolution of a spectrometer. The amplitude can be rewritten as. However, this approach is physically interfetometro, because it assumes that interference takes place between the outcoupled beams after mirror 2, outside the resonator, rather than the launched and circulating beams after mirror 1, inside the resonator.

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