What is the principle of Fabry-Perot interferometer?
The Fabry-Perot interferometer uses the phenomenon of multiple beam interference that arises when light shines through a cavity bounded by two reflective parallel surfaces. Each time the light encounters one of the surfaces, a portion of it is transmitted out, and the remaining part is reflected back.
What is a Fabry-Perot interferometer used for?
Fabry-Pérot interferometers have many applications in spectroscopy. However, in engineering nanometrology they are used as the cavity in lasers and they can be used to generate very small, very well defined displacements, either as part of a laser (the so-called ‘measuring laser’) or as an external cavity.
What is Fabry-Perot modes?
Fabry–Perot lasers have their frequency controlled by the spacing of mirrors at each end of the laser. The frequency control mechanism is such that the laser can oscillate simultaneously, or jump in rapid succession, to several wavelengths that are close to each other. This is sometimes called mode hopping.
Why fringes are circular in Fabry-Perot interferometer?
The phase relationship between the transmitted rays depends on the angle at which each ray enters the cavity and on the distance between the two mirrors. The result is a circular fringe pattern, similar to the Michelson pattern, but with fringes that are thinner, brighter, and more widely spaced.
How does Fabry-Perot cavity work?
A Fabry-Perot cavity consists of two mirrors facing each other. The mirrors form an optical resonator in which a light field, e.g. a laser beam, can be resonantly enhanced. The notebooks in this directory explain and investigate some of the most important properties of a Fabry-Perot cavity, using a plane-wave analysis.
Why do we use Fabry-Perot interferometer to study spectra?
… higher spectral resolution astronomers employ Fabry-Pérot interferometers. Spectra provide powerful diagnostics of the physical conditions within nebulae. Images and spectra provided by Earth-orbiting satellites, especially the Hubble Space Telescope, have yielded data of unprecedented quality.
How does a Fabry-Perot Etalon work?
An etalon is an optical interferometer that consists of two glass plates, separated by a small,flxed distance. A beam oflight undergoes multiple reflections between the surfaces of the glass plates. This results in optical transmission (or reflection) that is periodic in wavelength.
Who invented Fabry-Perot interferometer?
The Fabry-Pérot interferometer (variable-gap interferometer) was produced in 1897 by the French physicists Charles Fabry and Alfred Pérot. It consists of two highly reflective and strictly parallel plates called an etalon.
What is difference between Michelson interferometer and Fabry-Perot interferometer?
This Fabry-Perot interferometer or etalon is a folded Michelson interferometer. With a Fabry-Perot etalon we observe the interference pattern formed by light that is transmitted through two partially reflecting mirrors, while with a Michelson interferometer we observe the interference pattern formed by reflected light.
What are the principles of Fabry Perot interferometer?
1 Principles of the Fabry-Perot Interferometer. The Fabry-Perot interferometer is an optical instrument which uses multiple-beam interference. Its transfer function is that of a plane-parallel plate which is described in textbooks for optics [1].
What happens when the Fabry-Perot interferometer is irradiated obliquely with monochromatic light?
If the Fabry-Perot interferometer is irradiated obliquely with monochromatic light, constructive or destructive interference occurs depending on the angle of incidence α. If there are many different angles of incidence α at the same time, several intensity maxima and minima are obtained in the form of concentric circles.
What is the use of interferometer?
An interferometer is a device to make light beams interfere. A light beam is the totality of light rays which enter an optical element (lens, mirror, etc.), the area of which is limited by a diaphragm. The diaphragm may be realized by the edge of the element itself.
What is confocal Fabry-Perot?
Confocal Fabry-Perot •The radii of curvature of mirrors are chosen to be the same as those of the beam wavefronts •For a symmetrical resonator: •Then there is no change in the transverse profile •For the confocal geometry, these reduce to: π λ ω