Explain the construction and working of fabry-perot interferometer? Skip to main content

Explain the construction and working of fabry-perot interferometer?

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Question: Explain the construction and working of fabry-perot interferometer?

A Fabry-Perot interferometer is a device that is used to study the optical properties of thin films, as well as measure wavelengths of light. The device consists of two parallel and partially reflective mirrors, with a gap between them, known as the Fabry-Perot cavity.


When light enters the Fabry-Perot cavity, some of it is reflected off the first mirror and some of it passes through the gap between the mirrors. The light that passes through is then reflected off the second mirror, and some of it is transmitted out of the interferometer, while the rest of it is reflected back into the cavity. This process of reflection and transmission continues, creating a series of constructive and destructive interference patterns that are observed as light and dark fringes.


The distance between the mirrors determines the spacing between the fringes, and the reflectivity of the mirrors affects the intensity of the fringes. By adjusting the spacing between the mirrors, the Fabry-Perot interferometer can be used to measure the wavelengths of light, as well as the thickness and refractive index of thin films.


Overall, the Fabry-Perot interferometer is a powerful tool in the field of optics and is used in a variety of applications such as laser cavities, spectroscopy, and telecommunications.


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