FabryPérotkammare

Fabry-Pérotkammare, also known as a Fabry-Pérot cavity or interferometer, is an optical resonator consisting of two parallel mirrors, usually partially reflective, facing each other. Light entering the cavity is reflected back and forth between the mirrors. Constructive interference occurs when the cavity's length is an integer multiple of half the wavelength of the light, allowing light of specific wavelengths to be transmitted or amplified. This property makes it useful for selecting or enhancing particular frequencies of light.

The Fabry-Pérotkammare is a fundamental component in various optical instruments. In spectroscopy, it serves as a high-resolution tunable filter, allowing for the isolation and analysis of narrow spectral lines. It is also employed in laser cavities, where the mirrors form the resonant structure that sustains laser oscillation. The precise control over the cavity length allows for tuning the laser's output wavelength. Furthermore, Fabry-Pérot interferometers find applications in fields such as metrology for highly accurate distance measurements and in telecommunications for wavelength division multiplexing. The performance of a Fabry-Pérotkammare is characterized by its finesse, which relates to the sharpness of the transmitted spectral peaks and is influenced by the reflectivity of the mirrors and the quality of the optical surfaces.