Fabry Perot resonator - Fabry Perot mode analyzer
$1.00
A Fabry Perot resonator is formed by two mirrors aligned parallel to each other. The resulting cavity changes transparency when the distance of the mirrors is changed by a multiple of half the wavelength. Scanning the length of the cavity creates a high resolution spectrometer.
Experiment shows an open frame scanning Fabry Perot. As scanner a Piezo element and as probe a two mode Helium Neon laser is used. The mode spectrum of the Helium Neon laser is displayed on an oscilloscope and the characteristic parameter like finesse, free spectral range, resolution and contrast are measured and discussed. Additional components for beam expansion are used to investigate the effect of technical Finesse. Additional mirrors are used to show the difference of a plane and confocal Fabry Perot arrangement.
