A New Method of Electron Density Measurement by Fabry-Perot Interferometry

Abstract

A new method for determining the electron density of a thin plasma by means of Fabry-Perot interferometry is proposed. The interferometer consists of two plasma layers and dielectric material surrounded by two plasma layers. The transmittance of electromagnetic waves across the interferometer is calculated, and Fabry-Perot resonances are demonstrated. It is shown that the plasma density can be determined based on the measurement of the resonance frequency when the width of a plasma layer is known.