Magneto-optic spectrometer and filter based upon tandem vapor cell dispersion in atomic cesium

Abstract

A magneto-optic spectrometer based upon dispersion associated with the 852 nm absorption line in atomic cesium vapor is demonstrated with high frequency resolution appropriate for measuring motion (Doppler shift). The spectrometer measures frequency without depletion of signal from atomic absorption, and has an 11% total signal extinction from the optic elements of which it is constructed. Also demonstrated is an optical filter with a high transmission region that coincides with the operating range of the spectrometer useful for blocking background light. Possible applications may include ground based LIDAR for long range targets such as space debris and free space optical communication.