A coherent CO2 lidar system has been modified to record various states of polarization of the backscattered radiation. Methods for measuring the degree of polarization in the backscattered radiation as well as the optical thickness of clouds are described and demonstrated successfully.
Abraham Gross, Madison J. Post, and Freeman F. Hall, Jr., "Depolarization, backscatter, and attenuation of CO2 lidar by cirrus clouds," Appl. Opt. 23, 2518-2522 (1984)