Spectral separator for extracting right pass band of incident beam, used in Doppler Lidar applications

摘要

The separator includes, respectively, in the direction of propagation of the entry light beam: a polarizer (8) inclined on the same direction, a quarter wave-length sheet (12), a standard filter (13) with a cavity tuned to allow the passage of a right space band and reflecting the fraction of the spectrum of the beam outside the band. The standard filter is a Fabry-Perot filter with multiple reflecting capability, placed under the normal incidence. The polarizer is a Brewster sheet. There is a unit to determine the Doppler shift of the ray located in the spatial band.