Patent ID: 8125641

Claim:
A method for phase-compensated spectroscopy comprising: a) deriving a beam of radiation in a polarization state PS p from a source emitting at a plurality of wavelengths; b) placing in said beam a compensator capable of altering said polarization state PS p by applying a delimited phase shift Δ between two orthogonal polarization axes to restrict a finely-vibrating spectrum; c) disposing a sample in said beam after said compensator to generate a response beam; d) passing a polarization state PS a of said response beam to a detector to measure a spectrum of said response beam; e) collecting a first spectrum when said polarization states PS p , PS a and said compensator are in a first polarization-altering configuration; f) collecting a second spectrum when said polarization states PS p , PS a and said compensator are in a second polarization-altering configuration; and g) deriving a phase-compensated spectrum from said first spectrum and said second spectrum.