1. A Raman analyzer for analyzing light emitted from a Raman cell, comprising: a beam splitter configured to split the light emitted from the Raman cell into a first beam and a second beam; an atomic vapor filter configured to remove a Raman scattered line from the first beam; a chopper system configured to periodically interrupt the first and second beam; and a photo detector configured to convert light from the first and second beams into an electrical signal.