Actively stabilized wavelength-insensitive carrier elimination from an   electro-optically modulated laser beam
  We demonstrate a simple and robust technique for removal of the carrier wave from a phase-modulated laser beam, using a non-interferometric method that is insensitive to the modulation frequency and instead exploits the polarization-dependence of electro-optic modulation. An actively stabilized system using feedback via a liquid crystal cell yields long-term carrier suppression in excess of 28 dB at the expense of a 6.5 dB reduction in sideband power. 
Nathan Cooper, James Bateman, Alexander Dunning and Tim Freegarde
physics.atom-ph physics.optics