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.Comment: 9 pages, 5 figure