Actively stabilized wavelength-insensitive carrier elimination from an electro-optically modulated laser beam

TL;DR

This paper presents a robust, polarization-based, non-interferometric method for long-term carrier suppression in phase-modulated laser beams, using active stabilization with feedback to achieve over 28 dB suppression.

Contribution

It introduces a novel polarization-dependent, non-interferometric technique with active feedback for stable carrier elimination in laser systems.

Findings

Achieved over 28 dB carrier suppression.

System maintains long-term stability.

Sideband power reduced by 6.5 dB.

Abstract

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.