A new topology for the control of complex interferometers

Abstract

We discuss a new control topology which will generate control signals for the output optics of complex interferometers operating on a pure dark fringe. Our system, which involves the injection of a modulated control field through the output port of the interferometer, is also compatible with the use of squeezed light. We discuss this topology in the context of the control of an interferometer featuring a variable reflectivity signal recycling mirror and present results from a coupled cavity geometry to demonstrate some of the features.