Stuttgart 2012 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 34: Poster 1

Q 34.1: Poster

Tuesday, March 13, 2012, 16:30–19:00, Poster.I+II

Design of an LQG controller to stabilise an optical resonator — •Dirk Schütte, Maximilian Wimmer, Timo Denker, Michèle Heurs, and Karsten Danzmann — Max-Planck-Institut für Gravitationsphysik, Hannover, Deutschland

For many quantum optical systems a high controllability is required. A basic example (the "work horse") is locking an optical resonator to a laser or vice versa. We show that systematic modern control techniques (here linear-quadratic Gaussian control including Kalman filtering) can be applied to achieve frequency locking of a cavity to a laser. The more complex the quantum system becomes the more potential pay-off is gained by a systematic controller implementation. For this reason a successful design of an LQG feedback controller can lead the way to extremely stable systems consisting of multiple / nested feedback loops with multiple actuators and sensors (MIMO systems). We present the design process of an LQG controller with additional integral action, as well as the results of its application to locking a ring cavity to a laser.