Frequency Locking of an Optical Cavity using LQG Integral Control

Details Frequency Locking of an Optical Cavity using LQG Integral Control Frequency Locking of an Optical Cavity using LQG Integral Control

2008-09-03

arxiv.org/abs/0809.0545v1

Journal of Physics B: Atomic, Molecular and Optical Physics, vol. 42, 175501, 2009

Physics

Quantum Physics

18 pages, 9 figures

Scientific paper

This paper considers the application of integral Linear Quadratic Gaussian (LQG) optimal control theory to a problem of cavity locking in quantum optics. The cavity locking problem involves controlling the error between the laser frequency and the resonant frequency of the cavity. A model for the cavity system, which comprises a piezo-electric actuator and an optical cavity is experimentally determined using a subspace identification method. An LQG controller which includes integral action is synthesized to stabilize the frequency of the cavity to the laser frequency and to reject low frequency noise. The controller is successfully implemented in the laboratory using a dSpace DSP board.

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