Frequency locking of an optical cavity using linear - Quadratic Gaussian integral control
Date
2009
Authors
Hassen, S Z Sayed
Heurs, Michelle
Huntington, Elanor Harriet
Petersen, Ian R
James, Matthew
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Institute of Physics Publishing
Abstract
We show that a systematic modern control technique such as linear-quadratic Gaussian (LQG) control can be applied to a problem in experimental quantum optics which has previously been addressed using traditional approaches to controller design. 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 digital signal processing board. One important advantage of the LQG technique is that it can be extended in a straightforward way to control systems with multiple measurements and multiple feedback loops. This work is expected to pave the way for extremely stable lasers with fluctuations approaching the quantum noise limit and which could be potentially used in a wide range of applications.
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Keywords: Controller designs; D-space; Frequency locking; Integral action; Laser frequency; Linear quadratic Gaussian; Low-Frequency Noise; LQG controller; Modern control; Multiple feedback; Multiple measurements; Optical cavities; Quantum noise limit; Quantum opti
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Journal of Physics B: Atomic, Molecular and Optical Physics
Type
Journal article
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2037-12-31
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