S Z Sayed Hassen et al 2009 J. Phys. B: At. Mol. Opt. Phys. 42 175501 doi:10.1088/0953-4075/42/17/175501
S Z Sayed Hassen1, M Heurs1, E H Huntington1, I R Petersen1 and M R James2
Show affiliationsWe 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.
42.50.Ct Quantum description of interaction of light and matter; related experiments
42.50.Lc Quantum fluctuations, quantum noise, and quantum jumps
Issue 17 (14 September 2009)
Received 1 October 2008, in final form 14 July 2009
Published 10 August 2009
S Z Sayed Hassen et al 2009 J. Phys. B: At. Mol. Opt. Phys. 42 175501
A Annibale et al 2009 J. Phys. A: Math. Theor. 42 485001
S V Buldyrev et al 2009 J. Phys.: Condens. Matter 21 504106
C Duval and P A Horváthy 2009 J. Phys. A: Math. Theor. 42 465206
Leif Matsson 2009 J. Phys.: Condens. Matter 21 502101
T H Hoffmann et al 2009 J. Phys. B: At. Mol. Opt. Phys. 42 215202
P W Martin 2000 Metrologia 37 185
T J Quinn 2000 Metrologia 37 353
G K Brennen et al 2009 New J. Phys. 11 103023
Leonid I Zaichik and Vladimir M Alipchenkov 2009 New J. Phys. 11 103018