Experimental demonstration of coupled optical springs

Gordon, N.A. et al. (2017) Experimental demonstration of coupled optical springs. Classical and Quantum Gravity, 34(3), 035020. (doi: 10.1088/1361-6382/aa556f)

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Optical rigidity will play an important role in improving the sensitivity of future generations of gravitational wave (GW) interferometers, which employ high laser power in order to reach and exceed the standard quantum limit. Several experiments have demonstrated the combined effect of two optical springs on a single system for very low-weight mirror masses or membranes. In this paper we investigate the complex interactions between multiple optical springs and the surrounding apparatus in a system of comparable dynamics to a large-scale GW detector. Using three 100 g mirrors to form a coupled cavity system capable of sustaining two or more optical springs, we demonstrate a number of different regimes of opto-mechanical rigidity and measurement techniques. Our measurements reveal couplings between each optical spring and the control loops that can affect both the achievable increase in sensitivity and the stability of the system. Hence this work establishes a better understanding of the realisation of these techniques and paves the way to their application in future GW observatories, such as upgrades to Advanced LIGO.

Item Type:Articles
Keywords:Gravitational waves.
Glasgow Author(s) Enlighten ID:Bell, Dr Angus and Hild, Professor Stefan and Barr, Dr Bryan and Sorazu Lucio, Dr Borja and Leavey, Mr Sean and Wright, Ms Jennifer and Graef, Dr Christian and Gordon, Mr Neil and Huttner, Dr Sabina and Strain, Professor Kenneth
Authors: Gordon, N.A., Barr, B.W., Bell, A., Graef, C., Hild, S., Huttner, S.H., Leavey, S.S., Macarthur, J., Sorazu, B., Wright, J., and Strain, K.A.
Subjects:Q Science > QC Physics
College/School:College of Science and Engineering > School of Physics and Astronomy
Research Group:Institute for Gravitational Research
Journal Name:Classical and Quantum Gravity
Publisher:IOP Publishing
ISSN (Online):1361-6382
Published Online:12 January 2017
Copyright Holders:Copyright © 2017 IOP Publishing Ltd
First Published:First published in Classical and Quantum Gravity 34(3): 035020
Publisher Policy:Reproduced in accordance with the publisher copyright policy

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
624341Investigations in Gravitational Radiation / Particle Astrophysics Capital equipmentSheila RowanScience & Technologies Facilities Council (STFC)ST/L000946/1S&E P&A - PHYSICS & ASTRONOMY
459312Investigations in Gravitational Radiation.Sheila RowanScience & Technologies Facilities Council (STFC)ST/I001085/1P&A - PHYSICS & ASTRONOMY