High-sensitivity three-mode optomechanical transducer

Three-mode optomechanical interactions have been predicted to allow the creation of very high sensitivity transducers in which very strong optical self-cooling and strong optomechanical quantum entanglement are predicted. Strong coupling is achieved by engineering a transducer in which both the pump...

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Bibliographic Details
Published in:Physical review. A, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2011-12, Vol.84 (6), Article 063836
Main Authors: Zhao, C., Fang, Q., Susmithan, S., Miao, H., Ju, L., Fan, Y., Blair, D., Hosken, D. J., Munch, J., Veitch, P. J., Slagmolen, B. J. J.
Format: Article
Language:English
Subjects:
CARBON DIOXIDE LASERS
COOLING
FABRY-PEROT INTERFEROMETER
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
MIRRORS
NOISE
OPTIMIZATION
QUANTUM ENTANGLEMENT
SAPPHIRE
SENSITIVITY
SIGNAL-TO-NOISE RATIO
TRANSDUCERS
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Summary:Three-mode optomechanical interactions have been predicted to allow the creation of very high sensitivity transducers in which very strong optical self-cooling and strong optomechanical quantum entanglement are predicted. Strong coupling is achieved by engineering a transducer in which both the pump laser and a single signal sideband frequency are resonantly enhanced. Here we demonstrate that very high sensitivity can be achieved in a very simple system consisting of a Fabry-Perot cavity with CO{sub 2} laser thermal tuning. We demonstrate a displacement sensitivity of {approx}1x10{sup -17} m/{radical}(Hz), which is sufficient to observe a thermally excited acoustic mode in a 5.6 kg sapphire mirror with a signal-to-noise ratio of more than 20 dB. It is shown that a measurement sensitivity of {approx}2x10{sup -20} m/{radical}(Hz) limited by the quantum shot noise is achievable with optimization of the cavity parameters.
ISSN:1050-2947
1094-1622
DOI:10.1103/PhysRevA.84.063836