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  Laser interferometry with translucent and absorbing mechanical oscillators

Friedrich, D., Kaufer, H., Westphal, T., Yamamoto, K., Sawadsky, A., Khalili, F. Y., et al. (2011). Laser interferometry with translucent and absorbing mechanical oscillators. New Journal of Physics, 13: 093017. doi:10.1088/1367-2630/13/9/093017.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-03EB-A Version Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-03EC-8
Genre: Journal Article

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1104.3251 (Preprint), 706KB
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 Creators:
Friedrich, D.1, Author              
Kaufer, H.1, Author              
Westphal, T.1, Author              
Yamamoto, K.1, Author              
Sawadsky, A., Author
Khalili, F. Ya., Author
Danilishin, S., Author
Goßler, S.1, Author              
Danzmann, K.1, Author              
Schnabel, R.1, Author              
Affiliations:
1Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_24010              

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Free keywords: Physics, Optics, physics.optics
 Abstract: The sensitivity of laser interferometers can be pushed into regimes that enable the direct observation of quantum behaviour of mechanical oscillators. In the past, membranes with subwavelength thickness (thin films) have been proposed as high-mechanical-quality, low-thermal-noise oscillators. Thin films from a homogenous material, however, generally show considerable light transmission accompanied by heating due to light absorption, which typically reduces the mechanical quality and limits quantum opto-mechanical experiments in particular at low temperatures. In this work, we experimentally analyze a Michelson-Sagnac interferometer including a translucent silicon nitride (SiN) membrane with subwavelength thickness. We find that such an interferometer provides an operational point being optimally suited for quantum opto-mechanical experiments with translucent oscillators. In case of a balanced beam splitter of the interferometer, the membrane can be placed at a node of the electro-magnetic field, which simultaneously provides lowest absorption and optimum laser noise rejection at the signal port. We compare the optical and mechanical model of our interferometer with experimental data and confirm that the SiN membrane can be coupled to a laser power of the order of one Watt at 1064 nm without significantly degrading the membrane's quality factor of the order 10^6, at room temperature.

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 Dates: 2011-04-162011
 Publication Status: Published in print
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 Identifiers: arXiv: 1104.3251
DOI: 10.1088/1367-2630/13/9/093017
URI: http://arxiv.org/abs/1104.3251
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Title: New Journal of Physics
  Other : New J. Phys.
Source Genre: Journal
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Publ. Info: Bristol, UK : Institute of Physics Pub.
Pages: - Volume / Issue: 13 Sequence Number: 093017 Start / End Page: - Identifier: ISSN: 1367-2630
CoNE: /journals/resource/954926913666