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  Michelson interferometer with diffractively-coupled arm resonators in second-order Littrow configuration

Britzger, M., Wimmer, M., Khalaidovski, A., Friedrich, D., Kroker, S., Brueckner, F., et al. (2012). Michelson interferometer with diffractively-coupled arm resonators in second-order Littrow configuration. Optics Express, 20(23), 25400-25408. doi:http://dx.doi.org/10.1364/OE.20.025400.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000E-B16E-9 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-000E-B170-1
Genre: Journal Article

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 Creators:
Britzger, Michael1, Author              
Wimmer, Maximilian1, Author              
Khalaidovski, Alexander1, Author              
Friedrich, Daniel1, Author              
Kroker, Stefanie, Author
Brueckner, Frank, Author
Kley, Ernst-Bernhard, Author
Tuennermann, Andreas , Author
Danzmann, Karsten1, Author              
Schnabel, Roman1, 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: Michelson-type laser-interferometric gravitational-wave (GW) observatories employ very high light powers as well as transmissively- coupled Fabry-Perot arm resonators in order to realize high measurement sensitivities. Due to the absorption in the transmissive optics, high powers lead to thermal lensing and hence to thermal distortions of the laser beam profile, which sets a limit on the maximal light power employable in GW observatories. Here, we propose and realize a Michelson-type laser interferometer with arm resonators whose coupling components are all-reflective second-order Littrow gratings. In principle such gratings allow high finesse values of the resonators but avoid bulk transmission of the laser light and thus the corresponding thermal beam distortion. The gratings used have three diffraction orders, which leads to the creation of a second signal port. We theoretically analyze the signal response of the proposed topology and show that it is equivalent to a conventional Michelson-type interferometer. In our proof-of-principle experiment we generated phase-modulation signals inside the arm resonators and detected them simultaneously at the two signal ports. The sum signal was shown to be equivalent to a single-output-port Michelson interferometer with transmissively-coupled arm cavities, taking into account optical loss. The proposed and demonstrated topology is a possible approach for future all-reflective GW observatory designs.

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 Dates: 2012-09-102012
 Publication Status: Published in print
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 Identifiers: arXiv: 1209.1961
DOI: http://dx.doi.org/10.1364/OE.20.025400
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Title: Optics Express
Source Genre: Journal
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Publ. Info: Washington, DC : Optical Society of America
Pages: - Volume / Issue: 20 (23) Sequence Number: - Start / End Page: 25400 - 25408 Identifier: ISSN: 1094-4087
CoNE: /journals/resource/954925609918