dc.identifier.uri |
http://dx.doi.org/10.15488/17013 |
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dc.identifier.uri |
https://www.repo.uni-hannover.de/handle/123456789/17141 |
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dc.contributor.author |
Bergamin, Fabio
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dc.contributor.author |
Lough, James
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dc.contributor.author |
Schreiber, Emil
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dc.contributor.author |
Grote, Hartmut
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dc.contributor.author |
Mehmet, Moritz
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dc.contributor.author |
Vahlbruch, Henning
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dc.contributor.author |
Affeldt, Christoph
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dc.contributor.author |
Andric, Tomislav
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dc.contributor.author |
Bisht, Aparna
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dc.contributor.author |
Brinkmann, Marc
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dc.contributor.author |
Kringel, Volker
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dc.contributor.author |
Lück, Harald
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dc.contributor.author |
Mukund, Nikhil
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dc.contributor.author |
Nadji, Severin
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dc.contributor.author |
Sorazu, Borja
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dc.contributor.author |
Strain, Kenneth
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dc.contributor.author |
Weinert, Michael
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dc.contributor.author |
Danzmann, Karsten
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dc.date.accessioned |
2024-04-10T08:51:04Z |
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dc.date.available |
2024-04-10T08:51:04Z |
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dc.date.issued |
2023 |
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dc.identifier.citation |
Bergamin, F.; Lough, J.; Schreiber, E.; Grote, H.; Mehmet, M. et al.: Characterization and evasion of backscattered light in the squeezed-light enhanced gravitational wave interferometer GEO 600. In: Optics Express (OpEx) 31 (2023), Nr. 23, 38443. DOI: https://doi.org/10.1364/oe.497555 |
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dc.description.abstract |
Squeezed light is injected into the dark port of gravitational wave interferometers, in order to reduce the quantum noise. A fraction of the interferometer output light can reach the OPO due to sub-optimal isolation of the squeezing injection path. This backscattered light interacts with squeezed light generation process, introducing additional measurement noise. We present a theoretical description of the noise coupling mechanism and we prove the model with experimental results. We propose a control scheme to achieve a de-amplification of the backscattered light inside the OPO with a consequent reduction of the noise caused by it. The scheme was implemented at the GEO 600 detector and has proven to be crucial in maintaining a good level of quantum noise reduction of the interferometer for high parametric gain of the OPO. In particular, the mitigation of the backscattered light noise helped in reaching 6 dB of quantum noise reduction [Phys. Rev. Lett. 126, 041102 (2021)]. We show that the impact of backscattered-light-induced noise on the squeezing performance is phenomenologically equivalent to increased phase noise of the squeezing angle control. The results discussed in this paper provide a way for a more accurate estimation of the residual phase noise of the squeezed light field. Finally, the knowledge of the backscattered light noise coupling mechanism is a useful tool to inform the design of the squeezing injection path in terms of path stability and optical isolation. |
eng |
dc.language.iso |
eng |
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dc.publisher |
Washington, DC : Optica |
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dc.relation.ispartofseries |
Optics Express (OpEx) 31 (2023), Nr. 23 |
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dc.rights |
CC BY 4.0 Unported |
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dc.rights.uri |
https://creativecommons.org/licenses/by/4.0 |
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dc.subject |
Backscattering |
eng |
dc.subject |
Gravitational effects |
eng |
dc.subject |
Gravity waves |
eng |
dc.subject |
Noise abatement |
eng |
dc.subject |
Orbits |
eng |
dc.subject.ddc |
530 | Physik
|
|
dc.title |
Characterization and evasion of backscattered light in the squeezed-light enhanced gravitational wave interferometer GEO 600 |
eng |
dc.type |
Article |
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dc.type |
Text |
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dc.relation.essn |
1094-4087 |
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dc.relation.doi |
https://doi.org/10.1364/oe.497555 |
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dc.bibliographicCitation.issue |
23 |
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dc.bibliographicCitation.volume |
31 |
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dc.bibliographicCitation.firstPage |
38443 |
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dc.description.version |
publishedVersion |
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tib.accessRights |
frei zug�nglich |
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