Characterization and evasion of backscattered light in the squeezed-light 
enhanced gravitational wave interferometer GEO 600

Bergamin, Fabio; Lough, James; Schreiber, Emil; Grote, Hartmut; Mehmet, Moritz; Vahlbruch, Henning; Affeldt, Christoph; Andric, Tomislav; Bisht, Aparna; Brinkmann, Marc; Kringel, Volker; Lück, Harald; Mukund, Nikhil; Nadji, Severin Landry; Sorazu, Borja; Strain, Kenneth; Weinert, Michael; Danzmann, Karsten

doi:10.1364/OE.497555

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Characterization and evasion of backscattered light in the squeezed-light enhanced gravitational wave interferometer GEO 600

MPG-Autoren

/persons/resource/persons231077

Bergamin, Fabio
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

/persons/resource/persons206591

Lough, James
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

/persons/resource/persons40491

Schreiber, Emil
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

/persons/resource/persons40477

Mehmet, Moritz
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

/persons/resource/persons40504

Vahlbruch, Henning
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

/persons/resource/persons40422

Affeldt, Christoph
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

/persons/resource/persons293169

Andric, Tomislav
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

/persons/resource/persons226605

Bisht, Aparna
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

/persons/resource/persons40432

Brinkmann, Marc
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

/persons/resource/persons40468

Kringel, Volker
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

/persons/resource/persons40475

Lück, Harald
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

/persons/resource/persons231145

Mukund, Nikhil
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

/persons/resource/persons231127

Nadji, Severin Landry
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

/persons/resource/persons40509

Weinert, Michael
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

/persons/resource/persons40437

Danzmann, Karsten
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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Zitation

Bergamin, F., Lough, J., Schreiber, E., Grote, H., Mehmet, M., Vahlbruch, H., et al. (2023). Characterization and evasion of backscattered light in the squeezed-light enhanced gravitational wave interferometer GEO 600. Optics Express, 31(23), 38443-38456. doi:10.1364/OE.497555.

Zitierlink: https://hdl.handle.net/21.11116/0000-000E-3C12-B

Zusammenfassung

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. 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 6dB of quantum noise reduction [Phys. Rev. Lett.
126, 041102 (2021)]. 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.