Improving the stability of frequency-dependent squeezing with bichromatic control of filter cavity length, alignment, and incident beam pointing

authored by: Yuhang Zhao, Eleonora Capocasa, Marc Eisenmann, Naoki Aritomi, Michael Page, Yuefan Guo, Eleonora Polini, Koji Arai, Yoichi Aso, Martin van Beuzekom, Yao-Chin Huang, Ray-Kuang Lee, Harald Lueck, Osamu Miyakawa, Pierre Prat, Ayaka Shoda, Matteo Tacca, Ryutaro Takahashi, Henning Vahlbruch, Marco Vardaro, Chien-Ming Wu, Matteo Leonardi, Matteo Barsuglia, Raffaele Flaminio
Abstract: Frequency-dependent squeezing is the main upgrade for achieving broadband quantum noise reduction in upcoming observation runs of gravitational wave detectors. The proper frequency dependence of the squeezed quadrature is obtained by reflecting squeezed vacuum from a Fabry-Perot filter cavity detuned by half of its line width. However, since the squeezed vacuum contains no classical amplitude, copropagating auxiliary control beams are required to achieve the filter cavity's length, alignment, and incident beam pointing stability. In our frequency-dependent squeezing experiment at the National Astronomical Observatory of Japan, we used a control beam at a harmonic of squeezed vacuum wavelength and found visible detuning variation related to the suspended mirrors angular drift. These variations can degrade interferometer quantum noise reduction. We investigated various mechanisms that can cause the filter cavity detuning variation. The detuning drift is found to be mitigated sufficiently by fixing the incident beam pointing and applying filter cavity automatic alignment. It was also found that there is an optimal position of the beam on the filter cavity mirror that helps to reduce the detuning fluctuations. Here, we report a stabilized filter cavity detuning variation of less than 10 Hz compared to the 113 Hz cavity line width. Compared to previously published results [Phys. Rev. Lett. 124, 171101 (2020)PRLTAO0031-900710.1103/PhysRevLett.124.171101, such detuning stability would be sufficient to make filter cavity detuning drift induced gravitational wave detector detection range fluctuation reduce from 11% to within 2%.
Organisation(s): Institute of Gravitation Physics
QuantumFrontiers
External Organisation(s): University of Tokyo
Astroparticle and Cosmology Laboratory, Paris
National Astronomical Observatory of Japan (NAOJ)
Universite de Savoie
National Institute for Subatomic Physics (Nikhef)
LIGO Laboratory
National Tsing Hua University
University of Amsterdam
University of Padova
Type: Article
Journal: Physical Review D
Volume: 105
ISSN: 2470-0010
Publication date: 26.04.2022
Publication status: Published
Peer reviewed: Yes
Electronic version(s): https://doi.org/10.1103/PhysRevD.105.082003 (Access: Open)

BibTeX

@article{0b90c990260f415297ecde5275e96926,
title = "Improving the stability of frequency-dependent squeezing with bichromatic control of filter cavity length, alignment, and incident beam pointing",
abstract = "Frequency-dependent squeezing is the main upgrade for achieving broadband quantum noise reduction in upcoming observation runs of gravitational wave detectors. The proper frequency dependence of the squeezed quadrature is obtained by reflecting squeezed vacuum from a Fabry-Perot filter cavity detuned by half of its line width. However, since the squeezed vacuum contains no classical amplitude, copropagating auxiliary control beams are required to achieve the filter cavity's length, alignment, and incident beam pointing stability. In our frequency-dependent squeezing experiment at the National Astronomical Observatory of Japan, we used a control beam at a harmonic of squeezed vacuum wavelength and found visible detuning variation related to the suspended mirrors angular drift. These variations can degrade interferometer quantum noise reduction. We investigated various mechanisms that can cause the filter cavity detuning variation. The detuning drift is found to be mitigated sufficiently by fixing the incident beam pointing and applying filter cavity automatic alignment. It was also found that there is an optimal position of the beam on the filter cavity mirror that helps to reduce the detuning fluctuations. Here, we report a stabilized filter cavity detuning variation of less than 10 Hz compared to the 113 Hz cavity line width. Compared to previously published results [Phys. Rev. Lett. 124, 171101 (2020)PRLTAO0031-900710.1103/PhysRevLett.124.171101, such detuning stability would be sufficient to make filter cavity detuning drift induced gravitational wave detector detection range fluctuation reduce from 11% to within 2%.",
author = "Yuhang Zhao and Eleonora Capocasa and Marc Eisenmann and Naoki Aritomi and Michael Page and Yuefan Guo and Eleonora Polini and Koji Arai and Yoichi Aso and {van Beuzekom}, Martin and Yao-Chin Huang and Ray-Kuang Lee and Harald Lueck and Osamu Miyakawa and Pierre Prat and Ayaka Shoda and Matteo Tacca and Ryutaro Takahashi and Henning Vahlbruch and Marco Vardaro and Chien-Ming Wu and Matteo Leonardi and Matteo Barsuglia and Raffaele Flaminio",
note = "Funding Information: We thank J. Degallaix, X. Ding, and T. Liu for their contributions and discussions. We thank G. Hartmut and A. Jones for their comments on this work. We thank also Advanced Technology Center of National Astronomical Observatory of Japan for the support. We acknowledge the help from members of KAGRA Collaboration, Virgo Collaboration, and LIGO Collaboration. This work was supported by the JSPS Grant-in-Aid for Scientific Research (Grants No. 15H02095, No. 18H01235, and No. 21H04476), the JSPS Core-to-Core Program, and the EU Horizon 2020 Research and Innovation Programme under the Marie Sklodowska-Curie Grant Agreement No. 734303. Y. Z. was supported by the Graduate University for Advanced Studies, SOKENDAI, by the Japanese government Ministry of Education, Culture, Sports, Science and Technology scholarship, and by the Institute for Cosmic Ray Research Young Researcher{\textquoteright}s Fund. M. E. was supported by the JSPS Standard Postdoctoral Fellowship (Grant No. 20F20803). M. P. was supported by the JSPS Standard Postdoctoral Fellowship (Grant No. 20F20713). H. L. and H. V. were supported by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany{\textquoteright}s Excellence Strategy—EXC 2123 QuantumFrontiers—390837967. N. A. was supported by JSPS Grant-in-Aid for Scientific Research (Grant No. 18H01224), JSPS Grant-in-Aid for Challenging Research (Exploratory) (Grant No. 18K18763), and Japan Science and Technology Agency, Core Research for Evolutional Science and Technology (Grant No. JPMJCR1873).",
year = "2022",
month = apr,
day = "26",
doi = "10.1103/PhysRevD.105.082003",
language = "English",
volume = "105",
journal = "Physical Review D",
issn = "2470-0010",
publisher = "American Institute of Physics",
number = "8",
}