Details
| Original language | English |
|---|---|
| Article number | 082003 |
| Journal | Physical Review D |
| Volume | 105 |
| Issue number | 8 |
| Publication status | Published - 26 Apr 2022 |
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%.
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In: Physical Review D, Vol. 105, No. 8, 082003, 26.04.2022.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Improving the stability of frequency-dependent squeezing with bichromatic control of filter cavity length, alignment, and incident beam pointing
AU - Zhao, Yuhang
AU - Capocasa, Eleonora
AU - Eisenmann, Marc
AU - Aritomi, Naoki
AU - Page, Michael
AU - Guo, Yuefan
AU - Polini, Eleonora
AU - Arai, Koji
AU - Aso, Yoichi
AU - van Beuzekom, Martin
AU - Huang, Yao-Chin
AU - Lee, Ray-Kuang
AU - Lueck, Harald
AU - Miyakawa, Osamu
AU - Prat, Pierre
AU - Shoda, Ayaka
AU - Tacca, Matteo
AU - Takahashi, Ryutaro
AU - Vahlbruch, Henning
AU - Vardaro, Marco
AU - Wu, Chien-Ming
AU - Leonardi, Matteo
AU - Barsuglia, Matteo
AU - Flaminio, Raffaele
PY - 2022/4/26
Y1 - 2022/4/26
N2 - 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%.
AB - 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%.
UR - http://www.scopus.com/inward/record.url?scp=85129359979&partnerID=8YFLogxK
U2 - 10.1103/PhysRevD.105.082003
DO - 10.1103/PhysRevD.105.082003
M3 - Article
VL - 105
JO - Physical Review D
JF - Physical Review D
SN - 2470-0010
IS - 8
M1 - 082003
ER -