Measurement of optical losses in a high-finesse 300 m filter cavity for broadband quantum noise reduction in gravitational-wave detectors

Capocasa, E.; Guo, Yuhong; Eisenmann, M.; Zhao, Yuhang; Tomura, Akihiro; Arai, K.; Aso, Y.; Marchio, M.; Pinard, L.; Prat, P.; Somiya, K.; Schnabel, R.; Tacca, M.; Takahashi, Ryutaro; Tatsumi, Daisuke; Leonardi, M.; Barsuglia, M.; Flaminio, R.

doi:10.1103/physrevd.98.022010

Cited by 18 publications

(10 citation statements)

References 26 publications

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“…( 4)) for each parameter model. The filter cavity round trip loss is kept constant at the expected A+ level of 60 ppm, which is close to the value already achieved at TAMA [25].…”

Section: B Detunedsupporting

confidence: 60%

Tuning Advanced LIGO to kilohertz signals from neutron-star collisions

Ganapathy,

McCuller,

Rollins

et al. 2020

Preprint

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Gravitational waves produced at kilohertz frequencies in the aftermath of a neutron star collision can shed light on the behavior of matter at extreme temperatures and densities that are inaccessible to laboratory experiments. Gravitational-wave interferometers are limited by quantum noise at these frequencies but can be tuned via their optical configuration to maximize the probability of post-merger signal detection. We compare two such tuning strategies to turn Advanced LIGO into a post-merger-focused instrument: first, a wideband tuning that enhances the instrument's signal-to-noise ratio 40-80% broadly above 1 kHz relative to the baseline, with a modest sensitivity penalty at lower frequencies; second, a "detuned" configuration that provides even more enhancement than the wideband tuning, but over only a narrow frequency band and at the expense of substantially worse quantum noise performance elsewhere. With an optimistic accounting for instrument loss and uncertainty in post-merger parameters, the detuned instrument has a 40% sensitivity improvement compared to the wideband instrument.

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“…( 4)) for each parameter model. The filter cavity round trip loss is kept constant at the expected A+ level of 60 ppm, which is close to the value already achieved at TAMA [25].…”

Section: B Detunedsupporting

confidence: 60%

Tuning Advanced LIGO to kilohertz signals from neutron-star collisions

Ganapathy,

McCuller,

Rollins

et al. 2020

Preprint

View full text Add to dashboard Cite

show abstract

“…(4)] for each parameter model. The filter cavity roundtrip loss is kept constant at the expected Aþ level of 60 ppm, which is close to the value already achieved at TAMA [26].…”

Section: B Detunedsupporting

confidence: 59%

Tuning Advanced LIGO to kilohertz signals from neutron-star collisions

et al. 2021

View full text Add to dashboard Cite

Gravitational waves produced at kilohertz frequencies in the aftermath of a neutron star collision can shed light on the behavior of matter at extreme temperatures and densities that are inaccessible to laboratory experiments. Gravitational-wave interferometers are limited by quantum noise at these frequencies but can be tuned via their optical configuration to maximize the probability of postmerger signal detection. We compare two such tuning strategies to turn Advanced LIGO into a postmerger-focused instrument: first, a wideband tuning that enhances the instrument's signal-to-noise ratio 40-80% broadly above 1 kHz relative to the baseline, with a modest sensitivity penalty at lower frequencies; second, a "detuned" configuration that provides even more enhancement than the wideband tuning, but over only a narrow frequency band and at the expense of substantially worse quantum noise performance elsewhere. With an optimistic accounting for instrument loss and uncertainty in postmerger parameters, the detuned instrument has a ≲40% sensitivity improvement compared to the wideband instrument.

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“…The two are connected by an in-vacuum injection system, including suspended mirrors, which couples the squeezing into the filter cavity. A detailed description of the cavity and the injection apparatus can be found in [24]. The squeezed vacuum beam is produced by the OPO and injected into the filter cavity through the in-vacuum injection telescope.…”

Section: Methodsmentioning

confidence: 99%

“…Since cavity losses are a major threat to squeezing [31], requirements on the mirror surface quality were first determined by numerical simulations, using realistic mirror maps [32]. After the cavity assembly, round-trip losses were measured in the range of 50-90 ppm, compliant with requirements [24]. The filter cavity parameters are reported in Tab.…”

Section: Filter Cavitymentioning

confidence: 99%

Frequency-Dependent Squeezed Vacuum Source for Broadband Quantum Noise Reduction in Advanced Gravitational-Wave Detectors

et al. 2020

Self Cite

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The astrophysical reach of current and future ground-based gravitational-wave detectors is mostly limited by quantum noise, induced by vacuum fluctuations entering the detector output port. The replacement of this ordinary vacuum field with a squeezed vacuum field has proven to be an effective strategy to mitigate such quantum noise and it is currently used in advanced detectors. However, current squeezing cannot improve the noise across the whole spectrum because of the Heisenberg uncertainty principle: when shot noise at high frequencies is reduced, radiation pressure at low frequencies is increased. A broadband quantum noise reduction is possible by using a more complex squeezing source, obtained by reflecting the squeezed vacuum off a Fabry-Perot cavity, known as filter cavity. Here we report the first demonstration of a frequency-dependent squeezed vacuum source able to reduce quantum noise of advanced gravitational-wave detectors in their whole observation bandwidth. The experiment uses a suspended 300 m long filter cavity, similar to the one planned for KAGRA, Advanced Virgo and Advanced LIGO, and capable of inducing a rotation of the squeezing ellipse below 100 Hz.

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Measurement of optical losses in a high-finesse 300 m filter cavity for broadband quantum noise reduction in gravitational-wave detectors

Cited by 18 publications

References 26 publications

Tuning Advanced LIGO to kilohertz signals from neutron-star collisions

Tuning Advanced LIGO to kilohertz signals from neutron-star collisions

Tuning Advanced LIGO to kilohertz signals from neutron-star collisions

Frequency-Dependent Squeezed Vacuum Source for Broadband Quantum Noise Reduction in Advanced Gravitational-Wave Detectors

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