Reducing control noise in gravitational wave detectors with interferometric local damping of suspended optics

Dongen, Jesse van; Prokhorov, L.; Cooper, S. J.; Barton, M. A.; Bonilla, E.; Dooley, K. L.; Driggers, J. C.; Effler, A.; Holland, N. A.; Huddart, A. D.; Kasprzack, M.; Kissel, J. S.; Lantz, B.; Mitchell, A. L.; O’Dell, J.; Robertson, C. W.; Mow–Lowry, C. M.

doi:10.1063/5.0144865

Cited by 4 publications

(3 citation statements)

References 38 publications

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“…In the well-known use cases of suspension systems and seismic isolation platforms [22,24], HoQIs will need to operate in conditions of arm length mismatch up to ∆L ≃ 1 mm, due to fluctuations in the working point of the measured objects.…”

Section: Methodology and Requirementsmentioning

confidence: 99%

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Laser frequency stabilization with the use of homodyne quadrature interferometers

Di Fronzo,

Holland,

Mitchell

et al. 2024

Class. Quantum Grav.

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Laser frequency stabilization is a crucial technique for precision metrology.Amongst the techniques currently in use for this purpose, we propose the use of compact interferometric sensors, which are already under investigation for integration into gravitational-wave observatories. We demonstrate laser frequency control using a compact, interferometric sensor, specially modified for sensitivity to laser frequency noise. This setup achieves a balance between compact size, ease of use, and affordability. We stabilize the laser frequency noise, of a low-cost solid-state laser, to 4.5 kHz/√Hz at 1 Hz. The requirement for additional technology, and expense, is negated when identical, compact, interferometric sensors are deployed. This enables wider applications of compact, interferometric sensors by mitigating a fundamental noise source, inherent to their design.

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Section: Methodology and Requirementsmentioning

confidence: 99%

“…Reducing the technical noises is an ongoing effort, focused on more sensitive devices that can allow better sensing and control. One promising avenue is the development of compact interferometric sensors for use in both the seismic isolation and suspension systems [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Laser frequency stabilization with the use of homodyne quadrature interferometers

Di Fronzo,

Holland,

Mitchell

et al. 2024

Class. Quantum Grav.

Self Cite

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“…These algorithms ideally operate in real-time and provide optimal precision. This is especially relevant for the readout of compact interferometric sensors and interferometers that probe local test mass motions in current and future ground-based gravitational wave detectors like LIGO, Virgo, KAGRA and the Einstein Telescope [4][5][6][7][8] , for the readout of inertial sensors and in space-based inertial sensing applications [9][10][11][12] . E.g.…”

Section: Introductionmentioning

confidence: 99%

An analytic, efficient and optimal readout algorithmfor compact interferometers based on deep frequencymodulation

Eckhardt,

Gerberding

2023

Preprint

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Compact laser interferometers with large dynamic range are one of the core emerging tools to improve low frequencyperformance in gravitational wave detectors by providing local displacement sensing with sub pm Hz−0.5 precision. Strongsinusoidal frequency modulations are used in such laser interferometers to create heterodyne-like photodetector signals fromwhich the phase and other parameters, such as the absolute distance, can be extracted. The nested sinusoidal function insuch signals is a challenge for the real-time parameter estimation in low-noise applications. In this article, we present analgorithm to calculate exact signal parameters in a non-iterative way from such interferometric signals. The algorithm makesuse of a recurrence relation between Bessel functions to enable a direct extraction of modulation parameters from the signal.Additionally, the algorithm is capable of dealing with high phase dynamics where the Doppler-shift of the signal becomesrelevant and can limit the range and precision of the parameter estimation if not accounted for. Simulations show that thealgorithm is computationally efficient, can be well parallelised and the phase estimation is close to optimal precision given bythe Cramer-Rao lower bound of the signal parameters.

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Sensors and actuators for the advanced LIGO A+ upgrade

Cooper

Mow–Lowry

Hoyland

et al. 2023

Review of Scientific Instruments

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Advanced Laser Interferometer Gravitational-wave Observatory (LIGO A+) is a major upgrade to LIGO—the Laser Interferometer Gravitational-wave Observatory. For the A+ project, we have developed, produced, and characterized sensors and electronics to interrogate new optical suspensions designed to isolate optics from vibrations. The central element is a displacement sensor with an integrated electromagnetic actuator known as a BOSEM (Birmingham Optical Sensor and ElectroMagnetic actuator) and its readout and drive electronics required to integrate them into LIGO’s control and data system. In this paper, we report on the improvements to the sensors and the testing procedures undertaken to meet the enhanced performance requirements set out by the A+ upgrade to the detectors. The best devices reach a noise level of 4.5 [Formula: see text] at a measurement frequency of 1 Hz, an improvement of 6.7 times over standard devices.

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Reducing control noise in gravitational wave detectors with interferometric local damping of suspended optics

Cited by 4 publications

References 38 publications

Laser frequency stabilization with the use of homodyne quadrature interferometers

Laser frequency stabilization with the use of homodyne quadrature interferometers

An analytic, efficient and optimal readout algorithmfor compact interferometers based on deep frequencymodulation

Sensors and actuators for the advanced LIGO A+ upgrade

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