A5009860408- Pulsars and Gravitational Waves Research
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Geophysics and Sensor Technology
- High-pressure geophysics and materials
- Atomic and Subatomic Physics Research
- Adaptive optics and wavefront sensing
- Optical Network Technologies
- Seismic Waves and Analysis
- Geophysics and Gravity Measurements
- Dark Matter and Cosmic Phenomena
- Semiconductor Lasers and Optical Devices
- Photonic and Optical Devices
- Advanced Fiber Optic Sensors
- Astrophysics and Cosmic Phenomena
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Photonic Communication Systems
- Seismic Imaging and Inversion Techniques
- Advanced Power Generation Technologies
- Superconducting and THz Device Technology
- Cosmology and Gravitation Theories
- earthquake and tectonic studies
- Photonic Crystal and Fiber Optics
- Seismology and Earthquake Studies
- Advanced Optical Network Technologies
Leibniz University Hannover
2020-2024
Max Planck Institute for Gravitational Physics
2020-2024
Max Planck Society
2021
Saipem (Italy)
1991
University of Padua
1991
Photon shot noise, arising from the quantum-mechanical nature of light, currently limits sensitivity all gravitational wave observatories at frequencies above one kilohertz. We report a successful application squeezed vacuum states light GEO\,600 observatory and demonstrate for first time reduction quantum noise up to $6.03 \pm 0.02$ dB in kilometer-scale interferometer. This is equivalent high increasing laser power circulating interferometer by factor four. Achieving this milestone, key...
Abstract The nature of dark matter remains unknown to date, although several candidate particles are being considered in a dynamically changing research landscape 1 . Scalar field is prominent option that explored with precision instruments, such as atomic clocks and optical cavities 2–8 Here we describe direct search for scalar using gravitational-wave detector, which operates beyond the quantum shot-noise limit. We set new upper limits on coupling constants function its mass, by excluding...
Abstract Gravitational waves have revolutionised the field of astronomy by providing scientists with a new way to observe universe and gain better understanding exotic objects like black holes. Several large-scale laser interferometric gravitational wave detectors (GWDs) been constructed worldwide, focus on achieving best sensitivity possible. However, in order for detector operate at its intended sensitivity, optics must be free from imperfections such as thermal lensing effects. In GEO 600...
Longitudinal control signals used to keep gravitational wave detectors at a stable operating point are often affected by modulations from test mass misalignments leading an elevated noise floor ranging 50 500 Hz. Nonstationary of this kind results in modulation sidebands and increases the number glitches observed calibrated strain data. These artifacts ultimately affect data quality decrease efficiency analysis pipelines looking for astrophysical continuous waves as well transient events. In...
Two polarisation mode dispersion measurement methods are experimentally compared. The first is based on theory of the principal state and second autocorrelation function light at output fibre. results agree with each other, within experimental accuracy.
Gravitational waves have revolutionised the field of astronomy by providing scientists with a new way to observe universe and gain better understanding exotic objects like black holes. Several large-scale laser interferometric gravitational wave detectors (GWDs) been constructed worldwide, focus on achieving best sensitivity possible. However, in order for detector operate at its intended sensitivity, optics must be free from imperfections such as thermal lensing effects. In GEO\,600...
Measurements performed on 13 cables, first their drums and later when concatenated both in the field, show that polarisation dispersion over long links can be predicted, a statistical sense, from factory tests, individual cables.
Suspended optics in gravitational wave (GW) observatories are susceptible to alignment perturbations, particularly slow drifts over time, due variations temperature and seismic levels. Such misalignments affect the coupling of incident laser beam into optical cavities, degrade both circulating power optomechanical photon squeezing thus decrease astrophysical sensitivity merging binaries. Traditional techniques involve differential wavefront sensing using multiple quadrant photodiodes but...
Squeezed light is injected into the dark port of gravitational wave interferometers, in order to reduce quantum noise. A fraction interferometer output can reach OPO due sub-optimal isolation squeezing injection path. This backscattered interacts with squeezed generation process, introducing additional measurement We present a theoretical description noise coupling mechanism. propose control scheme achieve de-amplification inside consequent reduction caused by it. The was implemented at GEO...
Squeezed light is injected into the dark port of gravitational wave interferometers, in order to reduce quantum noise. A fraction interferometer output can reach OPO due sub-optimal isolation squeezing injection path. This backscattered interacts with squeezed generation process, introducing additional measurement We present a theoretical description noise coupling mechanism and we prove model experimental results. propose control scheme achieve de-amplification inside consequent reduction...
Abstract The nature of dark matter remains unknown to date and several candidate particles are being considered in a dynamically changing research landscape [1]. Scalar field is prominent option that explored with precision instruments such as atomic clocks optical cavities [2-8]. Here we report on the first direct search for scalar utilising gravitational-wave detector operating beyond quantum shot-noise limit. We set new upper limits coupling constants function its mass by excluding...
Aligning suspended optics in gravitational-wave observatories is crucial for detecting astrophysical phenomena⏤and it also challenging, due to several environmental factors. This research implements neural-network-based sensing and control deployed at the GEO600 detector, utilizing a sensor with convolutional neural network long- short-term memory, plus deep-reinforcement-learning-based agent enhanced alignment. The method demonstrates sensitivity improvement over traditional schemes, thus...
Polarization disperson in single-mode fibers has been a steadily developing subject since the introduction of so-called principal states polarization.1 It shown experimentally2 that problem is fully under control statistical sense: for N cascaded fibers, average differential group delay (DGD), τ, grows as N1/2 and Maxwell distribution with standard deviation σ calculated from rms value data measured on individual fibers.
Polarization mode dispersion (PMD) sets an ultimate limit to bit rate in long-haul transmission systems. So far, the PMD has been measured using two main procedures based on different theoretical approaches. One works frequency domain, other one time domain. The first method is evolution of state polarization, as a function frequency, Poincare sphere and measures differential group delay Δτ between principal states polarization (PSPs).1,2