G. Cagnoli
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View article: Mechanical characterization of silicon for the ETpathfinder test masses
Mechanical characterization of silicon for the ETpathfinder test masses Open
The next generation of gravitational-wave detectors, such as the Einstein Telescope, is designed to reduce noise in a wide band of frequencies compared to the current generation, through the use of new technologies. ETpathfinder, designed …
View article: Development of ion-beam sputtered silicon nitride thin films for low-noise mirror coatings of gravitational-wave detectors
Development of ion-beam sputtered silicon nitride thin films for low-noise mirror coatings of gravitational-wave detectors Open
Brownian thermal noise of thin-film coatings is a fundamental limit for high-precision experiments based on optical resonators such as gravitational-wave interferometers. Here we present the results of a research activity aiming to develop…
View article: Reduction of mechanical losses in ion-beam sputtered tantalum oxide thin films via partial crystallization
Reduction of mechanical losses in ion-beam sputtered tantalum oxide thin films via partial crystallization Open
This study explores the impact of crystalline fraction on the mechanical losses of amorphous tantalum oxide (tantala, Ta 2 O 5 ) thin films intended for gravitational wave detectors. We use ion beam sputtering technique to prepare a series…
View article: Enabling cryogenic gravitational wave detectors: growth of sapphire crystals with record low absorption in the near infrared
Enabling cryogenic gravitational wave detectors: growth of sapphire crystals with record low absorption in the near infrared Open
Sapphire was grown by Czochralski and ultra-low absorption (11 ppm cm −1 ) was achieved. The Fe 2+ –Fe 3+ and Ti 3+ –Ti 3+ pairs are crucial for the absorption at 1064 nm. The result is promised to grow large sapphire for the next generati…
View article: TiO2 doping effect on reflective coating mechanical loss for gravitational wave detection at low temperature
TiO2 doping effect on reflective coating mechanical loss for gravitational wave detection at low temperature Open
We measured the mechanical loss of a dielectric multilayer reflective coating (ion-beam-sputtered SiO2 and Ta2O5) with and without TiO2 on sapphire disks between 6 and 77 K. The measured loss angle exhibited a temperature dependence, and t…
View article: Optical characterization of high performance mirrors based on cavity ringdown time measurements with 6 degrees of freedom mirror positioning
Optical characterization of high performance mirrors based on cavity ringdown time measurements with 6 degrees of freedom mirror positioning Open
An instrument capable of measuring optical losses, transmission, and the radius of curvature of high reflectivity mirrors is presented. The measurement setup consists of two remote controlled hexapod systems with 6 degrees of freedom place…
View article: Virgo detector characterization and data quality: tools
Virgo detector characterization and data quality: tools Open
Detector characterization and data quality studies—collectively referred to as DetChar activities in this article—are paramount to the scientific exploitation of the joint dataset collected by the LIGO-Virgo-KAGRA global network of ground-…
View article: Virgo detector characterization and data quality: results from the O3 run
Virgo detector characterization and data quality: results from the O3 run Open
The Advanced Virgo detector has contributed with its data to the rapid growth of the number of detected GW signals in the past few years, alongside the two Advanced LIGO instruments. First during the last month of the Observation Run 2 (O2…
View article: Frequency-Dependent Squeezed Vacuum Source for the Advanced Virgo Gravitational-Wave Detector
Frequency-Dependent Squeezed Vacuum Source for the Advanced Virgo Gravitational-Wave Detector Open
In this Letter, we present the design and performance of the frequency-dependent squeezed vacuum source that will be used for the broadband quantum noise reduction of the Advanced Virgo Plus gravitational-wave detector in the upcoming obse…
View article: Determination of stress in thin films using micro-machined buckled membranes
Determination of stress in thin films using micro-machined buckled membranes Open
In this work, optical profilometry and finite-element simulations are applied on buckled micromachined membranes for the stress analysis of ion-beam-sputtered Ta2O5 and SiO2 thin films. Layers with different thicknesses are grown on silico…
View article: The Advanced Virgo+ status
The Advanced Virgo+ status Open
The gravitational wave detector Advanced Virgo+ is currently in the commissioning phase in view of the fourth Observing Run (O4). The major upgrades with respect to the Advanced Virgo configuration are the implementation of an additional r…
View article: Advanced Virgo Plus: Future Perspectives
Advanced Virgo Plus: Future Perspectives Open
While completing the commissioning phase to prepare the Virgo interferometer for the next joint Observation Run (O4), the Virgo collaboration is also finalizing the design of the next upgrades to the detector to be employed in the followin…
View article: The Virgo O3 run and the impact of the environment
The Virgo O3 run and the impact of the environment Open
Sources of geophysical noise (such as wind, sea waves and earthquakes) or of anthropogenic noise impact ground-based gravitational-wave interferometric detectors, causing transient sensitivity worsening and gaps in data taking. During the …
View article: Characterization of Ion-Beam-Sputtered <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll"><mml:msub><mml:mrow><mml:mi>Al</mml:mi><mml:mi mathvariant="normal">F</mml:mi></mml:mrow><mml:mn>3</mml:mn></mml:msub></mml:math> Thin Films for Gravitational-Wave Interferometers
Characterization of Ion-Beam-Sputtered Thin Films for Gravitational-Wave Interferometers Open
Thermal noise in amorphous coatings is a limitation for a wide range of precision experiments such
\nas gravitational-wave detectors (GWDs). Mirrors for GWDs are composed of multiple thin layers
\nof dielectric materials deposited on a sub…
View article: Stability of samples in coating research: From edge effect to ageing
Stability of samples in coating research: From edge effect to ageing Open
View article: A Systematic Error in the Internal Friction Measurement of Coatings for Gravitational Waves Detectors
A Systematic Error in the Internal Friction Measurement of Coatings for Gravitational Waves Detectors Open
Low internal friction coatings are key components of advanced technologies such as optical atomic clocks and high-finesse optical cavity and often lie at the forefront of the most advanced experiments in Physics. Notably, increasing the se…
View article: Effects of mixing and annealing on the optical and mechanical properties of TiO$_{2}$:Ta$_{2}$O$_{5}$ amorphous coatings
Effects of mixing and annealing on the optical and mechanical properties of TiO$_{2}$:Ta$_{2}$O$_{5}$ amorphous coatings Open
Amorphous mixed titania-tantala coatings are key components of Bragg reflectors in the gravitational wave detectors (GWDs). Attaining the lowest possible values of optical absorption and mechanical losses in the coatings is of paramount im…
View article: Argon and Other Defects in Amorphous SiO2 Coatings for Gravitational-Wave Detectors
Argon and Other Defects in Amorphous SiO2 Coatings for Gravitational-Wave Detectors Open
Amorphous SiO2 thin films are one of the two components of the highly reflective mirror coatings of gravitational-wave detectors. For this study, layers of amorphous SiO2 on crystalline Si substrates were produced by ion-beam sputtering (I…
View article: Calibration of advanced Virgo and reconstruction of the detector strain h( t) during the observing run O3
Calibration of advanced Virgo and reconstruction of the detector strain h( t) during the observing run O3 Open
The three advanced Virgo and LIGO gravitational wave detectors participated to the third observing run (O3) between 1 April 2019 15:00 UTC and 27 March 2020 17:00 UTC, leading to several gravitational wave detections per month. This paper …
View article: Calibration of advanced Virgo and reconstruction of the detector strain <i>h</i>(<i>t</i>) during the observing run O3
Calibration of advanced Virgo and reconstruction of the detector strain <i>h</i>(<i>t</i>) during the observing run O3 Open
The three advanced Virgo and LIGO gravitational wave detectors participated to the third observing run (O3) between 1 April 2019 15:00 UTC and 27 March 2020 17:00 UTC, leading to several gravitational wave detections per month. This paper …
View article: Optical and mechanical properties of ion-beam-sputtered MgF$_2$ thin films for gravitational-wave interferometers
Optical and mechanical properties of ion-beam-sputtered MgF$_2$ thin films for gravitational-wave interferometers Open
Brownian thermal noise associated with highly reflective coatings is a fundamental limit for several precision experiments, including gravitational-wave detectors. Research is currently ongoing to find coatings with low thermal noise that …
View article: Effects of the annealing of amorphous Ta2O5 coatings produced by ion beam sputtering concerning the effusion of argon and the chemical composition
Effects of the annealing of amorphous Ta2O5 coatings produced by ion beam sputtering concerning the effusion of argon and the chemical composition Open
View article: Quantum Backaction on Kg-Scale Mirrors: Observation of Radiation Pressure Noise in the Advanced Virgo Detector
Quantum Backaction on Kg-Scale Mirrors: Observation of Radiation Pressure Noise in the Advanced Virgo Detector Open
The quantum radiation pressure and the quantum shot noise in laser-interferometric gravitational wave detectors constitute a macroscopic manifestation of the Heisenberg inequality. If quantum shot noise can be easily observed, the observat…
View article: Advanced Virgo Status
Advanced Virgo Status Open
The detection of a gravitational wave signal in September 2015 by LIGO interferometers, announced jointly by LIGO collaboration and Virgo collaboration in February 2016, opened a new era in Astrophysics and brought to the whole community a…
View article: Increasing the Astrophysical Reach of the Advanced Virgo Detector via the Application of Squeezed Vacuum States of Light
Increasing the Astrophysical Reach of the Advanced Virgo Detector via the Application of Squeezed Vacuum States of Light Open
Current interferometric gravitational-wave detectors are limited by quantum noise over a wide range of their measurement bandwidth. One method to overcome the quantum limit is the injection of squeezed vacuum states of light into the inter…
View article: Point defects in IBS coating for very low loss mirrors
Point defects in IBS coating for very low loss mirrors Open
High reflective coatings are used in many physics experiments. Despite the high quality of the opticalcoating, the performances of the mirrors is altered by the scattered light induced by micrometers sizedefects in the coating layers. The …
View article: The advanced Virgo longitudinal control system for the O2 observing run
The advanced Virgo longitudinal control system for the O2 observing run Open
View article: A Standard Siren Measurement of the Hubble Constant from GW170817 without the Electromagnetic Counterpart
A Standard Siren Measurement of the Hubble Constant from GW170817 without the Electromagnetic Counterpart Open
We perform a statistical standard siren analysis of GW170817. Our analysis does not utilize knowledge of NGC 4993 as the unique host galaxy of the optical counterpart to GW170817. Instead, we consider each galaxy within the GW170817 locali…
View article: Progress in the measurement and reduction of thermal noise in optical coatings for gravitational-wave detectors
Progress in the measurement and reduction of thermal noise in optical coatings for gravitational-wave detectors Open
Coating thermal noise is a fundamental limit for experiments involving optical and quantum transducers. We report on the latest research activity on low-noise coatings at the Laboratoire des Matériaux Avancés, from updated values for the c…
View article: Calibration of advanced Virgo and reconstruction of the gravitational wave signal <i>h</i> ( <i>t</i> ) during the observing run O2
Calibration of advanced Virgo and reconstruction of the gravitational wave signal <i>h</i> ( <i>t</i> ) during the observing run O2 Open
In August 2017, advanced Virgo joined advanced LIGO for the end of the O2 run, leading to the first gravitational waves detections with the three-detector network. This paper describes the advanced Virgo calibration and the gravitational w…