A5066349533- Pulsars and Gravitational Waves Research
- Geophysics and Sensor Technology
- Mechanical and Optical Resonators
- Geophysics and Gravity Measurements
- Gamma-ray bursts and supernovae
- High-pressure geophysics and materials
- Advanced Frequency and Time Standards
- Adaptive optics and wavefront sensing
- Semiconductor materials and devices
- Astrophysical Phenomena and Observations
- Cosmology and Gravitation Theories
- Advanced Fiber Laser Technologies
- Cold Atom Physics and Bose-Einstein Condensates
- Semiconductor materials and interfaces
- Advanced MEMS and NEMS Technologies
- Advanced Measurement and Metrology Techniques
- Radio Astronomy Observations and Technology
- Seismic Waves and Analysis
- Silicon Nanostructures and Photoluminescence
- Statistical and numerical algorithms
- Solid State Laser Technologies
- Astronomy and Astrophysical Research
- Acoustic Wave Resonator Technologies
- Photonic and Optical Devices
- Advanced Fiber Optic Sensors
Institute of Nuclear Physics of Lyon
1997-2025
Laboratoire des Matériaux Avancés
2016-2025
Centre National de la Recherche Scientifique
2016-2025
Université Claude Bernard Lyon 1
2014-2025
Institut de Physique des 2 Infinis de Lyon
2020-2025
University of Liège
2024
University of Toyama
2023-2024
Institut National de Physique Nucléaire et de Physique des Particules
2010-2023
Matériaux Ingénierie et Science
2023
The University of Tokyo
2023
Reducing thermal noise from optical coatings is crucial to reaching the required sensitivity in next generation interferometric gravitational-wave detectors. Here we show that adding TiO2 Ta2O5 Ta2O5/SiO2 reduces internal friction and addition present data confirming it noise. We also TiO2-doped are close satisfying absorption requirements of second
For the first time, direct detection of gravitational waves occurred in Laser Interferometer Gravitational-wave Observatory (LIGO) interferometers. These advanced detectors require large fused silica mirrors with optical and mechanical properties have never been reached until now. This paper details main achievements these ion beam sputtering coatings.
We present the results of mechanical characterizations many different high-quality optical coatings made ion-beam-sputtered titania-doped tantala and silica, developed originally for interferometric gravitational-wave detectors. Our data show that in multilayer stacks (like high-reflection Bragg mirrors, example) measured coating dissipation is systematically higher than expectation correlated with stress condition sample. This has a particular relevance noise budget current advanced...
Mirror coatings play a crucial role in the performance of laser interferometers devoted to gravitational wave detection such as Virgo and LIGO. Mechanical losses coating material limit sensitivity detectors due associated mirror thermal noise. The absorption light induces lens substrate which reduces quality optical interference requires sophisticated compensation systems. This paper describes work ongoing at LMA order reduce mechanical coating. results obtained by doping Ta2O5 layers...
We report on magneto-optical studies of Bi2Se3, a representative member the 3D topological insulator family. Its electronic states in bulk are shown to be well described by simple Dirac-type Hamiltonian for massive particles with only two parameters: fundamental band gap and velocity. In magnetic field, this model implies unique property-spin splitting equal twice cyclotron energy: Es=2Ec. This explains extensive magnetotransport concluding fortuitous degeneracy spin orbital split Landau...
This paper describes the making of large mirrors for laser interferometer gravitational wave detectors. These optics, working in near infrared, are among best optics ever created and played a crucial role first direct detection waves from black holes or neutron star fusions.
Abstract Blistering is a phenomenon sometimes observed in sputtered-deposited thin films but seldom investigated detail. Here, we consider the case of titania-doped germania (TGO)/silica multilayers deposited by ion beam sputtering. TGO candidate as high refractive index material Bragg mirrors for next iteration gravitational waves detectors. It needs to be annealed at 600 ∘ C 100 h order reach desired relaxation state. However under some growth conditions, 52-layer TGO/silica stacks,...
Here we report the first results comparing temperature dependence of mechanical dissipation in thin films Ta_2O_5 and doped with TiO_2, a type suitable for use multilayer optical coatings advanced gravitational wave detectors. The indicate that doping TiO_2 can significantly alter distribution activation energies associated low-temperature peak.
Abstract High-reflection interference mirrors for current gravitational wave detectors (aLIGO, Advanced Virgo, KAGRA) are made of high-quality oxide multi-layers deposited by ion beam sputtering (IBS) at the Laboratoire des Matériaux Avancés (LMA). For this task, LMA uses a large IBS custom-made machine (the grand coater GC) able to deposit very uniform coatings over surfaces, with diameter some tens cm. We report first time about optical characterization spectroscopic ellipsometry GC under...
Abstract We report on the results of an extensive campaign optical and mechanical characterization ion-beam sputtered oxide layers (Ta 2 O 5 , TiO Ta –TiO SiO ) within high-reflection coatings Advanced LIGO, Virgo KAGRA gravitational-wave detectors: refractive index, thickness, absorption, composition, density, internal friction elastic constants have been measured; impact deposition rate post-deposition annealing coating has assessed. For layers, increases with rate, whereas treatment...
Thermal noise arising from mechanical dissipation in oxide coatings is a major limitation to many precision measurement systems, including optical frequency standards, high-resolution spectroscopy and interferometric gravity wave detectors. Presented here are measurements of as function temperature between 7 K 290 ion-beam-sputtered Ta2O5 doped with TiO2, showing loss peak at 20 K. Analysis the provides first evidence source coatings, leading possibilities for reduction thermal effects.
We report on the measurement of optical absorption bulk crystalline silicon at 1550 nm. Using photodeflection technique, as low 5 ppm/cm has been measured a sample with resistivity 10 kΩ·cm . The function derived for n-type silicon.
As part of the R&D toward production high flux polarised Gamma-rays we have designed and built a non-planar four-mirror optical cavity with finesse operated it at particle accelerator. We report on main challenges such cavity, as design suitable laser based fiber technology, mechanical difficulties having tunability stability in an accelerator environment active stabilization by implementing double feedback loop FPGA.
In recent years, an increasing number of devices and experiments are shown to be limited by mechanical thermal noise. particular, subhertz laser frequency stabilization gravitational wave detectors that able measure fluctuations ${10}^{\ensuremath{-}18}\text{ }\text{ }\mathrm{m}/\sqrt{\mathrm{Hz}}$ or less being noise in the dielectric coatings deposited on mirrors. this paper, we present a new measurement low absorption microcantilevers, compare it with results obtained from loss...
We report on low-frequency measurements of the mechanical loss a high-quality (transmissivity T<5 ppm at λ(0)=1064 nm, absorption <0.5 ppm) multilayer dielectric coating ion-beam-sputtered fused silica and titanium-doped tantala in 10-300 K temperature range. A useful parameter for computation thermal noise different substrates is derived as function frequency.
Energy dissipation in amorphous coatings severely affects high-precision optical and quantum transducers. In order to isolate the source of coating loss, we performed an extensive study Raman scattering mechanical loss a thermally treated sputtered silica coating. Our results show that is correlated with population three-membered rings Si-${\mathrm{O}}_{4}$ tetrahedral units support evidence thermal treatment reduces density metastable states separated by characteristic energy about 0.5 eV...
Brownian thermal noise associated with highly reflective mirror coatings is a fundamental limit for several precision experiments, including gravitational-wave detectors. Recently, there has been worldwide effort to find improved properties that also fulfill strict optical requirements such as low absorption and scatter. We report on the mechanical of ion-beam-sputtered niobia titania-niobia thin films, we discuss application in current future an updated direct coating measurement HR used...
Abstract We report on the development and extensive characterization of co-sputtered tantala–zirconia (Ta 2 O 5 -ZrO ) thin films, with goal to decrease coating Brownian noise in present future gravitational-wave detectors. tested a variety sputtering processes different energies deposition rates, we considered effect values cation ratio η = Zr/(Zr + Ta) post-deposition heat treatment temperature T optical mechanical properties films. Co-sputtered zirconia proved be an efficient way...
Amorphous SiO2 thin films are one of the two components highly reflective mirror coatings gravitational-wave detectors. For this study, layers amorphous on crystalline Si substrates were produced by ion-beam sputtering (IBS), using accelerated neutralized argon ions as particles, is case for actual The aim study to investigate possible presence various defects in materials order improve coating quality. We provide evidence that, due synthesis method, about 0.2 wt.% Ar present coatings, and...
Amorphous mixed titania-tantala coatings are key components of Bragg reflectors in gravitational-wave detectors (GWDs). Attaining the lowest possible values optical absorption and mechanical losses is paramount importance for GWDs, this requires a complex optimization coating deposition postdeposition annealing. We present here systematic investigation properties internal friction amorphous grown by ion beam sputtering. consider with six different cation mixing ratios─defined as Ti/(Ti +...