A5103207567- Pulsars and Gravitational Waves Research
- Adaptive optics and wavefront sensing
- High-pressure geophysics and materials
- Gamma-ray bursts and supernovae
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Geophysics and Sensor Technology
- Geophysics and Gravity Measurements
- Optical Systems and Laser Technology
- Advanced Measurement and Metrology Techniques
- Astrophysical Phenomena and Observations
- Advanced optical system design
- Cosmology and Gravitation Theories
- Optical Coatings and Gratings
- Surface Roughness and Optical Measurements
- Radio Astronomy Observations and Technology
- Metal and Thin Film Mechanics
- Calibration and Measurement Techniques
- Seismic Waves and Analysis
- Advanced Frequency and Time Standards
- Optical measurement and interference techniques
- Advanced Fiber Laser Technologies
- Photonic and Optical Devices
- Dark Matter and Cosmic Phenomena
- Advanced Sensor Technologies Research
Institute of Nuclear Physics of Lyon
2020-2025
Institut de Physique des 2 Infinis de Lyon
2020-2025
Laboratoire des Matériaux Avancés
2015-2025
Université Claude Bernard Lyon 1
2014-2025
Centre National de la Recherche Scientifique
2012-2024
Institut National de Physique Nucléaire et de Physique des Particules
2012-2018
MORFEO is a post-focal adaptive optics module that forms part of the first light instrument suite for Extreme Large Telescope (ELT). The project now in Final Design Phase. In this paper, we report status project.
We discuss a method to control the coating thickness deposited onto large and strongly curved optics by ion beam sputtering. The technique uses an original design of mask used screen part sputtered materials. A first multielement is calculated from measured two-dimensional distribution. Then, means iterative process, final designed. By using such technique, it has been possible deposit layers tantalum pentoxide having high gradient substrate 500 mm in diameter. Residual errors profile are below 0.7%.
The second generation of gravitational wave detectors will aim at improving by an order magnitude their sensitivity versus the present ones (LIGO and VIRGO). These are based on long-baseline Michelson interferometer with high finesse Fabry-Perot cavity in arms have strong requirements mirrors quality. large low-loss (340 mm diameter, 200 thick) must a near perfect flatness. coating process shall not add surface figure Zernike terms higher than amplitude <0.5 nm over central 160 diameter....
The Visible Tunable Filter (VTF) is a diffraction-limited narrowband tunable instrument for imaging spectropolarimetry in the wavelength range between 520 and 860 nm. It based on large-format Fabry Perot. will be one of first-light instruments 4m aperture Daniel K. Inoue Solar Telescope (DKIST). To provide field view 1 arcmin spectral resolution λ/Δλ about 100.000, required free Perot 250mm. high reflectivity coatings Etalon plates need to meet specifications over entire preserve plate...
Euclid is the second M-class mission of ESA's Cosmic Vision Program. It implements a space telescope to be launched at L2. The objective characterize dynamics early Universe by using two instruments: high definition camera VIS (visible instrument) and spectrophotometer NISP (Near Infrared Spectrometer Photometer). Light entering either reflected toward in visible band, or transmitted infrared band dichroic mirror. In order guarantee quality scientific data delivered mission, knowledge any...
MORFEO (Multi-conjugate adaptive Optics Relay For ELT Observations, formerly MAORY), the MCAO system for ELT, will provide diffraction-limited optical quality to large field camera MICADO. has officially passed Preliminary Design Review and it is entering final design phase. We present current status of project, with a focus on optics aspects expected milestones during next project
The Large Synoptic Survey Telescope (LSST) uses a novel, three-mirror, telescope design feeding camera system that includes set of broad-band filters and three refractive corrector lenses to produce flat field at the focal plane with wide view. Optical is integrated in optical mirrors optimize performance. We discuss rationale for LSST optics design, describe methodology fabricating, coating, mounting testing filters, present results detailed analyses demonstrating will meet their performance goals.
We designed and manufactured an optical bench to characterize the EUCLID dichroic reflected wavefront at all useful incidences, polarization states each wavelength from 550nm 950nm. The multilayer coating adds indeed some phase effect that vary suddenly in function of wavelength. testbed architecture, main functionalities performances are presented. preliminary results obtained on mirror compared simulations based up-to-date model coating.
MICADO is the ELT first light instrument, an imager working at diffraction limit of telescope thanks to two adaptive optics (AO) modes: a single conjugate one (SCAO), available instrument and developed by consortium, multi (MCAO), MORFEO consortium. Although project final design review process about be completed, board ESO acknowledged that "the can considered complete for majority sub-systems" agreed start manufacturing. For SCAO module, we have started manufacturing several parts:...
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 research activity aiming to develop lower-noise ion-beam sputtered silicon nitride thin films compliant with very stringent requirements loss In order test hypothesis correlation between synthesis conditions and their elemental composition mechanical properties, varied voltage, current intensity...
High precision measurements of the filters bandpass used on wide-field imagers mounted large telescopes is critical for type Ia supernovae studies. A dedicated spectrophotometric bench to re-measure now decommissioned ugriz SNLS CFHT-MegaCam. full characterization optical response with respect location surface and angle incidence was performed each filter. Strong variation over filter observed. The impact actual observation evaluated we demonstrate an improvement previous published results (SNLS1 2).
Multilayers coating are needed for large optical components performances, but the thickness non-uniformities over useful aperture can generate spatial and chromatic variations of reflectance, transmittance wavefront errors. Although these dependences be measured, they difficult to anticipate if underlying unknown. We present a model retrieve from error measurements that enables computation any properties at wavelength, angle incidence or polarization.
High reflective coatings are used in many physics experiments. Despite the high quality of opticalcoating, performances mirrors is altered by scattered light induced micrometers sizedefects coating layers. The topic this paper study point-like scatterers present thespecific state art, sensitivity optical We studied thebehavior materials according to different thicknesses, and how defects change after annealing.To our knowledge, a first insight into formation such for andthickness reduced...
MICADO is the ELT first light instrument, an imager working at diffraction limit of telescope thanks to two adaptive optics (AO) modes: a single conjugate one (SCAO), available instrument and developed by consortium, multi (MCAO), MORFEO consortium. This contribution presents overview SCAO module while its are in last phase their final design review. We focus on architecture choices present subsystems: Green Doughnut structure, wavefront sensor, calibration unit, ICS (i.e. AOCS) RTC. also...
To improve the in situ monitoring of thin films at Laboratoire des Matériaux Avancés, a broadband optical coated was developed and installed biggest ion-beam sputtering machine world. Due to configuration coating chamber strain under vacuum, standard calibration procedure is impossible double-beam system not suitable. A novel theoretical practical solution calibrate measurements found described this paper. Some relevant results achieved thanks technique are discussed as well.
The first large Fabry-Perot etalon (Ø35 cm) of the VTF instrument was coated successfully using IBS technique. High Reflective (HR) coatings need to meet reflectivity specifications (95 +/- 1%) over entire wavelength range 520-870 nm and aperture (Ø25 also preserve plate's flatness airgap uniformity between two platesto be better than 3 RMS. change figure error individual faces after HR coating exceptionally small: For plate 1 (upper) it changed from 1.7nm RMS before 2.12 coating, no at all...
Point defects in coating induce detrimental scattering loss. For this purpose, the density and size distribution were analyzed for silica tantala layers by studying influence of thickness annealing parameters.
In order to enhance the final performances of complex optical systems it is required limit overall wasted reflected light coming from all different surfaces involved. Ultra-low-reflectance coating becomes even a crucial point for high sensitivity experiments such as gravitational wave detectors where must have reflectance lower than 100 ppm. Some tenths percent common value Anti-Reflective (AR) but below ppm trickier achieve. The design with respect thickness errors or refractive index error...
Masking technique and planetary motion are two techniques to improve the coating thickness uniformity. However their combination generates a characteristic pattern like spiral that can limit sensitivity of gravitational wave interferometers.
A real-time optical monitoring of coated thin films is being installed in a large coating machine. An system and simulation software were developped, predicting the success rate deposition.
Due to the increase of astronomical projects and their instruments, request large optics with higher optical performances does not stop growing. An important step in manufacture these is deposition high-precision coatings. <br/> To answer this we developed coatings working at different angles incidence spectral ranges on surface: <ul> <li>- anti-reflective for lenses strong curvatures, </li> dichroic sharp transition optics.</li> </ul> Main results will be presented basis several examples...
Due to the increasing number of astronomical projects and their associated instruments, request large optics with higher optical performances does not stop growing. An important step in manufacture these is deposition high-precision coatings. To answer this request, we developed dichroic coatings, sharp transition for optics, working at different angles incidence spectral ranges. The work done HRS LRS instruments 4MOST project will be presented.