ORCID Profile
0000-0003-0606-725X
Current Organisation
Centre National de la Recherche Scientifique
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Publisher: AIP Publishing
Date: 10-2023
DOI: 10.1063/5.0167492
Publisher: American Vacuum Society
Date: 03-02-2023
DOI: 10.1116/5.0128487
Abstract: We present a number of approaches, currently in experimental development in our research groups, toward the general problem of macroscopic quantum mechanics, i.e., manifestations of quantum noise and quantum fluctations with macroscopic (engineered and microfabricated by man) mechanical systems. Discussed experiments include a pendulum, a torsion pendulum, a ng-scale phononic-crystal silicon nitride membrane, a μ g-scale quartz resonator, and mg-scale mirrors for optical levitation. We also discuss relevant applications to quantum thermometry with optomechanical systems and the use of squeezed light to probe displacements beyond conventional quantum limits.
Publisher: The Optical Society
Date: 23-10-2019
Publisher: Optica Publishing Group
Date: 03-12-2020
DOI: 10.1364/AO.410407
Abstract: An observation of prior-damage behavior inside a high-finesse optical resonator is reported. Intra-cavity average power drops appeared with magnitude and time scale depending on the power level. Increasing further the incident laser beam power led to irreversible damage of the cavity coupling mirror surface. The origin of this phenomenon is investigated with post mortem mirror surface imaging and analysis of the signals reflected and transmitted by the enhancement cavity. Scattering losses induced by surface deformation due to a hot-spot surface contaminant is found to be most likely the dominant physics process behind this phenomenon.
Publisher: Optica Publishing Group
Date: 03-05-2021
DOI: 10.1364/AO.415462
Abstract: High-reflective coatings are used in many physics experiments. Despite the high quality of the optical coating, the performances of the mirrors are altered by the scattered light induced by micrometer size defects in the coating layers. The topic of this paper is the study of the point-like scatterers present in the specific coating of the mirrors used in state-of-the-art, high-sensitivity optical experiments. We studied the behavior of the materials according to different thicknesses and the resulting defects after annealing. To the best of our knowledge, this is the first insight into the formation of such defects for different materials and thickness and how this is reduced when s les are annealed.
Publisher: AIP Publishing
Date: 12-2016
DOI: 10.1063/1.4972106
Abstract: A new method of probing mechanical losses and comparing the corresponding deposition processes of metallic and dielectric coatings in 1-100 MHz frequency range and cryogenic temperatures is presented. The method is based on the use of high-quality quartz acoustic cavities whose internal losses are orders of magnitude lower than any available coating nowadays. The approach is demonstrated for chromium, chromium/gold, and multilayer tantala/silica coatings. The Ta2O5/SiO2 coating has been found to exhibit a loss angle lower than 1.6 × 10−5 near 30 MHz at 4 K. The results are compared to the previous measurements.
No related grants have been discovered for Christophe MICHEL.