@prefix dcat: <http://www.w3.org/ns/dcat#> .
@prefix dct: <http://purl.org/dc/terms/> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix vcard: <http://www.w3.org/2006/vcard/ns#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

<https://rec.harvest-normandie.data4citizen.com/dataset/oai-hal-tel-00842915v1> a dcat:Dataset ;
    dct:description """
              We present the operation of an experimental setup designed to optically measure the quantum position fluctuations of a macroscopic mechanical resonator. The resonator is kept in a cryogenic environment and its movement is monitored with a high-finesse Fabry-Perot cavity. We have designed and realized an optimized resonator for the observation of its quantum position fluctuations. It consists in a quartz micropillar vibrating on a compression mode and clamped at its center by a thin membrane. We have demonstrated a fundamental vibration mode oscillating at 4 MHz with a mechanical quality factor close to two millions. We have implemented this resonator in a high-finesse Fabry-Perot cavity. A high-reflectivity mirror is coated only on top of the pillar in order to avoid any altering of its mechanical quality factor. We have developed a laser photoablation technique in order to realize the coupling mirror of the cavity with a very small radius of curvature as well as a high reflectivity. This allows us to build a cavity with a finesse of 50 000 and an optical beam waist, smaller than 10 μm, fitting the transverse size of the resonator. We had make a dilution refrigerator especially designed and optimized for ultrasensitive position measurement, in which we have operated the optomechanical device. The whole optical setup, made of an ultra-stable laser source and a resonator motion detection device, allows us to observe thermal position fluctuations of the resonator down to about 1 K.
            """ ;
    dct:identifier "tel-00842915" ;
    dct:issued "2026-05-10T10:06:21.751832"^^xsd:dateTime ;
    dct:language "fr" ;
    dct:modified "2026-05-10T10:06:21.751837"^^xsd:dateTime ;
    dct:publisher <https://rec.harvest-normandie.data4citizen.com/organization/cce9db95-46d9-4dc2-84b6-764215d0a002> ;
    dct:title "Cavity optomechanics with a micropillar in cryogenic environment for the observation of the quantum regime of a macroscopic mechanical oscillator." ;
    dcat:contactPoint [ a vcard:Organization ;
            vcard:fn "CCSD" ] ;
    dcat:distribution <https://rec.harvest-normandie.data4citizen.com/dataset/oai-hal-tel-00842915v1/resource/e8b1ddbf-16ff-453b-bf66-59e0af5e005b> ;
    dcat:keyword "bruit-thermique",
        "cavite-a-petit-waist",
        "cavite-de-grande-finesse",
        "cryogenic-optics",
        "cryogenie-a-dilution",
        "dilution-refrigeration",
        "etat-quantique-fondamental",
        "facteur-de-qualite-mecanique",
        "high-finesse-optical-cavity",
        "infoeu-reposemanticsdoctoralthesis",
        "mechanical-oscillator",
        "mechanical-quality-factor",
        "micro-miroir",
        "micro-mirror",
        "optique-en-cryogenie",
        "oscillateur-mecanique",
        "physqphyphysics-physicsquantum-physics-quant-ph",
        "pression-de-radiation",
        "quantum-ground-state",
        "radiation-pressure",
        "radiation-pressure-cooling",
        "refroidissement-par-pression-de-radiation",
        "small-waist-cavity",
        "thermal-noise",
        "thermalisation",
        "thermalization",
        "theses" ;
    dcat:landingPage <https://theses.hal.science/tel-00842915> .

<https://rec.harvest-normandie.data4citizen.com/dataset/oai-hal-tel-00842915v1/resource/e8b1ddbf-16ff-453b-bf66-59e0af5e005b> a dcat:Distribution ;
    dct:format "HTML" ;
    dct:issued "2026-05-10T10:06:21.761724"^^xsd:dateTime ;
    dct:modified "2026-05-10T10:06:21.729125"^^xsd:dateTime ;
    dct:title "Cavity optomechanics with a micropillar in cryogenic environment for the observation of the quantum regime of a macroscopic mechanical oscillator." ;
    dcat:accessURL <https://theses.hal.science/tel-00842915> .

<https://rec.harvest-normandie.data4citizen.com/organization/cce9db95-46d9-4dc2-84b6-764215d0a002> a foaf:Agent ;
    foaf:name "test_moissonnage_selune" .

<https://theses.hal.science/tel-00842915> a foaf:Document .