dorsal/arxiv
View SchemaEtude du couplage optomecanique dans une cavite de grande finesse. Observation du mouvement Brownien d'un miroir
| Authors | Yassine Hadjar |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0402145 |
| URL | https://arxiv.org/abs/quant-ph/0402145 |
| Journal | Thesis, Universite Pierre et Marie Curie - Paris VI (1998) |
Abstract
The topic of this thesis is the theoretical analysis of the optomechanical coupling effects in a high-finesse optical cavity, and the experimental realization of such a device. Radiation pressure exerted by light limits the sensitivity of high precision optical measurements. In particular, the sensitivity of interferometric measurements of gravitational wave is limited by the so called standard quantum limit. cavity with a movable mirror. The internal field stored in such cavity can be orders of magnitude greater than the input field, and it's radiation pressure force can change the physical length of the cavity. In turn, any change in the mirror's position changes the phase of the out put field. This optomechanical coupling leads to an intensity-dependent phase shift for the light equivalent to an optical Kerr effect. Such a device can then be used for squeezing generation or quantum nondemolition measurements. In our experiment, we send a laser beam in to a high-finesse optical cavity with a movable mirror coated on a high Q-factor mechanical resonator. Quantum effects of radiation pressure become therefore, at low temperature, experimentally observable. However, we've shown that the phase of the reflected field is very sensitive to small mirror displacements, which indicate other possible applications of this type of device like high precision displacements measurements. We've been able to observe the Brownian motion of the moving mirror. We've also used an auxiliary intensity modulated laser beam to optically excite the acoustic modes. We've finally obtained a sensitivity of 2x10^(-19) m/sqrt(Hz), in agreement with theoretical prediction.
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"abstract": "The topic of this thesis is the theoretical analysis of the optomechanical\ncoupling effects in a high-finesse optical cavity, and the experimental\nrealization of such a device. Radiation pressure exerted by light limits the\nsensitivity of high precision optical measurements. In particular, the\nsensitivity of interferometric measurements of gravitational wave is limited by\nthe so called standard quantum limit. cavity with a movable mirror. The\ninternal field stored in such cavity can be orders of magnitude greater than\nthe input field, and it\u0027s radiation pressure force can change the physical\nlength of the cavity. In turn, any change in the mirror\u0027s position changes the\nphase of the out put field. This optomechanical coupling leads to an\nintensity-dependent phase shift for the light equivalent to an optical Kerr\neffect. Such a device can then be used for squeezing generation or quantum\nnondemolition measurements. In our experiment, we send a laser beam in to a\nhigh-finesse optical cavity with a movable mirror coated on a high Q-factor\nmechanical resonator. Quantum effects of radiation pressure become therefore,\nat low temperature, experimentally observable. However, we\u0027ve shown that the\nphase of the reflected field is very sensitive to small mirror displacements,\nwhich indicate other possible applications of this type of device like high\nprecision displacements measurements. We\u0027ve been able to observe the Brownian\nmotion of the moving mirror. We\u0027ve also used an auxiliary intensity modulated\nlaser beam to optically excite the acoustic modes. We\u0027ve finally obtained a\nsensitivity of 2x10^(-19) m/sqrt(Hz), in agreement with theoretical prediction.",
"arxiv_id": "quant-ph/0402145",
"authors": [
"Yassine Hadjar"
],
"categories": [
"quant-ph"
],
"journal_ref": "Thesis, Universite Pierre et Marie Curie - Paris VI (1998)",
"title": "Etude du couplage optomecanique dans une cavite de grande finesse. Observation du mouvement Brownien d\u0027un miroir",
"url": "https://arxiv.org/abs/quant-ph/0402145"
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