Search Results - "Michau, V."

Comparison of centroid computation algorithms in a Shack–Hartmann sensor by Thomas, S., Fusco, T., Tokovinin, A., Nicolle, M., Michau, V., Rousset, G.

“…Analytical theory is combined with extensive numerical simulations to compare different flavours of centroiding algorithms: thresholding, weighted centroid,…”
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Study of optimal wavefront sensing with elongated laser guide stars by Thomas, S. J., Adkins, S., Gavel, D., Fusco, T., Michau, V.

“…Over the past decade, adaptive optics (AO) has become an established method for overcoming the effects of atmospheric turbulence on both astronomical imaging…”
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Misalignment estimation for active telescopes by Escolle, C., Michau, V., Ferrari, M., Fusco, T., Hugot, E.

“…The estimation of the misalignment of an active telescope, from aberrations measured in its focal plane, is a tomographic issue. MMSE-based estimation is…”
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Sky coverage estimation for multiconjugate adaptive optics systems: strategies and results by Fusco, T., Blanc, A., Nicolle, M., Beuzit, J.-L., Michau, V., Rousset, G., Hubin, N.

“…We propose an improvement of the sky coverage estimation for multiconjugate adaptive optics (MCAO) systems. A new algorithm is presented which allows us to…”
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First Experimental Demonstration of Adaptive Optics Pre-Compensation for GEO Feeder Links in a Relevant Environment by Vedrenne, N., Montri, J., Conan, J. M., Michau, V., Sodnik, Z., Voland, C., Montmerle-Bonnefois, A., Lim, C. B., Petit, C., Sauvage, J. F., Meimon, S., Perrault, P., Mendez, F., Fleury, B.

“…The future of very high throughput optical links between the ground and GEO satellites depends on the ability to overcome turbulence channel disruptions caused…”
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Photon return analysis of a polychromatic laser guide star by Froc, G, Rosencher, E, Attal-Trétout, B, Michau, V

“…The numbers of UV photons detected in a two photon sodium guide star are calculated in different laser excitation regimes. These values are somewhat smaller…”
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A 32-Input Integrated Coherent Combiner by Kincaid, P. S., De Marinis, L., Contestabile, G., Michau, V., Lucas, Y., Krafft, L., Karppinen, M., Cherchi, M.

“…Free space optics enables high data rate satellite communications but suffers from turbulence-induced losses. A coherent combiner for a turbulence mitigation…”
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Adaptive optics for the E-ELT: Lessons for ICAN by Petit, C., Michau, V., Lombard, L.

“…The ICAN beam combining system may require a control with thousands of degrees of freedom. The methods developed for the control of adaptive optics are…”
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Adaptive optics results with SOTA by Petit, C., Vedrenne, N., Michau, V., Artaud, G., Issler, J.-L, Samain, E., Toyoshima, M., Akioka, M., Kolev, D., Munemasa, Y., Takenaka, H., Iwakiri, N.

“…Next generation satellite-to-ground laser link systems, either for telemetry or satcom will request very high data rate. This goal could be achieved with a…”
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Collective synchronization and phase locking of fs fiber amplifiers: Requirements and potential solutions by Lombard, L., Bellanger, C., Canat, G., Mugnier, L., Cassaing, F., Michau, V., Bourdon, P., Primot, J.

“…Active coherent beam combination (CBC) of femtosecond pulses requires knowledge of the absolute phase between all the optical pulses: pulse synchronization and…”
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ICAN as a new laser paradigm for high energy, high average power femtosecond pulses by Brocklesby, W.S., Nilsson, J., Schreiber, T., Limpert, J., Brignon, A., Bourderionnet, J., Lombard, L., Michau, V., Hanna, M., Zaouter, Y., Tajima, T., Mourou, Gérard

“…The application of petawatt lasers to scientific and technological problems is advancing rapidly. The usefulness of these applications will depend on being…”
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Study of optimal wavefront sensing with elongated laser guide stars by Thomas, S. J., Adkins, S., Gavel, D., Fusco, T., Michau, V.

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Tunable and high-energy Q-switched operation of an alexandrite slave ring laser by Michau, V., de Rougemont, F., Frey, R.

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Comparison of centroid computation algorithms in a Shack-Hartmann sensor: Comparison of centroid computation algorithms by Thomas, S., Fusco, T., Tokovinin, A., Nicolle, M., Michau, V., Rousset, G.

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Comparison of centroid computation algorithms in a Shack-Hartmann sensor by Thomas, S., Fusco, T., Tokovinin, A., Nicolle, M., Michau, V., Rousset, G.

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Femtosecond filamentation in turbulent air by Houard, A., Franco, M., Prade, B., Durécu, A., Lombard, L., Bourdon, P., Vasseur, O., Fleury, B., Robert, C., Michau, V., Couairon, A., Mysyrowicz, A.

“…The influence of air turbulence on femtosecond laser filamentation is studied experimentally and numerically for laser powers of a few critical powers. Air…”
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Towards multiscale reconstruction of perturbated phase from Hartmann-Shack acquisitions by Maji, S. K., Yahia, H., Pont, O., Sudre, J., Fusco, T., Michau, V.

“…Atmospheric turbulence perturbates to a great extent the optical path of incoming light from outer space thereby limiting the resolution power of capturing…”
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A multiscale approach to phase reconstruction for Adaptive Optics by Maji, S. K., Yahia, H., Pont, O., Fusco, T., Michau, V., Sudre, J.

“…Adaptive Optics (AO) refers to (servo-control) methods used in astronomical imaging to compensate in real time for the loss of spatial resolution power of the…”
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Filamentation in turbulent air by Couairon, A., Houard, A., Franco, M., Prade, B., Mysyrowicz, A., Durecu, A., Lombard, L., Bourdon, P., Vasseur, O., Fleury, B., Robert, C., Michau, V.

“…We present experimental and theoretical results on the robustness, beam pointing accuracy and survival probability of femtosecond filaments in turbulent air…”
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Simulation of the photon return of a mono and polychromatic sodium guide star by Froc, G., Attal-Tretout, B., Rosencher, E., Michau, V., Gustafson, T.K.

“…Summary form only given. Adaptive optics can improve the imaging of ground based telescopes near the diffraction limit in spite of atmospheric turbulence…”
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