Zobrazeno 1 - 10
of 125
pro vyhledávání: '"Calia, D."'
Autor:
Vogt, F. P. A., Mehner, A., Figueira, P., Yu, S., Kerber, F., Pfrommer, T., Hackenberg, W., Calia, D. Bonaccini
Ground-based optical astronomical observations supported by or in the vicinity of laser guide-star systems can be contaminated by Raman-scattered laser photons. Anticipating, alleviating, and correcting for the impact of this self-inflicted contamina
Externí odkaz:
http://arxiv.org/abs/2304.13747
Laser Guide Star Adaptive Optics (LGS-AO) is becoming routine in several astronomical observatories. The use of powerful lasers generates sensible Raman emissions on the uplink laser beam path, plus secondary Rayleigh scattering from atmospheric mole
Externí odkaz:
http://arxiv.org/abs/2208.01332
Autor:
Hellemeier, J., Enderlein, M., Hager, M., Calia, D. Bonaccini, Johnson, R. L., Lison, F., Byrd, M. O., Kann, L. A., Centrone, M., Hickson, P.
Spectral hole burning reduces sodium laser guide star efficiency. Due to photon recoil, atoms that are initially resonant with the single-frequency laser get Doppler shifted out of resonance, which reduces the return flux. Frequency-chirped (also kno
Externí odkaz:
http://arxiv.org/abs/2112.00252
Autor:
Bustos, F. Pedreros, Holzlöhner, R., Rochester, S., Calia, D. Bonaccini, Hellemeier, J., Budker, D.
We numerically study a method to increase the photon return flux of continuous-wave laser guide stars using one-dimensional atomic cooling principles. The method relies on chirping the laser towards higher frequencies following the change in velocity
Externí odkaz:
http://arxiv.org/abs/2001.02717
Autor:
Vogt, F. P. A., Álvarez, J. L., Calia, D. Bonaccini, Hackenberg, W., Bourget, P., Aranda, I., Bellhouse, C., Blanchard, I., Cerda, S., Cid, C., Comin, M., Contreras, M. Espinoza, Hau, G., Hibon, P., Holzlöhner, R., Jaffé, Y. L., Kolb, J., Kuntschner, H., Madec, P. -Y., Mieske, S., Milli, J., Opitom, C., Parraguez, D., Romero, C., Selman, F., Schmidtobreick, L., Smoker, J., Urrutia, S. Vera, Zins, G.
Publikováno v:
A&A 618, L7 (2018)
The first observations of laser guide star photons Raman-scattered by air molecules above the Very Large Telescope (VLT) were reported in June 2017. The initial detection came from the Multi-Unit Spectroscopic Explorer (MUSE) optical integral field s
Externí odkaz:
http://arxiv.org/abs/1810.01419
Autor:
Vogt, F. P. A., Calia, D. Bonaccini, Hackenberg, W., Opitom, C., Comin, M., Schmidtobreik, L., Smoker, J., Blanchard, I., Contreras, M. Espinoza, Aranda, I., Milli, J., Jaffe, Y. L., Selman, F., Kolb, J., Hibon, P., Kuntschner, H., Madec, P. -Y.
(Abr.) Laser guide stars employed at astronomical observatories provide artificial wavefront reference sources to help correct (in part) the impact of atmospheric turbulence on astrophysical observations. Following the recent commissioning of the 4 L
Externí odkaz:
http://arxiv.org/abs/1706.07050
Autor:
Basden, A. G., Bardou, L., Calia, D. Bonaccini, Buey, T., Centrone, M., Chemla, F., Gach, J. L., Gendron, E., Gratadour, D., Guidolin, I., Jenkins, D. R., Marchetti, E., Morris, T. J., Myers, R. M., Osborn, J., Reeves, A. P., Reyes, M., Rousset, G., Lombardi, G., Townson, M. J., Vidal, F.
The performance of adaptive optics systems is partially dependant on the algorithms used within the real-time control system to compute wavefront slope measurements. We demonstrate use of a matched filter algorithm for the processing of elongated las
Externí odkaz:
http://arxiv.org/abs/1702.03736
Measurement of magnetic fields on the few-hundred-kilometer length scale is significant for a variety of geophysical applications including mapping of crustal magnetism and ocean-circulation measurements, yet available techniques for such measurement
Externí odkaz:
http://arxiv.org/abs/0912.4310
Autor:
Holzlohner, R., Rochester, S. M., Calia, D. Bonaccini, Budker, D., Higbie, J. M., Hackenberg, W.
Context: Sodium laser guide stars (LGS) are about to enter a new range of laser powers. Previous theoretical and numerical methods are inadequate for accurate computations of the return flux and hence for the design of the next-generation LGS systems
Externí odkaz:
http://arxiv.org/abs/0908.1527
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