Zobrazeno 1 - 10
of 979
pro vyhledávání: '"Holzwarth, R"'
Autor:
Grotti, J., Nosske, I., Koller, S. B., Herbers, S., Denker, H., Timmen, L., Vishnyakova, G., Grosche, G., Waterholter, T., Kuhl, A., Koke, S., Benkler, E., Giunta, M., Maisenbacher, L., Matveev, A., Dörscher, S., Schwarz, R., Al-Masoudi, A., Hänsch, T. W., Udem, T. H., Holzwarth, R., Lisdat, C.
We have measured the geopotential difference between two locations separated by 457 km by comparison of two optical lattice clocks via an interferometric fiber link, utilizing the gravitational redshift of the clock transition frequency. The $^{87}$S
Externí odkaz:
http://arxiv.org/abs/2309.14953
Autor:
Zhao, Fei, Curto, G. Lo, Pasquini, L., Hernández, J. I. González, De Medeiros, J. R., Leão, I. C., Martins, B. L. Canto, Rebolo, R., Mascareño, A. Suárez, Esposito, M., Manescau, A., Steinmetz, T., Udem, T., Probst, R., Holzwarth, R., Zhao, G.
Publikováno v:
A&A 645, A23 (2021)
Aims. We study the 2D spectral line profile of HARPS (High Accuracy Radial Velocity Planet Searcher), measuring its variation with position across the detector and with changing line intensity. The characterization of the line profile and its variati
Externí odkaz:
http://arxiv.org/abs/2011.03391
Autor:
Hernández, J. I. González, Rebolo, R., Pasquini, L., Curto, G. Lo, Molaro, P., Caffau, E., Ludwig, H. -G., Steffen, M., Esposito, M., Mascareño, A. Suárez, Toledo-Padrón, B., Probst, R. A., Hänsch, T. W., Holzwarth, R., Manescau, A., Steinmetz, T., Udem, Th., Wilken, T.
Publikováno v:
A&A 643, A146 (2020)
The General Theory of Relativity predicts the redshift of spectral lines in the solar photosphere, as a consequence of the gravitational potential of the Sun. This effect can be measured from a solar disk-integrated flux spectrum of the Sun's reflect
Externí odkaz:
http://arxiv.org/abs/2009.10558
Autor:
Oelker, E., Hutson, R. B., Kennedy, C. J., Sonderhouse, L., Bothwell, T., Goban, A., Kedar, D., Sanner, C., Robinson, J. M., Marti, G. E., Matei, D. G., Legero, T., Giunta, M., Holzwarth, R., Riehle, F., Sterr, U., Ye, J.
Publikováno v:
Nature Photonics 13, 714-719 (2019)
Improvements in atom-light coherence are foundational to progress in quantum information science, quantum optics, and precision metrology. Optical atomic clocks require local oscillators with exceptional optical coherence due to the challenge of perf
Externí odkaz:
http://arxiv.org/abs/1902.02741
Akademický článek
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Autor:
Löhner-Böttcher, J., Schmidt, W., Schlichenmaier, R., Doerr, H. -P., Steinmetz, T., Holzwarth, R.
Publikováno v:
A&A 617, A19 (2018)
In sunspot umbrae, convection is largely suppressed by the strong magnetic field. Previous measurements reported on negligible convective flows in umbral cores. Based on this, numerous studies have taken the umbra as zero reference to calculate Doppl
Externí odkaz:
http://arxiv.org/abs/1804.08304
Autor:
Loehner-Boettcher, J., Schmidt, W., Doerr, H. -P., Kentischer, T., Steinmetz, T., Probst, R. A., Holzwarth, R.
Publikováno v:
A&A 607, A12 (2017)
LARS is an Absolute Reference Spectrograph designed for ultra-precise solar observations. The high-resolution echelle spectrograph of the Vacuum Tower Telescope is supported by a state-of-the-art laser frequency comb to calibrate the solar spectrum o
Externí odkaz:
http://arxiv.org/abs/1707.01573
Autor:
Probst, R A, Wang, L, Doerr, H-P, Steinmetz, T, Kentischer, T J, Zhao, G, Hänsch, T W, Udem, Th, Holzwarth, R, Schmidt, W
Publikováno v:
New J. Phys. 17, 023048 (2015)
We investigate a new scheme for astronomical spectrograph calibration using the laser frequency comb at the Solar Vacuum Tower Telescope on Tenerife. Our concept is based upon a single-mode fiber channel, that simultaneously feeds the spectrograph wi
Externí odkaz:
http://arxiv.org/abs/1502.04942
Autor:
Molaro, P., Esposito, M., Monai, S., Hernandez, J. I. Gonzalez, Hansch, T. W., Holzwarth, R., Manescau, A., Pasquini, L., Probst, R. A., Rebolo, R., Steinmetz, T., Udem, Th., Wilken, T.
The solar spectrum is a primary reference for the study of physical processes in stars and their variation during activity cycles. In Nov 2010 an experiment with a prototype of a Laser Frequency Comb (LFC) calibration system was performed with the HA
Externí odkaz:
http://arxiv.org/abs/1310.5087
Autor:
Schiller, S., Görlitz, A., Nevsky, A., Alighanbari, S., Vasilyev, S., Abou-Jaoudeh, C., Mura, G., Franzen, T., Sterr, U., Falke, S., Lisdat, Ch., Rasel, E., Kulosa, A., Bize, S., Lodewyck, J., Tino, G. M., Poli, N., Schioppo, M., Bongs, K., Singh, Y., Gill, P., Barwood, G., Ovchinnikov, Y., Stuhler, J., Kaenders, W., Braxmaier, C., Holzwarth, R., Donati, A., Lecomte, S., Calonico, D., Levi, F.
The use of ultra-precise optical clocks in space ("master clocks") will allow for a range of new applications in the fields of fundamental physics (tests of Einstein's theory of General Relativity, time and frequency metrology by means of the compari
Externí odkaz:
http://arxiv.org/abs/1206.3765