Zobrazeno 1 - 10
of 263
pro vyhledávání: '"UDEM, TH."'
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
Akademický článek
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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
Publikováno v:
Phys. Rev. A 85, 023427 (2012)
We report on observations of thermal motion of a single, Doppler-cooled ion along the axis of a linear radio-frequency quadrupole trap. We show that for a harmonic potential the thermal occupation of energy levels leads to Gaussian distribution of th
Externí odkaz:
http://arxiv.org/abs/1203.0177
Autor:
Saathoff, G., Reinhardt, S., Holzwarth, R., Hänsch, T. W., Udem, Th., Bing, D., Schwalm, D., Wolf, A., Karpuk, S., Huber, G., Novotny, C., Botermann, B., Geppert, C., Nörtershäuser, W., Kühl, T., Stöhlker, T., Gwinner, G.
Publikováno v:
Eur. Phys. J. C (2011) 71: 1596
In an article "Missing Transverse-Doppler Effect in Time-Dilation Experiments with High-Speed Ions" by S. Devasia [arXiv:1003.2970v1], our recent Doppler shift experiments on fast ion beams are reanalyzed. Contrary to our analysis, Devasia concludes
Externí odkaz:
http://arxiv.org/abs/1102.5657
Autor:
Batteiger, V., Knünz, S., Herrmann, M., Saathoff, G., Schüssler, H. A., Bernhardt, B., Wilken, T., Holzwarth, R., Hänsch, T. W., Udem, Th.
We apply a recently demonstrated method for precision spectroscopy on strong transitions in trapped ions to measure both fine structure components of the 3s-3p transition in 24-Mg+ and 26-Mg+. We deduce absolute frequency reference data for transitio
Externí odkaz:
http://arxiv.org/abs/0907.0368
Autor:
Kolachevsky, N., Matveev, A., Alnis, J., Parthey, C., Steinmetz, T., Wilken, T., Holzwarth, R., Udem, Th., Haensch, T. W.
In this review we discuss the progress of the past decade in testing for a possible temporal variation of the fine structure constant $\alpha$. Advances in atomic sample preparation, laser spectroscopy and optical frequency measurements led to rapid
Externí odkaz:
http://arxiv.org/abs/0904.1663
We demonstrate a method for precision spectroscopy on trapped ions in the limit of unresolved motional sidebands. By sympathetic cooling of a chain of crystallized ions we suppress adverse temperature variations induced by the spectroscopy laser that
Externí odkaz:
http://arxiv.org/abs/0808.4061
Publikováno v:
Phys. Rev. A 77, 053809 (2008)
We achieved a 0.5 Hz optical beat note line width with ~ 0.1 Hz/s frequency drift at 972 nm between two external cavity diode lasers independently stabilized to two vertically mounted Fabry-Perot (FP) reference cavities. Vertical FP reference cavitie
Externí odkaz:
http://arxiv.org/abs/0801.4199