Zobrazeno 1 - 10
of 155
pro vyhledávání: '"Fordell, T."'
Publikováno v:
Metrologia 60, 045008 (2023)
We show that in optical clocks based on Rabi interrogation, both laser-frequency and magnetic-field flicker ($1/f$) noise with zero mean can lead to servo errors at the $10^{-18}$ level if the negative-detuning (red) and positive-detuning (blue) side
Externí odkaz:
http://arxiv.org/abs/2306.14781
Publikováno v:
J. Appl. Phys. 132, 124401 (2022)
The motion of an ion in a radiofrequency (rf) Paul trap is described by the Mathieu equation and the associated stability parameters that are proportional to the rf and dc electric field gradients. Here, a higher-order, iterative method to accurately
Externí odkaz:
http://arxiv.org/abs/2209.02290
Autor:
Nissila, J., Fordell, T., Kohopaa, K., Mykkanen, E., Immonen, P., Jabradaghi, R. N., Bardalen, E., Kieler, O., Karlsen, B., Ohlckers, P. A., Behr, R., Manninen, A. J., Govenius, J., Kemppinen, A.
We demonstrate the operation of Josephson junction arrays (JJA) driven by optical pulses generated by a mode-locked laser and an optical time-division multiplexer. A commercial photodiode converts the optical pulses into electrical ones in liquid hel
Externí odkaz:
http://arxiv.org/abs/2009.12352
Autor:
Fordell, T., Lindvall, T.
Publikováno v:
J.Opt.Soc.Am. B 36, 415 (2019)
A frequency-stable, broadband laser is presented for experiments on trapped ions. Since the design is based on widely available semiconductor optical amplifier technology, similar lasers can be realized for virtually any wavelength in the near-infrar
Externí odkaz:
http://arxiv.org/abs/1901.08265
Autor:
Baynham, C F A, Curtis, E A, Godun, R M, Jones, J M, Nisbet-Jones, P B R, Baird, P E G, Bongs, K, Gill, P, Fordell, T, Hieta, T, Lindvall, T, Spidell, M T, Lehman, J H
An atom exposed to an electric field will experience Stark shifts of its internal energy levels, proportional to their polarizabilities. In optical frequency metrology, the Stark shift due to background black-body radiation (BBR) modifies the frequen
Externí odkaz:
http://arxiv.org/abs/1801.10134
Publikováno v:
Optics Letters, Vol. 40, Issue 8, pp. 1822-1825 (2015)
Future transportable optical clocks require compact and reliable light sources. Here, broadband, unpolarized repumper and state clearout sources for Sr+ single-ion optical clocks are reported. These turn-key devices require no frequency stabilization
Externí odkaz:
http://arxiv.org/abs/1504.04443
Publikováno v:
Phys. Rev. A 87, 013439 (2013)
Many ion species commonly used for laser-cooled ion trapping studies have a low-lying metastable 2D3/2 state that can become populated due to spontaneous emission from the 2P1/2 excited state. This requires a repumper laser to maintain the ion in the
Externí odkaz:
http://arxiv.org/abs/1301.5503
Autor:
Guenot, D., Klunder, K., Arnold, C. L., Kroon, D., Dahlstrom, J. M., Miranda, M., Fordell, T., Gisselbrecht, M., Johnsson, P., Mauritsson, J., Lindroth, E., Maquet, A., Taieb, R., L'Huillier, A., Kheifets, A. S.
We present experimental measurements and theoretical calculations of photoionization time delays from the $3s$ and $3p$ shells in Ar in the photon energy range of 32-42 eV. The experimental measurements are performed by interferometry using attosecon
Externí odkaz:
http://arxiv.org/abs/1204.4009
Autor:
Klünder, K., Dahlström, J. M., Gisselbrecht, M., Fordell, T., Swoboda, M., Guénot, D., Johnsson, P., Caillat, J., Mauritsson, J., Maquet, A., Taïeb, R., L'Huillier, A.
We study photoionization of argon atoms excited by attosecond pulses using an interferometric measurement technique. We measure the difference in time delays between electrons emitted from the $3s^2$ and from the $3p^6$ shell, at different excitation
Externí odkaz:
http://arxiv.org/abs/1012.3863
Autor:
Swoboda, M., Fordell, T., Klünder, K., Dahlström, J. M., Miranda, M., Buth, C., Schafer, K. J., Mauritsson, J., L'Huillier, A., Gisselbrecht, M.
Publikováno v:
Physical Review Letters 2010
We study resonant two-color two-photon ionization of Helium via the 1s3p 1P1 state. The first color is the 15th harmonic of a tunable titanium sapphire laser, while the second color is the fundamental laser radiation. Our method uses phase-locked hig
Externí odkaz:
http://arxiv.org/abs/1002.2550