Zobrazeno 1 - 10
of 207
pro vyhledávání: '"Alnis, J."'
Autor:
Cooke, D. A., Crivelli, P., Alnis, J., Antognini, A., Brown, B., Friedreich, S., Gabard, A., Haensch, T. W., Kirch, K., Rubbia, A., Vrankovic, V.
We report the first observation of the annihilation of positronium from the 2S state. Positronium (Ps) is excited with a two-photon transition from the 1S to the 2S state where its lifetime is increased by a factor of eight compared to the ground sta
Externí odkaz:
http://arxiv.org/abs/1503.05755
Publikováno v:
Optics Letters 36, 4299 (2011)
We report on a low-noise diode laser oscillator at 972 nm actively stabilized to an ultra-stable vibrationally- and thermally compensated reference cavity. To increase the fraction of laser power in the carrier we designed a 20 cm long external cavit
Externí odkaz:
http://arxiv.org/abs/1107.1649
We have stabilized an external cavity diode laser to a whispering gallery mode resonator formed by a protrusion of a single-crystal magnesiumdifluoride cylinder. The cylinder's compact dimensions (<1 cm^3) reduce the sensitivity to vibrations and sim
Externí odkaz:
http://arxiv.org/abs/1102.4227
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
Publikováno v:
Phys. Rev. Lett. 102, 213002 (2009)
An optical measurement of the 2S hyperfine interval in atomic hydrogen using two-photon spectroscopy of the 1S-2S transition gives a value of 177 556 834.3(6.7) Hz. The uncertainty is 2.4 times smaller than achieved by our group in 2003 and more than
Externí odkaz:
http://arxiv.org/abs/0812.3509
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
We demonstrate a novel compact solid-state laser source for high-resolution two-photon spectroscopy of the $1S-2S$ transition in atomic hydrogen. The source emits up to 20 mW at 243 nm and consists of a 972 nm diode laser, a tapered amplifier, and tw
Externí odkaz:
http://arxiv.org/abs/physics/0511162
Akademický článek
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Akademický článek
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Autor:
Predehl, K., Grosche, G., Raupach, S. M. F., Droste, S., Terra, O., Alnis, J., Legero, Th., Hänsch, T. W., Udem, Th., Holzwarth, R., Schnatz, H.
Publikováno v:
Science, 2012 Apr . 336(6080), 441-444.
Externí odkaz:
http://dx.doi.org/10.1126/science.1218442
