Zobrazeno 1 - 10
of 51
pro vyhledávání: '"Jürgen Helmcke"'
Autor:
T. Binnewies, Harald Schnatz, Uwe Sterr, G. Wilpers, Fritz Riehle, C. Degenhardt, Jürgen Helmcke
Publikováno v:
IEEE Transactions on Instrumentation and Measurement. 52:250-254
An optical frequency standard (/spl lambda/=657 nm) based on cold neutral Ca atoms released from a magnetooptical trap has been realized. Systematic contributions to the uncertainty resulting from the residual velocity of the atoms and the accelerati
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c2cc53290806376bd41daa269b7fe0b7
https://doi.org/10.1109/tim.2003.810025
https://doi.org/10.1109/tim.2003.810025
Autor:
Uwe Sterr, G. Wilpers, A. Chernyshov, Jürgen Helmcke, T. Binnewies, Fritz Riehle, C. Degenhardt
Publikováno v:
Applied Physics B: Lasers and Optics. 76:149-156
We have investigated the two major effects that limit the accuracy of an optical frequency standard based on laser-cooled neutral calcium atoms, i.e. the residual Doppler shift and atomic collisions. A new correction method was applied to reduce the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::face7427c59651adc94579eb6f431d4e
https://doi.org/10.1007/s00340-003-1109-7
https://doi.org/10.1007/s00340-003-1109-7
Autor:
Jürgen Helmcke, Hans-Jörg Jodl, Stefan Luding, Rudolf Haag, Hartmut Jex, Dieter Hoffmann, Rainer Müller, Arno Schindlmayr, Dierck-E. Liebscher, Kai Bongs, Klaus Bethge
Publikováno v:
Physik Journal. 55:62-67
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::37e7e6a28df3d26c383cbb1b5512847c
https://doi.org/10.1002/phbl.19990550515
https://doi.org/10.1002/phbl.19990550515
Publikováno v:
Physical Review Letters. 76:18-21
We have determined the frequency of the $^{3}P_{1}$- $^{1}S_{0}$ intercombination transition of atomic ${}^{40}\mathrm{Ca}$ stored in a magneto-optical trap to be $\ensuremath{\nu}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}455986240493.95\mat
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2898f241897cef2ad5cdc297e4dc5dc6
https://doi.org/10.1103/physrevlett.76.18
https://doi.org/10.1103/physrevlett.76.18
Autor:
T. Al-Kassab, G. Zinner, Jürgen Helmcke, S. Großmann, H. Wollenberger, S. Jorda, Didier Blavette, Harald Schnatz, Burghard Lipphardt, M. Holthaus, G. Fasol, Fritz Riehle
Publikováno v:
Physik Journal. 51:919-986
Seit den sechziger Jahren wird weltweit fieberhaft nach einem Emitter fur blaues Licht gesucht, dem enorme praktische Bedeutung zukommt, sofern er die strengen Anforderungen industrieller Anwendbarkeit erfullt. Dieses Rennen hat vor kurzem Nichia Che
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6ae72b587021167a71ad3e8c64a70068
https://doi.org/10.1002/phbl.19950511004
https://doi.org/10.1002/phbl.19950511004
Publikováno v:
Applied Physics B Laser and Optics. 60:205-209
Consecutive, phase-coherent, near-resonant optical excitations of atoms have been used to realize an atom interferometer with a beam of thermal calcium atoms. We have measured the topological phase shift due to the interaction of a static electric fi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4a77e27d6dd4dfd03a71b98434b9c057
https://doi.org/10.1007/bf01135864
https://doi.org/10.1007/bf01135864
Autor:
Ralf Malz, Charles K. Rhodes, Katsumi Midorikawa, Frank Rohlfing, Hartmut Hillmer, Thomas Kusserow, Evgeny Schneidmiller, Peter Simon, A. Borsutzky, Stefano Longhi, Gerd Marowsky, Orazio Svelto, Markus W. Sigrist, Frank J. Duarte, Stefan Kuck, Mikhail Yurkov, Michele Gianella, Jeffrey Kaiser, Evgeny Saldin, Markus Pollnau, Joachim Hein, Johannes A. L'huillier, Jürgen Helmcke, Giuseppe Della Valle, Roland Sauerbrey, Steffen Steinberg, Günter Huber, Rainer Engelbrecht, Klaus Mann, Helen Wächter, Hans Brand, Fritz Riehle
Publikováno v:
Springer Handbook of Lasers and Optics ISBN: 9783642194085
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5fe9189b29dc305f959d6d8dfbee1a37
https://doi.org/10.1007/978-3-642-19409-2_11
https://doi.org/10.1007/978-3-642-19409-2_11
Publikováno v:
Applied Physics B Lasers and Optics. 59:89-98
We report on high-resolution spectroscopy with two different samples of calcium atoms, in a laser-cooled and deflected beam and in a magneto-optical trap. The atomic beam was excited by spatially separated laser fields. For spectroscopy with stored a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1f6aef713c8fb86f5e5bc3bac71c2cd1
https://doi.org/10.1007/bf01081159
https://doi.org/10.1007/bf01081159
Publikováno v:
Applied Physics B Photophysics and Laser Chemistry. 54:333-340
Separated field excitation of a calcium atomic beam using four traveling laser fields represents two distinct atom interferometers utilizing the internal degrees of freedom of the atoms. Phase shifts between the atomic partial waves have been realize
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::93a831e8654cfd53e2f0335e9ac7e23a
https://doi.org/10.1007/bf00325376
https://doi.org/10.1007/bf00325376
Publikováno v:
Physica Scripta. :32-39
Physics and experimental results of atom interferometry are reviewed and several realizations of atom interferometers are summarized. As a typical example of an atom interferometer utilizing the internal degrees of freedom of the atom, we discuss the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e54f4c00c04b140fc6e5e434616d1741
https://doi.org/10.1088/0031-8949/1992/t40/004
https://doi.org/10.1088/0031-8949/1992/t40/004