Zobrazeno 1 - 10
of 439
pro vyhledávání: '"G Wilpers"'
Publikováno v:
Applied Physics B. 85:31-44
Using a Ca optical frequency standard at 657 nm, we demonstrate a method that reduces uncertainties in absolute frequency measurements of optical transitions using freely expanding neutral atoms. Working with atoms that have been laser cooled to 10
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::504a4340c6b60201e2a0935df3ca34fc
https://doi.org/10.1007/s00340-006-2400-1
https://doi.org/10.1007/s00340-006-2400-1
Autor:
Z. W. Barber, Windell H. Oskay, G. Wilpers, Christopher W. Oates, J. C. Bergquist, Scott A. Diddams, Leo W. Hollberg, C. W. Hoyt
Publikováno v:
Journal of Physics B: Atomic, Molecular and Optical Physics. 38:S469-S495
For more than 100 years, optical atomic/molecular frequency references have played important roles in science and technology, and provide standards enabling precision measurements. Frequency-stable optical sources have been central to experimental te
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::73733898157f8c4946cc7d4be67c0c3c
https://doi.org/10.1088/0953-4075/38/9/003
https://doi.org/10.1088/0953-4075/38/9/003
Autor:
G. Wilpers, Zhiyi Bi, Christopher W. Oates, Long-Sheng Ma, Leo W. Hollberg, Lennart Robertsson, Scott A. Diddams, Robert S. Windeler, Massimo Zucco, Albrecht Bartels
Publikováno v:
IEEE Transactions on Instrumentation and Measurement. 54:746-749
Two types of international comparisons of femtosecond laser frequency combs have been performed in France and the USA. Five combs were involved in the comparisons. Three combs, of which two are transportable, employ nonlinear photonic crystal fiber (
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ca9f5392b3c38f4e3515c9d59eb49b40
https://doi.org/10.1109/tim.2005.843580
https://doi.org/10.1109/tim.2005.843580
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:
Scott A. Diddams, Zhiyi Bi, A. Bartels, Robert S. Windeler, Leo W. Hollberg, G. Wilpers, Christopher W. Oates, Long-Sheng Ma, Massimo Zucco, Lennart Robertsson
Publikováno v:
Science. 303:1843-1845
A femtosecond laser–based optical frequency synthesizer is referenced to an optical standard, and we use it to demonstrate the generation and control of the frequency of electromagnetic fields over 100 terahertz of bandwidth with fractional uncerta
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0a29217e4ab99614d247f4fc63ad2521
https://doi.org/10.1126/science.1095092
https://doi.org/10.1126/science.1095092
Autor:
Zhiyi Bi, Massimo Zucco, A. Bartels, Scott A. Diddams, Christopher W. Oates, Leo W. Hollberg, G. Wilpers, Long-Sheng Ma, Lennart Robertsson, Robert S. Windeler, Kyoungsik Kim
We present measurements and analysis of the currently known relative frequency uncertainty of femtosecond laser frequency combs (FLFCs) based on Kerr-lens mode-locked Ti:sapphire lasers. Broadband frequency combs generated directly from the laser osc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5378a8213ffb65bc6335b39b62a7eec4
Autor:
Leo W. Hollberg, Windell H. Oskay, Steven R. Jefferts, James C. Bergquist, Albrecht Bartels, Christopher W. Oates, Tara M. Fortier, G Wilpers, Scott A. Diddams, Thomas E. Parker, Thomas P. Heavner
We report an absolute frequency measurement of the optical clock transition at 657 nm in 40 Ca with a relative uncertainty of 7.5 × 10 −15 , one of the most accurate frequency measurements of a neutral atom optical transition to date. The frequenc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1df200bac4b554cfe1ed1ba908f1d985
Autor:
Leo W. Hollberg, J. C. Bergquist, Tara M. Fortier, Carol E. Tanner, K. Kim, W.H. Oskay, Christopher W. Oates, Scott A. Diddams, Albrecht Bartels, Eugene Ivanov, Vladislav Gerginov, John J. McFerran, G. Wilpers
Publikováno v:
EQEC '05. European Quantum Electronics Conference, 2005..
This paper discusses the properties of femtosecond laser frequency combs (FLFC) stabilized to optical cavities and atomic transitions. This work also describes the synthesis of low noise microwave frequencies and presents FLFC utilization for high-re
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1a936c3a751b7c39aa3478e8f4b35b25
https://doi.org/10.1109/eqec.2005.1567351
https://doi.org/10.1109/eqec.2005.1567351
Autor:
Christian Lisdat, Paul-Eric Pottie, Fritz Riehle, Juergen Helmcke, H. Stoehr, Burghard Lipphardt, G. Wilpers, Harald Schnatz, C. Degenhardt, Uwe Sterr, T. Nazarova
Publikováno v:
Physical Review A. 72
An optical frequency standard based on an ensemble of neutral calcium atoms laser-cooled to $12\phantom{\rule{0.3em}{0ex}}\ensuremath{\mu}\mathrm{K}$ has been realized. By using ultracold atoms, one major previous source of uncertainty, the residual
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::23401a41a097076465e9b99c73bef82d
https://doi.org/10.1103/physreva.72.062111
https://doi.org/10.1103/physreva.72.062111