Zobrazeno 1 - 10
of 173
pro vyhledávání: '"B Lipphardt"'
Autor:
B M Roberts, P Delva, A Al-Masoudi, A Amy-Klein, C Bærentsen, C F A Baynham, E Benkler, S Bilicki, S Bize, W Bowden, J Calvert, V Cambier, E Cantin, E A Curtis, S Dörscher, M Favier, F Frank, P Gill, R M Godun, G Grosche, C Guo, A Hees, I R Hill, R Hobson, N Huntemann, J Kronjäger, S Koke, A Kuhl, R Lange, T Legero, B Lipphardt, C Lisdat, J Lodewyck, O Lopez, H S Margolis, H Álvarez-Martínez, F Meynadier, F Ozimek, E Peik, P-E Pottie, N Quintin, C Sanner, L De Sarlo, M Schioppo, R Schwarz, A Silva, U Sterr, Chr Tamm, R Le Targat, P Tuckey, G Vallet, T Waterholter, D Xu, P Wolf
Publikováno v:
New Journal of Physics, Vol 22, Iss 9, p 093010 (2020)
We search for transient variations of the fine structure constant using data from a European network of fiber-linked optical atomic clocks. By searching for coherent variations in the recorded clock frequency comparisons across the network, we signif
Externí odkaz:
https://doaj.org/article/e2e070ab3cec4b40854dc0882b271fe7
Autor:
R. Schwarz, S. Dörscher, A. Al-Masoudi, E. Benkler, T. Legero, U. Sterr, S. Weyers, J. Rahm, B. Lipphardt, C. Lisdat
Publikováno v:
Physical Review Research, Vol 2, Iss 3, p 033242 (2020)
We report on a series of 42 measurements of the transition frequency of the 429 THz (5s^{2}) ^{1}S_{0}–(5s5p) ^{3}P_{0} line in ^{87}Sr taken over three years from 2017 to 2019. They were performed at the Physikalisch-Technische Bundesanstalt (PTB)
Externí odkaz:
https://doaj.org/article/f880f43294e54ca9a5ca23d0ecef6ce1
Akademický článek
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Akademický článek
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Autor:
J, Leute, N, Huntemann, B, Lipphardt, Christian, Tamm, P B R, Nisbet-Jones, S A, King, R M, Godun, J M, Jones, H S, Margolis, P B, Whibberley, A, Wallin, M, Merimaa, P, Gill, E, Peik
Publikováno v:
IEEE transactions on ultrasonics, ferroelectrics, and frequency control. 63(7)
We used precise point positioning, a well-established GPS carrier-phase frequency transfer method to perform a direct remote comparison of two optical frequency standards based on single laser-cooled [Formula: see text] ions operated at the National
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=pmid________::8cc5f40168adbeddd349bec2781c7ead
https://pubmed.ncbi.nlm.nih.gov/26863657
https://pubmed.ncbi.nlm.nih.gov/26863657
Publikováno v:
Physical review letters. 116(6)
We experimentally investigate an optical frequency standard based on the (2)S1/2(F=0)→(2)F7/2(F=3) electric octupole (E3) transition of a single trapped (171)Yb+ ion. For the spectroscopy of this strongly forbidden transition, we utilize a Ramsey-t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=pmid________::3c0c5b00bf89ac41f43107eaaece7d70
https://pubmed.ncbi.nlm.nih.gov/26918984
https://pubmed.ncbi.nlm.nih.gov/26918984
Publikováno v:
Physical review letters. 113(21)
Accurate measurements of different transition frequencies between atomic levels of the electronic and hyperfine structure over time are used to investigate temporal variations of the fine structure constant α and the proton-to-electron mass ratio μ
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=pmid________::784f4562421c1366c4cf3ab8881a3ab1
https://pubmed.ncbi.nlm.nih.gov/25479483
https://pubmed.ncbi.nlm.nih.gov/25479483
Publikováno v:
Optics Communications. 151:229-234
We report an absolute frequency measurement of the E-line of CH4 at 88 THz interrogated by a Zeeman-tuned 3.39 μm He–Ne laser using a phase-coherent frequency measurement chain linking to a Cs-clock. We find a value of νE=88 373 149 028 553±200
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::30c2dd37b14bf9172634d77c8f541751
https://doi.org/10.1016/s0030-4018(98)00107-2
https://doi.org/10.1016/s0030-4018(98)00107-2
Publikováno v:
IEEE Transactions on Instrumentation and Measurement. 46:174-177
An optical double-frequency phase comparator is proposed for detection of sub-Doppler saturated dispersion resonances of the OsO/sub 4/-absorber. This technique exhibits high sensitivity and small dependence of the background on the optical geometry.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::62b250650067a71d6e174a8f1a6a7d1e
https://doi.org/10.1109/19.571805
https://doi.org/10.1109/19.571805
Publikováno v:
IEEE Journal of Quantum Electronics. 31:2177-2182
A new version of a transportable double-mode He-Ne/CH/sub 4/ laser (3.39 /spl mu/m) stabilized on the resolved hyperfine structure (HFS) of the F/sub 2//sup (2/) methane line was designed at Lebedev Physical Institute. Absolute frequency measurements
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::29eac5762ad677e90b1766b1e04c65b3
https://doi.org/10.1109/3.477744
https://doi.org/10.1109/3.477744