Zobrazeno 1 - 10
of 20
pro vyhledávání: '"Swanson, Thomas B."'
Publikováno v:
Journal of the Optical Society of America B, Vol. 35, Issue 7, pp. 1557-1562 (2018)
We have characterized the molecular tellurium (Te$_2$) spectrum in the vicinity of the 423nm $^1S_0-^1P_1$ and the 431nm $^3P_1-^3P_0$ transitions in neutral calcium. These transitions are relevant to optical clocks for atomic-beam characterization a
Externí odkaz:
http://arxiv.org/abs/1806.04629
Publikováno v:
Metrologia 54, p.247 (2017)
The fundamental limits of atomic fountains as operational clocks are considered. Four rubidium fountains in operation at the U.S. Naval Observatory for over 5.5 years have demonstrated unprecedented long-term stability for continuously running clocks
Externí odkaz:
http://arxiv.org/abs/1704.01506
Publikováno v:
Journal of Physics: Conference Series 723 (2016) 012004
Four rubidium fountains at the U.S. Naval Observatory (USNO) have been in operation for 4.5 years. Each fountain has demonstrated periods of stability marked by Total or Theo deviation below 10^-16. Occasional frequency changes, on order of 1.5 times
Externí odkaz:
http://arxiv.org/abs/1607.06776
Autor:
Peil, Steven, Hanssen, James L., Swanson, Thomas B., Taylor, Jennifer, Ekstrom, Christopher R.
Publikováno v:
Metrologia 51 (2014) 263-269
An ensemble of rubidium atomic fountain clocks has been put into operation at the U.S. Naval Observatory (USNO). These fountains are used as continuous clocks in the manner of commercial cesium beams and hydrogen masers for the purpose of improved ti
Externí odkaz:
http://arxiv.org/abs/1406.1376
Publikováno v:
Physical Review A 87, 010102(R), 2013
Tests of local position invariance (LPI) made by comparing the relative redshift of atomic clocks based on different atoms have been carried out for a variety of pairs of atomic species. In most cases, several absolute frequency measurements per year
Externí odkaz:
http://arxiv.org/abs/1301.6145
Autor:
Swanson, Thomas B.
A low velocity, low temperature beam of atoms is produced from a two-dimensional magneto-optic trap known as an atomic funnel. The funnel provides simultaneous spatial and velocity compression of atoms and will provide a source for a three-grating at
Externí odkaz:
http://hdl.handle.net/1957/34569
Autor:
Ekstrom, Christopher R., Hanssen, James L., Swanson, Thomas B., Taylor, Jennifer, Peil, Steven
Publikováno v:
2014 IEEE International Frequency Control Symposium (FCS); 2014, p1-4, 4p
Publikováno v:
2012 IEEE International Frequency Control Symposium Proceedings; 1/ 1/2012, p1-4, 4p
Publikováno v:
Frequency Standards & Metrology, Procs of the 6th Symposium; 2002, p80-87, 8p
Publikováno v:
Proceedings of the 2005 IEEE International Frequency Control Symposium & Exposition, 2005; 2005, pVII-XVIII, 12p