Výsledky vyhledávání - "Swanson, Thomas A."

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Vapor-cell frequency reference for short-wavelength transitions in neutral calcium

Autor: Taylor, Jennifer, Hemingway, Bryan, Hanssen, James, Swanson, Thomas B., Peil, Steven

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

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Microwave-clock timescale with instability on order of $10^{-17}$

Autor: Peil, Steven, Swanson, Thomas B., Hanssen, James, Taylor, Jennifer

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

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The USNO rubidium fountains

Autor: Peil, Steven, Hanssen, James, Swanson, Thomas B., Taylor, Jennifer, Ekstrom, Christopher R.

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

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Evaluation of Long Term Performance of Continuously Running Atomic Fountains

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

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Tests of local position invariance using continuously running atomic clocks

Autor: Peil, Steven, Crane, Scott, Hanssen, James L., Swanson, Thomas B., Ekstrom, Christopher R.

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

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