The absolute frequency of the 87Sr optical clock transition

Gretchen K. Campbell; Andrew D. Ludlow; Sebastian Blatt; Jan W. Thomsen; Michael J. Martin; Marcio H. G. de Miranda; Tanya Zelevinsky; Martin M. Boyd; Jun Ye; Scott A. Diddams; Thomas P. Heavner; Thomas E. Parker; Steven R. Jefferts

doi:10.1088/0026-1394/45/5/008

The absolute frequency of the ⁸⁷Sr optical clock transition

Gretchen K. Campbell, Andrew D. Ludlow, Sebastian Blatt, Jan W. Thomsen, Michael J. Martin, Marcio H. G. de Miranda, Tanya Zelevinsky, Martin M. Boyd, Jun Ye, Scott A. Diddams, Thomas P. Heavner, Thomas E. Parker, Steven R. Jefferts

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Abstract

The absolute frequency of the 1S0–3P0 clock transition of 87Sr has been measured to be 429 228 004 229 873.65 (37) Hz using lattice-confined atoms, where the fractional uncertainty of 8.6 × 10-16 represents one of the most accurate measurements of an atomic transition frequency to date. After a detailed study of systematic effects, which reduced the total systematic uncertainty of the Sr lattice clock to 1.5 × 10-16, the clock frequency is measured against a hydrogen maser which is simultaneously calibrated to the US primary frequency standard, the NIST Cs fountain clock, NIST-F1. The comparison is made possible using a femtosecond laser based optical frequency comb to phase coherently connect the optical and microwave spectral regions and by a 3.5 km fibre transfer scheme to compare the remotely located clock signals.

Original language	English
Journal	Metrologia
Volume	45
Issue number	5
Pages (from-to)	539-548
Number of pages	9
ISSN	0026-1394
DOIs	https://doi.org/10.1088/0026-1394/45/5/008
Publication status	Published - 2008

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10.1088/0026-1394/45/5/008

http://adsabs.harvard.edu/abs/2008Metro..45..539C

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@article{a2299ee00c5e11df825d000ea68e967b,

title = "The absolute frequency of the 87Sr optical clock transition",

abstract = "The absolute frequency of the 1S0–3P0 clock transition of 87Sr has been measured to be 429 228 004 229 873.65 (37) Hz using lattice-confined atoms, where the fractional uncertainty of 8.6 × 10-16 represents one of the most accurate measurements of an atomic transition frequency to date. After a detailed study of systematic effects, which reduced the total systematic uncertainty of the Sr lattice clock to 1.5 × 10-16, the clock frequency is measured against a hydrogen maser which is simultaneously calibrated to the US primary frequency standard, the NIST Cs fountain clock, NIST-F1. The comparison is made possible using a femtosecond laser based optical frequency comb to phase coherently connect the optical and microwave spectral regions and by a 3.5 km fibre transfer scheme to compare the remotely located clock signals.",

author = "Campbell, {Gretchen K.} and Ludlow, {Andrew D.} and Sebastian Blatt and Thomsen, {Jan W.} and Martin, {Michael J.} and {de Miranda}, {Marcio H. G.} and Tanya Zelevinsky and Boyd, {Martin M.} and Jun Ye and Diddams, {Scott A.} and Heavner, {Thomas P.} and Parker, {Thomas E.} and Jefferts, {Steven R.}",

year = "2008",

doi = "10.1088/0026-1394/45/5/008",

language = "English",

volume = "45",

pages = "539--548",

journal = "Metrologia",

issn = "0026-1394",

publisher = "Institute of Physics Publishing Ltd",

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TY - JOUR

T1 - The absolute frequency of the 87Sr optical clock transition

AU - Campbell, Gretchen K.

AU - Ludlow, Andrew D.

AU - Blatt, Sebastian

AU - Thomsen, Jan W.

AU - Martin, Michael J.

AU - de Miranda, Marcio H. G.

AU - Zelevinsky, Tanya

AU - Boyd, Martin M.

AU - Ye, Jun

AU - Diddams, Scott A.

AU - Heavner, Thomas P.

AU - Parker, Thomas E.

AU - Jefferts, Steven R.

PY - 2008

Y1 - 2008

N2 - The absolute frequency of the 1S0–3P0 clock transition of 87Sr has been measured to be 429 228 004 229 873.65 (37) Hz using lattice-confined atoms, where the fractional uncertainty of 8.6 × 10-16 represents one of the most accurate measurements of an atomic transition frequency to date. After a detailed study of systematic effects, which reduced the total systematic uncertainty of the Sr lattice clock to 1.5 × 10-16, the clock frequency is measured against a hydrogen maser which is simultaneously calibrated to the US primary frequency standard, the NIST Cs fountain clock, NIST-F1. The comparison is made possible using a femtosecond laser based optical frequency comb to phase coherently connect the optical and microwave spectral regions and by a 3.5 km fibre transfer scheme to compare the remotely located clock signals.

AB - The absolute frequency of the 1S0–3P0 clock transition of 87Sr has been measured to be 429 228 004 229 873.65 (37) Hz using lattice-confined atoms, where the fractional uncertainty of 8.6 × 10-16 represents one of the most accurate measurements of an atomic transition frequency to date. After a detailed study of systematic effects, which reduced the total systematic uncertainty of the Sr lattice clock to 1.5 × 10-16, the clock frequency is measured against a hydrogen maser which is simultaneously calibrated to the US primary frequency standard, the NIST Cs fountain clock, NIST-F1. The comparison is made possible using a femtosecond laser based optical frequency comb to phase coherently connect the optical and microwave spectral regions and by a 3.5 km fibre transfer scheme to compare the remotely located clock signals.

U2 - 10.1088/0026-1394/45/5/008

DO - 10.1088/0026-1394/45/5/008

M3 - Journal article

SN - 0026-1394

VL - 45

SP - 539

EP - 548

JO - Metrologia

JF - Metrologia

IS - 5

ER -

The absolute frequency of the 87Sr optical clock transition

Abstract

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The absolute frequency of the ⁸⁷Sr optical clock transition