Frequency measurement of a Sr lattice clock using an SI-second-referenced optical frequency comb linked by a global positioning system (GPS)

Hong, Feng−Lei; Takamoto, Masao; Higashi, Ryoichi; Fukuyama, Yasuhiro; Jiang, Jie; Katori, Hidetoshi

doi:10.1364/opex.13.005253

Cited by 22 publications

(12 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…3 6) Hz, the final uncertainty is calculated by considering both the statistical error and the systematical error. The result is in agree with the former measurements [8,11] by University of Innsbruck and the NICT, also the frequency value recommended by CIPM [10] within their uncertainties. The systematic errors for the clock transition frequency (Table I) considered above are all smaller than 1×10 -15 .…”

Section: Casupporting

confidence: 92%

“…The clock transition frequency had been measured referenced to the Cs fountain at uncertainties on the order of 10 -15 [3][4][5][6][7][8][9]. A Sr lattice clock frequency had been measured referenced to GPS as a link to the SI second by National Metrology Institute of Japan/National Institute of Advanced Industrial Science and Technology (NMIJ/AIST) at the uncertainties on the order of 10 -14 level [10]. With the developments of the precise measurements on the optical frequency standard either based on single trapped ion or ultracold neutral atoms, lasers (optical local oscillators) frequency stabilized to the transitions of atoms/ions were recommended by the International Committee for Weights and Measures (CIPM) as secondary representations of the SI second, contributing to International Atomic Time (TAI) [11].…”

mentioning

confidence: 99%

See 1 more Smart Citation

Hertz-level measurement of the40Ca+4s
Huang
¹
,
Cao
²
,
Liu
³

et al. 2012
Phys. Rev. A
60
0
42
0
View full text Add to dashboard Cite

We report a frequency measurement of the clock transition of a single 40 Ca + ion trapped and laser cooled in a miniature ring Paul trap with 10 -15 level uncertainty. In the measurement, we used an optical frequency comb referenced to a Hydrogen maser, which was calibrated to the SI second through the Global Positioning System (GPS). Optical frequency standards have been developed rapidly in recent years thanks to the development of the cold atoms, the optical frequency comb technology [1,2] and the ultra-narrow-linewidth lasers. Optical frequency standards are expected to replace the Cs primary microwave standard as in the definition of the SI second in the near future. The measurement of the absolute optical frequency for the clock transition is an important step in the development of the optical frequency standards based on single ions and ultracold neutral atoms. The clock transition frequency had been measured using the optical frequency comb referenced to the Cs fountain and using GPS as a link to the SI second without a primary standard for direct calibration. The clock transition frequency had been measured referenced to the Cs fountain at uncertainties on the order of 10 level, which was referenced to the Cs atomic fountain clock [13].In this paper, we report on the first measurements of the 40 Ca + 4s 2 S 1/2 -3d 2 D 5/2 transition frequency with an uncertainty level of 10 -15 using an optical frequency comb referenced to a Hydrogen maser, which was calibrated through the Global Positioning System (GPS) as a link to the SI second. To approach a measurement of 10 -15 level accuracy, we performed the measurement for a very long time (7×10 5 s in May and 1.5×10 6 s in June) to reduce the statistical error and the frequency transfer error. At the same time, the systematic error had been reduced to be smaller than the previous work [14] by achieving the lower ion temperature and increasing the measurement precision on the electric quadrupole shift. Figure 1 is a schematic diagram of our experimental setup. Full details of the laser cooling, trapping detecting and probing system including the locking scheme of probe laser to the ion transitions used in this work were reported in previous works [14][15][16][17]. Briefly, a single 40 Ca + ion was trapped and cooled in a miniature Paul ring trap. The trap had an endcap-to-center distance of z 0  0.6mm with a center-to-

show abstract

Section: Casupporting

confidence: 92%

mentioning

confidence: 99%

Hertz-level measurement of the40Ca+4s
Huang
¹
,
Cao
²
,
Liu
³

et al. 2012
Phys. Rev. A
60
0
42
0
View full text Add to dashboard Cite

show abstract

“…Instead of the commercial Cs clock that was used as a local time base in our previous frequency measurement, 12), 28) we moved an H-maser (Kvarz, Model CH1-75A)…”

Section: Frequency Measurementmentioning

confidence: 99%

“…12), 28) Later the JILA group measured the frequency and found it to be 429,228,004,229,869(19) Hz. 18) The measurement results obtained by the two groups were in poor agreement at a level of three times the combined uncertainties.…”

Section: Introductionmentioning

confidence: 99%

Improved Frequency Measurement of a One-Dimensional Optical Lattice Clock with a Spin-Polarized Fermionic⁸⁷Sr Isotope

et al. 2006

Self Cite

View full text Add to dashboard Cite

We demonstrate a one-dimensional optical lattice clock with a spin-polarized fermionic isotope designed to realize a collision-shift-free atomic clock with neutral atom ensembles.To reduce systematic uncertainties, we developed both Zeeman shift and vector light-shift cancellation techniques. By introducing both an H-maser and a Global Positioning System (GPS) carrier phase link, the absolute frequency of the 1 S 0 (F = 9/2) − 3 P 0 (F = 9/2) clock transition of the 87 Sr optical lattice clock is determined as 429,228,004,229,875(4) Hz, where the uncertainty is mainly limited by that of the frequency link. The result indicates that the Sr lattice clock will play an important role in the scope of the redefinition of the "second"by optical frequency standards.

show abstract

“…This is mostly due to the fact that molecular iodine has strong and narrow absorption lines near 532 nm. Applications using the Nd:YAG laser include a flywheel oscillator or an absolute frequency marker for an optical frequency comb [8][9][10][11], interferometric measurements of gauge blocks [12], gravitational wave detection [13][14][15], and a laser strainmeter for observing earth tides and earthquakes [16].…”

Section: Introductionmentioning

confidence: 99%

A compact iodine-laser operating at 531 nm with stability at the 10$^{-12}$ level and using a coin-sized laser module

Kobayashi,

Akamatsu,

Hosaka

et al. 2015

Preprint

Self Cite

View full text Add to dashboard Cite

We demonstrate a compact iodine-stabilized laser operating at 531 nm using a coin-sized light source consisting of a 1062-nm distributed-feedback diode laser and a frequency-doubling element. A hyperfine transition of molecular iodine is observed using the light source with saturated absorption spectroscopy. The light source is frequency stabilized to the observed iodine transition and achieves frequency stability at the 10 −12 level. The absolute frequency of the compact laser stabilized to the a 1 hyperfine component of the R(36)32 − 0 transition is determined as 564 074 632 419(8) kHz with a relative uncertainty of 1.4 × 10 −11 . The iodine-stabilized laser can be used for various applications including interferometric measurements.

show abstract

Frequency measurement of a Sr lattice clock using an SI-second-referenced optical frequency comb linked by a global positioning system (GPS)

Cited by 22 publications

References 1 publication

Hertz-level measurement of the40Ca+4s
Huang
¹
,
Cao
²
,
Liu
³

et al. 2012
Phys. Rev. A
60
0
42
0
View full text Add to dashboard Cite

Hertz-level measurement of the40Ca+4s
Huang
¹
,
Cao
²
,
Liu
³

et al. 2012
Phys. Rev. A
60
0
42
0
View full text Add to dashboard Cite

Improved Frequency Measurement of a One-Dimensional Optical Lattice Clock with a Spin-Polarized Fermionic⁸⁷Sr Isotope

A compact iodine-laser operating at 531 nm with stability at the 10$^{-12}$ level and using a coin-sized laser module

Contact Info

Product

Resources

About

Frequency measurement of a Sr lattice clock using an SI-second-referenced optical frequency comb linked by a global positioning system (GPS)

Cited by 22 publications

References 1 publication

Hertz-level measurement of the40Ca+4sHuang1, Cao2, Liu3 et al. 2012Phys. Rev. A600420View full textAdd to dashboardCite

Hertz-level measurement of the40Ca+4sHuang1, Cao2, Liu3 et al. 2012Phys. Rev. A600420View full textAdd to dashboardCite

Improved Frequency Measurement of a One-Dimensional Optical Lattice Clock with a Spin-Polarized Fermionic87Sr Isotope

A compact iodine-laser operating at 531 nm with stability at the 10$^{-12}$ level and using a coin-sized laser module

Contact Info

Product

Resources

About

Hertz-level measurement of the40Ca+4s
Huang
¹
,
Cao
²
,
Liu
³

et al. 2012
Phys. Rev. A
60
0
42
0
View full text Add to dashboard Cite

Hertz-level measurement of the40Ca+4s
Huang
¹
,
Cao
²
,
Liu
³

et al. 2012
Phys. Rev. A
60
0
42
0
View full text Add to dashboard Cite

Improved Frequency Measurement of a One-Dimensional Optical Lattice Clock with a Spin-Polarized Fermionic⁸⁷Sr Isotope