Calcium optical frequency standard with ultracold atoms: Approaching<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mn>10</mml:mn><mml:mrow><mml:mo>−</mml:mo><mml:mn>15</mml:mn></mml:mrow></mml:msup></mml:math>relative uncertainty

Degenhardt, C.; Stoehr, Hardo; Lisdat, Christian; Wilpers, G.; Schnatz, H.; Lipphardt, B.; Nazarova, T.; Pottie, Paul-Eric; Sterr, U.; Helmcke, J.; Riehle, F.

doi:10.1103/physreva.72.062111

Cited by 117 publications

(67 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Since then many Ramsey-Bordé interferometers were employed for H, Mg, and Ca atoms and I 2 molecules for precision experiments such as high-resolution spectroscopy ͑Sengstock et al, 1993; Kisters et al, 1994;Huber et al, 1998;Oates et al, 1999;Heupel et al, 2002;Wilpers et al, 2002;Sterr et al, 2004;Degenhardt et al, 2005;Keupp et al, 2005͒ and fundamental studies such as geometric phases; and light shift potentials ͑Muller et Mei et al, 2000;Yanagimachi et al, 2002͒, transition Stark shifts ͑Morinaga et al, 1993Rieger et al, 1993͒ and multiple beam high-finesse atom interferometry ͑Weitz et Hinderthur et al, 1997Hinderthur et al, , 1999Ruschewitz et al, 1998͒, and molecule interferometry ͑Bordé et al, 1994͒.…”

Section: Optical Ramsey-bordé Interferometersmentioning

confidence: 99%

Optics and interferometry with atoms and molecules

2009

View full text Add to dashboard Cite

Interference with atomic and molecular matter waves is a rich branch of atomic physics and quantum optics. It started with atom diffraction from crystal surfaces and the separated oscillatory fields technique used in atomic clocks. Atom interferometry is now reaching maturity as a powerful art with many applications in modern science. In this review the basic tools for coherent atom optics are described including diffraction by nanostructures and laser light, three-grating interferometers, and double wells on atom chips. Scientific advances in a broad range of fields that have resulted from the application of atom interferometers are reviewed. These are grouped in three categories: ͑i͒ fundamental quantum science, ͑ii͒ precision metrology, and ͑iii͒ atomic and molecular physics. Although some experiments with Bose-Einstein condensates are included, the focus of the review is on linear matter wave optics, i.e., phenomena where each single atom interferes with itself.

show abstract

Section: Optical Ramsey-bordé Interferometersmentioning

confidence: 99%

Optics and interferometry with atoms and molecules

2009

View full text Add to dashboard Cite

show abstract

“…Systems using strontium and calcium [2,3,4,5,6,7] have recently been shown to outperform state-ofthe-art Cs clocks in terms of stability and the accuracy of some optical ion frequency standards is already limited by the accuracy of the best Cs clocks [8,9].…”

Section: Introductionmentioning

confidence: 99%

Absolute frequency measurement of the magnesium intercombination transitionS01→P13

et al. 2008

Self Cite

View full text Add to dashboard Cite

Absolute frequency measurement of the magnesium intercombination transition 1 S 0 We report on a frequency measurement of the (3s 2 ) 1 S0 → (3s3p) 3 P1 clock transition of 24 Mg on a thermal atomic beam. The intercombination transition has been referenced to a portable primary Cs frequency standard with the help of a femtosecond fiber laser frequency comb. The achieved uncertainty is 2.5 × 10 −12 which corresponds to an increase in accuracy of six orders of magnitude compared to previous results. The measured frequency value permits the calculation of several other optical transitions from 1 S0 to the 3 PJ -level system for 24 Mg, 25 Mg and 26 Mg. We describe in detail the components of our optical frequency standard like the stabilized spectroscopy laser, the atomic beam apparatus used for Ramsey-Bordé interferometry and the frequency comb generator and discuss the uncertainty contributions to our measurement including the first and second order Doppler effect. An upper limit of 3 × 10 −13 in one second for the short term instability of our optical frequency standard was determined by comparison with a GPS disciplined quartz oscillator.

show abstract

“…In this case the induced shifts can be described by static shifts due to the average (rms) electric field plus small dynamic corrections [12], [13]. The energy shift of the level i due to blackbody radiation is given by…”

Section: Blackbody Radiation Shift a Generalmentioning

confidence: 99%

Tackling the black body shift in a strontium optical lattice clock

et al. 2010

View full text Add to dashboard Cite

Abstract-A major obstacle for optical clocks is the frequency shift due to black body radiation. We discuss how one can tackle this problem in an optical lattice clock; in our case 87 Sr: firstly, by a measurement of the dc Stark shift of the clock transition and, secondly, by interrogating the atoms in a cryogenic environment. Both approaches rely on transporting ultracold atoms over several cm within a probe cycle. We evaluate this approach of mechanically moving the optical lattice and conclude that it is feasible to transport the atoms over 50 mm within 300 ms. With this transport a dc Stark shift measurement will allow to reduce the contribution of the blackbody radiation to the fractional uncertainty below 2 × 10 −17 at room temperature by improving the shift coefficient known only from atomic structure calculations up to now. We propose a cryogenic environment at 77 K that will reduce this contribution to few parts in 10 −18 .

show abstract

Calcium optical frequency standard with ultracold atoms: Approaching10−15relative uncertainty

Cited by 117 publications

References 47 publications

Optics and interferometry with atoms and molecules

Optics and interferometry with atoms and molecules

Absolute frequency measurement of the magnesium intercombination transitionS01→P13

Tackling the black body shift in a strontium optical lattice clock

Contact Info

Product

Resources

About