Doppler Cooling and Trapping on Forbidden Transitions

Binnewies, T.; Wilpers, G.; Sterr, U.; Riehle, F.; Helmcke, J.; Mehlstäubler, T. E.; Rasel, Ernst M.; Ertmer, W.

doi:10.1103/physrevlett.87.123002

Cited by 157 publications

(121 citation statements)

References 16 publications

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“…A further considerable enhancement in accuracy can only be expected from measurements on laser cooled free falling or in a dipole trap captured atoms in combination with a primary frequency reference with superior stability compared to the presently used Cs clock. Currently we investigate possible experimental strategies [33,34,35,36] to implement a lattice clock, which is expected to improve the current uncertainty in accuracy by several orders of magnitude.…”

Section: Discussionmentioning

confidence: 99%

Absolute frequency measurement of the magnesium intercombination transitionS01→P13

et al. 2008

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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.

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Section: Discussionmentioning

confidence: 99%

Absolute frequency measurement of the magnesium intercombination transitionS01→P13

et al. 2008

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“…Excitation configurations like the ♦ scheme have been investigated in the literature as a model for observing pressure-induced resonances [9], and can be found for instance in experiments with gases of alkali-earth atoms which aim at optical frequency standards [10] or at reaching the quantum degeneracy regime by all-optical means [11]. Our investigation may contribute to the spectroscopy of these systems and to the development of new and efficient methods of laser-cooling.…”

Section: Introductionmentioning

confidence: 94%

Phase-dependent interaction in a four-level atomic configuration

2002

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We study a four-level atomic scheme interacting with four lasers in a closed-loop configuration with a ♦ (diamond) geometry. We investigate the influence of the laser phases on the steady state. We show that, depending on the phases and the decay characteristic, the system can exhibit a variety of behaviors, including population inversion and complete depletion of an atomic state. We explain the phenomena in terms of multi-photon interference. We compare our results with the phasedependent phenomena in the double-Λ scheme, as studied in [Korsunsky and Kosachiov, Phys. Rev A 60, 4996 (1999)]. This investigation may be useful for developing non-linear optical devices, and for the spectroscopy and laser-cooling of alkali-earth atoms.

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“…Narrow spectral lines allow laser cooling of various atoms down to a few tens and units of microkelvin, and even lower. In particular, narrow intercombination transition 4 1 S 0 →4 3 P 1 in 40 Ca (γ≈2π×400 Hz) provides temperatures around 4-6 µK [50,51] just by the help of Doppler cooling process. There were good results with intercombination transitions also for the other elements: Sr [52], Yb [21,53] and Hg [42], for even as well as for odd isotopes.…”

Section: Laser Cooling In Mot: Semiclassical Approximationmentioning

confidence: 99%

Quantum treatment of two-stage sub-Doppler laser cooling of magnesium atoms

et al. 2015

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The problem of deep laser cooling of 24 Mg atoms is theoretically studied. We propose two-stage sub-Doppler cooling strategy using electro-dipole transition 3 3 P2→3 3 D3 (λ = 383.9 nm). The first stage implies exploiting magneto-optical trap with σ + and σ − light beams, while the second one uses a lin⊥lin molasses. We focus on achieving large number of ultracold atoms (T ef f <10 µK) in a cold atomic cloud. The calculations have been done out of many widely used approximations and based on quantum treatment with taking full account of recoil effect. Steady-state average kinetic energies and linear momentum distributions of cold atoms are analyzed for various light field intensities and frequency detunings. The results of conducted quantum analysis have revealed noticeable differences from results of semiclassical approach based on the Fokker-Planck equation. At certain conditions the second cooling stage can provide sufficiently lower kinetic energies of atomic cloud as well as increased fraction of ultracold atoms than the first one. We hope that the obtained results can assist overcoming current experimental problems in deep cooling of 24 Mg atoms by means of laser fields. Cold magnesium atoms, being cooled in large number down to several µK, have certain interest, for example, in quantum metrology.

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Doppler Cooling and Trapping on Forbidden Transitions

Cited by 157 publications

References 16 publications

Absolute frequency measurement of the magnesium intercombination transitionS01→P13

Absolute frequency measurement of the magnesium intercombination transitionS01→P13

Phase-dependent interaction in a four-level atomic configuration

Quantum treatment of two-stage sub-Doppler laser cooling of magnesium atoms

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