Cooling mechanisms in potassium magneto-optical traps

Fort, C.; Bambini, A.; Cacciapuoti, L.; Cataliotti, F. S.; Prevedelli, M.; Tino, G. M.; Inguscio, M.

doi:10.1007/s100530050154

Cited by 26 publications

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“…These atoms however suffer from narrow hyperfine structures in their D2 excited state (see fig. 1) preventing from efficient subdoppler cooling with light far red-detuned from the cycling transition [10][11][12].…”

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confidence: 99%

Gray-molasses cooling of ³⁹ K to a high phase-space density

Salomon

Fouché

Wang

et al. 2013

EPL

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Abstract. -We present new techniques in cooling 39 K atoms using laser light close to the D1 transition. First, a new compressed-MOT configuration is taking advantage of gray molasses type cooling induced by blue-detuned D1 light. It yields an optimized density of atoms. Then, we use pure D1 gray molasses to further cool the atoms to an ultra-low temperature of 6 µK. The resulting phase-space density is 2 × 10 −4 and will ease future experiments with ultracold potassium. As an example, we use it to directly load up to 3 × 10 7 atoms in a far detuned optical trap, a result that opens the way to the all-optical production of potassium degenerate gases.

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confidence: 99%

Gray-molasses cooling of ³⁹ K to a high phase-space density

Salomon

Fouché

Wang

et al. 2013

EPL

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“…This work represents a decisive step in this direction as we reached a phase-space density of 0.01, with a gain of several orders of magnitude with respect to the state-of-the-art [6].…”

Section: Discussionmentioning

confidence: 85%

Collisional properties of sympathetically cooledK39

et al. 2007

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We report the experimental evidence of the sympathetic cooling of 39 K with 87 Rb down to 1 µK, obtained in a novel tight confining magnetic trap. This allowed us to perform the first direct measurement of the elastic cross section of 39 K below 50 µK. The result obtained for the triplet scattering length, aT = −51(7) Bohr radii, agrees with previous results derived from photoassociation spectra and from Feshbach spectroscopy of 40 K.

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“…Both frequencies required for the MOT are generated from acousto-optical modulators (AOMs). Due to the small hyperfine splitting of potassium, ideal MOT operation requires more than one cycling transition [10] so that the terms "trapping" and "repumping" lasers lose meaning. Following tradition, we refer to the laser connecting the 4p 3/2 manifold to the 4s 1/2 (F = 2) hyperfine state as the trapping laser.…”

Section: Methodsmentioning

confidence: 99%

“…Unfortunately, trapping K in an optical dipole trap is problematic because the sub-Doppler cooling mechanism does not work as in other alkali-metal atoms due to the small excited-state hyperfine splitting. Several groups have tried to apply sub-Doppler cooling to K [9][10][11][12][13], but without success. Therefore, the usual procedure to load K into an optical dipole trap involves magnetic trapping, sympathetic cooling with another species, and finally transferring into an optical dipole trap, where the quantum regime is reached [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Simultaneous loading of39K and Rb into a crossed dipole trap: Characterization and two-body losses

et al. 2013

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In this work, a broadband 1071 nm crossed optical dipole trap was loaded simultaneously from a two-atomicspecies K-Rb magneto-optical trap. The number of atoms loaded into the dipole trap, for both species, was characterized as a function of different laser parameters and loading procedures. The best observed loading procedure for K is explained by the ac Stark shift of the hyperfine states involved in the D 2 transition. For the optimum conditions, the dipole trap has about 3 × 10 6 39 K atoms at an atomic density of 7 × 10 12 cm −3 and 2 × 10 6 Rb atoms at an atomic density of 5 × 10 12 cm −3 , with temperatures of 22 and 10 μK, respectively. Finally, by studying the time evolution of both species trapped in the crossed optical dipole trap, we have observed a nonexponential decay associated with heteronuclear two-body losses. Such losses may be due to KRb photoassociation by the broadband 1071 nm laser.

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Cooling mechanisms in potassium magneto-optical traps

Cited by 26 publications

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Gray-molasses cooling of ³⁹ K to a high phase-space density

Gray-molasses cooling of ³⁹ K to a high phase-space density

Collisional properties of sympathetically cooledK39

Simultaneous loading of39K and Rb into a crossed dipole trap: Characterization and two-body losses

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Cooling mechanisms in potassium magneto-optical traps

Cited by 26 publications

References 0 publications

Gray-molasses cooling of 39 K to a high phase-space density

Gray-molasses cooling of 39 K to a high phase-space density

Collisional properties of sympathetically cooledK39

Simultaneous loading of39K and Rb into a crossed dipole trap: Characterization and two-body losses

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Resources

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Gray-molasses cooling of ³⁹ K to a high phase-space density

Gray-molasses cooling of ³⁹ K to a high phase-space density