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Volumn 81, Issue 4, 2010, Pages

All-optical production of a degenerate mixture of Li6 and K40 and creation of heteronuclear molecules

Author keywords

[No Author keywords available]

Indexed keywords

ALL-OPTICAL; FESHBACH RESONANCES; HETERONUCLEAR MOLECULES; MOLECULE FORMATION; STATE PREPARATION; SYMPATHETIC COOLING; TRAP LOADING;

EID: 77951713045     PISSN: 10502947     EISSN: 10941622     Source Type: Journal    
DOI: 10.1103/PhysRevA.81.043637     Document Type: Article
Times cited : (65)

References (51)
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    • The rf transition frequencies for Li and K are 39 and 69 MHz, respectively. The π-pulses are approximately rectangular and have a total duration of 43 μs (333 μs) for K (Li). The duration of the Li pulse is much longer than that of the K pulse, because less rf power is available. The full width of the dominant central peak in the Fourier spectrum is 46 kHz for K and 6 kHz for Li. We can achieve transfer efficiencies higher than 99%.
    • The rf transition frequencies for Li and K are 39 and 69 MHz, respectively. The π -pulses are approximately rectangular and have a total duration of 43 μ s (333 μ s) for K (Li). The duration of the Li pulse is much longer than that of the K pulse, because less rf power is available. The full width of the dominant central peak in the Fourier spectrum is 46 kHz for K and 6 kHz for Li. We can achieve transfer efficiencies higher than 99 %.
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    • A slight off-resonant contribution of atoms in the K | 2 state is visible on K | 1 images. Since this contribution has a much larger spatial extent than the cloud of molecules, it is possible to correct for it when extracting data from the image. We also account for unpaired atoms not transferred by the rf pulse by independently measuring the π -pulse transfer efficiency.
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    • Li|2 atoms are directly imaged using a probe beam of appropriate frequency. Since we do not have a probe beam with the correct frequency to image K|2 atoms, we first transfer those atoms back to state |1 using another π-pulse and then take the image using the same K|1 probe beam as before. Atoms imaged on the first set of pictures have been accelerated and heated by the probe beam flash and have dispersed enough at the time the second image is taken to not influence it.
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    • The offset in dependence of the magnetic field originates from imperfect frequency adjustment of the K π-pulse and was determined by experiments during which molecule formation was inhibited by removing Li|1 from the sample with a short flash of resonant light before the molecule association magnetic field ramp. The offset is 1% at 168.9 G and rises to 10% 1.5 G away from that position.
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    • A strong influence of broadband laser light on the lifetime of molecules was observed in experiments on cesium Feshbach molecules in Innsbruck. The lifetime substantially increased when the trapping light was provided by a single-frequency infrared laser.


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