2019
DOI: 10.1103/physrevlett.123.033202
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Deep Laser Cooling and Efficient Magnetic Compression of Molecules

Abstract: We introduce a scheme for deep laser cooling of molecules based on robust dark states at zero velocity. By simulating this scheme, we show it to be a widely applicable method that can reach the recoil limit or below. We demonstrate and characterise the method experimentally, reaching a temperature of 5.4(7) µK. We solve a general problem of measuring low temperatures for large clouds by rotating the phase-space distribution and then directly imaging the complete velocity distribution. Using the same phase-spac… Show more

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Cited by 93 publications
(73 citation statements)
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“…In the limit of a small initial cloud, the sample expands in the trap to a size determined by its temperature. In this limiting case the decoherence rate from (i) is 0.14 µK −1 s −1 implying an achievable coherence time of 1.4 s at 5 µK, a temperature that has already been demonstrated for CaF [36,37]. The effect of mechanism (ii) is also related to the cloud size.…”
supporting
confidence: 58%
“…In the limit of a small initial cloud, the sample expands in the trap to a size determined by its temperature. In this limiting case the decoherence rate from (i) is 0.14 µK −1 s −1 implying an achievable coherence time of 1.4 s at 5 µK, a temperature that has already been demonstrated for CaF [36,37]. The effect of mechanism (ii) is also related to the cloud size.…”
supporting
confidence: 58%
“…Weak traps require much lower molecule temperatures than were achieved in recent eEDM experiments, and therefore some form of deeper cooling is necessary. Direct laser cooling of molecules [25][26][27][28][29] has seen rapid growth in recent years; SrF [28,[30][31][32][33][34][35][36], CaF [37][38][39][40][41][42], and YO [43][44][45] have all been laser-slowed, cooled, and transferred to long-lived traps. YbF [46] molecules have been transversely laser-cooled, although not yet cooled in three dimensions.…”
Section: Introductionmentioning
confidence: 99%
“…Recalling that an average of 3 photons are scattered in the optical pumping step, we see that under these conditions, the cooling cycle can be applied 58 times before half the population is lost to a different spin manifold. Considering that molecular samples with temperatures of 5 µK have already been demonstrated by free-space laser cooling [10,11], this number of cycles should be sufficient in many cases. We also note that loss to other spin manifolds is not fatal, since the cooling process could be applied to each spin manifold in turn.…”
Section: Cooling Recipe and Conclusionmentioning
confidence: 99%