Ultracold Fermi mixtures and simultaneous sub-Doppler laser cooling of fermionic ^{6}Li and ^{40}KReport as inadecuate




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1 LKB Lhomond - Laboratoire Kastler Brossel

Abstract : This thesis reports on novel techniques for experimental studies of ultracold, fermionic lithium and potassium quantum gases. The new parts of our ^{6}Li-^{40}K apparatus are described and characterized. We present a narrow-linewidth, all-solid-state laser source, emitting 5W at 671 nm. We employ the laser source in the context of a novel sup-Doppler cooling mechanism, operating on the D1 atomic transition of alkali atoms, for laser cooling of lithium. This D1 molasses allows us to simultaneously cool a mixture of ^{6}Li and ^{40}K atoms to deep sub-Doppler temperatures, while retaining large atom numbers and high atomic densities. The measured phase space densities after the molasses phase are on the order of 10^{-4} for both ^{6}Li and ^{40}K. The D1 laser cooling paves the way for fast evaporation to quantum degeneracy in magnetic and optical traps. We present the evaporative cooling of ^{40}K atoms. The evaporation starts in an optically plugged magnetic quadrupole trap and continues in an optical dipole trap. At the end of the evaporation, we obtain a quantum degenerate spin-mixture of ^{40}K atoms, with more than 7x10^5 atoms in each of the two spin states and T-T F



Author: Franz Sievers -

Source: https://hal.archives-ouvertes.fr/



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