Quantum Electronics and Laser Science Conference

Quenched narrow-line cooling in neutral calcium

E. A. Curtis, Chris W. Oates, Leo W. Hollberg

Published Jun 25, 2003• 0 citations

Abstract

Summary form only given. We are presently investigating various schemes for quenched cooling in 3D, which should give sub-recoil temperatures and higher transfer efficiencies. Such samples should produce significant improvement in the performance of optical frequency standards as well as open the door to other applications, enabling efficient loading of dipole traps and higher phase space densities.

DOI: 10.1109/qels.2002.1031081

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Quantum Electronics and Laser Science Conference

Quenched narrow-line cooling in neutral calcium

E. A. Curtis, Chris W. Oates, Leo W. Hollberg

Published Jun 25, 2003• 0 citations

Publisher

Abstract

DOI: 10.1109/qels.2002.1031081

Related papers

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We present an efficient scheme to implement a gray optical molasses for sub-Doppler cooling of

^{6}\mathrm{Li}

atoms with minimum experimental overhead. To integrate the

{D}_{1}

light for the gray molasses cooling into the same optical setup that is used for the

{D}_{2}

light for a standard magneto-optical trap (MOT), we rapidly switch the injection seeding of a slave laser between the

{D}_{2}

and the

{D}_{1}

light sources. Switching times as short as 30 $\ensuremath{\mu}\mathrm{s}$ can be achieved, inferred from monitor optical beat signals. The resulting low-intensity molasses cools a sample of $N=9\ifmmode\times\else\texttimes\fi{}{10}^{8}$ atoms to about 60 $\ensuremath{\mu}\mathrm{K}$. A maximum phase-space density of $\ensuremath{\rho}=1.2\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$ is observed. On the same setup, the performance of the GM is compared to that of narrow-line cooling in an ultraviolet (UV) MOT, following the procedure in Sebastian et al. [J. Sebastian, Ch. Gross, K. Li, H. C. J. Gan, W. Li, and K. Dieckmann, Phys. Rev. A 90, 033417 (2014)]. Further, we compare the production of a degenerate Fermi gas using both methods. Loading an optical dipole trap from the gray molasses yields a quantum degenerate sample with $3.3\ifmmode\times\else\texttimes\fi{}{10}^{5}$ atoms, while loading from the denser UV MOT yields $2.4\ifmmode\times\else\texttimes\fi{}{10}^{6}$ atoms. Where the highest atom numbers are not a priority this implementation of the gray molasses technique yields sufficiently large samples for a comparatively low technical effort.

Subrecoil Raman laser cooling of

lt;sup

gt;6

lt;/sup

gt;Li atoms