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We present an efficient scheme to implement a gray optical molasses forsub-Doppler cooling of $^{6}$Li atoms with minimum experimental overhead. Tointegrate the $D_1$ light for the gray molasses (GM) cooling into the sameoptical setup that is used for the $D_2$ light for a standard magneto-opticaltrap (MOT), we rapidly switch the injection seeding of a slave laser betweenthe $D_2$ and $D_1$ light sources. Switching times as short as$30\,\mu\textrm{s}$ can be achieved, inferred from monitor optical beatsignals. The resulting low-intensity molasses cools a sample of $N=9\times10^8$atoms to about $60\,\mu\textrm{K}$. A maximum phase-space density of$\rho=1.2\times10^{-5}$ is observed. On the same setup, the performance of theGM is compared to that of narrow-line cooling in a UV MOT, following theprocedure in Sebastian et al. (2014). Further, we compare the production of adegenerate Fermi gas using both methods. Loading an optical dipole trap fromthe gray molasses yields a quantum degenerate sample with $3.3\times10^5$atoms, while loading from the denser UV MOT yields $2.4\times10^6$ atoms. Wherethe highest atom numbers are not a priority this implementation of the graymolasses technique yields sufficiently large samples at a comparatively lowtechnical effort.

Comparison of an efficient implementation of gray molasses to narrow-line cooling for the all-optical production of a lithium quantum gas