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We present an efficient cooling scheme for fermionic $^{40}{\text{K}}$ atoms,using laser light red and blue detuned with respect to the $\mathcal{D}2$ and$\mathcal{D}1$ principle flourescence lines, respectively. The cooling schemeis found to significantly increase the saturation level for loading of a$^{40}{\text{K}}$ magneto-optical trap (MOT), resulting in increased atomnumbers or decreased cycle times. While the attainable $^{40}{\text{K}}$ atomnumber is approximately doubled if exclusively $^{40}{\text{K}}$ atoms arecooled, the scheme is particularly powerful for dual-species MOTs, for example,if $^{40}{\text{K}}$ and $^{87}{\text{Rb}}$ atoms are cooled simultaneously inthe same MOT configuration. The typical atom losses due to light-assistedhetero-nuclear collisions between $^{40}{\text{K}}$ and $^{87}{\text{Rb}}$ seemto be reduced giving rise to a threefold improvement of the $^{40}{\text{K}}$atom number as compared to that in a conventional dual-species MOT, operatingmerely with $\mathcal{D}2$ light. Our scheme can be a useful extension to mostdual-species experiments, aiming to reach simultaneous degeneracy of bothspecies.

Two-colour laser cooling for 40K-87Rb quantum gas mixtures