Single-Frequency Sisyphus Cooling of Lithium in the Presence of a Dipole Trap

We have applied a single-frequency large-detuning Sisyphus cooling technique (originally demonstrated with $^7$Li in free space: Hamilton \textit{et al.} PRA \textbf{89} 023409) to enhance capture of $^6$Li atoms in a NIR dipole trap. We report on the effectiveness of 1D and 2D Sisyphus cooling in the absence of other fields, and in the presence of crossed-beam traps up to 1 mK deep. The cooling technique is relatively insensitive to polarization, detuning, and magnetic fields. We expect to be able to enhance capture of both lithium isotopes simultaneously with a single-frequency Sisyphus beam detuned between the $^6$Li $D_2$ and $^7$Li $D_1$ lines.