Progress towards building lattice atom interferometer using $^{7}$Li

We are building an atom interferometer using $^{7}$Li atoms for the ultimate goal to test the universality of free fall. To deal with light mass of lithium and its large recoil velocity, we will develop a new technique using an optical lattice. The lattice will act as a waveguide to prevent atom losses due to the high thermal velocity of Li, and as large momentum transfer beam splitters in analogy to the Bloch-Bragg-Bloch beam splitters already developed by us~[2,3]. We discuss investigations of novel all-optical cooling of lithium using degenerate Raman sideband cooling as well as recent progress towards a demonstration of the first ultracold lithium interferometer. \\[4pt] [1] H. M\"{u}ller et al., Phys. Rev. Lett. {\bf 100}, 180405 (2008) \\[0pt] [2] H. M\"{u}ller et al., Phys. Rev. Lett. {\bf 102}, 240403 (2009)