Multiple species atom source for laser-cooling experiments
  We describe the design of a single beam, multiple species atom source in which the flux of any component can be separately adjusted. Using this design we have developed a 23Na-6Li atom source for ultracold atom experiments. The fluxes of lithium and sodium are independently tunable, allowing operation as a single 23Na or 6Li source as well as a double source with equal atomic fluxes in each component. 
C. A. Stan, W. Ketterle