Electron shelving induced lasing in cold bosonic atoms in optical   lattice
  We calculate the absorption spectrum of cold three level Helium atoms in lambda configuration in an optical lattice.Our results show the possibilty of lasing at certain points on the optical lattice which are capable of rendering one of the transitions metastable as compared to the other. A coherent control over the stimulated emission is possible using an axial magnetic field. 
Aranyabhuti Bhattacherjee