We report on coherent backscattering measurements from amplifying rand
om media using optically pumped Ti:sapphire powders. The top of the ba
ckscattering cone sharpens with increasing gain, reflecting a change i
n the relative contributions to the intensity from paths of different
lengths. A calculation based on diffusion theory is performed on coher
ent backscattering from amplifying random media, which is in good agre
ement with the data.