Threshold of a random laser with cold atoms.

摘要: We address the problem of achieving an optical random laser with a cloud cold atoms, in which gain and scattering are provided by same atoms. The lasing threshold can be defined using on-resonance thickness b0 as single critical parameter. predict quantitatively, well power frequency emitted light, two different light transport models atomic polarizability strongly pumped two-level atom. find on order 300, is within reach state-of-the-art cold-atom experiments. Interestingly, we that already occur regime relatively low scattering.