  We investigate a double quantum dot coupled to a transmission line resonator.
By driving a current through the double dot, a population inversion between the
dot levels can be created, and a lasing state of the radiation field is
generated within a sharp resonance window. The transport current correlates
with the lasing state. The sharp resonance condition allows for resolving small
differences in the dot properties. Dissipative processes in the quantum dots
and their effect on the lasing and transport behavior are investigated.
