We propose a new scheme for lasing without population inversion that u
tilizes interferences in double-quantum-well intersubband transitions.
In contrast to the previous inversionless laser schemes based on atom
ic systems, the new proposal permits us to use band-gap engineering to
choose the subband energies, coupling strengths, and decay rates, as
desired, and permits us to create a laser system that does not require
population inversion. We present detailed calculations on a specific
scheme and discuss possible extensions.