Intracenter population inversion as the reason for induced emission in highly deformed p-type Ge
Altukhov I. V., Kagan M. S., Korolev K. A., Sinis V. P.
Experimental results show that stimulated emission from /Муре Ge subjected to uniaxial compression results from an inversion of the filling of impurity levels. These levels form from the ground state of the acceptor, which is split by the deformation. One of the levels lies in a continuous band spectrum.