Cross-relaxation emptying of the ground state of rare-earth ions in crystals
Noginov M. A., Prokhorov A. M. , Sarkisyan G. K., Smirnov V. A. , Shcherbakov I. A.
The ground state of the ions of rare-earth elements can be effectively emptied during pumping from an excited state of these ions. A necessary condition for the realization of this method is a cross-relaxation "breeding" of excitations in a system of interacting particles.