Some aspects of lasing at vibronic transitions in impurity crystals are theoretically studied. The threshold conditions for a vibronic laser are shown to be dependent on the strength of interaction of optical centers with a local vibration, which forms the vibronic spectrum, and the crystal lattice temperature. The theory can be easily generalized to the spectrum containing a structureless phonon sideband and well agrees with the experimental temperature dependence of the output power of a Mg2SiO4:Cr4+ forsterite laser.
@article{arxiv.physics/0302090,
title = {On the Theory of Vibronic Laser},
author = {A. P. Saiko},
journal= {arXiv preprint arXiv:physics/0302090},
year = {2020}
}