OPERATION CONDITIONS AND STABILITY OF A DEGENERATE 2-PHOTON LASER

The presence of a far off-resonant intermediate level in a degenerate three-level two-photon laser model manifests through a steady pump-dep endent and a dynamic frequency shift on the laser equations. The stead y shift strongly affects the pump threshold necessary for emission, pr eventing it in certain cases. The dynamic shift makes the frequency pu lling/pushing to be intensity-dependent and substantially modify the d omains of existence and stability of the lasing solution permitting st able operation for large cavity losses in certain cases.