Analysis of a dynamical procedure on diode-end-pumped solid-state lasers

For solid-state lasers, we have determined that the overlap integrals V-th, related to the threshold pump power, and V-slope related to the laser slop e efficiency, dynamically change with pump power. The increase of diffracti on loss is also caused by the dynamical change of the laser mode size, whic h alters the Fresnel number of the cavity. Subsequently, the threshold pump power and the laser slope efficiency also change dynamically. The dramatic increase of the laser mode radius at the laser crystal and the sudden decr ease of the laser mode radius at the output mirror when operating near the stability limit make the laser output suddenly drop. A longer cavity will h ave a larger threshold pump power and a smaller total output power.