Geometrical threshold zones and Gaussian modes in lasers with radially varying gain.
The effect of a radially varying gain in tightly focused lasers is investigated with a generalized ABCD matrix formalism in a nonparabolic approximation. It is shown that the beam sizes can differ strongly from the theoretical with a constant gain or with radially varying gain in a parabolic approximation. Geometrical threshold zones are defined and studied and, instead of the stability zones, determine the possibility of a laser action for a given cavity design.
Gatz
S
S
Hermann
J
J