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 action for a given cavity design.
© 1994 Optical Society of America
Original Manuscript: June 28, 1994
Published: November 1, 1994
S. Gatz and J. Hermann, "Geometrical threshold zones and Gaussian modes in lasers with radially varying gain," Opt. Lett. 19, 1696-1698 (1994)