Self-focusing in a passive dielectric waveguide with a saturable nonlinearity is studied. The eigensolutions constitute a good approximation to the lateral modes of broad-area semiconductor lasers under low-duty-cycle pulsed conditions. The laser modes are predicted to consist of adjacent filaments coupled in phase, leading to a single-lobed far field, and to be stable with increased current injection above saturation intensity. The ultimate filament spacing is inversely proportional to the threshold gain, and thus wider filaments are expected in low-threshold broad-area lasers.
© 1987 Optical Society of America
Original Manuscript: July 6, 1987
Manuscript Accepted: August 4, 1987
Published: November 1, 1987
David Mehuys, Michael Mittelstein, Joseph Salzman, and Amnon Yariv, "Saturable nonlinear dielectric waveguide with applications to broad-area semiconductor lasers," Opt. Lett. 12, 953-955 (1987)