The trapping and dynamic nonequilibrium spatiospectral mixing of two nonresonant
picosecond pulses injected into the active area of a broad-area semiconductor laser
are investigated on the basis of spatiotemporal numerical simulations. The
spatiotemporal dynamics of the nonequilibrium Wigner distributions of the charge
carriers and the interband polarization reveal the spatiospectral wave mixing and
spatiospectral nature of self-focusing, propagation-induced hole burning, dynamic
nonlinear waveguiding, and interference effects. This interplay of effects is
identified as the origin of the pulse merging and of the subsequent formation of a
trapped pulse that is reminiscent of a spatial optical soliton.
© 1998 Optical Society of America
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