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Observation of dark-pulse formation in gain-clamped semiconductor optical amplifiers by cross-gain modulation

1999; American Institute of Physics; Volume: 75; Issue: 24 Linguagem: Inglês

10.1063/1.125447

1520-8842

P.E. Selbmann, T. Hessler, J.L. Pleumeekers, M.‐A. Dupertuis, B. Deveaud, B. Dagens, J.-Y. Emery,

Laser Design and Applications

We have measured the ultrafast simultaneous cross-gain and laser mode dynamics in a gain-clamped semiconductor amplifier perturbed by an intense detuned 150 fs pump pulse. Besides relaxation oscillations, we demonstrate the instantaneous formation of a dark pulse in the laser mode that repeats itself with a period given by the cavity round-trip time. The dark pulse sequence subsequently decays into two-mode beating and is shown to weakly cross modulate the amplifier gain. To describe dark-pulse formation a time- and spatially dependent model based on rate equations is necessary. The experimental results are in reasonable agreement with numerical simulations.