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Opt Express. 2010 May 10;18(10):10143-53. doi: 10.1364/OE.18.010143.

Experimental verification of soliton-like pulse-shaping mechanisms in passively mode-locked VECSELs.

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Department of Physics, Institute of Quantum Electronics, ETH Zurich, 8093 Zurich, Switzerland.


We present a detailed experimental study on the influence of dispersion on the pulse formation in passively modelocked vertical-external-cavity surface-emitting lasers (VECSELs). We have demonstrated that the shortest pulse duration requires slightly positive dispersion to balance the nonlinear phase shift induced by strong semiconductor gain and absorber saturation. This is in contrast to soliton modelocking in ion-doped solid-state lasers - but similarities remain and will be discussed. Our results are in good qualitative agreement with numerical simulations and confirm the quasi-soliton modelocking mechanism of ultrafast VECSELs.

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