| The properties of dark spatial solitons are investigated in a passive to active quantum-well semiconductor resonator. We find experimentally and confirm theoretically that the solitons show local light amplification. The amount of amplification as well as its parameter dependence changes with pump and with the character of the nonlinearity (absorptive, dispersive, mixed). By pumping, a reduction of soliton sustaining power (up to a factor of 300) is observed, and the influence of pumping on dynamics of solitons and the background on which they exist are investigated. When the pump is around laser threshold, we find the behaviour of solitons in line with the qualitative picture of "laser injection locking", as theoretically treated in [G. Tissoni et al., Proc. SPIE 5452, 335-343 (2004).] |
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