Abstract: We report the first experimental observation of a self-reflected wave inside a very dense saturable absorber.An intense femtosecond pulse saturates the absorptionand causes a density front moving into thesemiconductor sample. Due to the motion of the boundarybetween saturated and unsaturated areas of the samplethe light reflected at this boundary is red-shifted bythe Doppler effect. The spectrally shifted reflectionmakes it possible to distinguish between surfacereflection and self-reflection and is used to proof theconcept of the dynamic nonlinear skin effectexperimentally. Quite well agreement with modelcalculations is found. !16
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