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Second and third harmonic generation in the opaque region of a GaAs wafer isexperimentally observed both in transmission and reflection. These harmoniccomponents can propagate through an opaque material as long as the pump istuned to a region of transparency or semi-transparency, and correspond to theinhomogeneous solutions of Maxwell's equations with nonlinear polarizationsources. We show that measurement of the angular and polarization dependence ofthe observed harmonic components allows one to infer the different nonlinearmechanisms that trigger these processes, including bulk nonlinearity, magneticLorentz and surface contributions. Experimental results are compared with adetailed numerical model that takes into account these different effects.

Second and Third harmonic generation in the opaque region of GaAs