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We have experimentally measured the distribution of the second-harmonicintensity that is generated inside a highly-scattering slab of porous galliumphosphide. Two complementary techniques for determining the distribution areused. First, the spatial distribution of second-harmonic light intensity at theside of a cleaved slab has been recorded. Second, the total second-harmonicradiation at each side of the slab has been measured for several samples atvarious wavelengths. By combining these measurements with a diffusion model forsecond-harmonic generation that incorporates extrapolated boundary conditions,we present a consistent picture of the distribution of the second-harmonicintensity inside the slab. We find that the ratio $\ell_{2\omega}/L_c$ of themean free path at the second-harmonic frequency to the coherence length, whichwas suggested by some earlier calculations, cannot describe the second-harmonicyield in our samples. For describing the total second-harmonic yield, ourexperiments show that the scattering parameter at the fundamental frequency$\k_{1\omega}\ell_{1\omega}$ is the most relevant parameter in our type ofsamples.

Experimental observation of second-harmonic generation and diffusion inside random media