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

Sanli Faez*, P. M. Johnson, D. A. Mazurenko, Ad Lagendijk

*Corresponding author for this work

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We have experimentally measured the distribution of the second-harmonic intensity that is generated inside a highly scattering slab of porous gallium phosphide. Two complementary techniques for determining the distribution are used. First, the spatial distribution of second-harmonic light intensity at the side of a cleaved slab has been recorded. Second, the total second-harmonic radiation at each side of the slab has been measured for several samples at various wavelengths. By combining these measurements with a diffusion model for second-harmonic generation that incorporates extrapolated boundary conditions, we present a consistent picture of the distribution of the second-harmonic intensity inside the slab. We find that the ratio l(2w)/L(c) of the mean free path at the second-harmonic frequency to the coherence length which was suggested by some earlier calculations, cannot describe the second-harmonic yield in our samples. For describing the total second-harmonic yield, our experiments show that the scattering parameter at the fundamental frequency k(1w)l(1w) is the most relevant parameter in our type of samples. (C) 2009 Optical Society of America

Original languageEnglish
Pages (from-to)235-243
Number of pages9
JournalJournal of the Optical Society of America B-Optical Physics
Issue number2
Publication statusPublished - Feb-2009


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