Physics – Optics
Scientific paper
2009-02-06
J. Opt. Soc. Am. B, vol. 26 no. 2, pp. 235-243 (2009)
Physics
Optics
10 pages, 7 figures
Scientific paper
10.1364/JOSAB.26.000235
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 $\ell_{2\omega}/L_c$ 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 $\k_{1\omega}\ell_{1\omega}$ is the most relevant parameter in our type of samples.
Faez Sanli
Johnson Matthew P.
Lagendijk A.
Mazurenko Dmitry A.
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