Source: http://aoot.osa.org/ome/abstract.cfm?uri=ome-4-5-1011
Timestamp: 2019-04-24 08:19:45+00:00

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We report measurements of the third order optical nonlinearity of 51 chalcogenide glasses in the near infrared. Substituting more polarizable elements (Se for S, Sb for As) into the glasses increased their nonlinearity but also reduced the optical bandgap increasing two-photon absorption. Overall the measured values are an extremely good fit to the semi-empirical Miller’s rule whilst the normalized real and imaginary parts are in satisfactory agreement with the scaling for indirect gap semiconductors reported by Dinu. At 1550nm we find that there is an upper limit to the nonlinearity of ≈10−13cm2/W above which two-photon absorption becomes significant.
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Fig. 1 Variation of optical damage threshold measured for CW radiation at 830nm for glasses in the Ge11.5As24(SexS1-x)64.5 for x = 0, 25%, 50%, 75% and 100%.
Fig. 2 (a) Variation of the nonlinear susceptibility vs (n02-1)4 demonstrating that the data is a good fit to Miller’s rule 2(b) The nonlinear index n2 plotted against the linear index n0 along with the Miller’s rule according to Eq. (2).
Fig. 3 Variation of the linear refractive index of Ge-Sb-Se glasses for fixed Sb contentions of 10, 15 and 20 as a function of Ge concentration. The stoichiometric compositions correspond to the minima in these graphs .
Fig. 4 (a) Typical open aperture traces and their corresponding fit to a numerical model. 4(b) Inverse transmission data for different wavelengths is plotted against irradiance. The slope of the lines is used to determine the 2PA absorption coefficient, β2.
Fig. 5 (a) Plot of n2 vs normalised photon energy for the glasses listed in Table 2. 5(b) β2 vs normalised photon energy for the glasses listed in Table 2.
Fig. 6 (a) Normalised nonlinear refractive index, n2Eg4n02, plotted as a function of normalised photon energy. 6(b) Normalised two photon absorption, β2Eg3n02, plotted as a function of normalised photon energy. The solid line is fitting according to Dinu’s model  and the dashed line is Sheik Bahae’s model .
Table 2 Compositions, optical bandgap (Eg), nonlinear optical properties (n2, β2 and FOM) of five selected chalcogenide glasses.
Compositions, optical bandgap (Eg), nonlinear optical properties (n2, β2 and FOM) of five selected chalcogenide glasses.

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