Nonlinearity of refractive index in glasses based on heavy metal oxides with different lead and tellurium contents |
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| Authors: | I A Denisov A G Selivanov K V Yumashev A V Anan’ev L V Maksimov N V Ovcharenko V N Bogdanov A A Lipovskii A N Vlasova |
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| Institution: | (1) National Research Institute for Optical Materials and Technologies, Belorussian National Technical University, 65 prosp. Nezavisimosti, Bldg. 17, Minsk, 220013, Belarus;(2) Scientific Research and Technology Institute for Optical Materials Science, St. Petersburg, Russia;(3) V. A. Fock Scientific Research Institute of Physics, St. Petersburg State University, Russia;(4) St. Petersburg State Polytechnical University, Russia |
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| Abstract: | We have studied the nonlinearity of the refractive index at a wavelength of 1.08 μm for optical lead silicate and lead phosphate
tellurite glasses of different compositions. We have shown that the nonlinear refractive index n2 increases as the lead content increases in lead silicate glasses and as the tellurium content increases in lead phosphate
tellurite glasses, where the latter are typically have higher values of n2, as high as 24·10−13 cgs units (47·10−16 cm2/W), and lower Rayleigh losses. We have established a correlation between the nonlinear refractive index and the microstructure
of the studied glasses. The highly nonlinear glasses are distinguished by extensive fluctuations in the heavy metal oxide
concentration which are “frozen” during cooling of the glass melt.
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Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 74, No. 6, pp. 780–784, November–December, 2007. |
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| Keywords: | nonlinear refractive index lead silicate glass lead phosphate tellurite glasses Rayleigh scattering “ frozen” density fluctuations Landau-Placzek ratio |
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