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Optical properties of transparent glass-ceramics in K2ONb2O5TeO2 glasses

1995; Elsevier BV; Volume: 189; Issue: 1-2 Linguagem: Inglês

10.1016/0022-3093(95)00227-8

1873-4812

Kazuhide Shioya, Takayuki Komatsu, Hyun Gyu Kim, Ryuji Sato, Kazumasa Matusita,

Photorefractive and Nonlinear Optics

Transparent glass-ceramics consisting of a cubic crystalline phase with crystallites having diameters between 20 and 40 nm in the composition of 15K2O15Nb2O570TeO2 (mol%) have been fabricated. A phase with cubic structure is formed by post-heat-treatment at around 390°C for 1 h and transforms into a stable phase at temperatures above 450°C. The glass-ceramics consisting of a stable crystalline phase are opaque. The transparency of glass-ceramics is attributed to a small particle size (average radius: 10–20 nm) of the cubic crystalline phase. The optical and dielectric properties for the transparent glass-ceramics obtained by heat-treatment at 425°C for 1 h are: refractive index, n = 2.11 ± 0.02; relative permittivity (1 kHz, 300 K), ϵr = 44 ± 1 and third-order non-linear optical susceptibility, χ(3) = 3.3 × 10−13esu. These values are larger than those for the original base glass, i.e. n = 2.02 ± 0.02, ϵr = 28 ± 1 and χ(3) = 0.9 × 10−13esu. Second-harmonic generation is clearly observed in transparent glass-ceramics. These transparent glass-ceramics have a potential as a new type of non-linear optical material.