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Low expansion transparent glass-ceramics, glass-ceramic substrate and optical waveguide element
Low expansion transparent glass-ceramics, glass-ceramic substrate and optical waveguide element
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机译:低膨胀率透明玻璃陶瓷,玻璃陶瓷基板和光波导元件
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摘要
There are provided low expansion transparent glass-ceramics obtained by heat treating a base glass produced at a relatively low melting temperature of 1530°C or below. The glass-ceramics have an average linear thermal expansion coefficient within a range from +6 × 10-7/°C to +35 × 10-7/°C, 80% transmittance wavelength (T80) of 700nm or below. internal transmittance of 75% or over at light wavelength of 1550nm, heat resisting temperature of 800°C or over.and Young's modulus of 90 GPa or over. The glass-ceramics comprise SiO2, Al2O3, MgO, CaO, BaO, ZnO, Li2O, TiO2 and ZrO2 and contain β-quartz or β-quartz solid solution as a predominant crystal phase. There are also provided optical waveguide elements and an arrayed waveguide grating (AWG) type planar lightwave circuit utilizing these glass-ceramics.
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