Low expansion transparent glass-ceramics, glass-ceramic substrate and optical waveguide element
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United States of America Patent
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Dec 12, 2006
Grant Date -
Feb 21, 2002
app pub date -
Apr 24, 2001
filing date -
Jul 7, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
There are provided low expansion transparent glass-ceramics obtained by heat treating a base glass produced at a relatively low melting temperature of 1530.degree. C. or below. The glass-ceramics have an average linear thermal expansion coefficient within a range from +6.times.10.sup.-7/.degree. C. to +35.times.10.sup.-7/.degree. C., 80% transmittance wavelength (T.sub.80) of 700 nm or below, internal transmittance of 75% or over at light wavelength of 1550 nm, heat resisting temperature of 800.degree. C. or over and Young's modulus of 90 GPa or over. The glass-ceramics comprise SiO.sub.2, Al.sub.2O.sub.3, MgO, CaO, BaO, ZnO, Li.sub.2O, TiO.sub.2 and ZrO.sub.2 and contain .beta.-quartz or .beta.-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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