Optical waveguides – Optical fiber waveguide with cladding
Patent
1994-05-06
1996-02-13
Bovernick, Rodney B.
Optical waveguides
Optical fiber waveguide with cladding
385142, 606 15, 606 16, G02B 602, G02B 616
Patent
active
054917670
ABSTRACT:
This invention relates to a family of rugged, non-toxic, high damage threshold, fiberizable, infrared transmitting germanate glasses that are suitable for medical laser delivery. They possess excellent visible transmission to utilize an aim beam in conjunction with the infrared laser. The glasses comprise (in mol %) 23.0-76.0% GeO.sub.2, 0-39.0% Ga.sub.2 O.sub.3, 3.0-51.0% SrO, 8.0-17.0% Ta.sub.2 O.sub.5, 0-23.0% Y.sub.2 O.sub.3, 0-35.0% ZnO, and optionally one or more of the following components; 0-11.0% TiO.sub.2, 0-20.0% Nb.sub.2 O.sub.5, 0-8.0% ZrO.sub.2, 0-13.0% Cs.sub.2 O, 0-10% MgO, 0-27% La.sub.2 O.sub.3, 0-25.0% Gd.sub.2 O.sub.3, 0-23.0% Yb.sub.2 O.sub.3. These glasses have intrinsic absorption coefficients of less than 0.137, 0.048, 0.024 and 0.021 dB/m at 2.94, 2.796, 2.71 and 2.69 .mu.m, respectively. The glasses are characterized by excellent chemical durability, low thermal expansion coefficient, high glass transition temperature, and good glass working properties such as low liquidus temperature, flat viscosity-temperature dependence and good resistance to devitrification. Specific embodiments are particularly well suited for use in biological applications where high chemical durability, non-toxicity, a high laser damage threshold and good infrared and visible transmission are required.
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McPherson Donald M.
Murray Steven C.
Bovernick Rodney B.
Caserza Steven F.
Wise Robert E.
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