Frost-resistant fiber waveguides with a quartz glass core and a silicone rubber cladding
1980
An investigation was made of the numerical aperture and excess losses in fiber waveguides with a silicone reflecting cladding at temperatures from –100°C to +20°C. A rapid rise of the optical losses was due to an increase in the refractive index of the silicone cladding because of its crystallization. The use of silicone rubber with a lower crystallization temperature made it possible to extend the working temperature range. Even better results were achieved at low temperatures by the use of waveguides with a core doped with GeO2.
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