Posted in | Optical Fiber

Aluminum Coated Silica Fibers

The Aluminum Coated Silica Fibers are the optimal solution when used in high temperature, vacuum and harsh environmental conditions. Hermetically sealed fibers have all the benefits of silica-silica fibers. Additional significant improvements include increased mechanical strength and greater fatigue resistance compared to non-hermetic polymer-clad fibers. The transmission covers a spectral range of 220 to 2400 nm depending upon a UV or NIR silica fiber core choice. Al-coated fibers remain stable in corrosive chemicals that normally react to silica glass. The temperature range is from -270°C to 400°C with a humidity range of up to 100%.


Specification of Cu-alloy coated Fibers
Coating material Al
Core/ Cladding material Step Index Pure Fused Silica Core / Fluorine Doped Silica Cladding
Graded Index Germanium Doped Fused Silica Core / Pure Fused Silica
Standard fiber core diameters, μm 9; 50; 62.5; 200; 400; 600;
Al coating thickness, μm 15 – 150
Standard Numerical Aperture (NA) 0.22 ± 0.02
Available Numerical Aperture (NA) 0.12 ± 0.02
0.26 ± 0.02
Min operating temperature, °C -270
Max operating temperature, °C +400
Humidity Range Up to 100%
Minimal bending radius (long term) 200 x fiber outer diameter
Minimal bending radius (short term) 100 x fiber outer diameter
Tensile strength (short gauge), GPa 3.5 – 6
Two point bending strength, GPa >10
Static fatigue parameter >100



  • Soldered fiber bundles
  • High-temperature surroundings
  • Medical applications
  • Harsh chemical environments
  • Nuclear radiation resistant devices
  • High power laser delivery
  • Down-hole sensing for oil and gas sector

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