Aluminum Coated Silica Fibers

Main features:

  • Operating up to 450°C
  • Impressive mechanical strength and flexibility
  • No outgassing in high vacuum environments
  • Solderable for connector integration (epoxy-free choice)
  • Efficient heat dissipation with metal coating
  • Compatible with sterilization methods: Steaming, ETO, steam, e-beam, or gamma.

Mir Photonics’ Aluminum Coated Silica Fibers stand as the premier choice for applications that demand exceptional reliability under high temperatures, high vacuum, and other extreme environmental conditions. Designed for use where conventional polymer-coated fibers fail, these fibers deliver stable optical performance even in harsh industrial, scientific, and aerospace environments. Their aluminum coating enables efficient thermal management while ensuring long-term durability in applications exposed to heat, radiation, or aggressive sterilization processes.

These aluminum-coated fibers retain all the inherent benefits of standard silica-silica fibers, including excellent optical clarity, low attenuation, and chemical inertness. At the same time, the metallic coating significantly enhances mechanical strength and fatigue resistance, offering superior protection against micro-bending, vibration, and repeated mechanical stress. Compared to polymer-coated alternatives, aluminum-coated fibers exhibit far greater longevity and structural stability, making them ideal for demanding installations where maintenance or replacement is difficult or costly.

With a broad optical transmission range from 220 to 2400 nm, these fibers support a wide variety of applications, depending on whether UV or NIR silica fiber cores are selected. This versatility makes them suitable for spectroscopy, sensing, medical, and industrial laser systems. Remarkably, they maintain consistent performance across an extreme temperature range from cryogenic conditions as low as –270°C up to continuous operation at 450°C. In addition, they tolerate humidity levels up to 100%, ensuring reliable operation in both vacuum environments and moisture-rich settings without degradation of optical or mechanical properties.

Specification of standard Al-coated fibers
Core/ Cladding material Step IndexPure Fused Silica Core / Fluorine Doped Silica Cladding
Graded IndexGermanium Doped Fused Silica Core / Pure Fused Silica
Fiber core diameters, μmSingle mode: 2.5 – 9; Multimode: 50; 62.5; 100; 200; 400; 600; 800; 1000
Al coating thickness, μm15 – 150 (depending on fiber diameter)
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, °C450
Humidity RangeUp 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), GPa3.5 – 6
Two point bending strength, GPa>10
Static fatigue parameter>100
Parameters of standard Al-coated fibers
CodeTypeCore, μmCladding, μmCoating AI, μmNA
100/110 AlStep Index Multimode100 ± 2110 ± 2.2140 ± 70.22
200/220 AlStep Index Multimode200 ± 4220 ± 4.4300 ± 150.22
400/440 AlStep Index Multimode400 ± 8440 ± 8.8560 ± 280.22
600/660 AlStep Index Multimode600 ± 12660 ± 13.2825 ± 41.250.22
50/125 AlGraded Index Multimode50 ± 1125 ± 2.5165 ± 3.30.22
SM-AlStep Index Single Mode, wavelength cut-off from 320nm up to 1300nm

High temperature environment

Harsh Chemical environment

Nuclear radiation resistant devices

Down-hole sensing for oil and gas industry

High Power Laser delivery

Medical applications