Main features:


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 Index | Pure Fused Silica Core / Fluorine Doped Silica Cladding |
| Graded Index | Germanium Doped Fused Silica Core / Pure Fused Silica |
| Fiber core diameters, μm | Single mode: 2.5 – 9; Multimode: 50; 62.5; 100; 200; 400; 600; 800; 1000 |
| Al coating thickness, μm | 15 – 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, °C | 450 |
| 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 |
| Parameters of standard Al-coated fibers | |||||
|---|---|---|---|---|---|
| Code | Type | Core, μm | Cladding, μm | Coating AI, μm | NA |
| 100/110 Al | Step Index Multimode | 100 ± 2 | 110 ± 2.2 | 140 ± 7 | 0.22 |
| 200/220 Al | Step Index Multimode | 200 ± 4 | 220 ± 4.4 | 300 ± 15 | 0.22 |
| 400/440 Al | Step Index Multimode | 400 ± 8 | 440 ± 8.8 | 560 ± 28 | 0.22 |
| 600/660 Al | Step Index Multimode | 600 ± 12 | 660 ± 13.2 | 825 ± 41.25 | 0.22 |
| 50/125 Al | Graded Index Multimode | 50 ± 1 | 125 ± 2.5 | 165 ± 3.3 | 0.22 |
| SM-Al | Step 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