Cu-alloy Coated Silica Fibers

Cu-alloy Coated Silica Fibers

FPS Photonics copper-coated silica fibers are an optimal solution for tasks that take place under harsh conditions, such as high temperatures, vacuum, etc. as they stay stable in corrosive chemicals that would normally react to silica glass. The temperature range is from -270°C to 400°C with a humidity range of up to 100%.

The hermetically sealed fibers provide all the benefits of the silica-silica fibers, as well as providing increased mechanical strength and greater fatigue resistance then non-hermetic polymer-clad fibers. The transmission covers a spectral range of 200 to 2400 nm depending on the silica fiber core choice – UV or NIR.


Key Features

● Range of working temperatures up to 600°C

● Thin metal coating and NA optimized for coupling to high energy lasers

● Capable to be soldered into ferrules without glue

● Fiber cooling due to the heat-conducting metal coating

● Excellent mechanical strength and flexibility

● X-Ray resistant

● Sterilized using ETO, steam, e-beam or gamma radiation

● Capable to be used under high vacuum conditions without outgassing

● Possibility of soldering, embedded fibers, bundles, pigtails, inlets to high vacuum


● High temperature environments

● Harsh chemical environments

● Nuclear radiation resistant devices

● Down-hole sensing for oil and gas industry

● High power laser delivery

● Medical applications

● Soldered fiber bundles



Core/Cladding material Step IndexPure Fused Silica Core / Fluorine Doped Silica Cladding
Graded IndexGermanium Doped Fused Silica Core / Pure Fused Silica
Standard fiber core diameters, μm9; 50; 62.5; 200; 400; 600; 1000
Cu-alloy coating thickness, μm15 – 50
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+600
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