Aluminum-coated step index multimode silica fibers (Low OH)

Hermetically sealed Aluminum-coated step index multimode optical fibers have all the benefits of silica-silica fibers. Additional significant improvements include increased mechanical strength and greater fatigue resistance compared to non-hermetic and polymer-clad fibers (PCS). Their transmittance covers a spectral range of 200 to 2400 nm, and also remains stable in corrosive chemicals that normally react to silica glass. The temperature range is from -196oC to +400oC. Hermetically metal-coated optical fibers are the optimum candidate when used in high vacuum and harsh environmental conditions

  Features:

  • Greatly enhanced resistance to high power laser radiation.
  • Higher core-to-clad ratio and enlarged NA optimised for coupling to high-energy lasers.
  • Better fiber cooling due to the heat-conducting metal coating.
  • Excellent mechanical strength and flexibility compared to polymer coated fibers.
  • Capability to feed the fibers into a high vacuum: the metal coating can be soldered and will not outgas.

 

 

 

 

 

 

 

                              

 

 

 

 

                                         Attenuation spectrum

 

Fiber Specifications:

Aluminum-coated step index multimode silica fibers -100/110AL -150/165AL -200/220AL -300/330AL
-400/440AL 
-600/636AL
-600/660AL
-800/848AL -800/880AL -1000/1060AL -1000/1100AL
Mode type MM MM MM MM MM MM MM MM MM MM MM
Index profile Step Step Step Step Step Step Step Step Step Step Step
Core diameter,  µm 100 ± 2  150 ± 3  200 ± 4  300 ± 6  400 ± 8  600 ± 12  600 ± 12  800 ± 15  800 ± 15  1000 ± 20 1000 ± 20
Clad diameter, µm
110 ± 3
165 ± 4
220 ± 5
330 ± 10
440 ± 12 636 ± 15 660 ± 15 848 ± 20 880 ± 20 1060 ± 40 1100 ± 40
Coating diameter,  µm 140 ± 8 (150 ± 8) 210 ± 12 300 ± 15 450 ± 25 565 ± 25 830 ± 30 860 ± 30 1060 ± 40 1110 ± 40 1350 ± 60 1410 ± 60
Cladding offset, % < 2
Coating offset, % < 5
Attenuation at 800/1300 nm (See grapf  SWU) the loss spectrum in the long wavelength region ( > 1um) is higher than that of the material  the loss spectrum is close to the material loss spectrum
Wavelength range, nm (See grapf SWU) 400 - 1100  400 - 1700  400 - 2200 
Material of hermetic protective coating (Coating material) Aluminium
Core material Pure syntetic silica (low OH)
Clad material Doped silica
Numerical Aperture (NA) 0.22 ± 0.02
Short-term bending radius 60 times the fiber diameters
Long-term bending radius 120 times the fiber diameters
Proof test, kpsi 100
Min operating temperature, C -196
Max operating temperature, C 400

 Aluminum-coated step index multimode silica fibers (Low OH)