Chalcogenide IR-Fibers

Main features:

  • High transmittance in the range 1.1 – 6.5 μm
  • Low optical losses of about 0.2 – 0.3 dB/m at 2.5 – 4 µm and 4.5 – 5 µm
  • Core/Clad structure with core diameters span from 8 to 500 μm
  • Double polymer coating for high flexibility

For more information see data and downloads available below.

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Chalcogenide As-S glass fiber transmits IR-radiation in the spectral range of 1.1 – 6.5μm. High performance CIR core/clad fiber are drawn with core diameters span from 8µm to 500µm.

Advanced drawing process with double polymer jacket provides a superior mechanical strength and high flexibility of CIR- fibers.

Low optical losses and small absorption peaks over the mentioned spectral range ensure a successful use of CIR-fiber for a wide range of applications.


Parameters of standard Chalcogenide fibers
CodeCIR8/300CIR 50/250CIR 250/300CIR 340/400CIR 500/550
TypeStep Index Single-modeStep Index  Few-modeStep Index MultimodeStep Index MultimodeStep Index Multimode
Core Dia., µm8±150±3250±10340±10500±10
Cladding Dia., µm300±15250±10300±15400±15550±15
Protective Jacket Dia., µm400±20410 ± 20400 ±30510 ± 30700 ± 30
NA0.25 ± 0.020.13 ± 0.020.30 ± 0.030.30 ± 0.030.30 ± 0.03
Min. bending  Radius,mm60506080100


Core/cladding compositionAs2S3
Spectral Range1.1 – 6.5 μm
Core Refractive Index2.42
Fresnel Reflection Losses31%
Attenuation at 3 – 4 μm & 4.5 µm – 5 µm0.2 – 0.4 dB/m
Effective Numerical Aperture NAsee Parameters of standard Chalcogenide fibers
Glass Transition Temperature, Tg185 °C
Operating Temperature–273°C to +90°C
Core/Clad Diameter (standard)see Parameters of standard Chalcogenide fibers
Protective JacketFluoro polymer + PVC
Tensile Strength> 70 MPa
Minimum Bending Radius (fixed)100x [Fiber Diameter]
Minimum Elastic Bending Radius200x [Fiber Diameter]




  • Mid IR spectroscopy
  • Flexible IR pyrometry
  • Flexible IR-imaging Systems
  • Power delivery for Quantum Cascade Lasers


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