Chalcogenide IR-Fibers

Main features:

  • Fiber type – Step Index Multimode
  • Standard fiber diameters from 300 to 550 μm
  • Standard fiber transmittance in 1.1 – 6.5 µm spectral range
  • Typical optical losses 0.2 dB/m at 3 – 4 µm
  • Double polymer coating for high flexibility
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Chalcogenide As-S glass fiber transmits IR- radiation in the spectral range of 1.1 – 6.5μm.

High performance Chalcogenide Infra-Red (CIR) core/clad fibers 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- fibers for a broad range of applications.

CIR fiber is used for a wide range of products for spectroscopy and process monitoring tasks, IR radiation delivery to and out of closed volumes, thermosensing, laser power flexible delivery systems, IR-imaging, etc.

For more information please visit our “Downloads” section and find relative articles at our “Publications” page.


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±15
Cladding Dia., µm300±10250±10300±15400±15550±20
Protective Jacket Dia., µm400±20410 ± 30400 ± 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 & 4.5µm – 5µm0.2 – 0.4 dB/m
Effective Numerical Aperture NA0.30 +/- 0.05
Glass Transition Temperature, Tg185 °C
Operating Temperature–273 to +90°C
Core/Clad Diameter (standard)See table above
Protective JacketFluoro polymer + PVC
Tensile Strength> 70 MPa
Minimum Bending Radius (fixed)100 [Fiber Diameter]
Minimum Elastic Bending Radius200 [Fiber Diameter]




  • Spectroscopy Fiber Probes for Mid-IR spectra
  • Remote non-contact pyrometry in the 200-600K range
  • Flexible Radiometry
  • Flexible IR-imaging Systems
  • Power delivery for QC – Lasers