Chalcogenide IR-Fibers

Chalcogenide IR-Fibers

Core / Clad Chalcogenide Infra-Red (CIR-) fibers are transparent iver a wide spectral range from 1 to 6 μm, therefore covering a spectral gap between silica and polycrystalline fibers. CIR fibers are used in a variety of applications, including spectroscopy and process monitoring tasks, IR radiation delivery to and out of closed volumes, thermosensing, laser power flexible delivery systems, IR-imaging, etc.

The fibers are provided in standart cable assemblies with 3 connector options, 3 sheathing options, and a line of customized fiber assemblies designed according customer’s request. We provide custom fiber solutions for non-standart tasks. Single-mode and small core fibers are available, along with a special glass compositions for a broader spectral range.



Key Features

● Fiber type – Step Index Multimode

● Standard fiber diameters from 0.3 to 0.55 mm

● 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


● 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


Common Parameters

Material CompositionAs2S3
Spectral Range1.1 – 6.5 μm
Core Refractive Index2.4
Fresnel Reflection Losses31%
Attenuation at at 3 – 4 µm0.2-0.4 dB/m
Effective Numerical Aperture NA0.30+/-0.05
Melting Pointnear 400°C
Operating Temperature-200 to +90°C
Core/Clad Diameter (standard)see table below
Protective JacketFluoro polymer + PVC
Tensile Strength> 700 MPa
Minimum Bending Radius (fixed)100[Fiber Diameter]
Minimum Elastic Bending Radius200[Fiber Diameter]


Chalcogenide Fiber Specification

CodeCIR 250/300CIR 340/400CIR 500/550CIR 8/300CIR 50/250
TypeStep Index MultimodeStep Index MultimodeStep Index MultimodeStep Index SinglemodeStep Index few modes
Core Diameter, µm250±10340±10500±158±150±3
Cladding Diameter, µm300±15400±15550±20300±15250±10
Polyvinylchloride Protective Jacket Diameter, µm400±20500±20670±20400±20350±20
Minimum Bending Radius (fixed), mm3040503025
Minimum Elastic Bending Radius, mm60801006050

⃰ other diameters are available on request