Chalcogenide IR-Fiber Cables

Chalcogenide Infra-Red (CIR-) fibers are based on chalcogenide glasses (As₂ S₃) and are able to transmit IR-radiation in the spectral gap between Silica fibers (0.2 – 2.4 μm) and Polycrystalline Infra-Red (PIR) fibers (4 – 18 μm) in the range of 1.5 – 6 μm.

Our single- and multimode CIR fibers are drawn in core/clad structure with a double polymer coating and characterized by a low optical loss.

● High transmittance from 1.5 μm to 6 μm

● Optical losses 0.2 dB/m at 2 – 4 μm

● Double polymer coating for high flexibility

● Standard fiber diameters from 8 to 500 µm

● Flexible IR-imaging systems

● Remote non-contact pyrometry in the 200 – 600 K range

● Fiber probes for remote process IR – spectroscopy

● Fiber amplifiers and lasers

Standard FibersCIR-8/200CIR-250/300CIR-350/400CIR-500/550
Core diameter, µm8250350500
Cladding diameter, µm200300400550
Protective coating, µm300380510700
Transmission Range1.5 – 6 μm
Core materialAs₂ S₃
Cladding materialAs-S
Primary protective tubingPTFE
Secondary protective tubingPVC
Core refractive index2.4
Effective NA0.25 – 0.28
Minimum bending radius200 x Fiber diameter
Operating temperature, °C-200 < T < 100
Maximum transmitted Power, W1 (CW)

Transmission spectra of 1.5 m long PIR-900/1000 fiber (red) versus 1,5 m long CIR-750/850 fiber (blue), includes Fresnel reflection & coupling losses at fiber ends and absorption bands of atmospheric moisture.

ParameterTypical value CIR-FiberTypical value PIR-Fiber
Transmission range1,5 to 6,0μm
or 1600 – 6500cm-1
3 – 18 µm
or 550 – 3300cm-1
Core/Cladding materialChalcogenide As-S glassesAgCl : AgBr
solid solution crystals
Specific FeaturesfToxic & Fragile Non-hygroscopicNon-toxic, Non-hygroscopic,
very flexible – up to plastic deformation, UV-sensitive
Core refractive index2.42.2
Effective NA0.280.25
Optical lossesMin. 0.2 dB/m @ 2 – 4 μmMin. 0.2-0.3 dB/m @ 10-12 μm
Minimum bending radius100 x Fiber diameter
Operating temperature, °C-200 < T < 100-270 < T < 150
Maximum transmitted Power, W150 (CW)