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art photonics development of specialty fibers for the Mid-Infrared region has resulted in a unique product – Chalcogenide Infra-Red (CIR-) fibers. Based on chalcogenide glasses (As2S3) they transmit IR-radiation in the spectral gap between Silica fibers (0.2-2.4µm) and Polycrystalline InfraRed (PIR) fibers (4-18µm) in the range of 1.5 – 6µm

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


  • High transmittance from 1.5µm to 6µm
  • Optical losses 0.2 dB/m at 2 – 4 µm
  • Double polymer coating for high flexibility
  • Standard fiber diameters from 8 to 500µm


  • Flexible IR-imaging systems
  • Remote non-contact pyrometry in the 200-600K range
  • Fiber probes for remote process IR – spectroscopy
  • Fiber amplifiers and lasers

Fiber Specification

Standard FibersCIR-8/200CIR-250/300CIR-350/400CIR-500/550
Core diameter, µ8250350500
Cladding diameter, µ200300400550
Protective Coating, µ300380510700
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 Radius-200 x Fiber diameter
Operating temperature, °C-200 < T < 100
Maximum transmitted Power, W1 (CW)

Application Notes: Chalcogenide IR-Fiber Cables

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