Polycrystalline IR-Fibers

Main features:

  • High transmittance in the range 3 – 18 μm
  • Low optical losses of about 0.2 – 0.3 dB/m in the range 9 – 13 µm
  • Core/Clad structure with core diameters span from 240 to 860 μm
  • Minimal aging effect
  • Non-hydroscopic and non-toxic

For more information see data and downloads available below.

Send Inquiry

art photonics developed a volume production technology of a unique product – Core / Clad Polycrystalline Infra-Red (PIR-) fibers transparent over a broad spectral range 3 – 18 μm.

Highest performance PIR core/clad fiber are extruded with core diameters span from 240µm to 860µm. Continuously improved extrusion process provides a superior optical quality and mechanical strength of PIR- fibers.

Low optical losses without absorption peaks over the mentioned spectral range ensure a successful use of PIR- fiber for a broad range of applications.

Parameters of standard Polycrystalline fibers

TypeStep Index MultimodeStep Index MultimodeStep Index MultimodeStep Index Multimode
Core Dia., µm240±10400±10600±10860±20
Cladding Dia., µm300+0/-10500+0/-15700+0/-151000+0/-20
Protective Jacket Dia., µmnononono
Min. bending  Radius, mm4575100150



Core/cladding compositionAgCl:AgBr
Spectral Range3 – 18 μm
Core Refractive Index2.15
Fresnel Reflection Losses25%
Attenuation at 10.6 µm0.2 – 0.4 dB/m
Effective Numerical Aperture NA0.35 +/- 0.05
Melting Point410 °C
Operating Temperature–273 to +140°C
Core/Clad Diameter (standard)see Parameters of standard Polycrystalline fibers
Laser Damage Threshold for CW CO2laser>12 kW/cm²
Tensile Strength> 70 MPa
Minimum Bending Radius (fixed)5 x [Fiber Diameter]
Minimum Elastic Bending Radius150 x [Fiber Diameter]


  • Mid IR spectroscopy
  • Flexible IR pyrometry
  • Flexible IR-Imaging systems
  • Power delivery for QuantumCascade Lasers
  • Power delivery for CO and CO2 Lasers