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.

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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.

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

Parameters of standard Polycrystalline fibers

Code PIR240/300 PIR400/500 PIR600/700 PIR900/1000
Type Step Index Multimode Step Index Multimode Step Index Multimode Step Index Multimode
Core Dia., µm 240±10 400±10 600±10 860±20
Cladding Dia., µm 300+0/-10 500+0/-15 700+0/-15 1000+0/-20
Protective Jacket Dia., µm no no no no
NA 0.35±0.05 0.35±0.05 0.35±0.05 0.35±0.05
Min. bending  Radius, mm 45 75 100 150



Core/cladding composition AgCl:AgBr
Spectral Range 3 – 18 μm
Core Refractive Index 2.15
Fresnel Reflection Losses 25%
Attenuation at 10.6 µm 0.2 – 0.4 dB/m
Effective Numerical Aperture NA 0.35 +/- 0.05
Melting Point 410 °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 Radius 150 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