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ArmD® MIR optical fibers are high quality laser fibers for everything from medical treatments to FT-IR spectroscopy (4 – 16 µm).


  • Optimized for CO- and CO2-laser applications
  • Low attenuation in the mid-infrared (MIR) range
  • Robust and flexible
  • Non-hygroscopic material
  • Available in core/cladding or pure core versions

Wavelength / spectral range
ArmD® MIR: 4 – 18 μm
Numerical aperture (NA)
0,13 ± 0,02 | 0,25 ± 0,02 | 0,35 ± 0,02
Operating temperature
-60 to +110 °C
Standart diameter
Core / cladding (μm) 400 / 500 μm | 600 / 700 μm | 860 / 1000 μm
Calculation index (core)
Reflective losses @ 10.6 μm
25 %
Minimum bending radius
100 × cladding diameter
Highest power
30 Watt

The following diagrams provide an overview of attenuation values relative to the wavelengths:



First choice for applications including CO2- laser guides, FTIR spectroscopy, laser surface treatments and many more.

Instructions for using ArmD® MIR fibers

1. Handling Silver Halide Fibers:

Avoid touching the bare core/cladding; use dry, soft polymer, or paper.

Never touch the surfaces at the ends of the fibers to prevent laser damage.

Protect fibers from visible and UV radiation, including luminescent light.

2. Storage:

Maintain optical properties by storing in a dry, dark environment (e.g., loose, black polymer tube).

3. Protection During Storage:

Cover fiber tips with opaque caps to shield against contamination and UV/visible radiation.

Remove caps just before use, ideally in red light.

4. Preventing Deformation:

Ensure a minimum bending radius of 100 times the fiber diameter to prevent deformation. 

5. Connecting to Laser Beam:

Begin at low intensity and check spot size before increasing laser power.

Do not place the fiber too close to the irradiated area during intense radiation.

6. Preventing Overheating:

Use cooling measures when cables are employed for laser cutting or drilling.

Prevent fiber tips from melting (melting point: approx. 412 °C).

7. Smoothing Fiber Tip:

Use the sharpened edge of a knife, scalpel, or diamond knife (preferably from a dielectric material).

A microtome is recommended for optimum results; cut the thin part of the fiber slowly after the first cut.

Other products

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ArmD® Multi-Core Optical Fiber

ArmD® Multi-Core Fiber Optics unlock a spectrum of capabilities for laser power delivery, providing precise control over power density and beam shape through the utilization of different cores or multiple cores simultaneously. Armadillo offers customizable multi-core optical fibers tailored to meet your specific needs.

ArmD® Fiber Taper Products

ArmD® fused tapered fibers are designed for deployment across the entire spectrum, spanning from deep UV to NIR wavelengths. Essential for accommodating variations in input and output diameters, these taper products offer a diverse array of options tailored for specific applications, ensuring flexibility to meet specialized requirements.

ArmD® Metal-Coated Silica Fibers

ArmD® silica fibers, coated with metals like Tin, Copper, Aluminum, and Carbon-primed Aluminum, boast exceptional heat resistance, outperforming other fiber types in high-temperature environments. Ideal for demanding settings, these metal-coated fibers ensure reliability and durability.

ArmD® Capillary CT, CTH

Our innovative ArmD® flexible silica capillary tubing offers the highest temperature capability in the industry at 400° C (ArmD® CTH).

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