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Mid-IR Fiber Optics Optical Assemblies Resources OptoKnowledge Main Site

Mid-Infrared (Mid-IR) Fiber Optic Solutions

Standard Products

Fiber Coating / ID

Connectors / Mounts

Build Your Own

Fibers for High Energy Laser Beams Hollow Core Fiber

Mid-IR Hollow Fibers

Hollow core fiber optics (i.e., waveguides) are the ideal solution for many Mid-IR applications requiring remote laser beam delivery. Benefits include the following:

  • Good transmission from: λ = 2 – 16 µm
  • Single mode options for λ ≥ 5 µm
  • Mode filtering of non-Gaussian beams
  • High coupling efficiency (> 95%)
  • High energy/power (up to 100 W CW)
  • No end reflections
  • No cladding modes
  • Robust and Flexible

Internal Dielectric Coating

The relative spectral transmission of hollow fibers depends on the thickness of the dielectric layer deposited inside the hollow fiber. This thickness is a parameter that we have full control over and can be tuned for a specific wavelength range with thicker coatings giving better transmission for longer wavelengths. We offer 4 standard coating options covering the entire Mid-IR. Alternative structures are available for other wavelength regions including UV, Visible/NIR, and THz.

Fiber Specs Chart
Mid-IR Fiber Specs Chart
Mid-IR Fiber Specs Chart

Fiber Internal Diameter (ID)

Overall transmission in hollow fibers depends strongly on the fiber internal diameter (ID). Theoretically, loss can be described by Hybrid HE lm modes. The attenuation coefficients of such modes depend on the internal diameter as 1/(ID)3. In addition, there is a strong dependence on the mode#. Larger ID fibers have lower loss, but support more modes (i.e., multi-mode). Smaller ID fibers have higher loss, but heavily damp out the higher order modes, and can thus deliver single mode output. Furthermore, such single-mode fibers are very effective at filtering out higher order mode, and “cleaning” up non-ideal beams. OptoKnowledge is also in the process of developing tapered hollow fibers, in which the diameter gradually changes along the length of the fiber.

Theoretical Loss
Fiber Specs Chart

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