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New Product: RARe Motheye Fiber

Alternative to AR Coating for Optical Fibers

Superior Anti-Reflection (AR) Technology

When compared to AR coating for optical fibers, Fiberguide’s patented RARe Motheye technology enhances fiber transmission performance and significantly increases the damage threshold for your application over a large wavelength range.

  Spec Sheet    

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Laser Induced Damage Threshold Chart Fiberguide’s patented RARe Motheye Fiber is based on a unique, randomized process that creates nanostructures on the fiber surface; this results in fiber optic cables that can transmit more light because of enhanced anti-reflective properties. Through this rigorous process, fiber optic cables are produced that have superior wavelength range, durability, and damage thresholds when compared with commonly used AR coating for fiber optics.

RARe Motheye nanostructures are about 200nm in height and width. Because this is less than the wavelength of light, 400-2200nm, the structure is not visible under a microscope. The fiber may appear darker under certain microscopes because light is not reflecting off the surface.

RARe Motheye has a high Laser Induced Damage Threshold (LIDT) when compared to standard AR coating for fiber optics because the structure is made from the base material of fused silica (see bar graph to the right). Traditional AR thin film coatings are made from alternating dielectric and metal layers and cannot take high LIDT.

This increased LIDT translates to increased lifetime durability for your application.

  • High % Transmission
  • Ultra Low % Reflectivity
  • Large Wavelength Range
  • High Damage Threshold


  • Life Sciences: Flow Cytometry, Gene Sequencing, Confocal Microscopy, Laser-based Microscopy, Spectroscopy, Medical Lasers
  • Industrial: Laser Cutting, Laser Cladding, Laser Welding, Laser Marking, Laser Engraving

  • Anti-Reflection Type: Randomized Nanosurface
  • Wavelength Range: 400nm-1550nm
  • Fiber Sizes: 3um up to 2mm core
  • Reflectivity: 0.5% from 460nm to 1550nm across 1090nm (Lower reflectivity at specific wavelengths available upon request)
  • Angle of Incidence: 0-60 degrees
  • Laser Damage Threshold: 59J/cm2, Tested at 1064nm, 16.4ns, 20Hz, Spot Dia. 0.405mm
Please see the Spec Sheet for further information.

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