New Product: Square Core Fiber

Square Core RenderingSquare core fibers excel in specific applications where traditional circular core fibers with Gaussian outputs are not ideal. The uniform “top hat” intensity profile these fibers provide are the desired output profile when performing tasks such as welding, photolithography, and spectroscopy. Square core fibers with round claddings are also excellent candidates for use in the laser diode industry, where the square shape enables a more ideal coupling match with the diode source. Fiberguide offers pure silica square core fibers with a fluorine doped cladding (0.22 NA) in a wide range of core diameters from 100 μm to 1000 μm.


  • Laser materials processing
  • Astronomical spectroscopy
  • Non-circular diode beam coupling
  • Photolithography

Square Core Beam ProfileSquare Core Round CladFeatures

  • Homogenized output distribution
  • Top hat beam profile
  • Greater capture area than round fibers for square inputs
  • Broad application wavelengths :
    • 190nm to 1250nm (High OH)
    • 300nm to 2400nm (Low OH)
  • Various jacketing options
    • Acrylate
    • Nylon
    • Polyimide

Square Core Fibers Spec Sheet (PDF)

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