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High power optical fiber with improved covering

  • US 4,678,273 A
  • Filed: 12/24/1984
  • Issued: 07/07/1987
  • Est. Priority Date: 12/23/1983
  • Status: Expired due to Term
First Claim
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1. In an optical fiber for transmitting high optical power having a central core portion adapted to conduct radiation, a cladding layer surrounding the core portion, and at least one covering surrounding the cladding layer and adapted to provide an improved mechanical stability to the fiber and to damp scattered radiation, the improvement for preventing the radiation level in any volume part of the covering from exceeding the limit at which the material of the covering is damaged comprising:

  • a radiation resistant transmitting material arranged outside of and in contact with the cladding at least at an entrance side over a portion of the length of the fiber and having a real refractive index greater than or close to the refractive index of the cladding; and

    at least one additional material layer outside of said radiation resistant transmitting material, at least the outermost layer comprising a heat-conducting means in which the radiation is absorbed.

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