High power optical fiber with improved covering
First Claim
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.
2 Assignments
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Accused Products
Abstract
An optical fiber for transmitting high optical power and of the type having a central core portion adapted to conduct radiation, a cladding layer surrounding the core and at least one covering surrounding the cladding adapted to give an improved mechanical stability to the fiber and to damp scattered radiation wherein, in order to prevent the radiation level in any volume part of the covering from exceeding the limit at which the material of the covering is damaged, the fiber is, at least at its entrance side over a part of its length, provided with radiation resistant and radiation absorbing materials comprising a radiation resistant transmitting material with a real refractive index exceeding or close to that of the cladding, and one, or several, additional material layers of which the outermost are of heat-conducting materials, the radiation being absorbed in the outermost heat-conducting layer(s).
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Citations
8 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification