Abstract:
A clad optical fiber having an air space between its core and cladding. The air space allows outgasing of the fiber core and cladding material during fabrication of the fiber and forms an internally reflective interface with the core for transmitting light through the fiber by total internal reflection.
Abstract:
Manufacturing miniature plural element wavelength multiplexing prisms by preparing an accurately proportioned greatly oversized preform of each element of the respective prisms and assembling the preforms in side-by-side relationship as a boule, heating and drawing the boule longitudinally into an elongated component of greatly reduced cross-sectional size and cutting the drawn component transversely into a plurality of short sections each of a length equal to that desired of the prism resulting from such cutting.
Abstract:
A PROCESS FOR ESSENTIALLY COMPLETELY ELIMINATING ACID SOUBLE CLADDING FROM AN OPTICAL FIBER BUNDLE. AN ACID SOLUBLE CLAD COHERENT OPTICAL FIBER BUNDLE IS COATED WITH AN ACID RESISTANT COATING EXCEPT FOR AN AREA ADJACENT EACH END, AND THE RESULTING EXPOSED AREAS ARE ACID LEACHED TO REMOVE ALL THE ACID SOLUBLE GLASS THEREFROM, LEAVING A FLEXIBLE AREA ADJACENT EACH END. THE FIBERS IN THESE AREAS ARE FUSED TOGETHER HOLDING THE FIBERS IN COHERENCY. THE ENDS OF THE BUNDLE ARE REMOVED FROM ABOUT THE MIDDLE OF THE FUSED SECTIONS, AND THE ACID RESISTANT COATING REMOVED. THE ACID LEACHABLE CLADDING IS THEN LEACHED FROM THE REMAINDER OF THE BUNDLE, LEAVING A FLEXIBLE, IMAGE TRANSPORTING BUNDLE HAVING FUSED COHERENT OPPOSITE ENDS.
Abstract:
A plurality of optical fibers each having a core of high refractive index light-transmitting material, a cladding of lower refractive index material and a number of longitudinal acidsoluble rods fused to the exterior of the cladding are formed into a bundle with the rods spacing the fibers apart and leaving voids between them. The bundle is elongated by drawing and the drawn bundle having voids between its fibers is potted at each end with an acid resistant material whereupon it is leached to remove lengths of the rods between the end coatings for producing a flexible image-transmitting conduit.
Abstract:
A flexible fiber optic conduit formed of a multiplicity of juxtaposed light-conducting fibers all connected together adjacent opposite ends of the conduit by a matrix of silica-free acid soluble glass with said connecting glass having been leached from the intermediate portion of the bundle leaving corresponding lengths of individual fibers thereof unconnected and free to flex individually. Short lengths of semiflexible heat-shrunken plastic tubing tightly surround transitional zones between unconnected and connected together portions of the individual fibers adjacent opposite ends of the conduit. These lengths of tubing strengthen and protect the aforesaid transitional zones against undue breakage during use of the conduit as a light and/or image transmitting device.
Abstract:
A method of making a length of drawn multifiber conduit of improved optical quality including the steps of heating a section of juxtapositioned optical fibers to a temperature suitable for rapid drawing to reduced cross-sectional size, the volume of materials of said section being sufficient to yield the entire drawn conduit, keeping interstices between the juxtapositioned fibers open adjacent opposite ends of the section for outgasing during the heating step and drawing the heated section rapidly to the cross-sectional size and length desired of the conduit so as to quickly expose the resulting conduit to a chilling atmosphere for immediate quenching and avoidance of internal gas bubble formation.
Abstract:
An illuminating halo for use in conjunction with an imagetransporting fiber optic bundle. The halo is formed of a multiplicity of light-conducting fibers each having a leachable outer cladding. The fibers are juxtapositioned circumferentially about the outer side of a supporting tube and the resulting assembly is heated and drawn to the diametral size desired of the halo. The fibers are then leached free of the tube over all but one end thereof which is cut or broken away to remain as a bushing for the halo.
Abstract:
ILLUMINATED IMAGE TRANSPORTING FIBER OPTICS ARE FABRICATED BY FIRST FORMING A COHERENT BUNDLE OF OPTICAL FIBERS, THE ENDS OF THE BUNDLE BEING ARRANGED IN IDENTICAL GEOMETRICAL PATTERNS AND BOUND TOGETHER WITH AN ACID LEACHABLE SILICA-FREE GLASS. A THICKNESS OF FIBERS IS REMOVED FROM ONE END OF THE COHERENT BUNDLE WHEREUPON REMAINING FIBERS AT THAT END AND THE ENTIRE OPPOSITE END OF THE BUNDLE ARE SEALED WITH AN ACID RESISTANT COVER. THE INTERMEDIATE UNCOVERED PARTS OF THE BUNDLE ARE LEACHED TO SIMULTANEOUSLY FREE CORRESPONDING INTERMEDIATE LENGTHS OF THE FIBERS AND ENDS OF THE FIBERS OF SAID PARTIALLY REMOVED THICKNESS THEREOF. THE RESULTING FREE ENDS OF THE PARTIALLY REMOVED THICKNESS OF FIBERS ARE GATHERED INTO A BUNDLE WHEREBY LIGHT APPLIED THERETO PROVIDES ILLUMINATION AT THE OPPOSITE END OF THE COHERENT BUNDLE.