The present disclosure provides a method for knotting glass fibers and a spliced glass fiber bundle. The method for knotting glass fibers comprises the following steps of: equally dividing a glass fiber bundle A and a glass fiber bundle B that are to be connected by knotting into n strands, respectively, and marking the strands as A1-An and B1-Bn, respectively, wherein n is a natural number greater than or equal to 2; and, successively knotting and splicing the glass fiber strands A1-An and the glass fiber strands B1-Bn in one-to-one correspondence to form n spliced knots. The method for knotting glass fibers in the present disclosure is simple, easy to operate and applied to the knotting and splicing of various fiber bundles, and can effectively reduce the size of knots formed by knotting fiber bundles. Accordingly, the blockage, entanglement, stoppage and other phenomena during the production can be prevented, the smooth production is ensured, and it is advantageous for continuous production and quality of subsequent products.

A converter plate includes an array of optical fibers arranged axially parallel to each other. The optical fibers have optical properties selected to convert light from a light-emitting diode entering the optical fibers from one end of the array of optical fibers to light of a different wavelength exiting the fibers from another end of the array of optical fibers. The optical properties of some of the optical fibers differ from the optical properties of others of the optical fibers such that the light exiting the some of the optical fibers has a wavelength different from that of the light exiting the others of the optical fibers. The converter plate is manufactured by providing the optical fibers and combining the optical fibers into a bundle, the optical fibers being arranged axially parallel to each other. The bundle of optical fibers is drawn to attenuate the bundle of fibers into a secondary fiber having a reduced cross section. The secondary fiber is wafered into a converter plate that includes an array of the optical fibers arranged axially parallel to each other.

A method of forming an imaging fibre apparatus comprises arranging rods to form a plurality of stacks each comprising a respective plurality of rods, wherein: for each stack, the respective plurality of rods comprises rods having different core sizes, the rods of different core sizes being arranged in a selected arrangement, and the rods of different core sizes being arranged such that each stack has a respective selected shape; wherein the selected shape or shapes are such that the stacks stack together in a desired arrangement; the method further comprising: drawing each of the plurality of stacks; stacking together the plurality of drawn stacks together in the desired arrangement to form a further stack;drawing the further stack; and using the drawn further stack to form an imaging fibre apparatus, wherein the selected arrangement of the rods in each stack and the selected shape or shapes of the stacks are such that the further stack comprises a repeating pattern of rods of different core sizes.

Provided is an image guide fiber that improves image quality while preventing a manufacturing problem. The image guide fiber according to the present disclosure has a numerical aperture NA in the range of 0.70 to 0.90. A linear thermal expansion coefficient difference , which is a value obtained by subtracting a linear thermal expansion coefficient .sub.2 at from 100 to 300 C. of clad glass, from a linear thermal expansion coefficient .sub.1 at from 100 to 300 C. of core glass, is in the range of 310.sup.7 C. to 1510.sup.7/ C. A glass-transition temperature Tg.sub.1 of the core glass is higher than a glass-transition temperature Tg.sub.2 of the clad glass. A core occupancy area ratio is 25% or more. A pixel density is 0.1 pixel/m.sup.2 or more.

The present invention discloses a fabrication method and use of a ?40 mm large-size and high-contrast fiber optic image inverter, belonging to the field of manufacturing of fiber optic imaging elements. The light-absorbing glass for preparing the ?40 mm large-size and high-contrast fiber optic image inverter consists of the following components in molar percentage: SiO.sub.2 60-69.9, Al.sub.2O.sub.3 1.0-10.0, B.sub.2O.sub.3 10.1-15.0, Na.sub.2O 1.0-8.0, K.sub.2O 3.0-10.0, MgO 0.1-1.0, CaO 0.5-5.0, ZnO 0-0.1, TiO.sub.2 0-0.1, ZrO.sub.2 0.1-1.0, Fe.sub.2O.sub.3 3.0-6.5, Co.sub.2O.sub.3 0.1-0.5, V.sub.2O.sub.5 0.51-1.5 and MoO.sub.3 0.1-1.0. The fiber optic image inverter has the advantages of low crosstalk of stray light, high resolution and high contrast.

A method of forming an imaging fibre apparatus comprises: arranging core rods 102 and cladding rods 104 to form at least one primary stack 100a, each primary stack 100a comprising a plurality of core rods 102 and cladding rods 104 arranged in a stack arrangement thereby to form a plurality of core regions within a cladding region; performing a drawing process to form a plurality of drawn stacks from the at least one primary stack; wherein the plurality of core rods and cladding rods are further arranged to have a selected shape such that the plurality of stacks stack together in a desired arrangement and wherein the stack arrangement comprises an at least partial outer layer of cladding rods thereby to provide separation between core regions of respective adjacent stacks when stacked in the desired arrangement, the method further comprising: stacking the plurality of drawn stacks together in the desired arrangement to form a further stack; drawing the further stack; and using the drawn further stack to form an imaging fibre apparatus.

Provided is an image guide fiber that improves image quality while preventing a manufacturing problem. The image guide fiber according to the present disclosure has a numerical aperture NA in the range of 0.70 to 0.90. A linear thermal expansion coefficient difference , which is a value obtained by subtracting a linear thermal expansion coefficient .sub.2 at from 100 to 300 C. of clad glass, from a linear thermal expansion coefficient .sub.1 at from 100 to 300 C. of core glass, is in the range of 310.sup.7/ C. to 1510.sup.7/ C. A glass-transition temperature Tg.sub.1 of the core glass is higher than a glass-transition temperature Tg.sub.2 of the clad glass. A core occupancy area ratio is 25% or more. A pixel density is 0.1 pixel/m.sup.2 or more.

A method of manufacturing a preform, the method including positioning at least one glass tube in a glass outer cladding to form a preform precursor, the glass tube comprising a first open end and a second open end, forming a preform from the preform precursor, and thermally treating at least one of the preform precursor and the preform. The thermally treating including sealing the first open end and the second open end of the glass tube to form a closed tube and heating and/or cooling the glass tube to manipulate gas pressure within the closed glass tube.

A method of manufacturing a hollow core optical fiber, the method including positioning at least one glass tube in a glass outer cladding to form a preform precursor, the glass tube comprising a first open end and a second open end, and forming a preform from the preform precursor. The method further including drawing the preform into a hollow core optical fiber and, while drawing the preform, thermally treating the preform to manipulate gas pressure within the glass tube by at least one of (i) heating at least a portion of the preform to increase gas pressure within the glass tube and (ii) cooling at least a portion of the preform to decrease gas pressure within the glass tube.

The present invention relates to the field of special glass materials and preparation, in particular to a glass composition resistant to ion bombardment, a cladding glass of microchannel plate, a microchannel plate and a preparing method thereof. The coordination between the components and the adjustment of the dosage, in particular, oxides with high bond energy containing scandium and/or strontium and/or zirconium and/or molybdenum, can be introduced into the glass material, so as to improve the surface binding energy (SBE), thereby improving the ion bombardment resistance of the glass material and significantly prolonging the working life of the microchannel plate during detecting high-energy ions directly, while meeting other necessary properties such as good anti-crystallization, good acid and alkali resistance, appropriate softening temperature, thermal expansion coefficient, and bulk resistance, etc.