Abstract:
The inventive single-mode electrooptical fibre and a method for the production thereof relate to optical engineering and can be used for data transmitting and processing systems. Fibres exhibiting an improved electrooptical effect are made of glass whose Kerr constant is 1.5 orders greater than that of a quartz glass and provided with a specified clad layer and core profiles. Said fibre consists of a core (8), light-transmitting clad layer (9), light absorbing clad layer (11) provided with light absorbing elements (12) and current conductive electrodes (13) which are disposed in said clad layer (11) in such a way that they form different geometrical patterns. The inventive method consists in drawing individual glass tubes from glass rods in the form of the fibre parts, assembling hexagonal or square-shaped packets including the electrode (13) placing in said packets along the cross section thereof, subsequently drawing a preform in the range of 1 to several millimetres and in overdrawing said preform into a fibre whose diameter ranges from 50 to 250 mkm with simultaneous application of a polymeric coating. Said invention increases the electrooptical effect of a fibre and simplifies a fibre drawing process.
Abstract:
A drawn glass-coated metallic member has a thermal contraction coefficient differential such that the thermal contraction coefficient of the glass is less than that of the metallic member. The thermal contraction coefficient differential is maintained within a predetermined range during drawing. The glass is placed under residual compression, interfacial bonding between said glass and said wire is substantially uniform, and surface cracking and bond breaks between metal and glass are substantially prevented. A dynamic balance is maintained between the surface tension of the molten alloy and the resistance to high temperature deformation by the glass vessel in which it is contained, enabling the production of glass-coated amorphous or nanocrystalline alloy members having predefined cross-sectional shapes.
Abstract:
A reflective display is formed using two orthogonal fiber arrays and an electro-optic material. The bottom fibers contain plasma channels, used to address the electro-optic material. Wire electrodes built into the fibers address both the plasma and the electro-optic material. The fibers are composed of glass, plastic or a combination of glass and plastic. Color is imparted into the display using colored fibers, adding a color coating to the surface of the fibers, or adding the color to the electro-optic material. The electro-optic material consists of a liquid crystal material, electrophoretic material, bichromal sphere material, electrochromic material, or any electro-optic material that can serve to create a reflective display. Another possible reflective display is formed using an array of hollow tubes filled with an electrophoretic material sandwiched between two plates.
Abstract:
A method of forming a preform which has a glass core (10) surrounded by an outer glass cladding (16) with a coating (18) of an optically active material disposed between the core (10) and cladding (16). The method includes providing a glass core (10) having a viscosity which lies within a given preselected temperature range, followed by forming a substantially homogeneous coating (18) of an optically active material over the surface of the core, with the coating having a viscosity which is equal to or less than the viscosity of the glass core. A glass cladding (16) is formed over the coated layer (18), with the cladding (16) having a viscosity which overlaps the viscosity of the core glass (10) and a thermal coefficent of expansion compatible with that of the core. The optically active material is an inorganic material which includes a metal, metal alloy, ferrite, magnetic material or a semiconductor. The invention includes the product formed by the process.
Abstract:
An optical article having a rare earth doped, fluorinated aluminosilicate glass core composition consisting essentially, in mole %, of: SiO2 0-90; GeO2 0-90; Na2O 0-25; Li2O 0-10; K2O 0-25; Rb2O 0-25; Cs2O 0-25; Al2O3 5-40; Ga2O3 5-40; RE2(1)O3 0-40; RE2(2)O3 0-1; Er2O3 0.001-5; Yb2O3 0-5; PbO 0-15; RO 0-20; ZnO 0-10; ZrO2 0-2; TiO2 0-2; Nb2O5 0-10; Ta2O5 0-10; P2O5 0-5; B2O3 0-15; As2O3 0-10; Sb2O3 0-20; Na2Cl2 0-10; Bi2O3 0-5, and up to 15 weight % fluorine in the form of at least one of a fluorinated component of the glass composition and a batch constituent selected from a group consisting of at least one of AlF3, REF3, NH5F2, NaF, Na2SiF6, Na3AlF6.
Abstract:
A method for preparing glass-coated microwires is provided. A metal (12) in a glass tube (11) is superheated in a high frequency induction field (13), whereby the glass and the glass tube fills with molten metal. The metal-filled capillary enters a cooling zone (16) in the superheated state and the rate of cooling is controlled such that a microcrystalline or amorphous metal microstructure is obtained. The cooling zone (16) includes a stream of cooling liquid (17) through which the capillary passes. The microstructure of the microwire is controlled by choice of amorphisizers, cooling rate, nature of the cooling liquid, location of the cooling stream, dwell time in the cooling stream and degree of superheating and supercooling of the metal.
Abstract:
A method for preparing glass-coated microwires is provided. A metal (12) in a glass tube (11) is superheated in a high frequency induction field (13), whereby the glass and the glass tube fills with molten metal. The metal-filled capillary enters a cooling zone (16) in the superheated state and the rate of cooling is controlled such that a microcrystalline or amorphous metal microstructure is obtained. The cooling zone (16) includes a stream of cooling liquid (17) through which the capillary passes. The microstructure of the microwire is controlled by choice of amorphisizers, cooling rate, nature of the cooling liquid, location of the cooling stream, dwell time in the cooling stream and degree of superheating and supercooling of the metal.