摘要:
To the outer peripheral surface of an optical fiber made of quartz or glass and having a core and a cladding is applied a microporous silica solution, which is synthesized from a mixture of silicon alcoxide, active alcohol for facilitating hydrolytic action, alcohol, and water, by means of the sol-gel process, followed by baking to form a thin film of microporous silica made chiefly of silicon. Microporous of the thin film of microporous silica have function of cushioning to cushion and restrain that micro cracks much existing in the cladding undergo growth when the optical fiber is bent so that the optical fiber is likely to be broken. And the thin film of microporous silica which made chiefly of silicon has high heat-resistant properties similarly to the optical fiber itself. Accordingly, a heat-resistant optical fiber very excellent in heat-resistant properties is provided.
摘要:
A sol-gel process is disclosed. The process includes forming a sol by dispersing an organic binder and at least two kinds of fumed silica having different particle sizes into de-ionized water and forming a gel by injecting the dispersed sol into a mold.
摘要:
The present invention is generally directed to a method for making sol-gel ceramic nanofibers, and the compositions resulting from practicing such method. Fibers so formed can be used for fabricating filter media and a wide variety of other ceramic fiber structures and devices.
摘要:
A process for cutting or splitting at least one optical fiber at a predetermined angle, wherein the fiber is introduced into a holding and positioning device and is cut by a pulsed laser beam.
摘要:
Sintered materials, especially sintered glasses, produced from pyrogenically produced silicon dioxide which has been processed to silicon granulates in a compacting step, and the use of such granulates in the production of formed glass bodies.
摘要:
An optical fiber having a cladding region surrounding a core region having an elongate core hole, the inner or outer surface of the core hole having a surface roughness with a spatial period equal to or less than 5 μm by a spectral power below 0.0017 nm2μm−1. A method of making an optical fiber including a cladding region having an arrangement of elongate cladding holes in a matrix material, surrounding an elongate core region having an elongate core hole, the method including the step of increasing the surface tension of the matrix material prior to or during the step of heating and drawing the fiber.
摘要:
Disclosed is a method for manufacturing a preform for a photonic crystal fiber (PCF). The method includes the steps of (A) forming a dry gel having a cylindrical shape by forming a silica slurry obtained by mixing a monomer and a dimer and drying the slurry, and (B) forming air holes having the desired size and arrangement through the dry gel, thereby easily regulating the size and arrangement of the air holes and manufacturing various shapes of the preform.
摘要:
In a process for manufacturing a micro-structured optical fibre, an intermediate preform is made by forming a sol; pouring the sol in a cylindrical mould including a set of structural generating elements defining internal structural elements of the intermediate preform; transforming the sol into a gel so as to obtain a cylindrical gel body defining the intermediate preform; and removing the cylindrical intermediate preform from the mould.
摘要:
There are provided tube-shaped glass monolith fabricating apparatus and method using a sol-gel process. In the tube-shaped glass monolith fabricating method using a tube-shaped glass monolith fabricating apparatus which has an upper mold including cylindrical portions of different sizes, a lower mold including a first lower cylindrical portion inclined toward the center thereof by a predetermined degree and a second lower cylindrical portion having a vacuum releasing hole, a cylindrical central mold for forming a tube-shaped glass, and a rod-shaped rod, the lower mold, the central mold, and the rod are assembled and a sol is poured in the central mold. Then, an unmixable liquid is poured on the sol, and the upper mold is assembled to the central mold. The sol is gelled in the central mold, the upper mold is removed, a cap is opened to release vacuum, and the rod is removed. A small amount of the unmixable liquid remains in a gel hole formed in the center of the gel and the vacuum releasing hole is plugged with the cap. An upper portion of the gel hole is sealed with a sealing paper. Subsequently, the gel is dried for a predetermined time, the central mold is removed from the gel, and the gel is dried until the gel completely shrinks. Finally, the sealing paper and the unmixable liquid are removed from the gel. Thus, a tube-shaped dried gel is formed.
摘要:
Heating a wet colloidal gel body in an autoclave above its 1-atmosphere boiling point, under rigorously defined conditions, avoids shrinkage during subsequent drying. As a consequence, drying rates may be increased, and handling care becomes less critical.