Abstract:
A borosilicate glass composition comprises SiO2 having a concentration of about 40 mole percent to about 60 mole percent, B2O3 having a concentration of about 10 mole percent to about 30 mole percent, and an alkaline earth and/or alkali compound having a concentration of 10 mole percent to about 40 mole percent. An optical fiber amplification device comprises a borosilicate glass material cladding. The core comprises a germanate glass material doped with Tm3+. The germanate glass material has a first surface configured to receive an optical signal having a wavelength of from about 1400 nm to about 1540 nm and a second surface configured to output an amplified optical signal. In this manner, low cost fiber amplifiers in the 1450-1530 nm wavelength region (corresponding to the S-band) can be achieved.
Abstract:
A method that provides a new way to embed rare earth fluorides into silicate (or germania-doped silica) glasses by means of solution chemistry. Embedding rare earth fluorides into a silicate (or germania-doped silica) glass comprises the following steps. First, form a porous silicate core preform. Second, submerge the preform into an aqueous solution of rare earth ions. Third, remove the preform from the solution and wash the outside surfaces of the preform. Fourth, submerge the preform into an aqueous solution of a fluorinating agent to precipitate rare earth trifluorides from the solution and deposit in the pores or on the wall of the preform. This is followed by drying.
Abstract:
An apparatus for producing a glass soot includes a first a burner having a droplet-emitting first region, a gas-emitting second region surrounding the first region, and a gas-emitting third region surrounding the second region. The first region emits a glass-forming mixture, the second region emits an inert gas, and the third region emits a combination of oxygen and a combustible gas. The apparatus further includes a combustion area having a first section proximate the first burner and a second section distal from the first burner. A glass-forming mixture is at least partially vaporized in the first section of the combustion area. The apparatus further includes at least one secondary burner having gas-emitting fourth and fifth regions. The fourth region of the secondary burner emits oxygen and the fifth region of the secondary burner emits a combustible gas. The second section of the conversion area is in communication with the fourth and fifth regions of the secondary burner, such that the glass-forming mixture is completely vaporized and converted into a glass soot deposited on a preform such as a bait rod. The invention also includes a method of enhanced vaporization using first and second spaced apart combustion areas.
Abstract:
This invention is directed to the production of essentially defect-free high purity fused silica glass articles, the method comprising the following steps: (a) forming a green body from silica particulates or a porous body of amorphous silica; (b) sintering said body in a chamber by raising the temperature of the chamber to above 1720.degree. C., while purging the chamber with helium or applying a vacuum to the chamber; and (c) consolidating the sintered body in a chamber by raising the temperature within the chamber to at least 1750.degree. C., introducing an inert gas into the chamber at a pressure less than about 6.9 MPa (1000 psig), and cooling the chamber while maintaining the pressurized atmosphere to a temperature at least below the annealing point of the glass. In the most preferred practice, a green body of silica particulates will be prepared via a sol-gel process.
Abstract:
This invention relates to the production of high purity fused silica glass through oxidation or flame hydrolysis of a vaporizable silicon-containing compound. More particularly, this invention is directed to the use of vaporizable, halide-free compounds in said production. In the preferred practice, a polymethylsiloxane comprises said vaporizable, halide-free compound.
Abstract:
Suspensions of particulate oxides, e.g., fumed silica, are prepared in non-aqueous media and the suspensions are used to cast shapes for glass or ceramic products. The suspensions are formed and then caused to gel by means of an added gelling agent, and thereafter dried and, optionally, sintered to transparent glass or void-free ceramic products.
Abstract:
A method for producing a multi-component glass fiber preform which comprises the steps of nebulizing an aqueous solution of at least one metal salt, and reacting the nebulized solution and a gaseous glass raw material with oxygen gas at a high temperature to produce particulate glass material deposited on a substrate. Apparatus for producing such a preform is also disclosed.
Abstract:
Procedures are disclosed for producing both core-cladding optical fibers and self-focusing optical fibers from porous germinate and/or silicate glasses obtained after phase separation and removal of the soluble phase. A glass which is separable into at least two phases one of which is soluble, is heated to cause phase separation. The soluble phase is leached out removing undesired impurities. The pores are collapsed and this glass is used to produce cores and/or cladding layers, or self focusing fibers. According to one aspect of the invention, preforms of the porous glass have their interconnected pores stuffed with a dopant. In the production of core-cladding optical fibers, the dopant modifies the index of refraction of the core and/or cladding so that the index of refraction of the core is greater than that of the cladding. The control of this index of refraction can be accomplished by addition of non silicate network formers such as GeO.sub.2 to the original melt before phase separation. These network formers will stay in the insoluble phase. In producing self-focusing fibers, the dopant may be non-uniformly deposited in order to produce a radial gradient in the index of refraction, or sodium or potassium ions may be ion exchanged into the glass for a portion of a dopant containing lithium or thallium to produce such an index of refraction gradient.
Abstract:
본 발명은 고강도와 심미성을 지닌 크리스토벌라이트 결정상 함유 리튬 디실리케이트 결정화 유리 및 이의 제조방법에 관한 것으로, 더욱 상세하게는 인공치아 소재 중에 리튬 디실리케이트계 결정화 유리에서 이종의 또 다른 결정상인 크리스토벌라이트를 성장시키는 고강도와 심미성을 지닌 크리스토벌라이트 결정상 함유 리튬 디실리케이트 결정화 유리 및 이의 제조방법에 관한 것이다. 이를 위해 본 발명은 Li 2 O 11~13중량%, SiO 2 70.0~77.0중량%, 핵 형성제 역할을 하는 P 2 O 5 2~3중량%, 유리전이온도와 연화점을 증가시키며, 결정화 유리의 화학적 내구성을 증진시키는 Al 2 O 3 2~5중량%, ZrO 2 1~3.0중량%, 조색제 1~4중량%의 유리 조성물을 포함함을 특징으로 하는 크리스토벌라이트 결정상을 함유하는 리튬 디실리케이트 리튬 디실리케이트 결정화 유리를 제안한다.
Abstract translation:本发明涉及具有高强度和美观性的方英石结晶相二硅酸锂玻璃陶瓷及其制备方法,更具体地涉及具有高强度和美观性的方英石结晶相的二硅酸锂玻璃陶瓷,以及用于 制备其中,其中在人造牙齿材料中的二硅酸锂基玻璃陶瓷中,生长另一种不同种类的晶相的方英石生长。 因此,本发明提出了含方英石结晶相的二硅酸锂玻璃陶瓷,其包含含有11〜13重量%的Li 2 O,70.0〜77.0重量%的SiO 2,2-3重量%的作为成核剂的P 2 O 5的玻璃组合物 ,2-5重量%的Al 2 O 3,其增加玻璃化转变温度和软化点,并提高玻璃陶瓷的化学耐久性,1-3.0重量%的ZrO 2和1-4重量%的调色剂。