摘要:
A first object, which comprises organic material, is bonded to a second object by a method whereby both objects are provided with complementary optically smooth surfaces, subsequent to which these surfaces are brought into substantial contact with one another, consequent upon which spontaneous atomic bonds are formed between atoms of the two objects. The strength of the atomic bonds thus formed can be increased by subsequently heating the region of contact of the two surfaces.
摘要:
A new type of glass, for example for use as a TL-envelope glass which as regards phosphor poisoning and Hg penetration has better properties than the present TL-envelope glasses. Phosphor poisoning occurs in particular upon fusing electrodes and bending and severing and bridging, respectively, during the manufacture of SL and PL lamps.Phosphor poisoning is controlled by incorporating little or no Na.sub.2 O in the glass. In order to nevertheless reach good processing properties, a combination of Li.sub.2 O and K.sub.2 O is used in the glass. The addition of only Li.sub.2 O or only K.sub.2 O does not result in a suitable glass.Hg penetration is controlled by the presence of a large quantity of alkaline earth metal oxides in the glass.The glass according to the invention has a good light transmission. A lamp comprising a lamp envelope of a glass according to the invention shows only a small luminous decline during operation of the lamp.
摘要:
An optical fiber of germanium-free, multicomponent glasses has a core glass which has the molecular composition: SiO.sub.2 : 57.5-65%; (ZrO.sub.2 +1/2Y.sub.2 O.sub.3): 0-5%; (MgO+CaO+SrO+BaO+ZnO): 12.5-27.5 where MgO: 0-5%, CaO: 0-10%, SrO: 0-7.5%, BaO: 0-15% ZnO: 0-20%, and in which if no BaO is present, the ZnO content is 12.5-20%, and if no ZnO is present, the BaO content is 5-15%, and (Li.sub.2 O+Na.sub.2 O+K.sub.2 O): 10-25%. The core glass has a K.sub.2 O content which is preferably smaller than half of the total alkali metal oxide content. The cladding glass consists of a silicate glass or a borosilicate glass having a refractive index which is at least 2% lower than the refractive index of the core glass. The viscosity of the cladding glass at the processing temperature is 0.5 to twice the viscosity of the core glass expressed in Pa.s.
摘要翻译:无锗的多组分玻璃的光纤具有芯玻璃,其分子组成为:SiO2:57.5-65%; (ZrO 2 + 1 / 2Y 2 O 3):0-5% (MgO + CaO + SrO + BaO + ZnO):12.5-27.5其中MgO:0-5%,CaO:0-10%,SrO:0-7.5%,BaO:0-15%ZnO:0-20% 如果不存在BaO,ZnO含量为12.5〜20%,如果不存在ZnO,则BaO含量为5〜15%,(Li 2 O + Na 2 O + K 2 O):10〜25%。 核心玻璃的K 2 O含量优选小于总碱金属氧化物含量的一半。 包层玻璃由折射率比核心玻璃的折射率低至少2%的硅酸盐玻璃或硼硅酸盐玻璃组成。 包层玻璃在加工温度下的粘度是以Pa.s表示的芯玻璃的粘度的两倍。
摘要:
An optical fiber of the graded index type consisting of a glass having predominantly the composition 60-70 mole % SiO.sub.2, 15-30 mole % alkali metal oxides, and 10 to 15 mole % MgO in combination with at least one oxide selected from the group formed by CaO, SrO, BaO and ZnO. The impurity content of the fiber is less than 0.01 ppm. In the fiber the MgO content increases from the axis of the fiber to the circumference of the fiber. The oxide or the other oxides, having cations which can be exchanged for the magnesium cation, decrease to a corresponding extent in this direction.