The present invention relates to a composition and a process for the production of a molding made of high-purity transparent quartz glass, by means of additive manufacturing.

According to one embodiment, a forming body of a glass forming apparatus may include an upper portion with a first forming surface and a second forming surface extending from the upper portion. The first forming surface and the second forming surface may converge at a bottom edge of the forming body. A trough for receiving molten glass may be positioned in the upper portion of the forming body. The trough may include a first weir, a second weir opposite from and spaced apart from the first weir, and a base extending between the first weir and the second weir. At least a portion of a vertical surface of the first weir may curve inward towards a centerline of the trough. Similarly, at least a portion of a vertical surface of the second weir may curve inward towards the centerline of the trough.

Glass fibers have a chemical composition that includes the following constituents, in a weight content that varies within the limits defined below: SiO.sub.2 50-70%, Al.sub.2O.sub.3 0-5%, CaO+MgO 0-7%, Na.sub.2O 5-15%, K.sub.2O 0-10%, BaO 2-10%, SrO 2-10%, ZnO <2%, and B.sub.2O.sub.3 5-15%.

Doped, low-temperature co-fired ceramic (LTCC) insulating substrates and related wiring boards and methods of manufacture are disclosed. The doped, LTCC insulating substrate is formed from a baked (e.g., sintered) glass-ceramic aggregate material formed from a glass material, a ceramic filler material, and a composite oxide. The crystallized glass-ceramic aggregate is then doped with Iron and/or Manganese before baking. Iron or Manganese can further reduce dielectric loss and the loss tangent of the LTCC insulating substrate formed from that glass material. The glass material becomes crystallized due to an oxide crystal phase being deposited on the glass material during baking, which reduces the dielectric losses. This may be important for the application use as wiring boards for high radio-frequency (RF) electrical circuits where low dielectric loss and loss tangent is desired to achieve a desired signal transmission delay performance.

Doped, low-temperature co-fired ceramic (LTCC) insulating substrates and related wiring boards and methods of manufacture are disclosed. The doped, LTCC insulating substrate is formed from a baked (e.g., sintered) glass-ceramic aggregate material formed from a glass material, a ceramic filler material, and a composite oxide. The crystallized glass-ceramic aggregate is then doped with Iron and/or Manganese before baking. Iron or Manganese can further reduce dielectric loss and the loss tangent of the LTCC insulating substrate formed from that glass material. The glass material becomes crystallized due to an oxide crystal phase being deposited on the glass material during baking, which reduces the dielectric losses. This may be important for the application use as wiring boards for high radio-frequency (RF) electrical circuits where low dielectric loss and loss tangent is desired to achieve a desired signal transmission delay performance.

An embodiment of the invention relates to an optical device which is capable of realizing a secondary nonlinear optical phenomenon. The optical device is a fiber-type optical device which is comprised of glass containing SiO.sub.2, and includes a core region, a first cladding region, and a second cladding region. At least a part of a glass region configured by the core region and the first cladding region has such a repetition structure that a first section serving as a poled crystal region and a second section serving as an amorphous region are alternately disposed along a longitudinal direction of the optical device.

An embodiment of the invention relates to an optical device which is capable of realizing a secondary nonlinear optical phenomenon. The optical device is a fiber-type optical device which is comprised of glass containing SiO.sub.2, and includes a core region, a first cladding region, and a second cladding region. At least a part of a glass region configured by the core region and the first cladding region has such a repetition structure that a first section serving as a poled crystal region and a second section serving as an amorphous region are alternately disposed along a longitudinal direction of the optical device.

In a multicore optical fiber sensor, an absorptive material integrated into the cladding, or into a waveguide core not used for sensing, may facilitate sensing. The absorptive material is absorptive to light in a wavelength band in which the fiber sensor is configured to operate. Coating such a fiber sensor with a material whose refractive index is smaller than that of the cladding may be done with reduced signal mixing.

A method for preparing a doped optical fibre preform includes formulating, a rare earth material or a functional metal material and a co-doping agent into a doping solution, mixing a high-purity quartz powder with the doping solution, drying same at a temperature of 100 C.-150 C. for 12-48 hours, crushing and screening the same to obtain a doped quartz powder; depositing the doped quartz powder onto the surface of a target rod to form a doped core layer; replacing the doped quartz powder with the high-purity quartz powder, and depositing the high-purity quartz powder onto the surface of the doped core layer to form a quartz outer cladding; and removing the target rod, and gradually collapsing the entirety formed from the doped core layer and the quartz outer cladding at a high temperature to obtain the doped optical fibre preform.

A microheater comprises an optical fiber including a rare earth-doped glass core surrounded by a glass cladding. The rare earth-doped glass core comprises a rare earth dopant at a concentration sufficient for luminescence quenching such that, when the rare earth dopant is pumped with light at an absorption band wavelength, at least about 90% of absorbed pump light is converted into heat.