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Glass Structures

The specialists of TEGS Ltd. developed unique technologies of fabrication of complicated glass structures based on assembling and repeated drawing of preliminary drawn tubes, capillaries and rods. These elements can be fabricated of different glass types correlating in TCLE and viscosity. The item channels or separate capillaries can be filled with some metals and other materials, for example glasses with correlating thermal behaviour. The structures edge surface can be covered with metal. In this case the length of the channel inner wall metal covering is about half of the channel diameter.

73кх Separation column for chromatography

Policapillary structures are fabricated by way of one or repeated assembling and drawing of intermediate elements. According to the repeated drawing technology keeping the structures similarity that was developed by our specialists, we fabricate items with micron ans sub-micron elements dimensions with strictly specified structure with the elements geometry variation less than 1 percent. Policapillaries cross section may be circular, rectangular and hexagon shaped. The typical channels arrangement is hexagonal. The channels shape may be circular, elliptical or hexagonal. The policapillary items (rods and fibers) length is up to 1m.

Such items may be used as separation columns for gas-liquid, gas-solid and liquid chromatography. These items keep their qualities when gas passes through the channels under the pressure up to 200 Bar and when they are heated up to 1400С.

Policapillary rods with the specified diameter variation law are used as X-ray lenses. The channels inner diameter sets the range of obtainable energies of X-ray quantums and lenses transmission.

Fiber-optic Plate FOP

Fiber-optic items at TEGS Ltd. are fabricated in the following way: at first single-core light fibers having a core and one or several shells depending on the item designation are fabricated. Them these fibers are assembled in a bunch and drawn into a multi-core light fiber (MCLF). The unit fabricated of MCLF is sintered in a bulb-shell at high external pressure with further annealing. After the unit sintering the shell may be removed and the unit edges may be machined. Further technological operations depend on the item designation. The maximum unit diameter without shell is up to 40mm, the length is up to 200mm.

5-Channel Flat capillaries Flat capillaries

Different flat one- and multichannel capillaries with one row channels positioning are fabricated of plate glass. They can be used, for example for immunology research (five-channel capillary with channels dimensions 150х400microns for leukocyte migration inhibition test) and for toxicity level measurement in image analyzer АТ-05. The channels can be circular of square and positioned in several rows.

The items are fabricated according to the specifications agreed by the Customer. Glass grades, used at our company are shown in Table.

The technologies developed at TEGS Ltd. allow to fabricate cylindrical microlenses used for laser diodes radiation divergence compensation. Microlenses are fabricated of optical glass and can have 2 cylindrical surfaces with the lens cross section shape specified by the Customer.

Micro-Channel Plates (MCP)

Micro-channel plates at TEGS Ltd. are fabricated in the following way: at first single elements with soluble glass core and working chemically resistant glass shell are drawn. Then these elements are assembled in a bunch and are drawn into a multi-element rod. If necessary assembling and drawing are repeated. The unit assembled of such multi-element rods is sintered in a hermetic bulb-shell at high external pressure with further annealing. After sintering the unit is cut by a diamond blade into plates of a specified thickness and soluble glass is chemically removed from the channels. The plate may be circular or rectangular shaped. The maximum diameter of the plate without shell is 40mm, the thickness is from 0,6 to 5mm. The minimum channel size is ~ 7 microns.

Various micro-channel plates

MCP Samples:

MCP sampleMCP sample

MCP microscope view:
MCP microscope view

Microcapillary plates can be used for large organic molecules registration and for ultrafine biologic molecules and nanoparticles filtration. Plates with the channel size ~15microns can be used as biosensors and filters of DNA molecules. Microcapillary plates can also be used as X-ray transfer devices.

Metal can be vacuum applied to the plate porous surface. In this case the length of the channel inner wall metal covering is about ~0,5 of the channel diameter. Such structures can be used in physical laboratories.

The use of different glasses allows to fabricate microcapillary plates with solid channels that can be used as matrices for biochips with large number of points (up to several hundred thousands).

Microstructured and Photonic-Crystal Optical Fibers

For fabrication of micro-, nanostructured and photonic-crystal optical fibers the technologies based on the assembling and repeated drawing of the prefabricated tubes, capillaries and rods are used. The fiber material is optical glasses and glasses activated by rare-earth elements. The fiber outer diameter is from 100microns to 300microns. The long fibers are wound onto special reels.

Optical fibers fabricated using such technologies can be divided into micro-, nanostructured and photonic-crystal.
In the first type fibers the elements (for example air channels) arrangement in the cross-section is not strictly periodic or their diameter varies from layer to layer. The guiding action of such fibers is due to the complete inner reflection of light from the boarder of usually solid core with holed shell having lesser average refraction index.

Photonic-crystal fibers usually have periodic elements arrangement in the shell and their guiding action is due to resonant light reflection from the periodic shell. In this case such fibers core can be hollow and it significantly reduces losses in such fiber.

Microstructure im02

Microstructured and photonic-crystal fibers of different structure fabricated at TEGS Ltd. were used for transfer of high energy laser radiation for material treatment, for obtaining of ultrawideband optical continuum, for higher harmonics generation and optical parametrical processes investigation.


The use of optical glass as the fiber material allows to fabricate fibers with unique characteristics: fibers, in which part of channels is filled with metallic alloys or semiconductor materials, fibers with polarization anisotropy up to 4mm-1, fibers with K-rating factor more than 1000(km Wt)-1, fibers with hollow core with the diameter up to 50microns, active fibers with rare-earth ions concentration, corresponding to the active elements of phosphate glass lasers and significantly exceeding the concentration maximum allowable in silica fibers.

Due to the fact that ordinary optical glasses have losses significantly exceeding the losses in pure MCVD silica, it is reasonable to use glass microstructured and photonic-crystal fibers with the length up to several meters.

Upon request of the Customer the specialists of our company can calculate the fiber structure that agrees with the developed technology and is optimized for special applications.