Abstract:
The invention relates to a method for producing an infrared transmitting fiber (50) comprising the steps of providing a preform (20) of the infrared transmitting fiber (50) to be produced, said preform (20) comprising a receptacle, which is the precursor of the fiber's cladding, and a solid solution provided inside said receptacle, said solid solution being the precursor of the fiber's core; heating the fiber's preform (20) up to a temperature in which the receptacle softens and the solid solution melts; collecting the flow generated by the softened receptacle; drawing the fiber (50) from the collected flow.
Abstract:
The invention concerns a process for producing micro-optical elements or a fibre end in the form of a micro-optical element, a base material being shaped to form the required micro-optical element. As a process by which elements can be produced and reproduced in larger batches, are transparent with low loss levels over a greater (i.e. wider band) spectral range than prior art elements, are not restricted in their possible surface geometry and are inexpensive to manufacture, a crystalline or polycrystalline fibre or section thereof which is substantially absorption-free in the spectral range 0.4 - 30 mu m and is produced from a base material of a solid solution, is shaped to produce micro-optical elements with that spectral range. The invention also concerns advantageous uses and applications of the disclosed micro-optical elements.
Abstract:
Es ist ein Verfahren zur Herstellung von synthetischem Quarzglas bekannt, umfassend die Verfahrensschritte: (a) Umsetzen eines eine kohlenstoffhaltige Siliziumverbindung enthaltenden Einsatzmaterials mit Sauerstoff in einer Reaktionszone zu SiO 2 -Partikeln, (b) Abscheiden der SiO 2 -Partikel auf einer Ablagerungsfläche unter Bildung eines Kohlenstoff und Hydroxylgruppen enthaltenden, porösen SiO 2 -Sootkörpers, (c) Trocknen des porösen SiO 2 -Sootkörpers, und (d) Verglasen zu dem synthetischen Quarzglas durch Erhitzen des Sootkorpers auf eine Verglasungstemperatur. Um hiervon ausgehend ein Verfahren anzugeben, das eine kostengünstige Herstellung von Quarzglas durch Pyrolyse oder Hydrolyse einer kohlenstoffhaltigen Siliziumverbindung unter Einsatz eines kohlenstoffhaltigen Einsatzmaterials ermöglicht, wird erfindungsgemäß vorgeschlagen, dass ein Sootkörper mit einem Kohlenstoffgehalt im Bereich von 1 Gew.-ppm bis 50 Gew.-ppm erzeugt wird.
Abstract:
A photonic band gap fiber and method of making thereof is provided. The fiber is made of a non-silica-based glass and has a longitudinal central opening, a microstructured region having a plurality of longitudinal surrounding openings, and a jacket. The air fill fraction of the microstructured region is at least about 40%. The fiber may be made by drawing a preform into a fiber, while applying gas pressure to the microstructured region. The air fill fraction of the microstructured region is changed during the drawing.
Abstract:
To overcome problems of fabricating conventional core-clad optical fibre from non-silica based (compound) glass, it is proposed to fabricate non-silica based (compound) glass optical fibre as holey fibre i.e. one contining Longitudinal holes in the cladding. This removes the conventional problems associated with mismatch of the physical properties of the core and clad compound glasses, since a holey fibre can be made of a single glass composition. With a holey fibre, it is not necessary to have different glasses for the core and cladding, since the necessary refractive index modulation between core and cladding is provided by the microstructure of the clad, i.e. its holes, rather than by a difference in materials properties between the clad and core glasses. Specifically, the conventional thermal mismatch problems between core and clad are circumvented. A variety of fibre types can be fabricated from non-silica based (compounds) glasses, for example: single-mode fibre; photonic band gap fibre; highly non-linear fibre; fibre with photosensitivity written gratings and other refractive index profile structures; and rare-earth doped fibres (e.g. Er, Nd, Pr) to provide gain media for fibre amplifiers and lasers.
Abstract:
There is disclosed a fiber optic waveguide which is particularly suited for infrared radiation transmission at extended wavelengths. The core of the waveguide is fabricated from heavy ionic compounds selected from metal halides in order to achieve such extended infrared transparency. While it is impossible to prepare these materials into optical fibers using conventional fiber drawing techniques, the present invention teaches how such materials may be prepared into optical fibers using an extrusion process at elevated temperatures and high pressures.
Abstract:
A preform is prepared to comprise a step index structure consisting of a core and a clad both made of metal halogenides or arsenic-selenium glass sparingly capable of transmitting infrared light of long wavelength and a layer of lubricant applied to the outer surface of the clad. The preform is set inside a metal cylinder. By pulling this metal cylinder through a plurality of dies containing orifices of successively decreased diameters at a temperature below the melting point, the preform can be elongated into an optical fiber of a prescribed diameter. The optical fiber thus produced is capable of transmitting infrared light of high power with a small loss. Protected and reinforced by the metal cylinder jacket, this fiber enjoys high mechanical strength.