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Optical component containing a maximum of 200 wt.-ppm of chlorine
| Details |
Inventors: Schotz, Gerhard; Vydra, Jan;
Assignee: Heraeus Quarzglas GmbH & Co. KG (Hanau, DE)
Primary Examiner: Font; Frank G.
Assistant Examiner: Nguyen; Tu T.
Attorney, Agent or Firm: Fulbright & Jaworski, LLP
In a known optical component a cylindrical glass core of synthetic quartz glass contains hydroxyl groups, a maximum 200 wt.-ppm of chlorine, and no dopant in the form of a metal oxide. The glass core is axially enveloped by a glass mantle of doped quartz glass which has a lower refractive index than the glass core. Setting out from this, in order to offer an optical component of quartz glass for broad-band transmission, especially for broad-band spectroscopy, which is characterized by low attenuation over a broad range of wavelengths, it is proposed by the invention that the core glass contain less than 5 wt.-ppm of hydroxyl groups. |
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DETAILED DESCRIPTION What is claimed is: 1.
Optical component with a cylindrical core glass of synthetic quartz glass containing hydroxyl groups, a maximum 200 wt.
-ppm of chlorine, and no doping in the form of a metal oxide, and with a cladding glass axially surrounding the core glass and consisting of doped quartz glass having a lower index of refraction than the core glass, characterized in that the core glass contains less than 5 wt.
-ppm of hydroxyl groups, wherein the core glass contains at least 2000 wt.
-ppm fluorine.
2.
Optical component according to claim 1, wherein the core glass contains less than 1 wt.
-ppm of hydroxyl groups.
3.
Optical component according to claim 1, wherein the chlorine content of the core glass amounts to 100 wt.
-ppm at most.
4.
Optical component according to claim 1, wherein the fluorine content of the core glass is in the range between 5000 wt.
-ppm and 10,000 wt.
-ppm.
5.
Optical component according to claim 1, wherein the cladding glass contains fluorine in a concentration in the range between 3 wt.
-% and 5 wt.
-%.
Description:
The invention relates to an optical component having a cylindrical core glass of synthetic quartz glass which contains hydroxyl groups and a maximum 200 wt.
-ppm of chlorine and no dopant in the form of a metal oxide, and which is axially enveloped by a glass cladding of doped quartz glass having a lower index of refraction than the core glass.
Subject matter of the invention can be, for example, an optical fiber or a preform for the production of an optical fiber.
A preform with a core of synthetic quartz glass with low chlorine content and an optical fiber drawn from it is described for example in U.
S.
Pat.
No.
4,650,511.
To improve the long-term stability of the fiber in a moist or a hydrogen-containing atmosphere the chlorine content of the core glass is kept low.
In an embodiment the chlorine content is set at 5 ppm and the hydroxyl group concentration of the core glass at 50 ppb.
To increase the index of refraction the core glass is doped with germanium oxide
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