Quartz glass tube as a semi-finished product for an optical component

Patent metadata

Field	Value
Publication number	US-10183886-B2
Application number	US-201314372734-A
Country	US
Kind code	B2
Filing date	Jan 17, 2013
Priority date	Jan 17, 2012
Publication date	Jan 22, 2019
Grant date	Jan 22, 2019

Abstract

A quartz glass tube as a semi-finished product for an optical component that has an inner bore extending along a tube center axis for the acceptance of a core rod and a tube wall limited by an inner casing surface and an outer casing surface is already known; within said tube wall an inner region made of a first quartz glass and an outer region made of a second quartz glass with a different index of refraction surrounding the inner region contact one another at a contact surface which runs around the center axis. In order to provide a quartz glass on this basis that facilitates the production of optical components for special applications such as laser-activated optical components in wand or fiber form, the invention states that the contact surface has a non-round course in the radial cross-section and the inner casing surface has a circular course.

First claim

The invention claimed is:

1. A quartz glass tube comprising:
a tube wall having an inner surface and an outer surface, with said inner surface defining an inner bore extending along a tube center axis, and
said tube wall comprising an inner region of a first quartz glass surrounding the inner bore and an outer region of a second quartz glass surrounding the inner region,
wherein said inner region and said outer region are adjacent to each other on a contact surface that extends around the center axis,
wherein said first quartz glass and said second quartz glass have refractive indices that differ from each other, and
wherein in a radial cross-section the contact surface has a non-round profile and the inner surface has a circular profile.

2. The quartz glass tube according to claim 1 , wherein the contact surface in the radial cross-section has at least one corner.

3. The quartz glass tube according to claim 1 , wherein the contact surface in the radial cross-section has a polygonal profile.

4. The quartz glass tube according to claim 1 , wherein the contact surface in the radial cross-section has a profile with alternatingly straight and curved longitudinal sections or with longitudinal sections alternatingly curved to left and right sides thereof.

5. The quartz glass tube according to claim 1 , wherein the contact surface between the inner region and the outer region is a first contact surface surrounded within the tube wall by a second contact surface, the second contact surface also defining regions of quartz glass with different refractive indices and having a profile that is non-circular in the radial cross-section.

6. The quartz glass tube according to claim 1 , wherein the outer surface has a circular profile.

7. The quartz glass tube according to claim 1 , wherein the inner bore extends concentrically relative to the center axis.

8. The quartz glass tube according to claim 1 , wherein the quartz glass of the outer region is doped with fluorine.

9. The quartz glass tube according to claim 1 , wherein the inner region consists of undoped quartz glass.

10. The quartz glass tube according to claim 1 , wherein the tube wall comprises an inner layer that extends between the inner bore and the inner region, and that consists of quartz glass having a higher refractive index than undoped quartz glass.

Assignees

• Heraeus Quarzglas
• Heraeus Quarzglas

Inventors

• Schötz Gerhard
• Bräuer Karsten
• Schmidt Richard
• Bauer Peter
• Schultheis Andreas
• Schmitt Clemens
• Langner Andreas

Classifications

• Y10T428/2935

  Discontinuous or tubular or cellular core · CPC title

• C03B2203/32

  Eccentric core or cladding · CPC title

• C03B2201/12

  doped with fluorine (C03B2201/14 takes precedence) · CPC title

• C03B37/01426

  Plasma deposition burners or torches · CPC title

• C03B2203/31

  by use of stress-imparting rods, e.g. by insertion · CPC title