Light fibers made from components of a type II eutectic system

• US 4,345,177 A
• Filed: 11/17/1980
• Issued: 08/17/1982
• Est. Priority Date: 03/09/1979
• Status: Expired due to Term

• Current Assignee: Regents of the University of California (University of California)
• Original Assignee: Regents of the University of California (University of California)
• Inventors: Parsons, James D., Yue, Alfred S.
• Primary Examiner(s): Segal, R.
• Application Number:
  US06/207,143
• Time in Patent Office: 638 Days
• Field of Search: 350/96.24, 350/96.33, 350/96.25, 350/96.30, 65/4, 23/304, 313/475
• US Class Current: 313/475
• CPC Class Codes: C30B 21/02 by normal casting or gradient freezing

Abstract

A directionally solidified, optically conductive eutectic system and method of forming the same. A Type II eutectic which divides into fiber and matrix phases when directionally solidified consists of a fiber phase having a lesser molecular weight but higher refractive index than the matrix phase. The resulting fiber array is optically conductive, and may be used to advantage in applications such as CRT screens, waveguides, fiber optic image intensifiers, and lasers.

Claims

1. An optical radiation conducting system comprising:

electro-magnetic conductive means for receiving and conducting optical radiation, said conductive means including a matrix material comprising a first component of a type II eutectic system and a plurality of mutually spaced optical energy conductive fibers within said matrix material, said fibers being formed from a second material component of said Type II eutectic system, said fiber material being characterized by a lesser molecular weight, but greater refractive index than said matrix material; and

means for generating optical radiation and supplying it to a first end of said fibers whereby said optical radiation is conducted through said fibers to a second end of said fibers.

2. An optical radiation conducting system according to claim 1 wherein said means for generating optical radiation includes an electron beam source;

a fluorescent coating over the first ends of said fibers and means for directing said electron beam to said fluorescent coating to produce said optical radiation, said optical radiation being conducted through said fibers to the second end of said fibers.

3. An optical radiation conducting system according to claim 2 wherein said fibers are substantially parallel and of sufficient density to transmit a high resolution image to the second end of said fibers.

4. An optical radiation conducting system according to claim 1 wherein said means for generating optical radiation includes a plurality of micro-channels having outer ends for receiving electro-magnetic radiation, and inner ends which are colinear with said fibers and terminate at the first end of said fibers, said micro-channels having interior surfaces with a secondary electron emission coefficient of greater than one to provide a source of secondary electron emission to intensify said electro-magnetic radiation entering said micro-channels.

5. An optical radiation conducting system according to claim 4 wherein the first ends of said fibers are coated with flourescent material to provide a microscreen on said fiber first end to produce optical radiation from said secondary electron emissions.

6. An optical radiation conducting system according to claim 5 wherein said micro-channel interior surfaces are coated with a fluorescent material to enhance said secondary electron emission in said micro-channels.

7. An optical radiation conducting system according to claim 1 wherein said means for generating optical radiation includes reflecting means at one end of said fibers for reflecting electromagnetic radiation back into said fibers and partially reflecting means at the other end of said fibers for partially reflecting said electromagnetic radiation and transmitting a laser beam, said means for generating said optical radiation further including sufficient lasing material distributed within said fibers to initiate lasing action when electro-magnetic radiation is transmitted to said optically conductive means.

8. An optical radiation conducting system according to claim 1 wherein said matrix material is selected from the group consisting of KF and CaF₂ and said fiber material is selected from the group consisting of LiF and MgO.

10. The fiber optic image intensifier of claim 1, said matrix material comprising KF, and said fiber material comprising LiF.

9. A fiber optic image intensifier, comprising:

a micro-channel plate formed from a matrix having a light receiving surface, a light transmitting surface, and a plurality of substantially colinear micro-channels extending between said light receiving and transmitting surfaces,

the interior surfaces of said micro-channels from said light receiving surface to an inward location within said plate each having a secondary electron emission coefficient greater than one, each micro-channel further comprising an optical fiber from said inward location substantially to said light transmitting surface, and a fluorescent coating providing a microscreen at the inward end of said optical fiber, said interior micro-channel surfaces providing a source of secondary electron emission to intensify electron radiation entering the channel from said light receiving surface, and said optical fibers providing paths to said transmission surface for an intensified signal, said matrix being of a material comprising a first component of a type II eutectic system, and said optical fibers being formed from a second material component of said type II eutectic system, said fiber material being characterized by a lesser molecular weight but greater refractive index than said matrix material.

11. The fiber optic system of claim 9, said micro-channels including an interior coating of a fluorescent material to enhance the channel secondary electron emission.

12. In a laser system comprising a source of electro-magnetic radiation, a lasing medium adapted to be illuminated by said source, a reflecting means at one end of said lasing medium for reflecting electromagnetic radiation emitted from said medium back into said medium and a partially reflecting means at the other end of said lasing medium for transmitting a laser beam, the improvement comprising:

said lasing medium comprising an elongate, directionally solidified type II eutectic system extending generally along an axis between said reflecting means and partially reflecting means, said system comprising a matrix and a plurality of optically conductive fibers distributed within said matrix substantially colinear with the system axis, said matrix being formed of a material comprising a first component of said eutectic system, and said optical fibers being formed from a second material component of said type II eutectic system, said fiber material being characterized by a lesser molecular weight but greater refractive index than said matrix material and having distributed therein a lasing material in sufficient quantity to initiate a lasing action when the radiation source is actuated.

13. A laser rod, comprising an elongate, directionally solidified type II eutectic system extending generally along an axis, said system comprising a matrix formed from a first component of said system and a plurality of optically conductive fibers formed from a second material component of said system and distributed within said matrix substantially colinear with the system axis, said fiber material being characterized by a lesser molecular weight but greater refractive index than said matrix material and having distributed therein a lasing material in sufficient quantity to initiate a lasing action when the rod is illuminated by a laser source of electromagnetic radiation.