Optical resonators that utilize plasma confinement of a laser gain media

Patent metadata

Field	Value
Publication number	US-10582603-B2
Application number	US-201815986201-A
Country	US
Kind code	B2
Filing date	May 22, 2018
Priority date	May 22, 2018
Publication date	Mar 3, 2020
Grant date	Mar 3, 2020

Abstract

Laser amplification utilizing plasma confinement of a gas laser gain media is described. The gas laser gain media is compressed into plasma utilizing a self-reinforcing magnetic field referred to a plasma pinch (e.g., a flow stabilized z-pinch). In the plasma pinch, the gas laser gain media is compressed to a high density, which improves the gain of the media. An optical resonator partially surrounds the plasma pinch and utilizes the laser gain media compressed within the plasma pinch to generate an output of coherent light.

First claim

What is claimed is:

1. An apparatus comprising:
a plasma confinement device configured to generate a plasma pinch of at least one gas of a laser gain media, wherein the plasma confinement device comprises:
an outer electrode in a form of a hollow cylinder;
an inner electrode within an interior of the outer electrode; and
a power source electrically coupled to the outer electrode and the inner electrode that is configured to generate an electric arc between the outer electrode and the inner electrode through the laser gain media,
wherein the electric arc travels along an interior surface of the outer electrode towards an end of the outer electrode to generate the plasma pinch; and

an optical resonator partially surrounding the plasma pinch that is configured to utilize the laser gain media compressed within the plasma pinch to generate an output of coherent light.

2. The apparatus of claim 1 , further comprising:
a vacuum chamber that surrounds the outer electrode, and
a vacuum source configured to generate a vacuum within the vacuum chamber.

3. The apparatus of claim 2 , wherein:
the inner electrode is centered within the interior, and
the plasma pinch is generated centrally within the interior between the inner electrode and an opening through the end of the outer electrode.

4. The apparatus of claim 3 , wherein the optical resonator comprises:
a reflective mirror proximate to the inner electrode; and
a partially reflective mirror proximate to the opening that is configured to reflect the coherent light back through the plasma pinch to the reflective mirror to amplify the coherent light.

5. The apparatus of claim 4 , further comprising:
a magnetic shield proximate to the reflective mirror that is configured to generate a magnetic field that directs ionized laser gain media away from the reflective mirror.

6. The apparatus of claim 5 , wherein:
the magnetic shield comprises permanent magnetic material.

7. The apparatus of claim 5 , wherein:
the magnetic shield comprises an electromagnet.

8. The apparatus of claim 4 , further comprising:
a magnetic shield proximate to the partially reflective mirror that is configured to generate a magnetic field that directs ionized laser gain media away from the partially reflective mirror.

9. The apparatus of claim 8 , wherein:
the magnetic shield comprises permanent magnetic material.

10. The apparatus of claim 8 , wherein:
the magnetic shield comprises an electromagnet.

11. The apparatus of claim 1 , further comprising:
a gas supply configured to provide the laser gain media to the interior.

12. The apparatus of claim 1 , wherein:
the inner electrode is centered within the interior, and
the plasma pinch is generated centrally within the interior between the inner electrode and an opening through the end of the outer electrode.

13. The apparatus of claim 1 , wherein:
the plasma pinch comprises a flow stabilized z-pinch.

14. A method comprising:
generating a plasma pinch of at least one gas of a laser gain media, by:
generating an electric arc through the laser gain media between an outer electrode in a form of a hollow cylinder and an inner electrode within an interior of the outer electrode, wherein the electric arc travels along an interior surface of the outer electrode towards an end of the outer electrode to generate the plasma pinch; and

generating an output of coherent light utilizing an optical resonator that partially surrounds the laser gain media compressed within the plasma pinch.

15. The method of claim 14 , further comprising:
generating a vacuum within a vacuum chamber that surrounds the outer electrode.

16. The method of claim 15 , wherein:
the inner electrode is centered within the interior; and
generating the plasma pinch further comprises:
generating the plasma pinch centrally within the interior between the inner electrode and an opening through the end of the outer electrode.

17. The method of claim 16 , wherein generating the output of coherent light further comprises:
optically coupling a reflective mirror of the optical resonator with a partially reflective mirror of the optical resonator, wherein the reflective mirror is proximate to the inner electrode and the partially reflective mirror is proximate to the opening; and
reflecting the coherent light back through the plasma pinch to the reflective mirror utilizing the partially reflective mirror to amplify the coherent light.

18. The method of claim 17 , further comprising:
generating a magnetic field proximate to the inner electrode that directs ionized laser gain media away from the reflective mirror.

19. The method of claim 17 , further comprising:
generating a magnetic field proximate to the partially reflective mirror that directs ionized laser gain media away from the partially reflective mirror.

20. An apparatus comprising:
an outer electrode in a form of a hollow cylinder having an end with an opening;
an inner electrode in a form of a hollow cylinder that is centered within an interior of the outer electrode;
at least one gas supply configured to provide a laser gain media to the interior;
a power source electrically coupled to the outer electrode and the inner electrode that is configured to generate an electric arc between the outer electrode and the inner electrode, wherein the electric arc travels along an interior surface of the outer electrode towards the opening to form a plasma pinch between the inner electrode and the opening;
a reflective mirror within the inner electrode;
a partially reflective mirror proximate to the opening that is optically coupled to the reflective mirror;
a first magnetic shield proximate to the reflective mirror that is configured to generate a magnetic field that directs ionized laser gain media away from the reflective mirror; and
a second magnetic shield proximate to the partially reflective mirror that is configured to generate a magnetic field that directs ionized laser gain media away from the partially reflective mirror.

21. The apparatus of claim 20 further comprising:
a vacuum chamber that surrounds the outer electrode; and
a vacuum source configured to generate a vacuum within the vacuum chamber.

22. The apparatus of claim 20 , wherein:
at least one of the first magnetic shield and the second magnetic shield comprises permanent magnetic material.

23. The apparatus of claim 20 , wherein:
at least one of the first magnetic shield and the second magnetic shield comprises an electromagnet.

Assignees

• Boeing Co

Inventors

• Grossnickle James A
• Nikic Dejan

Classifications

• H01S3/036

  Means for obtaining or maintaining the desired gas pressure within the tube, e.g. by gettering, replenishing; Means for circulating the gas, e.g. for equalising the pressure within the tube {(H01S3/031 takes precedence)} · CPC title

• H05H1/06 Primary

  Longitudinal pinch devices · CPC title

• H01S3/0382

  Cathodes or particular adaptations thereof · CPC title

• H01S3/0381

  Anodes or particular adaptations thereof · CPC title

• H01S3/0385

  Shape · CPC title