Ultra high numerical aperture high power optical fiber laser

Details Ultra high numerical aperture high power optical fiber laser Ultra high numerical aperture high power optical fiber laser

1998-03-13

2000-09-05

Ullah, Akm E.

Optical waveguides

Optical fiber waveguide with cladding

Utilizing nonsolid core or cladding

359173, G02B 602

Patent

active

061155268

ABSTRACT:
An optical fiber structure includes: an optical fiber comprising a rare earth doped core (that may be single mode or multi-mode), or several single mode cores, surrounded by a silica material; a glass cylinder tube containing the optical fiber along a length thereof such that the doped core is located at a center of the glass cylinder for a single core, or arranged geometrically around the center for multiple cores; and a support structure disposed between the light guiding section of the optical fiber optical fiber and an inner wall of the tube that functions as a portion of the support structure of the light guiding portion of the optical fiber. The support structure is arranged such that the effective cladding of the core is a gas contained between the optical fiber and the inner wall of the tube for providing the optical fiber with a numerical aperture that is approximately one. A polarization maintaining embodiment is described, as are methods for fabricating the optical fiber structures. To reduce the overall length of the fiber, a chirped Bragg grating may be written into a multi-mode section of the fiber. The optical fiber structures can be used as gain elements in optical fiber lasers, such as those having applications in communications, medical, and manufacturing environments.

REFERENCES:
patent: 5319435 (1994-06-01), Melle et al.
patent: 5367588 (1994-11-01), Hill et al.
patent: 5841797 (1998-11-01), Ventrudo et al.

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