Optical fibers for high power applications

Details Optical fibers for high power applications Optical fibers for high power applications

2008-04-08

2008-04-08

Leung, Quyen P (Department: 2874)

Optical waveguides

Optical fiber waveguide with cladding

Reexamination Certificate

active

07356232

ABSTRACT:
The specification describes optical fiber designs that overcome the problem of self-induced damage to optical fibers due to excessive self-focusing. The refractive index of these fiber designs is grossly non-uniform in the center core of the optical fiber. In one embodiment, the optical fiber is designed with a deliberate and steep core trench. In addition, the nominal core region of these optical fibers has a very large area. The combination of these two properties restricts a large portion of the optical power envelope to a core ring, with reduced optical power inside the core ring. These designs substantially reduce self-focusing in the optical fiber. Photonic systems employing optical fibers having these modified core designs are expected to be especially effective for transmitting high power, e.g., greater than 1 MW, with short pulse duration.

REFERENCES:
patent: 5963700 (1999-10-01), Kato et al.
patent: 6018533 (2000-01-01), Krivoshlykov
patent: 7130514 (2006-10-01), Chen et al.
patent: 2004/0247272 (2004-12-01), Dawson et al.
Hadley et al., “Bent-waveguide modeling of large-mode-area, double-clad fibers for high-power lasers” Paper No. 6102-63 Proceedings of the SPIE vol. 6102, Fiber Lasers III: Technology, Systems, and Applications, Published by SPIE (Bellingham, Washington) 2006.

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