Double-clad upconversion fiber laser

Details Double-clad upconversion fiber laser Double-clad upconversion fiber laser

1994-09-06

1996-06-25

Bovernick, Rodney B.

Coherent light generators

Optical fiber laser

H01S 330

Patent

active

055307094

ABSTRACT:
An upconversion fiber laser with a double-clad fiber is pumped with a laser-diode-based laser pump source, the inner cladding of the fiber forming a low transmission loss waveguide for the pump light. The central core of the fiber is doped with an active lasing ionic species capable of undergoing upconversion excitation, such as certain rare earth ionic species. The use of a double-clad fiber permits the use of high power, high brightness laser diodes, including those with broad emitting apertures, as well as high power diode laser pumped fiber lasers, as the pump source, thereby achieving higher pump intensities within the upconversion laser fiber and improved upconversion efficiency. Pump brightness can be further increased with multiple pump schemes which use multiple pump wavelengths in different absorption bands, multiple pump wavelengths within the same absorption band, pump light from pairs of cross-polarized sources, and pumping from both ends of the fiber.

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D. Piehler et al., "Green laser diode pumped erbium fiber laser"presented at the Compact Blue-Green Lasers conference, Feb. 10-11, Jan. 1994, Salt Lake City, Utah.
W. Lenth et al., "Upconversion Lasers", Optics and Photonics News, Mar. 1992, pp. 8-15.
D. Piehler, "Upconversion process creates compact blue/green lasers", Laser Focus World, Nov. 1993, pp. 95-102.

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