A rare earth doped optical fiber

Abstract

The present invention discloses a rare earth doped optical fiber. The optical fiber includes a doped fiber core, a first quartz cladding, a second quartz cladding and an organic coating cladding from the inside to the outside. The second quartz cladding has a numerical aperture of 0.1-0.24 relative to the first quartz cladding; and the organic coating has a numerical aperture greater than or equal to 0.35 relative to the first quartz cladding. The optical fiber greatly reduce light leakage of the organic coating cladding, is higher in the reliability of long-term working and longer in usage life.

Description

technical field

[0001] The invention belongs to the field of optical fiber laser technology, and more specifically relates to a rare earth-doped optical fiber for lasers. Background technique

[0002] Fiber laser is a kind of laser that uses optical fiber as laser gain medium. By doping different rare earth ions in the fiber quartz matrix, laser output in different bands can be obtained. Fiber lasers have been widely used in industrial processing, medical, military and communication fields due to their high beam quality, large specific surface area, good heat dissipation, high conversion efficiency, small size, compact structure, and easy maintenance.

[0003] In the early days, single-clad rare-earth-doped fibers were used, requiring the pump light to be directly injected into the fiber core. When the pump power gradually increases, it is difficult to further improve the pump light injection efficiency for a fiber core with only a few tens of μm. and power, a certain thick...

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