Method for stripping residual pump light in double-coated optical fiber

Abstract

The invention relates to a method for stripping residual pump light in a double-coated optical fiber, which comprises the steps of: removing an outer coating and a cladding layer of one section of the double-coated optical fiber at the output end of a full optical fiber laser; covering optical gel with high refractive index outside an inner coating of the section of the optical fiber, wherein the refractive index of the optical gel is higher than that of the inner coating of the double-coated optical fiber; leaking light transmitted in the inner coating out through the optical gel, and fully absorbing the leaded pump light with high power by a heat radiating device. The invention has the characteristics of compact structure and convenient integration, and can be applied to a high-power optical fiber laser or high-power optical fiber amplifier.

Description

technical field [0001] The invention relates to a fiber laser and a fiber amplifier, in particular to a method for stripping the remaining pumping light in a double-clad fiber for an all-fiber laser. Background technique [0002] In fiber lasers and fiber amplifiers built from discrete components, dichroic filters are often used to filter out residual pump light. With the expansion of fiber laser applications, all-fiber lasers or amplifiers have become the best way for industrialization and practicality. In all-fiber high-power fiber lasers or amplifiers, the problem of processing the remaining pump light will also be involved, especially in cascade-amplified all-fiber fiber amplifiers, the remaining pump light will be used for the next stage. The coupling devices in the amplification link cause certain damage. Someone proposed to remove the remaining pump light by corroding part of the inner cladding, see ["End-pumped 300W continuous-wave ytterbium dopedall-fiber laser wi...

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Problems solved by technology

In all-fiber high-power fiber lasers or amplifiers, the problem of processing the remaining pump light will also be involved, especially in cascade-amplified all-fiber fiber amplifiers, the remaining pump light will be used for the next stage. Coupling devices in the amplification link cause certain damage

Someone proposed to remove the remaining pump light by corroding part of the inner cladding, see ["End-pumped 300W continuous-wave ytterbium dopedall-fiber laser with master oscillator multistage power amplifiers configuration", Optics Express, Vol.16, 2008, 17864~ 17869], but due to the chemical corrosion method, the operation is more cumbersome

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