All-fiber Structure 980nm Band High Power Fiber Oscillator

Abstract

The invention discloses an all-fiber 980nm high-power optical fiber oscillator in order to solve the problem that the existing 980nm optical fiber oscillator is of low electro-optical efficiency and is restricted in pump light coupling. The all-fiber 980nm high-power optical fiber oscillator is composed of a gain module, two pump modules, two optical fiber mode field adapters, two photosensitive optical fibers, two optical fiber gratings, and an output coupling end. The gain module is composed of a pump coupling module and a double-cladding ytterbium-doped optical fiber. The pump coupling module uses two lateral pump combiners or K multi-mode optical fibers. The two pump modules contain multiple pump sub-modules. Each pump sub-module is a semiconductor laser of which the tail fiber outputs laser of 900-960nm or a beam combiner structure. Each of the two optical fiber mode field adapters can be either an optical fiber mode field adapter or a series structure of sub optical fiber mode field adapters. The center wavelength of the optical fiber gratings inscribed in the photosensitive optical fibers is in the laser band. The problem that the existing 980nm optical fiber oscillator is of low electro-optical efficiency and is restricted in pump light coupling is solved.

Description

technical field [0001] The invention relates to an optical fiber oscillator, in particular to a high-power optical fiber oscillator with an all-fiber structure whose working waveband is near 980nm (970nm-985nm). Background technique [0002] Fiber laser has become the new darling of the laser family due to its excellent heat dissipation characteristics, good beam quality, low production cost, and compact structure, and has attracted widespread attention. With the development of fiber laser technology, the power level continues to increase, and its application fields have gradually expanded from the early fields of optical fiber communication, sensing, and measurement to laser printing, industrial processing, medical treatment, military and other fields. With the continuous expansion of fiber laser applications, the 980nm band laser light source, as an important pump light source for fiber lasers, is also playing an increasingly important role in various application fields of...

AI Technical Summary

Problems solved by technology

By using semiconductor laser direct pumping instead of core pumping structure, the problem of low electro-optical conversion efficiency of the existing fiber oscillator pumping scheme is solved; by using the cladding pumping technology of double-clad fiber, the core pumping is solved The problem faced by the pump is that the coupling of pump light is limited

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