Double-ended output linear cavity all-fiber laser oscillator

Abstract

The invention provides a double-ended output linear cavity all-fiber laser oscillator comprising a gain fiber, a backward output fiber grating, a forward output fiber grating, a fiber coupled semiconductor laser, a pump signal combiner, a signal energy transmission fiber, a pump energy transmission fiber, a forward cladding optical filter, a forward output fiber end cap, a backward cladding optical filter and a backward output fiber end cap. The backward output fiber grating, the gain fiber and the forward output fiber grating are connected in turn to form a fiber laser resonant cavity throughthe signal energy transmission fiber. The fiber coupled semiconductor laser outputs pump light to be injected into the pump signal beam combiner through the pump energy transmission fiber and then injected into the fiber laser resonant cavity through the signal energy transmission fiber. The reflectivity of forward and backward fiber gratings is not greater than 95% so that the laser generated bythe resonant cavity can be outputted from both ends of the resonant cavity. The laser outputted from both ends of the fiber laser resonant cavity passes through the forward and backward cladding optical filters and then is outputted by the connected fiber end cap after beam expansion.

Description

technical field [0001] The present invention generally relates to the field of fiber lasers, in particular to a double-end output linear cavity all-fiber laser oscillator. Background technique [0002] Fiber lasers generally include two types of laser oscillators based on single resonator and laser amplifiers based on the main oscillation power amplification structure. Compared with the main oscillation power amplification structure fiber amplifier, the all-fiber laser oscillator has the advantages of low cost, compact structure, simple control logic, stable performance, strong anti-reflection ability, etc., and has a wide range of applications in industrial processing. With the expansion of application fields, all walks of life have higher and higher requirements for laser cost control. At present, in order to ensure the effective start-up of the high-power fiber laser used in the industry, a resonant cavity composed of a high-reflection grating and a low-reflection gratin...

AI Technical Summary

Problems solved by technology

In this structure, since the core of the passive energy transfer fiber does not overlap with the core of the active doped fiber, in order to realize pump injection and signal laser transmission respectively, the two need to be separated in structure. The cladding will inevitably be damaged to a certain extent, making it difficult for this type of laser to withstand high power output above 1 kW

In addition, in this structure, since the core of the passive energy-transfer fiber and the core of the active doped fiber have different axes, a high-power fiber combiner based on double-clad fiber cannot be used, which limits the injection power of the pump laser.

[0005] Among the existing two-way output lasers, one class uses spatially structured optical mirrors and lenses to realize laser reflection and coupling, and its stability is poor due to the need for fine adjustment of the mirrors; the other class uses a dual-core optical fiber structure, pumping Low injection power and limited output laser power

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